Turbo Problem And Question!

[boliztik]

hey,i have a 32 gtst with an rb25, every time i slow down from boost i get white smoke that puffs out from the exhaust (fair bit)

none on idle or anything only slowing down. from what i know its probly a blown oil seal on the turbo... correct? if so whats a rough price for new seals with labour?

engine specs: standard rb25 turbo running 10 psi, 3 inch no cat, microtec, ebc, 040 fuely etc

also i have a brand new garrett t04 sitting around, would it be better to fit this? i have boch 040 fuel pump but standurd injectors, once again would like a rough price from ur experiance.

sorry to ramble on...

cheers dylan

[The Dan]

Don't discount valve stem seals. You need to perform tests to determine which is the cause of your problem.

Remove the turbo and manifold and do a vacuum test on the exhaust ports to determine the condition of the valve stem seals. If they come up ok, then you need to examine the turbo.

I'm not about to go into depth into how you should do this as you won't even have the tools or equipment to test the valve stem seals anyway.

Good luck

[boliztik]

plz dont say that

[The Dan]

sorry mate, it's a harsh reality. Valve stem seals are more likely to leak at negative cylinder pressure as the vacuum effect draws oil through the stem seals. They can weap at idle also but it slowly gets burnt away and not so noticable. On decel, the cylinder draws oil past the stem seal and because you have no real combustion until you resume accel, it will become quite noticeable at this point.

Could still be your turbo but would hate to see you replace it and have the same problem without checking it properly first.

[tridentt150v]

3lit3 is correct, but decel will vacuum suck oil in from a few places, even up past the oil control rings in the bore [although rings usually also smoke after an idle period then accel].

I think you need to determine if the white smoke is oil or water/coolant as well, this could help you determine where to look.

[boliztik]

allrite but i still have all power and no hickups in motor, only when i decel from boost i realy hope its the turbo, noticed its got a bit of a high pitch squeal and smoke dose smell bit like oil i rekon.

cheers for the replys!