Re: Help....urq turbo problems

[quk@isham-research.demon.co.uk (Phil Payne)]

In message <9903221916.AA39056@fluhr.austin.ibm.com> ejfluhr@austin.ibm.com (Fluhr) writes:

> The weekend of March 13th-14th I took the urquattro out to Texas World
> Speedway for the track event.  The car ran great on Saturday, ~1bar of
> boost pressure with fresh Mobil-1, and cold temps for the oil cooler and
> intercooler.  On the 4th track session Sunday morning, however, I
> noticed the boost pressure dropping.  Initially it just dropped to 13psi
> of boost, and I thought perhaps it was heat soak due to the warmer temps
> we were getting.  After a couple of laps, however, I knew something
> was wrong because the boost pressure was dropping a couple of psi every
> time around.  By the time it got around to ~7psi, I noticed some kind of
> whistling/whooshing sound coming from the engine.  My first thought was
> a blown intake hose...no big deal.  However, after taking the intake
> tract apart, I could find no split or loose hoses.

Nevertheless, I think you have one.  Probably one of the thickest -
intercooler to throttle body, perhaps, in which a split is being reset
by vacuum and popping open again only at high boost.

--
 Phil Payne
 Phone: 0385 302803   Fax: 01536 723021
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