been trying to solve a problem with the cossy over the last few weeks ive got a squeel that is getting louder over the last few days.It sounds like a ballloon when you let the air out and the sound only comes at around 15psi when in high boost ? seems to be coming from the passenger side swapped most things dump valve ,checked hoses,isv valve car runs spot on bar this noise

any thoughts on the problem ???

 

could be the turbo making metal/metal contact, with the engine off, how much end float is there in the turbo shaft, is it like a d1ck up a shirt sleeve..?

other favouite is a split house that is only opening up under boost and letting a small amount of air leak, maybe inlet manifold gasget..

a good way to find leaks is to have the engine running, and geta can of carb cleaner. spray around all the joints , hoses, manifolds etc and see if the engine revs up, if it does, youve found the leak

 

could be a long shot but have you checked the blades on your turbo?
a nick on one of the can cause this...

 

boost leak of some sort i would say, have you checked all the hoses????

 

inlet manifold gasket???

 

there is a slight bit in the turbo but sounds like its from the other side ,also the car pulls perfect on low boost at about 15psi but soon as you switch high boost 24psi the noise starts you can make the noise come and go by feathering in the power (over 15psi) checked hoses etc does not tick over perfect but would you not haer a air leak on tick over ??

 

try the carb cleaner

 

the turbo can still work perfectly & be out of balance m8
worth checking for air leaks though first, standard inlet mainifold gaskets are crap & regulary blow out. try changing these to a comectic if u haven't already. check all the hoses inc the small vac 1's esp the rigid plastic 1's to the map sensor & fpr.
then get it sorted so u & nick can entertain me on a wet track

 

just what i wasgoning to say, had one go on a rs turbo the other day sounded just like what your describing

 

its a pain in the arse ian been at nicks at the weekend change in over parts still no look only thing not changed is the map sensor so giong to give that a try

 

what rsdene as the boost increases the noise got louder ?

 

have u got an air line?
if so get a plastic aerosol lid that fits nicely in the intake hose before the turbo & screw an airline fiiting in the centre. then u can pressurise your entire intake system & find a leak if any
u could also adapt one of those hand pump pressure sprayers from the garden centre.
I'm still betting on your turbo being out of balance though. is it the original 1 from when the engine let go? if so it may have suffered oil starvation. ps it can still be out of balance & have no play, noise only appears once the turbo gets past a certain rpm hence why u can hear it a high boost

 

i know what your saying makes sence Ian but Russ was in the car and seems sure its not turbo but if it is then so be it will have to get it sorted

 

the noise does not apear at a certain RPM it is bang on 15 psi of boost ??

 

turbo rpm not engine rpm

 

yep thats it mate, inlet gasket fook'd