No boost Stage 3(1 year no problems), this ones confusing.
01-09-2006, 11:45 AM
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No boost Stage 3(1 year no problems), this ones confusing.
Well I my winter car didnt like me anymore so I had to break out the S4 up here in cold a$$ wisconsin. I have been running a MBC on the FULL(everything awe offers) stage 3. I did the install on it, but cant figure this one out.
I have checked all the hoses/wastegate lines/intercooler tubes and I CANT find any boost leak. The car only makes about 1or2 psi now. I can hear the turbo spool DOWN and you cant hear it spool up. Its almost like there isnt enough air for the turbo's.
I have cleared all CEL and disconnected battery thinking it might be some weird sensor and still no luck. So I know its not the boost tubes, wastegate lines, intake plumping, or the MBC(removed it). The car doesnt misfire or anything. Also I notice that there is a little bit more oil reside coming fromt he exhaust @ startup. I usually runa bout 23ish psi, settling @ 21.
Any ideas? Car runs fine, I have all silicone hoses on the intake track.
Thanks
I have checked all the hoses/wastegate lines/intercooler tubes and I CANT find any boost leak. The car only makes about 1or2 psi now. I can hear the turbo spool DOWN and you cant hear it spool up. Its almost like there isnt enough air for the turbo's.
I have cleared all CEL and disconnected battery thinking it might be some weird sensor and still no luck. So I know its not the boost tubes, wastegate lines, intake plumping, or the MBC(removed it). The car doesnt misfire or anything. Also I notice that there is a little bit more oil reside coming fromt he exhaust @ startup. I usually runa bout 23ish psi, settling @ 21.
Any ideas? Car runs fine, I have all silicone hoses on the intake track.
Thanks
01-09-2006, 12:07 PM
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1or2 psi is less than the wastegate spring, so it sounds like there's a boost leak...
after the turbos and before the boost gauge. Even if you didn't want to make any boost, the wastegate springs are set around 4-5psi, so you would still see that much boost before the wastegates opened. If you're only seeing 1-2 psi, it sounds like there's a leak somewhere before the boost gauge sensor.
Is it stumbling at all at idle?
I'd pressure test first, after a visual inspection to see if any IC hoses are off, etc
Is it stumbling at all at idle?
I'd pressure test first, after a visual inspection to see if any IC hoses are off, etc
01-09-2006, 12:10 PM
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If there were that big a leak, would the car still run fine like he states in the last paragraph?
On my S4, I once had a big *** intercooler leak and the car would BARELY start, but would quickly die after a second or two.
01-09-2006, 12:26 PM
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Re: 1or2 psi is less than the wastegate spring, so it sounds like there's a boost leak...
IC hoses are fine...I am going to jack the car up tonight and take a real good look @ it. The car doesn't stumble @ all on idle and it turbo sounds normal on spool down...
thanks for input though. Maybe a crack in my Y pipe? but that would lead to misfiring...
thanks for input though. Maybe a crack in my Y pipe? but that would lead to misfiring...
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01-09-2006, 01:05 PM
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Re: It really depends on how the turbo **** to bed. A turbo can break in a bunch of different ways.
im guessing i am completely screwed. I ran it a little higher in the RPMS to see if it owuld produce any more psi and a cloud of gray smoke came from my exhaust. I dont think the shaft broke and this totally sucks because i bought a house and am completely broke. Any idea, after the year it takes me to pull out the engine and turbos, where I should send them out to get rebuilt. I takes me over 1.5 years to save 1000 bucks. Single home owner isnt cheap