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outwesty
Samba Member
Joined: June 06, 2006
Posts: 1078
Location: Northern Sierras
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 Posted: Mon Sep 30, 2013 1:11 pm Post subject: |
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| jimeg wrote: |
Thanks outwesty. I am still acquainting myself with my AAZ install, but I believe everything is mechanical so I can't chip mine. How are you sourcing your AHU's? |
AAZ's can be made to put out some decent power but not as much as an AHU can being direct injection. I've owned six 97-98 jetta TDI's. Last summer someone was texting and almost hit us head on. I swerved off the road but he still hit us so now I have another good AHU. I bought the car back from the insurance co for $400. They are out there. We still use one with large injectors and a chip as a daily driver. My record tank is 755 miles on one fill up driving like Grandma. It's a great engine. |
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hans j
Samba Member
Joined: May 06, 2006
Posts: 2745
Location: Salt Lake City UT
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| Posted: Mon Sep 30, 2013 1:45 pm Post subject: |
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As Jon mentioned, I have an ALH TDI with stock gearing in my syncro and 27" (215/75-15 BFG) tires. I usually run about 3200-3300 RPM on the freeway going 63ish MPH and get 27MPGish.
I had the engine balanced before I built it and it will get up to 70MPH but I don't like taking it there. Next year is my trans rebuild time, but I have put over 5000 miles on the stock trans gearing. Just don't plan on getting anywhere in a hurry and you won't mind.
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1986 Canadian Syncro Westy TDI - 1989 Syncro Single Cab - 2001 Audi S4 - 1981 VW Caddy ABA - 1980 VW Caddy EV - 1973 VW T-181 |
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?Waldo?
Samba Member
Joined: February 22, 2006
Posts: 10124
Location: Where?
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| Posted: Mon Sep 30, 2013 6:00 pm Post subject: |
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| outwesty wrote: |
| jimeg wrote: |
Thanks outwesty. I am still acquainting myself with my AAZ install, but I believe everything is mechanical so I can't chip mine. How are you sourcing your AHU's? |
AAZ's can be made to put out some decent power but not as much as an AHU can being direct injection. |
The AHU will put out higher torque figures in the lower rpms but the AAZ has the ability to rev higher. All else equal (intercooler, appropriate turbo, appropriate fueling), the AAZs ability to rev higher results in higher horsepower. Granted, that higher HP comes at the cost of significantly increased fuel consumption. The AAZ was seriously de-tuned from the factory (no intercooler, lower boost pressure, pathetically little on-boost fuel, etc...) and I believe the reason was mostly to create that very misconception that the direct injection results in more power.
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I am a high-functioning autistic into VW diesels and Vanagons along with other things that are unrelated to this site. |
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jimeg
Samba Member
Joined: May 14, 2007
Posts: 510
Location: PNW
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| Posted: Mon Sep 30, 2013 7:28 pm Post subject: |
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| Witless Joe wrote: |
| jimeg wrote: |
| I am still acquainting myself with my AAZ install, but I believe everything is mechanical so I can't chip mine. |
Even if it's not "chipable", you can make some useful mods to the injection pump of an AAZ engine.
Here's a place where you can start to get a few ideas (translated from French a bit roughly):
http://www.vwdiesel.net/forum/index.php?topic=579.0 |
Thanks for the link. I've had a few very late nights studying that site - lots of really good info. Im pretty excited about going diesel in a Vanagon. Hopefully this engine turns out to be in the condition I was told it was in. I would be interested in making performance improvements to the motor, as long as they don't compromise the the longevity and too much of the efficiency. Im used to 15mpg from my last two Van's, so improving on that should be easy. Once I get everything cleaned up and organized I plan to post an inquiry here and at VWD for tuning and installation recommendations - as well as continue to spend countless hours on the search button.
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1986 Root Beer Syncro Tin Top....so many plans.
Here: http://www.thesamba.com/vw/forum/viewtopic.php?t=578490 |
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regis101
Samba Member
Joined: July 28, 2005
Posts: 2078
Location: Livermore, Ca
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| Posted: Mon Oct 07, 2013 5:31 pm Post subject: |
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Chiming in here, seeking info.
If going with the 3-4 swap and maybe a R&P change, how does that effect the 1-2 and 2-3 shift point(s).
Does anyone have a new transaxle like from Weddle or something?
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Peace, ~R |
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Jon_slider
Samba Member
Joined: April 11, 2007
Posts: 5091
Location: Santa Cruz, Crowdifornia
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| Posted: Wed Oct 09, 2013 4:07 pm Post subject: |
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> If going with the 3-4 swap and maybe a R&P change, how does that effect the 1-2 and 2-3 shift point(s).
here are some general observations Ive made after driving a Tdi powered Syncro Westy with 3 different tire sizes, 3 different gearing combinations, and 2 different Ring and Pinions.
1. The BEST configuration, great power on all shifts between all gears, great crawling, great highway acceleration and cruising, low EGT at 70mph. Excellent in every way except offroad ground clearance.
215x75x15 tires, 27.8" diameter BFG AT Ko (close equivalent to 215x70x16)
4.86 Ring and Pinion (I call that "stock")
1.08 3rd, .7 4th
2. The WORST configuration, lagged from a stop because tires made gearing too tall, huge lag and shift gap reaching 4th from 3rd, and ran hotter at 70mph. Bad in every way.
30x9.5x15 tires, 29.5" diameter BFG AT Ko (close equivalent to 225x75x16)
4.86 Ring and Pinion
1.14 3rd, .7 4th
for my needs, on pavement, keeping up with traffic as a daily driver including on the freeway, the 1.08 has the RIGHT gearing for going 45-55mph on hills
the 1.14 is TOO SHORT for that speed range, leading to terrible drivability.
a .7 4th gear does not work well on a hill at 45-55mph. The purpose of a .7 4th is for cruising on the highway at 70mph
I absolutely LOVE the 1.08 and would never do a 1.14 again.
next lets look at the shift gap between changed 3rd and 4th gears
stock 2nd, 1.14 3rd and a .7 4th
the gearing gap from 2nd to 3d is 7% wider than stock
the gearing gap from 3rd to 4th is 11% wider than stock
stock 2nd, 1.08 3rd and a .7 4th
the gearing gap from 2nd to 3rd is 11% wider than stock
the gearing gap from 3rd to 4th is 7% wider than stock
as you can see, you are basically choosing where to put the 11% gap and where to put the 7% gap, either between 2nd and 3rd, or between 3rd and 4th.
In my experience, the 11% gap placed between 2nd and 3rd, and the 7% gap between 3rd and 4th is more practical.
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My Soapboxes: Inflation; Handling; Gearing; Decoupling; Swepco |
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outwesty
Samba Member
Joined: June 06, 2006
Posts: 1078
Location: Northern Sierras
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| Posted: Wed Oct 09, 2013 4:36 pm Post subject: |
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| Great info Slider. I am running 225 75 16 Wrangler Duratracs on my syncro after the TDI drops in. I think I will try a 1.08 3rd & 0.77 4th with this diamater. |
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Jon_slider
Samba Member
Joined: April 11, 2007
Posts: 5091
Location: Santa Cruz, Crowdifornia
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| Posted: Wed Oct 09, 2013 5:00 pm Post subject: |
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| outwesty wrote: |
| Great info Slider. I am running 225 75 16 Wrangler Duratracs on my syncro after the TDI drops in. I think I will try a 1.08 3rd & 0.77 4th with this diamater. |
I do not recommend the 1.08 3rd for your tire and ring and pinion combination
A syncro with 29"+ tires that has stock 4.86 Ring and Pinions is my least favorite combination offroad, it makes granny a bit too fast to crawl
imo IF you plan to keep the 4.86 Ring and Pinions, you should stay with 28" tires. That way your granny gear will crawl slow, like it should.
if you do go to the 225x75x16 with a 4.86 and a .77 4th, you should use a 1.14 3rd
the 1.14 and the .77 go well together
the 1.08 and the .7 go well together
a 4.86 goes well with a 28" tire and
a 5.43 goes will with a 29"
If you go to 29" tire but stay at 4.86 R&P, use a 1.14 and .77
but imo, if you really want to run a 225x75x16, you should bite the bullet and change the ring and pinions.
I may know of a syncro front diff with 5.43 R&P for sale. if you need one pm me and I will give you the contact
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My Soapboxes: Inflation; Handling; Gearing; Decoupling; Swepco |
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regis101
Samba Member
Joined: July 28, 2005
Posts: 2078
Location: Livermore, Ca
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| Posted: Wed Oct 09, 2013 5:24 pm Post subject: |
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Hmm. Excellent. I'm glad I asked.
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Peace, ~R |
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