Turbo/boost Problem?

[4DoorStyle]

hey guys, i tried a search but nothing specific came up.

When my car starts to come onto boost it makes a hell loud airy noise and sounds really bad, not from the motor or anything, just the turbo, it used to have a really nice spooling noise but now it just sounds dodgy and is only boosting to about half of what it usually does.

Wats happened is my standard turbo failed and i needed one asap so i brought a kkr480 because it basically fell into my lap, so i got that put on with some custom braided lines etc..

So the turbo has probably done about 5000kms and about 3000kms of that was from my step dad who drives like a granny.

The turbo has been good until yesterday when it started doing this... i thought it might be a turbo gasket as it felt a bit like when my 180sx done a gasket but the turbo is basically new and it has a metal gasket so i cant see it being that.

Then i thought it might be loosing pressure somewhere in the induction side of things but i cant find a leak... no hoses have blown off...

now i know most of you guys think these turbo's are crap and your probably right but i was hoping some of you may have experienced something like this so i can fix it until i get a new turbo again...

any help would be great, cheers

Edited June 30, 2007 by 4DoorStyle

[zebra]

Yes it does sound like a manifold/turbo gasket.

but i would check that a cooler hose hasnt split, can be hard to see as it may only open up under boost. or it could just be a loose hose clamp and its leaking around that.

I'd double check them all again, but pull them all off and squeeze them so if there is a split you will be able to see them.

Andrew

[4DoorStyle]

thanks zebra, the manifold gasket was replaced when the new turbo was put on. the car isnt louder from the exhaust but when its supposed to spool, it just goes sssssssssssssshhhhhhhhhhhhhhhhhhhhhhhhhhh and does nothing.

[Baconer]

Hey im having a similar problem to this, it spools and sounds normal until it hits boost and then that really loud airy sound starts (ssssssssssshhhhhhhhhhhhhhhh as 4door described ), car makes very little power aswell when this happens. Car is a stock R33 GTST with HKS High Power Silent and BATMBL split dump and cat and the problem only occurred about 2 weeks after the exhaust was installed. Its not the gasket between the turbo and exhaust as this was a new metal gasket with a fair bit of gasket cement so where would be a good place to start looking for split pipes or leaks.

Thanks,

Alex

Edited August 19, 2007 by Baconer

[sky_2.0T]

Hey im having a similar problem to this, it spools and sounds normal until it hits boost and then that really loud airy sound starts (ssssssssssshhhhhhhhhhhhhhhh as 4door described ), car makes very little power aswell when this happens. Car is a stock R33 GTST with HKS High Power Silent and BATMBL split dump and cat and the problem only occurred about 2 weeks after the exhaust was installed. Its not the gasket between the turbo and exhaust as this was a new metal gasket with a fair bit of gasket cement so where would be a good place to start looking for split pipes or leaks.

Thanks,

Alex

wastegate stuck open?

[Baconer]

ok i'll have to take the dump pipe off again then and have a look, why would this of happened 2 weeks after the install though?