[s-cars] no boost, turbo starts to spool - but goes no farther

[Douglas Fifield]

I have blown the turbo to cross over pipe off twice.  The first time I
could limp home.  The second required a flatbed.

D.

On Sat, Jul 12, 2008 at 7:40 AM, Michael Bess <mlbess at optonline.net> wrote:
> Had the same issue, it was a small split in the turbo to intake manifold
> hose that would allow light boost, but then open up.  It was almost
> impossible to see the split, requiring gentle hand probing.  If a hose
> completely blew off the crossover or intercooler the MAF would generate no
> signal and the car would not run at all.
>
> Mike Bess
> Ex '95 S6 RS-2
>
>
> -----Original Message-----
> From: s-car-list-bounces at audifans.com
> [mailto:s-car-list-bounces at audifans.com] On Behalf Of Fred Munro
> Sent: Saturday, July 12, 2008 6:50 AM
> To: Mike Fitton; sirslurpee2003 at yahoo.com
> Cc: S-CAR-List at audifans.com
> Subject: Re: [s-cars] no boost, turbo starts to spool - but goes no farther
>
> Jake;
>
> Another common cause of this behaviour was the manifold pressure hose to the
> ECU popping off behind the plastic cover on the firewall or at the ECU. This
> happened to me while I was passing a car and it was like hitting a brick
> wall. When the ECU loses the pressure signal it shuts down the turbo and the
> engine goes into "naturally aspirated" mode. This, however, is a condition
> that doesn't cure itself until you put the hose back on.
>
> Regarding Mike's suggestion, I know of one car that had a split in an intake
> hose on the pressure side that would hold boost pressure to a certain point
> and then open up, dumping pressure and boost.
>
> If your car is overboosting, the ECU will shut off boost to protect the
> engine. Is the car chipped? Has the wastegate screw been cranked down? You
> may want to install a boost gauge to see what boost levels you are getting.
>
> HTH
>
> Fred
>
> -----Original Message-----
> From: s-car-list-bounces at audifans.com
> [mailto:s-car-list-bounces at audifans.com]On Behalf Of Mike Fitton
> Sent: July 11, 2008 10:06 PM
> To: sirslurpee2003 at yahoo.com
> Cc: S-CAR-List at audifans.com
> Subject: Re: [s-cars] no boost, turbo starts to spool - but goes no
> farther
>
>
> Sounds almost exactly like a standard intake system leak.  Only thing
> that I find strange is that it halfway repaired itself that one time.
> Look around the intake system for leaks and/or pressure test it for real.
>
> -Cheers!
> Mike
>
> Jake Gaty wrote:
>> I have been having nothing but problems with my Ur-S6, the PO really
> promised me a great running car, but really he was just milking money out of
> me. I was driving on the freeway the other morning passing a car in 5th
> gear - the car started to boost like normal but then when i was parallel
> with the car my boost cut out completely and i was stuck with no power.
> Startled, I got to my destination and turned the car off. When I got back in
> a number of hours later, the car boosted just fine again, for about a pull,
> but then the turbo would spool no longer.
>>
>> the only thing that has changed performance wise in the car was a custom
> exhaust that was put in about 3 weeks ago - consists of a magnaflow Y pipe
> after the cats into 2.5 inch piping to a straight through muffler in the
> rear.
>>
>> I dont think that would be causing any issues but I just thought I might
> put that in there
>>
>>
>>
>>
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>>
>
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-- 
Douglas in MN
95.5 Audi S//6 Avant
73 BMW R60/5 mit Toaster Tank