Hi iv just signed up, being meaning to do it for a while but this has been my first chance to get on.
I have a problem with my 92 wrx impreza. Tonight it has just destroyed its 3rd turbo after only a few miles.
I fitted a new braided line made by Pirtek for me as i knew that the originals can get kinked etc when bending them as i thought it was due to an oil feed problem that killed the first one. But the second turbo failed after only 40miles and the 3rd one lasted about 60miles before it has started to make the same horrible sound and no boost.
I have checked the coolant pipes and have the new oil line and all seems ok that way, what else can destroy my turbo's so fast?
Only mods are walbro, pipercross air filter, blitz BOV and MBC but its only set for 0.7bar at the moment.
Please help, i dont my fourth turbo to be the same. I have been priming all the turbo's before install and run fine at first, but after a bit of driving they fail.

Cheers Aj

 

Destroyed in what way ??

Tight/binding compressor shaft ?
Compressor wheel rubbing on the housing?
Compressor wheel/Turbine wheel damage ?
Siezed Solid ?
Oil drain restricted ?
Correct oil feed banjo bolt ?

Mick

 

I get a horrible grating noise coming from the turbo when accelerating. The first turbo snapped the shaft, the second one after 40miles had massive play and the third one is still on the car at present but im guessing the shaft has play again, neither of them did before fitting.
The oil feed and fittings are brand new and made for me by pirtek in braided hose. This was fitted to the current third turbo as i thought the original had gotten kinked and restricted flow thus destroying the 2nd turbo but now the third has failed aswell.

Cheers Aj

 

If the oil supply hose is all well and good as you say now, there has to be a problem with the return restricting or preventing circulation through the turbo.
Other than that, possibly an overspeed problem, have you a boost gauge fitted, so you can see actual pressure achieved? I know you say the mbc is set at 0.7 but if there is a problem with the wastegate or pipework it could go way beyond. Are you using the same wastegate when swapping turbo's?

 

Low oil pressure most probably. Do you have an oil pressure gauge? The light on the dashboard is not a good indication of oil pressure, it switches off at an extremely low pressure.

My advice is, measure your oil pressure IMMEDIATELY, if it's low, then strip and rebuild the engine/replace oil pump before you spin a rod bearing.