germ

quick questions.....

i recently have been through a couple tranny's (automatic's) and put on a on a high stall torque converter (4000 rpm!) when i replaced the stock tranny.

well anyway, as soon as i put on the converter there happens to be a VERY LOUD "whine" whenever i give it a good amount of throttle and the sound fluctuates with the rpm but it only does it under heavy accelration but NOT EVERY time, but i would say 80% of the time this happens.

i chalked it up as a bad tranny and put in another newer one (3rd tranny) with about 20k miles on it and it still does it.

so i was thinking MAYBE turbo? but it never did it until i put the converter on and replaced the tranny a couple times.


has ANYONE had anything similar occur with the turbo making a good awful whine sound?

it almost sounds like a supercharger but 100x louder.

FooK

dustin had this problem, i think.

turned out to have chips and stuff in his compressor wheel and the turbo was done.

91dxcrx

mabye its your wastegate :P

seriously though, id check out the turbo like **** said.

germ

brand new Tial Sport 38mm 9 psi, pretty sure thats not it.


it could possibly be the turbo, but the only things i have changed is the tranny and torque converter. i replaced the tranny thinking that that was the problem because i had just put it in, so i put in newer one that worked flawlessly before it was removed from the donor car. so i know its not the tranny.

and the turbo was fine before the first tranny swap, it does have a couple very small "nicks" in the blades, but they have been there for a LONG time.

and it doesnt sound like a whistle sound which is what i would think it would be if it were the turbo fins and it would do it all the time wouldnt it?

chinoy

Had the same problem.
On one car it turned out to be the compresor wheel touching the housing.
On another it turned out to be a small air leak. That got really loud as the boost climbed. Look for an air leak. in the hosing.

germ

well, the wheel does have some bit of play up/down/side but not in/out.

so it COULD be that.

i have been wanting to replace the center housing or just the whole damn turbo alltogether.

but last time i checked, the shaft play was minimal and didnt the wheel didnt touch the housing, but it could be as it spins.


but it doesnt do it all the time, just most of the time.

as for the loudness, its the same "loudness" everytime, the actual sound itself changes as the rpms go up/down and only under hard acceleration.


and the housing is sealed, no leaks.

chinoy

Sorry to say this but the only way your going to know for sure is pulling the turbo and looking for scratches where the wheel may have touched.
Grabing the wheel and checking at 0 RPM is one thing when she spins up its another.
The leak can be anywhere. From the compresor outlet to the manifold.
Easy way to chk. Cover the inlet with your hand engine should die. Any leak and you will hear it.

germ

no visual signs, but its kinda hard to shove my head down into my engine bay, lol


and the car does stumble/dies if i put my hand on the inlet of the compressor.

AgentMurdoc

my dads car does that. his turbo has shaft play like a ****.

germ

well, im pretty sure it was the high stall torgue converter.

i removed it last night and put the stock one back on and all is well.



i also looked at the turbo inlet and there was one minor scratch on the inlet portion. took my dremel and cleaned it up but nothing major done to it.



pulls hard and no more funny whine sound.