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Vee Dub Nut's 74 Bay Transporter (& Subaru EJ25 Swap)
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Vee Dub Nut
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PostPosted: Thu Feb 06, 2020 10:54 am    Post subject: Re: Vee Dub Nut's 74 Bay Transporter (& Subaru EJ25 Swap) Reply with quote

Figured I'd better pop in here and give an update on this thread. Haven't really done a whole lot to the Bus except drive it (that's how its supposed to be!). I've got something like >6k miles on the swap since it was "finished". Been "done" for a touch over a year (~Nov 2018 I think?). Clearly not a daily drive, but we get out and drive it every chance we get. Tons of smiles and miles so far.

Heater Update: The heater continues to work brilliantly! I've been meaning to get another thermocouple setup mounted and take some temps while cruising down the road. Pretty confident that actual discharge temps are quite a bit warmer when driving around with some load on the engine, than what I initially measured in the garage with just it idling. It will flat cook you right out of the thing. I only ever use the fan on low speed, as it moves PLENTY enough air. I've been out a few times in wet ~30ish degree weather in just a t-shirt comfortable as can be.

Sliding door: I FINALLY tore into my sliding door and went through all the latches, rollers, and slider mechanism. It had always been finicky, but one of those things that never seemed to get to the top of my list. Since its been running so well and I haven't had to do anything else to it, the slider finally crept up to the point where I took one Saturday afternoon to attack it. Pretty simple process, just time consuming. Slider works like brand new again though.

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Link


Front Seats: I've also started in on another small project for the Bus. I'm a pretty tall guy (6'5"), and the stock front seats have always been only marginally comfortable to me. The biggest issue being, once I get the base of the seat far enough back to give me some leg room and make it somewhat easy to get in/out with my right foot & leg past the column, the backrest of the seat ends up being far too vertical for comfort. For this reason (as well as me always keeping the idea of wheel tubs in mind for "someday"), I've kept an eye out for a used set of 914 seats that I could swap in. 914 seats are probably about the thinnest factory style seat your going to find, and being of that mid 70's vintage, still look the part with some basket weave vinyl. My hope has been that the thin backrest would allow me to slide the seat back just a touch more and give me a better backrest feel without feeling like I'm sitting straight up. I managed to pick up a set locally from an old Porsche shop. They need to be re-covered, but the were priced OK, and I could pick them up without having to deal with shipping. I'm just now messing around with how they will fit. Below are a few pics that show the differences in the seat thickness. My plan is to mount them at the same elevation level as the current seat. That ends up putting the seat ~2" higher than the current wheel tub height, so *IF* I decide to go ahead and tub this thing someday, I've got room for them to come up without pushing me up any higher. For now I'll just likely build up some brackets to keep the seat in the same elevation as stock. I'll keep yall posted how this comes together

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Random photo dump: Beyond all that, here are just some other random photos from the past few months.

First up from my deck rebuilding adventure. What do you do when you forgot to order some 16' 2x10's after you've already had the bulk order for the rest of the material delivered to your house? You use the Bus of course! I've got a truck, but its short 6' box was no match for the 16' timbers. The Bus however handled it like a champ. Before the project was finished, I hauled several loads of boards back and forth from the big box store to home, as well as half a dozen 16' wire hog panels for my deck railing. This thing is handier than a swiss army knife!

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Lastly, a sight for sore eyes after a LONG day at work. Drove it in one day a few weeks ago since the weather was going to be extra nice. Thought it would make for a great ride home. Things went sideways at work when I had an engine failure on the dyno, which then kept me there late getting a replacement instrumented and swapped on to not interrupt the next days testing. After pulling into work almost 14hrs earlier, it was sure nice to see the Bus waiting for me in the dark empty parking lot. Still had a nice drive home Cool

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All for now!
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74 Transporter (2.0 T4, SOHC EJ25) - Build Thread: https://www.thesamba.com/vw/forum/viewtopic.php?t=...mp;start=0

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The only cheap part of an aircooled VW sits behind the wheel..
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Vee Dub Nut
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PostPosted: Tue Nov 19, 2019 11:07 am    Post subject: Re: Vee Dub Nut's 74 Bay Transporter (& Subaru EJ25 Swap) Reply with quote

danfromsyr wrote:
that's not really any different than my Astro van operates with it's rear heater.
there's alot of air volume and glass back there.
and if I mix the front heater it's only blows how @ 90-100-red on the temp knob. Astro coolant is ~205*

IMO if your engine coolant temps are @ or below 180*f you're not going to get splendid heat no matter. back in the old days of old cars (with poor/inefficient cooling systems, we'd change the T-stat for winter/summer temps.
but that shouldn't be necessary in these modern car systems.

we don't hear any of these complaints in the vanagon forum re; heater performance on swapped vans, and they have the same long runs to the front..
though the actual core and flow path differences have alot to factor as well.
but it's not because it's a long run and the waterpump can't push it.

my 1980 1.8T swapped vanagon I'll have to open a window because I've never hooked a cable to my coolant valve.. it's either open or closed. but that's some different apples and I don't run @ 180*f


My coolant is certainly sitting right at 180F with the cold weather. That's just where the stock t-stat regulates too given ample cooling from the radiator (regardless of outside temp). So perhaps that is a factor to some extent, but not one I intend to mess with. I'm a big proponent of using the factory subi tstat, as aftermarket ones don't work well on these engines. I also certainly don't want to get into changing tstats with seasonal changes. Just hypothetically speaking, if the coolant temp was running +20F higher around 200F instead of 180F, I would expect to see a pretty similar increase in actual output temperature at the heater too (not 1:1, but quite a large jump).

It would be interesting to me to see actual coolant temp AND flow through the heater core lines under a range of conditions. Not something I intend to mess with, but I do think there are some influences from the t-stat action and engine speed that plays into how much water volume/flow you actually get in the heater loop.

Also, from looking though some of the vanagon info, it seemed to me that how most folks are plumbing in their heaters with are a little different than using the "normal" heater core inlet/outlet on the subi engine. Not sure what impact that might also have too.
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74 Transporter (2.0 T4, SOHC EJ25) - Build Thread: https://www.thesamba.com/vw/forum/viewtopic.php?t=...mp;start=0

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PostPosted: Tue Nov 19, 2019 10:40 am    Post subject: Re: Vee Dub Nut's 74 Bay Transporter (& Subaru EJ25 Swap) Reply with quote

that's not really any different than my Astro van operates with it's rear heater.
there's alot of air volume and glass back there.
and if I mix the front heater it's only blows how @ 90-100-red on the temp knob. Astro coolant is ~205*

IMO if your engine coolant temps are @ or below 180*f you're not going to get splendid heat no matter. back in the old days of old cars (with poor/inefficient cooling systems, we'd change the T-stat for winter/summer temps.
but that shouldn't be necessary in these modern car systems.

we don't hear any of these complaints in the vanagon forum re; heater performance on swapped vans, and they have the same long runs to the front..
though the actual core and flow path differences have alot to factor as well.
but it's not because it's a long run and the waterpump can't push it.

my 1980 1.8T swapped vanagon I'll have to open a window because I've never hooked a cable to my coolant valve.. it's either open or closed. but that's some different apples and I don't run @ 180*f
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Vee Dub Nut
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PostPosted: Tue Nov 19, 2019 10:29 am    Post subject: Re: Vee Dub Nut's 74 Bay Transporter (& Subaru EJ25 Swap) Reply with quote

panel wrote:
What's next for this thing.......power windows Laughing . I love this thing and your updates!


Thanks Panel! No power windows in the works Laughing

Been testing the heater the past few days. Yesterday it seemed to work pretty well, but I never had to back off the valve to knock any heat out of the air. Made me think that maybe output was a little lower than I expected/hoped. So last night I jacked it up and made an adjustment to the cable at the control valve to make 100% sure I was getting it full open. When driving it in again today I was plenty warm, and eventually ended up throttling the valve back to knock some heat out of the air. I also haven't run the fan any higher than low speed, as even at low speed it moves plenty enough air. With where the cable is set right now, I can effectively control the action on the control valve from ~50% to 100% full open. I'll try to improve this in the future to get a better/full range on the valve, but I wanted to make sure I could get it all the way open to test overall capacity, so I really over adjusted it (I have some dead-band on the control now at full open).

I will say that Skills description of "central air" type feeling of warm with a rear mounted heater is pretty accurate. Its comfortable, but not particularly hot in any one area. You don't get that warm air blast feeling like you might in a modern car. If I drop my hand down between the front seats with the heater running, I can certainly feel warm air. It actually feels deceptively cool to some extent, but considering my hand is a good 2-2.5 feet away from the heater outlet, there is plenty of cold air mixing before I can feel it at my hands. If I stretch and reach further back, you can certainly feel more heat as you get near the heater itself. I would like to stick a thermocouple or something there and actually read duct discharge temperature while driving around just to see what it is. Regardless of that actual number though, the heater seems to do just fine making the Bus very comfortable to drive in.

Interestingly, now that I have warm air in the Bus while driving, I can now feel where the drafts and leaks are in the Bus. Never could tell before Laughing Need to probably refresh the seals on the fresh air flapper up front I think, as I'm getting a steady small flow of cold air out of the dash vents even with the lever "closed".

All and all I'll call this a success. If I make any other adjustments to the setup, I'll be sure to post up here!
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74 Transporter (2.0 T4, SOHC EJ25) - Build Thread: https://www.thesamba.com/vw/forum/viewtopic.php?t=...mp;start=0

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The only cheap part of an aircooled VW sits behind the wheel..
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panel
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PostPosted: Sun Nov 17, 2019 9:54 pm    Post subject: Re: Vee Dub Nut's 74 Bay Transporter (& Subaru EJ25 Swap) Reply with quote

What's next for this thing.......power windows Laughing . I love this thing and your updates!
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Vee Dub Nut
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PostPosted: Sun Nov 17, 2019 7:18 pm    Post subject: Re: Vee Dub Nut's 74 Bay Transporter (& Subaru EJ25 Swap) Reply with quote

Did get my install wrapped up this weekend. Took longer than I had expected, but that always seems to be the case with anything in the shop. Every time I get into a project like this, it seems 3 or 4 other little small projects crop up. Its always a "while I'm in here" sort of thing.

I did add a little insulation to my heater core lines before reinstalling the radiator. Will it make any difference? Who knows... But I figure it was only a couple of bucks to do, so it seemed like a no brainer. I only added it on the section of lines over the top of the radiator itself, as I figured I am purposely trying to get air flowing through that area to feed the radiator, so I should at least try and shield that portion of the heater core lines.

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Didn't get any real pics of the wiring, but I ran an 8awg feed through a 30amp circuit breaker from the battery to a small fuse panel mounted under the dash. My intentions were to go ahead and run this now, as I will use it later when I go to power up all the under dash AC stuff next year. I mounted the heaters blower switch to the right of the emergency flasher using one of the factory holes in the dash. It fit up pretty nice, and is easy to reach.

With the install "done", I went about getting the interior all back in it. Had to trim the cargo mat under the seat, but it all fits well. Here you can see how well it tucks up under the seat.

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And for the pièce de résistance... my newly crafted kick panel that hides everything from sight though the open slider. Can't beat that!

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Pretty happy with how that all came together.

After I was done I popped the coolant back in, cracked the bleeders to vent any trapped air, and then fired it up. I always like to leave the system open (i.e. the coolant ball) and get one full heat cycle on the engine to let the t-stat open before I top off the reservoir and cap it all back up. After getting it up to temp I was able to do some tests with the heater. The blower itself is audible, but not terribly loud or annoying. Heater output seems pretty good, at least it feels nice and warm. Oddly, the center duct feels a little hotter than the two outer ones. Not sure why that is.

To try and put some "science" to it, I did some google searching to see what sort of temps it should be putting out. It seems that "normal" acceptable outlet temps at the duct with full heat is 115-120F, with some systems hitting 135-155F. Saw those temperatures referenced on a few pages (including popular mechanics). Right? Wrong? Dunno... I did some measurements on mine just to see, but it's hard to really boil the output down to a single temp, as it is HIGHLY dependent on a lot of factors. From my measurements I saw temps anywhere from ~110-145 just playing around with it in the shop. In general:

**Outlet temp with the fan on low speed is higher than the temp with the fan on high. Makes sense I guess, as coolant flow remains constant, putting more air across the core will reduce the dT of the air

**Outlet temp on all speed settings comes up pretty significantly (~15-20%) with increasing the engine speed off idle. Also makes sense, as this should have a pretty large impact in coolant flow through the core

**Outlet temp of the heater tends to drop off some after the engine is fully warmed and the tstat opens up. My assumption is that you essentially loose some flow through the heater core, as the water pump output now has two paths to flow through, and presumably flow through the radiator shouldn't provide a lot of resistance.

So are my temps lower than it should be??... dunno. Skills seemed to suggest higher temps from some of his work. I'm curious to measure mine further under more "real world" conditions than just sitting idling in the shop. This would probably give me a better idea of what its really capable of. I do think that the current linkage for the heater valve isn't opening it quite all the way, although I did bias it more towards to open end of the valve than the closed end. I also don't know if that valve might be a bit of a restriction too. Not sure what short of cv it actually might have.

Regardless of all that, driving it around today it seems to put out more than enough heat. The control valve is nice too, as I can trim back the coolant flow and knock some heat out of the output. This will help keep us from cooking after knocking the cold out of the Bus. Time will tell I guess...
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67 Beetle (1500sp, 1776dp, 1915NA, 1915T fuel injected, 2276NA, 2276T fuel injected, 2084NA, T4 conversion coming soon!)

74 Transporter (2.0 T4, SOHC EJ25) - Build Thread: https://www.thesamba.com/vw/forum/viewtopic.php?t=...mp;start=0

See all my VW pics on Instagram @ vee_dub_nut

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Vee Dub Nut
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PostPosted: Sun Nov 17, 2019 6:03 pm    Post subject: Re: Vee Dub Nut's 74 Bay Transporter (& Subaru EJ25 Swap) Reply with quote

[email protected] wrote:
i'm sure you know...

the 9" heaters don't have a bias, but the bigger ones (like yours) do have an inlet/outlet on the core. be sure to hook it up right.

your runs are longer than a under seat unit for sure, but not by too much. i'm willing to bet you'll be happy with the heat output of that unit


I didn't realize that about the smaller ones, but I was aware that one I have has the inlet/outlet specified. It's hooked up accordingly.

I'm honestly not real up on the differences in the designs. What is actually different? I *assumed* that the inlet was on the bottom to just better push the the air out of the core. [edit: I suppose this is also dependent on how its mounted. The inlet is on the bottom the way I mounted mine. That orientation just worked better]
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Fightin' Texas Aggie Class of 2006

67 Beetle (1500sp, 1776dp, 1915NA, 1915T fuel injected, 2276NA, 2276T fuel injected, 2084NA, T4 conversion coming soon!)

74 Transporter (2.0 T4, SOHC EJ25) - Build Thread: https://www.thesamba.com/vw/forum/viewtopic.php?t=...mp;start=0

See all my VW pics on Instagram @ vee_dub_nut

Clatter wrote:
The only cheap part of an aircooled VW sits behind the wheel..


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PostPosted: Sat Nov 16, 2019 7:17 am    Post subject: Re: Vee Dub Nut's 74 Bay Transporter (& Subaru EJ25 Swap) Reply with quote

i'm sure you know...

the 9" heaters don't have a bias, but the bigger ones (like yours) do have an inlet/outlet on the core. be sure to hook it up right.

your runs are longer than a under seat unit for sure, but not by too much. i'm willing to bet you'll be happy with the heat output of that unit
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[email protected] wrote:
most VW enthusiasts are stuck in 80's price land.

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Thanks for the correction. I used to be a nice guy, then I ruined it by exposing myself to the public.

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Vee Dub Nut
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PostPosted: Sat Nov 16, 2019 6:54 am    Post subject: Re: Vee Dub Nut's 74 Bay Transporter (& Subaru EJ25 Swap) Reply with quote

[email protected] wrote:
i'm interested to see what that heater puts out. I think the run to the front is won't work well, not the VA setup itself.

by the time I pushed 180* coolant to the front of the bus, it was about 150* at the front core's inlet. rear core was about operating temp.


I'm curious to see how this maradyne unit works too. Being in the middle of the Bus and having longer lines than a rear mounted heater, there is certainly some opportunity for additional heat loss on the lines. Certainly not as bad as a front mounted one, but we'll see.

Regarding the VA deal, I was thinking it, but probably didn't write it in my post. Part of all the one-off work to make something like that actually work (besides just getting it to fit), would likely also be insulating the lines to prevent heat loss, and boosting the flow through the core with a small electric pump to counteract all the line length/restriction your dealing with. I say all that to say, I don't think it's impossible. It would just take a lot more engineering than what is typically thrown at these old things. Not real practical to go down that rabbit hole for me. I've got PLENTY of other things I need/want to do with the Bus before screwing with something like that would bubble to the top of my list.
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74 Transporter (2.0 T4, SOHC EJ25) - Build Thread: https://www.thesamba.com/vw/forum/viewtopic.php?t=...mp;start=0

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Vee Dub Nut
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PostPosted: Sat Nov 16, 2019 6:36 am    Post subject: Re: Vee Dub Nut's 74 Bay Transporter (& Subaru EJ25 Swap) Reply with quote

vwwestyman wrote:
That valve looks like a pretty smooth operator.

I found mine worked much better with a helper spring pulling it back toward the closed position.


Yea, there is a little bit of hysteresis in the cable/valve setup. With it only pulling about 75% travel with the stock VW cable setup, I set it up for approximately 15% to 90% action on the valve. So there should always be a small amount of flow through the core, and almost full on with the lever pulled all the way. I'll start there and see how it goes.
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Fightin' Texas Aggie Class of 2006

67 Beetle (1500sp, 1776dp, 1915NA, 1915T fuel injected, 2276NA, 2276T fuel injected, 2084NA, T4 conversion coming soon!)

74 Transporter (2.0 T4, SOHC EJ25) - Build Thread: https://www.thesamba.com/vw/forum/viewtopic.php?t=...mp;start=0

See all my VW pics on Instagram @ vee_dub_nut

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PostPosted: Fri Nov 15, 2019 9:36 pm    Post subject: Re: Vee Dub Nut's 74 Bay Transporter (& Subaru EJ25 Swap) Reply with quote

i'm interested to see what that heater puts out. I think the run to the front is won't work well, not the VA setup itself.

by the time I pushed 180* coolant to the front of the bus, it was about 150* at the front core's inlet. rear core was about operating temp.

that said ...to danfronsyr….the vanagon guys have an issue with the front heater core design...new ones are in/out without a baffle...so big difference to the maradyne's we run...which I assume are in/out for all intents and purposes.

I feel there is too much heat loss running to the front of the bus...by the time you run the 12' of hose to the front, that leaves a lot of surface to dissipate the heat...in a 'questionable' core.

like I said...it worked...just not epic heat like the rear core. it for sure evened out the heat if you will.

and again, most of my work gets parked come winter but I would like a better solution to a front heater. again, insulating the lines may help a bit, i'm not sure
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my reason for switching to subaru is my german car was turning chinese so i said fuck it and went japanese.......
[email protected] wrote:
most VW enthusiasts are stuck in 80's price land.

Jake Raby wrote:
Thanks for the correction. I used to be a nice guy, then I ruined it by exposing myself to the public.

Brian wrote:
Also the fact that people are agreeing with Skills, it's a turn of events for samba history
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PostPosted: Fri Nov 15, 2019 9:16 pm    Post subject: Re: Vee Dub Nut's 74 Bay Transporter (& Subaru EJ25 Swap) Reply with quote

That valve looks like a pretty smooth operator.

I found mine worked much better with a helper spring pulling it back toward the closed position.
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PostPosted: Fri Nov 15, 2019 9:09 pm    Post subject: Re: Vee Dub Nut's 74 Bay Transporter (& Subaru EJ25 Swap) Reply with quote

Interesting info Skills, thanks for sharing! No worries about muddying up the thread, it's all good info.

I do think it's probably possible to get a combined ac/heat/defrost unit to work, but I'd bet you'd essentially have to gut most of the stuff behind the dash and redo everything one-off. For me, the juice just isn't worth the squeeze. I'm trying to leave most everything EXCEPT the powertrain stock bay Bus. Same reason I haven't done any crazy gauge cluster swap, or some giant double DIN radio, etc (although I do like the skillz subi gauge setup).

Anyways, back to my project. Been continuing to plug away at the heater install. Last night I got all the plumbing completed, and tonight I wrapped up re-installing/re-routing some electrical stuff I had over on the right hand side of the trans where the heater control valve now resides. That's really my only real complaint, is that the right side of the trans is getting busy. I have the starter, stock Bus wiring, fuel pump, pre-filter, main subi-wiring power feed/breaker, coolant suction line, and now heater core lines all in that spot. Its getting tight. Still reasonably OK to work on, but you'd certainly have to work around stuff. Confused Thing is, that's just the natural spot for all those things given the subi engine and stock bus layout. Cest la vie...

Here are a few shots of the heater core fully plumbed from the top side

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Coolant lines themselves routed well. I don't intend to insulate them at this point. Hopefully that doesn't come back to bite me. (PS, I'm a zip tie master Laughing )

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Image may have been reduced in size. Click image to view fullscreen.

Here is the heater control valve I've been referring to. It's a bypassing type valve, meaning when its closed it's "bypassing" the heater core with coolant just returning straight back to the engine (i.e. it flows coolant all the time). However as the valve is opened, coolant will then be diverted up through the core before making its way back to the engine. Its a mixing type valve, meaning I can vary heater core fluid flow from 0 to 100% of the valve. This combined with fan speed on the blower should give me pretty decent control over volume and temperature of the heater air discharge. I picked the valve up from Old Air Products. Its actually just a GM vacuum operated valve with the vacuum pot removed, and this cable bracket attached. Should be on par with OEM level quality parts.

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As for the cable, I just nipped off the last ~12" or so of the heater control tube on that side, and then clamped the factory inner cable to the bracket on the valve. Pretty quick fit up overall. With the stock pull on the cable, I'm only getting about 75% of the valve action. I'll need to tweak the cable attachment to pivot point on either the valve end or the lever under the dash to get a touch more stroke out of it. For now I just split the difference and moved on. Here is a quick video of the valve in action.


Link

That brings us back up to current time. All I have left is to wire up the fan on the heater, pop the radiator back in and fill with coolant, and get the rear mat and seat reinstalled. Hopefully I can knock that stuff out tomorrow and be back back in business.
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vwwestyman
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PostPosted: Thu Nov 14, 2019 8:09 pm    Post subject: Re: Vee Dub Nut's 74 Bay Transporter (& Subaru EJ25 Swap) Reply with quote

I don't know how Skills tried the front heater, but I'm pretty sure that the Vanagon rear heater I'm using in the front of my Bus is smaller than a Vanagon front heater. I'm sure that is a good chunk of the difference you're reporting.

I have insulated my pipes which I think does help at least a little.

I've considered adding a pump to pull water through the cores, but haven't done it. If I would, I'd have it be triggered by the switch under the heater lever.

I also noticed this week I need to swap the thermostat; it is apparently keeping the engine too cool... Saw temps around 165-170 this week tops. No bueno in the winter!
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PostPosted: Thu Nov 14, 2019 7:47 pm    Post subject: Re: Vee Dub Nut's 74 Bay Transporter (& Subaru EJ25 Swap) Reply with quote

Quote:
ching off the rear core helped...but not much. burn your hand at the rear core...front is like a warm beer fart. best temp at front ducts


You need to get the kale out.
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PostPosted: Thu Nov 14, 2019 7:12 pm    Post subject: Re: Vee Dub Nut's 74 Bay Transporter (& Subaru EJ25 Swap) Reply with quote

i'm not going to muddy his thread....

I put a feedback loop like the Subaru needs. it for sure stabilized cold weather temps...a solid 185-190. stock (dealer) t stat.

I can trace the heater output line to the point it just cools down...

pinching off the rear core helped...but not much. burn your hand at the rear core...front is like a warm beer fart. best temp at front ducts was about 150*

it is what it is....I just don't have time to sort a better solution...99% of my clients park them as soon as the salt truck is out.

my cooling system is huge...3.5 gallons (from dead empty) probably closer to 4 with a front core. that is a LOT of coolant to warm up.

in the end, it does seem to help 'equalize' the bus in terms of heat...meaning it's a bit more even if you will, but the rear core is like I tell people...it's like central air in your house...not hot in any one area, just comfortable.

don't get me wrong, the rear heat only works well for most. dumpy buses owners were happy...but I wanted better.

until I see someone with a swap and 190* out of the dash...I call this "myth busted" I did not insulate the hoses...that may have helped a tiny bit.
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PostPosted: Thu Nov 14, 2019 4:16 pm    Post subject: Re: Vee Dub Nut's 74 Bay Transporter (& Subaru EJ25 Swap) Reply with quote

how would a that differ than how a vanagon has the long run to the dash.
plenty of them have plenty of heat, with front & rear heaters.

in my 1980 with a 1.8t swap. so we know it's not the same.. but I can't hold my hand over the dash vents while traveling for more than 20seconds.. and I'm no temp lightweight.

the thermostat controls and maintains a system temperature. with what coolant it has control over.either you have too cool of a T-stat or you are allowing too much return flow uncontrolled (by the t-stat) from the radiator.

iirc and in my opinion your systems run cool. which is fine in summer. but these aren't really frigid temps.. even in the teens. should be plenty of heat..
might want to look at the cooling flow diagram closer something isn't right.

put pipe insulation on the heater core supply line.. then there will be negligible heat loss.

the heat forced chinese heater isn't a bad option in a large bus either.. even gasoline H2o vanagons had them as options. though the Eberspacher option was $$$$ and less popular towards the end.

edit: I agree I don't wish to muddy his thread either, I just don't think it's insurmountable. even if you don't wish to continue it.. love what ya do for these guys.


Last edited by danfromsyr on Thu Nov 14, 2019 7:37 pm; edited 1 time in total
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PostPosted: Thu Nov 14, 2019 2:17 pm    Post subject: Re: Vee Dub Nut's 74 Bay Transporter (& Subaru EJ25 Swap) Reply with quote

it's a long story, and when I have time i'll add more....

I put a front heater in dumpy bus a week or 2 ago. long story short is the juice wasn't worth the squeeze. best could muster is about 120* at the dash. the super long run(s) cooled the coolant down too much.

rear (under seat) heater was still toasty hot. I have come to the conclusion without some serious $$ spent, heating these to todays standards is going to be an expensive challenge

I was so disappointed, I bought one of those chinka china diesel heaters. 220* at the dash vent.

I loosely mounted it (ahem, zip ties) just behind the beam and used the factory duct + routing. the challenge with those is the exhaust...they can't be too long...but vw stuck their belly heater exhaust by the l/r 1/4 window....so i'm torn about how to make good heat up front using the defrost.

I an going to assume the billion dollar vintage air would have performed poorly as well...my inlet coolant temp was 150* on a warmed up (185-90*) engine. it's just too long of a run...
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my reason for switching to subaru is my german car was turning chinese so i said fuck it and went japanese.......
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PostPosted: Thu Nov 14, 2019 11:07 am    Post subject: Re: Vee Dub Nut's 74 Bay Transporter (& Subaru EJ25 Swap) Reply with quote

Now for a non hvac update, I also recently splurged on a new shifter I've been lusting after. Sure its completely impractical and unnecessary, but I've been wanting one for a while, so I finally bit the bullet. Hey, lets be honest, this whole Bus isn't exactly practical Laughing

What I picked up was the Bug-Tech Bus shifter out of the UK. Its all CNC machined aluminum and hand assembled. Its VERY well built. Overall it has a nice substantial feel in the hand and through shifts, and of course shortens the throw quite a bit. Took a bit of time between order and delivery being built to order, but I finally got it and I love it. Obviously a pretty straight forward install (it's just a shifter).

A few pics. Yes you have to cut the mat for the large base, but no deal breaker for me.

Image may have been reduced in size. Click image to view fullscreen.

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Image may have been reduced in size. Click image to view fullscreen.


Certainly not a modification/part that is for everyone, but if you've been interested in one, I'd recommend it. Its a real nice piece, and sort of icing on top of the cake for how well the Bus has come together Cool
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PostPosted: Thu Nov 14, 2019 10:54 am    Post subject: Re: Vee Dub Nut's 74 Bay Transporter (& Subaru EJ25 Swap) Reply with quote

Time for another update...

Finally made some decisions about how to handle heat in the Bus. I explored the combined heat/evap/defrost units pretty extensively, but ultimately opted to go with a separate heat unit. The primary issue was, when I found a combined unit that actually stated it had a decent enough capacity to take on the interior volume size of the Bus, the unit was WAY to big to get behind the dash. Well, get behind the dash without essentially redoing/removing everything behind the dash from about mid way all the way over to the passenger side (i.e. radio, existing ducting, e-brake assembly, etc). It was just going to snowball into more modification/non stock custom stuff than I wanted, so instead I opted to separate the heat and air functions and picked a more traditional marine style heater used by a lot of other swappers (AC will come later using an OG underdash evaporator setup I have).

As for my heat I picked up a 40k BTU marine heater labeled by Summit. Its a Summit rebranded deal, and has a Maradyne sticker right on it. It is a complete heater core and enclosure, with 3ea 3" outlets and a 3 speed fan. To hook it up I grabbed a 20' box of 5/8 silicon heater hose from Vibrant Performance, and a cable operated bypassing heater control valve from Old Air Products.

Looking at mounting location for the heater itself, with the physical size of the larger 40k BTU heater compared to the smaller 2 outlet unit, mounting it up front under the front floor in the belly pan area was not possible. So for interior mounting my two real options were under the rear seat, or the middle one (didn't want it under the dash). A lot of folks go with under the rear seat mounting and I can certainly see why, but after considering the two options, I opted to go with putting it under the middle seat. My Bus being a transporter and used primarily for hauling the family around, I have the middle seat installed ALL THE TIME. It hasn't been removed from the Bus since I installed it 2 years ago. Secondly, the area under my rear seat is already crowded with the swap stuff. I could condense that down and make room, but I like the way its all laid out right now, everything can be easily gotten to without having to remove the seat. Thirdly, I hope that by putting the heater under the middle seat, right in the mid section of the Bus, that I will get the best chance at evenly heating the interior. That's my justification anyways, ymmv.

Here are a few pics of my mocking up the location. Reminds me of those old school Bus heaters under the seat in the back of the Bus as a kid Laughing I'm going to make a trim/kick panel for the seat stand legs like it had originally, which will essentially keep all of the heater out of sight when the slider door is opened.

Image may have been reduced in size. Click image to view fullscreen.

Image may have been reduced in size. Click image to view fullscreen.

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Image may have been reduced in size. Click image to view fullscreen.

Happy with that location, I went ahead and removed all the middle seat, belts, and floor mat to start working on mounting. The heater itself comes with some pretty decent brackets for mounting. Instead of using the supplied sheet metal screws however, I opted to use nut-serts in the floor instead and bolt it down with a small M6 bolt.

Image may have been reduced in size. Click image to view fullscreen.

Image may have been reduced in size. Click image to view fullscreen.

For getting the heater core lines up to it, I had originally hoped to use the large OG center duct hole to route the lines up, but unfortunately its just plain in the wrong spot to be useful. Oh well, instead I picked up some grommets, and popped a couple of holes in the floor for the lines to pass through. Easily patchable in the future if I desire, and the most compact/simple way to get the lines through the floor (I had also looked at some bulkheads for the lines, but they added a lot of complexity, weight, and potential leak points). Upwards and onwards, like a hot knife through butter!

Image may have been reduced in size. Click image to view fullscreen.

Image may have been reduced in size. Click image to view fullscreen.


That pretty well brings us up to current time. Been braving the cold shop each night making small progress each day. Hope to have it wrapped up this weekend. I'll post more as I continue.
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67 Beetle (1500sp, 1776dp, 1915NA, 1915T fuel injected, 2276NA, 2276T fuel injected, 2084NA, T4 conversion coming soon!)

74 Transporter (2.0 T4, SOHC EJ25) - Build Thread: https://www.thesamba.com/vw/forum/viewtopic.php?t=...mp;start=0

See all my VW pics on Instagram @ vee_dub_nut

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