Screeching noise on boost - please help!
#1
Scooby Newbie
Thread Starter
Screeching noise on boost - please help!
Hi everyone,
I'm at an impasse with my 2006 Spec D WRX STi 2.5. Since I've had it, it has created a loud scream when on boost, (no it's not the passenger, I gagged them to make sure).
Research initially pointed to an up-pipe gasket, but the noise only happens on boost and the pitch and volume does not change with engine revs so I don't think it's that. Performance seems unaffected and ECU is telling me boost pressure is around 18psi give or take.
Things I've changed:
Can anyone shed any light or offer any advice on what to check next please?
I'm at an impasse with my 2006 Spec D WRX STi 2.5. Since I've had it, it has created a loud scream when on boost, (no it's not the passenger, I gagged them to make sure).
Research initially pointed to an up-pipe gasket, but the noise only happens on boost and the pitch and volume does not change with engine revs so I don't think it's that. Performance seems unaffected and ECU is telling me boost pressure is around 18psi give or take.
Things I've changed:
- Inlet pipe - new Samco
- All vacuum lines - new
- New BOV
- New inlet manifold gaskets and bolts
- New TGV valve spacer gaskets and bolts
- Had the complete inlet assembly off, checked and re-assembled
- TMIC pressure tested fine
Can anyone shed any light or offer any advice on what to check next please?
#4
Scooby Regular
The turbo outlet to intercooler elbow have been know to get chewed up by the OEM (perforated type) jubilee clip and leak.
#6
Scooby Regular
Any type of valves/restrictor pill in old pipes taken off/replaced that were not put back in maybe?
#7
Scooby Newbie
Thread Starter
The thinking now is that it's not on the cold side, it's the up-pipe gasket leaking from back pressure when the turbo is at full spool. Great, PITA job...
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#8
Scooby Regular
iTrader: (1)
I had something that sounds similar to what you're describing... With mine it was the gasket between the turbo and downpipe, basically one of the 5 studs/nuts was missing/chewed up... it looked like the nuts had been reused at some point. To cure it was a new downpipe gasket, studs and nuts. Unfortunately still a pita job...
Hope it helps,
Chris.
Hope it helps,
Chris.
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09 July 2003 03:31 PM