Author Topic: What to do with VNT-15 ?  (Read 2216 times)

May 15, 2005, 08:44:40 am

DieselMonkey

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What to do with VNT-15 ?
« on: May 15, 2005, 08:44:40 am »
Guys,

Just bought a job lot of vw/audi turbo's, ehxuasts, intakes and downpipes from a local breaker for a very reasonable cost.  :)

One of the turbo's is a VNT-15 off a 110bhp TDi and i have the matching manifold. What is necessary to make the variable pitch actuator work on a non- tdi engine ?

Is it worth the work ?  :?

Look forward to thoughts. Regards, DM

Reply #1May 15, 2005, 01:40:16 pm

fspGTD

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What to do with VNT-15 ?
« Reply #1 on: May 15, 2005, 01:40:16 pm »
That's great, and I don't want to damper your enthusiasm, but... I don't think anyone here has tried a VNT on an IDI Diesel configuration at this time, so don't expect anyone to be able to authoritatively answer these questions.

Unless you want to try an experiment yourself, I would recommend holding off, and instead monitoring my "Project Potential... VNT in 1.6 Diesel" thread to see how the results there pan out in the experiment there first.  Once the test results are known, I will report back to the forum with how the experiment panned out, so you and others can benefit and use this information to reach your own conclusions as to whether this is something you may want to try tackling yourself... or not.

Also, FYI: a project like adapting the VNT to go off the ECU control and fit into a chassis it was not originally mounted in, IMO, to do successfully will probably require much more skill, time, and patience than just following instructions and bolting on the factory turbo parts or swapping in a complete factory turbo engine.  The IDI VNT installation will require understanding how everything works, being able to do some custom fabrication, being able and willing to test and diagnose the potential problems that may crop up, etc.

You will not even be able to copy what I did most likely, as the turbo sounds like a different model and also you didn't state what specific engine and chassis you are thinking about installing it in.

I believe it is easy to make a VNT IDI installation perform worse than a factory turbo setup would - or worse - cause damage to the turbo or to your engine, if installed incorrectly.  The small VNT turbos themselves are pretty fragile and can easily be damaged if overspun, as you see happening on some chipped TDIs, etc from what I understand.

And also any custom modificaitons to your engine's oiling system should be taken very seriously and if you value the longevity of your engine and turbo, must be performed flawlessly.  Any oil pressure loss or oil pressure not getting to where it needs to be getting while the engine is running or turbo is spinning, or any major oil leak left unattended for even one test drive, are not acceptable.
Jake Russell
'81 VW Rabbit GTD Autocrosser 1.6lTD, SCCA FSP Class
Dieselicious Turbocharger Upgrade/Rebuild Kits