Strange Noise When Boosting N Losing Power

[Buddy]

Yesturday i put a boost controller into my car and am runing it on the normal psi,

its linked to a switch on the dash that i turn on and turns it to 13 psi but when ever i do it now even with normal psi it makes a very loud squeeking sound from the engine bay n i dont no what it is.

It only does it when i am driving but not when i rev it in my drive way, there is also no smell when it does it or when i have stoped

when the noise happens the car looses alot of power and runs pretty rough during hi revs

can some 1 please help

Edited January 14, 2007 by Buddy

[Buddy]

a guy told me that if could be the blow off value leaking cause the spring in it was f**ked which was understandable cause of pressure of 13 psi but i took it off and put a metal plate inplace but still does exactly the same noise and power loss

[shnaped_second]

Turbo has come loose of the manifold, check everything surrounding the turbo

[Buddy]

Are u sure thats the problem or could something else be wrong?

Just so i can tell some1 what might be wrong

Edited January 14, 2007 by Buddy

[NICKS33]

noone can tell u what the problem is without seeing the car mate...theres a few things that could be wrong...could have a boost leak..check ur cooler piping or like the first guy said it could be that ur turbo gasket is screaming cos the turbos come loose...anyone else with ideas??

[Buddy]

wouldn't i be able to smell exhurst from the engine bay cause its leaking or hear when its leaking??

[MBS206]

When the gaskets leak, they make a high pitch noise, normally when they'er being revved under load (Accelerating up the street)

It's normally a small hole, that if on an N/A car, wouldn't make an issue, as it's easier for the gasses to flow out the exhaust pipe normally, but on a turbo car, a small pressure build up occurs between motor and turbo, hence, it forces it's way out the whole.

Could also be the boost controller is broken. Have you returned the boost controller set up back to stock to try that?

[Buddy]

i made it my self with a mate its very simple and i can see it affecting the car

[T04GTR]

yes. your turbo to manifold bolts are loose. nip them up soon. opr the gasket will be finnished

[Buddy]

is it easy to get to or do i have to get some1 that knows what they are doing to do it

[Buddy]

do u mean this part that could be lose? cause i have tried every bolt around there and i cant move any i have also checked every intercooler connection for holes and even spayed carbi cleaner on it at idle to see if it done anything

Edited January 18, 2007 by Buddy

[4core]

My brothers old turbo (on his silvia @ 15psi) made some terrible squealing noises under full boost, when he got it serviced they found that the fins on the compressor wheel had bent back and the air was not getting through properly into the housing.

It was more like someone with a external gate when it was squealing...

Hope this helps?

[(B1) MR_fanny]

exhaust manifold bolts broken/loose as well as turbo gaskets are the obvious things. had same noise under boost, but i could still hear it when reving not under load. was initially an exhaust leak from the turbo dump but it came back after a while. had my exhaust manifold bolts and all gaskets replaced from that and the turbo and now the noise is gone.

[Buddy]

but in the picture i posted is that where u guys are talknig about or a different place