(Diesel) Mechanical VNT Turbo Vane Control

[Ibuprofen]

Libby/Waldo, do you still have the photos somewhere? If so, do you mind reposting them? http://imgur.com/ works pretty well.

Thank you!
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Filbert: 85 Westy, 1.9 AHU mTDI, LR 300 pump stock fueling, 520 nozzles.

[Bill B]

thank you so much for the response Merry Christmas !

[Paulbeard]

See the post of Nov 23 in this thread:
https://www.thesamba.com/vw/forum/viewtopic.php?t=677288
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Currently -> Frida: 87 Tizian Red (mostly) Vanagon GL Westfalia w/ 2.0L ABA conversion
Formerly -> Steward of a 73 Super Beetle (Beater) and 67 Beetle 1300 (Little Max) both names by POs

[Bill B]

cant seem to find any photos working, is there anywhere i can find them? i am trying to mtdi my eurovan and would love to have a vnt turbo

[avocado_tom]

Thanks!!!

[?Waldo?]

The posts are past the time limit for editing and so I cannot fix the links.

Here are some concept drawing for a similar but alternate version:

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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.

[avocado_tom]

Any possibility of these photos being restored?

Or is there somewhere else they live?

Much obliged!

[?Waldo?]

You can use the stock vacuum can, but need to turn it into a boost can and fit it will an appropriate spring or the boost curve might not be desirable. Prothe sells new TDI vacuum actuators made in China for about $45 shipped on eBay. As mentioned previously, I used one that came with my turbo, sliced off the crimp with a grinder and drilled the eight tiny holes around the rim and screwed it back together with mini nuts/bolts from the hardware store.

For the spring on that control I actually used trial and error with my collection I've gradually accumulated over the years. That said, you can measure the size and calculate the spring rate and amount of pre-compression necessary for the desired max boost and order from places like McMaster. That particular boost can diaphragm has an area of 5.3 sq-in. Given that the can has 0.5" range of motion and to start regulating at 10 psi and have vanes full open at 15 psi at max pedal position then you would need a pre-compression of 53 lbs (area 5.3 sq. in. x 10 psi = 53 p) and then the spring rate would need to be 26.5 pounds per inch (53 p x 0.5 in range of motion). Given that the fully compressed length would be say 3/8" then the total spring length would need to be 3/8" (fully compressed length) + 1/2" (rod travel) + 2" (pre-compression of 53 lbs) = 2-7/8" length and 26.5 lbs per inch rate with the ability to compress to 3/8". You can also have two springs and size them so one is inside the other in order to get the desired pressures but the math can get more complicated.

Calculating the lever arm lengths (attachment points of the heim joints) is also a bit of a process that I will describe in the future when I have more time.
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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.

[jackbombay]

[a914622]

Sweet . I think i just scored a vnt-17, so the build is on. Now i need to find a vacuum can in figure the linkage.

Oh yea an intercooler too.

jcl
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87 gl powerd buy 2.5subaru
75 914 getting 2.2t subaru scratch that SVX subaru

[Syncroincity]

Perfect, thanks!

I found a guy on TDIclub that does the flanges, with or without an expansion cone; username "Whitbread"... Matt Whitbread he runs a VW fab shop in Lima Ohio. Beautiful work. The flanges are about $40.

http://forums.tdiclub.com/showthread.php?t=247135

I'm tempted to just ship the mani & turbo off to him, or make a roadtrip once I get the beast on the street... I'm running the T2 for the time being until after break-in.
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'86 Syncro CHC Top AAZ Turbodiesel
'04 Passat Variant 4Mo 5MT

Vanagon Build: http://www.thesamba.com/vw/forum/viewtopic.php?t=466866&highlight=

[?Waldo?]

I don't know of anyone selling pre-made flanges. Let me know if you come across someone. I've had to make my own.

I have some of the older pictures, but wonder if they wouldn't just add confusion rather than clarity. Here are some concept diagrams to assist in easy understanding of how the control works.

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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.

[Syncroincity]

I was hoping you'd put this up here.

I just scored a brand-new VNT-15, the Euro version with no manifold... it has the inverted (vs. an AAZ, anyway) triangular exhaust interface. I have the earlier trapezoid manifold, I'll have to work out an adapter.

Does someone sell a prefab VNT exhaust outlet flange for custom pipe work?

Do you have the photos of the earlier incarnation that had been on VWD.net? Some of those were great for grasping the concepts here, particularly the hollow tube & spring arrangement for the boost can vs. fuel lever compensation.
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'86 Syncro CHC Top AAZ Turbodiesel
'04 Passat Variant 4Mo 5MT

Vanagon Build: http://www.thesamba.com/vw/forum/viewtopic.php?t=466866&highlight=

[?Waldo?]

I've considered it but am currently more than busy enough. Maybe in the future. A big hurdle is that the typical VNT 15 seen in the U.S. severely interferes with the driver's side aluminum mounting bracket. I used a Euro VNT 15 wit a custom adapter to the stock 1.6TD exhaust manifold. Those turbos are harder to source in the US. The typical US VNT with integral exhaust manifold would require a custom driver's side engine mounting bracket as well. The whole package with turbo would be quite expensive. Then again, the low-rpm performance improvement is priceless.
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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.

[markd89]

I think you'd have a market if you decided to produce a kit

[rmcd]

Do you know if anyone sells a turbo, manifold and pump setup or should I just resolve myself to following Andrew's lead and building my own?

Anyone had any experience with fin-turbo.fi?
TIA.

[a914622]

I was using a TDI grind- 1.6 hydrolic head. It added a lot of bottom end tork.
Im working on putting together anouther engine with ported head, total seal rings and ARPs all around. Im going to keep an eye on this because im thinking this turbo is the final part Iv been looking for.

jcl
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87 gl powerd buy 2.5subaru
75 914 getting 2.2t subaru scratch that SVX subaru

[xoo00oox]

Nice work. I know you put tons of time in this project, I had enjoyed watching it on vwdiesel. I have a few spare VNT's here and will use what I have learned from your posts when I get a chance to put them on something.

[?Waldo?]

I don't have any decent fuel economy numbers. I've been running taller tires and so the speedo and odo are off. I haven't had a chance to find out how far off they are.
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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.

[Vanagonner]

True genius- as simple as possible, and beautifully executed. I also appreciate that you are doing this on the 1.6. Not many people understand that it is a great engine in it's own way. And with no smoke! Please let us know what kind of fuel economy you get with it as you go. Congrats on a successful outcome from your persistent efforts.
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Sage
'82 Westy 1.6 D
the mighty n/a