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Old 05-07-2002, 03:02 PM   #1
Scooby Specialist
Member#: 4667
Join Date: Mar 2001
Location: Asheville, NC
2002 WRX
Black (well kinda)

Default Update on P5 Turbo

Again, thanks for everyones help.
Don't know if anyone cares, but my brother found the source of the problem.
After we talked for a while about problems with MAFs, he went to inspect his. To his suprise, his air filter had completely folded in on itself and clogged the intake.
Now, instant boost!!! No stumbling!!!
He says the car can break traction in first gear just getting on it. Those P5s are really lightweight.

Jewbaru and I talked for a while yesterday and also discovered that he has the vacum source for the FMU coming from before the TB. He hasn't fixed this yet (hard head) but other than that it seems to be running great now. Thanks jewbaru!

Next problem: Oil in the intake pipes!!! He has a brand new T25, but we both are coming to the conclusion that the seals are bad. Anymore suggestions?
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Old 05-07-2002, 03:18 PM   #2
Scooby Specialist
Member#: 8488
Join Date: Jul 2001
Location: Sin City
1993 Impreza GCStyle


Oil in the intake is relatively normal in a boosted car. High RPM, full boost gives you a bit of valve float and you'll start smoking out the head.

The fix: An oil catch can that's higher or equal to the valve cover.

93 1.8T
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Old 05-07-2002, 03:19 PM   #3
Scooby Specialist
Member#: 1994
Join Date: Jul 2000
Location: "Teh Hebro Town"
2013 Impreza WRX


Oil in the intake is caused by a few things:

Bad piston rings, causing blow by,
Over filling the oil pan,
Bad oil return from the turbo,
the Turbo sucking oil into the intake from the breather hoses,
maybe a bad turbo (they usually dump in the exhaust too, and he'd see blue smoke).
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