robmclean8

Hi there,

Thanks in advance for any help.

Got a 2001 Wrx which started making a tyre screeching noise today at high boost. The boost is set at 1.0 ish so it's not very high.

The boost kind of whistles up to this mark and then screeches near the top.

Is this normal? I've not noticed it before but don't really push it to be honest.

It may not be the boost, just what it seems like, any help is greatly appreciated.

Many thanks

Rob

ScoobyNoob79

Boost leak. Check all the hoses.

Fudgey

iTrader: (1)

Or worn bearings in the turbo allowing the compressor wheel to touch the housing

robmclean8

Thanks for the replies. Hoping its just a boost leak. How would I check to see if the turbo bearings are the cause ?

richie001

iTrader: (3)

Wonder if its a aftermarket dump valve ?

That's if you got one that is

robmclean8

Thanks Richie, no just had the dump valve changed back to a stock one a few weeks ago,
Does that eliminate the dump valve ?

Fudgey

iTrader: (1)

You will need to take intake hose off which is a pain, if its catching you should be able to see it as it ill have polished the housing/ visible wear to blades.

Also check for in/out play on the shaft, a little up/down movement is normal but not much

richie001

iTrader: (3)

Yeah mate,Mine makes what i would call a screeching noise.Was told it the GFB dump valve fitted by the previous owner.

Fudgey

iTrader: (1)

Did you use a new gasket? Ould be leaking at higher boost

robmclean8

Thanks Fudgey, no it was not new, just off another one. I drove it for about 2 weeks before this issue and was driving it quite hard today before the screech started to come in.

robmclean8

Just a quick add, there doesn't seem to be any change in power during the screech,
still pulls like a train.

Robsscooby

iTrader: (1)

Mine leaked from dumpvalve gasket after changing it
Cost me £7 for new gasket from import cars