Im not sure but i think my turbos blown. When i rev up the left turbo makes a screaming sound but theres not a single sign of smoke coming out of the car. When i got new head gaskets is when the problem started. When i dropped it off the were working fine when i picked it up a only had 5 psi of boost and the turbos didnt sound like they were boosting but half way and sounded really quiet. WHen i took it to the dealer they said they didnt know whats wrong with it. Then i drove it the other day and it went from a quiet sound to an extremely loud scream, but like i said still no smoke the engine has 29.000 miles on it. Could it possibly be a wastegate stuck open. Need help fast.

 

if the heads were off theres a few things that could cause it. time to diagnose on your own. could just be a vacumme line off, wastegate stuck oopen, boost lines/pipes leaking, leaking intercooler, blown turbos, when they bolted back up the heads and exhaust manifolds/turbos to the head didnt tighten it but there would be a pretty clear sign of an exhaust leak if that were the case.

 

also, can you check to see if the ECU is tossing any codes. could be running in safe mode if something was left unplugged or has gone bad.

 

But would all that cause the high squeeling noise like sorta metal to metal but not sure sounds just like a blown turbo to me but just no smoke and i find that weird cause every turbo i seen thats blown smokes like craz.

 

Oh and he did mess with the vacuum lines i found some that shouldnt have been there and he just messed it up but would vacuums cause the turbo to make that sound.

 

if the seals are blown it will smoke yes. but if you just get massive shaft play the impeller blades will just gring against the walls and it wont spool. happened to my friend, no smoke. if it sounds like metal on metal then id look towards teh turbo blown option. never got down there, but if you can take off teh intake pipe on the turbo check if there is shaft play and if its tough to spin the blades by hand. when you said high pitched noise it coulda just been a louder turbo sound which could be from a massive boost leak so the turbo is working over time trying to make up for the pressure loss.

 

you should take it up with the people who replaced your head gasket.

 

YEah i tried taking it out with them but the homo said the cars running fine. Personally snwbrderphat540 sounds like hes right cause thats what i was expecting and i thought was wrong with it, but why would the turbo be out at 29,000 miles. Could he of let something like junk get into it and mess it up.

 

they could have dropped something down there, or they could have beat on the car.

sounds like you need to be more serious with the shop. threaten them with a lawsuit if you have to.

 

I'm almost thinking maybe the exhaust manifold may have possibly been not tightened to torque or installed correctly. I remember when my exhaust manifold was leaking due to a broken stud, the manifold would kind of seal up a little after it warmed up, but until then my turbo would scream really loud going under boost.

 

This might sound like a stupid question, but have you checked your belts for tension? As for your low boost. Have you checked your ECU for codes? Have you checked vacuum lines to your waste gate actuators? Z turbos go out fairly often. Mine were replaced at 45k, but before assuming you have a major problem. Be sure all of the simple stuff is ruled out.

 

well i know its not the belts its more of a scream noise then squeeling and the wastegates i took it to nissan and they fixed that problem said a ground wire was touching the posi and blowing the fuse charged 200 bucks for a dang wire to be fixed said it was fixed picked it up still no boost so i brought it home its sitting now starts fine just dont wana mess up anything im thinking possibly the coolant got crimped or something cause the turbo to overheat or something cause the turbos are liquid cooled weird thing is when i did the motor swap the turbos werent liquid cooled so the mechanic was sorta confused about that but i hopw that one guy was right bout possibly a blown gasket on the turbo or manifold that would save money any other possibilities that the problem could be anyone cause im extremely curious no hear anyones response.

 

to hear anyones response i meant

 

wtmf. use some damn punctuation. i dont think i saw a single damn period in that entire post. oh, just one at the very end

and...motor swap? where did this motor come from? do you know what youre talking about?

 

ITs a lot easier not to use punctation even know i majored in that but its still easily understood and yeah i think i know what im talking about i simply said that the old engine turbos were not liquid cooled just oil cooled the new engine turbos are oil and liquid both, is that so hard to understand.

 

ANd if thats all you can say is crap i could care less to hear then y dont you use capitalization.

 

capitalization is not a critical as punctuation when it comes to comprehension. no punctuation, along with shitty grammer and spelling makes posts hard to read.

so you did a motor swap? where did the motor come from? why did you do the swap?

are you talking about z32s, or cars in general? z32 turbos were oil and water cooled, but at some point Garret quit using water cooling.

 

it may be easier for you to not use proper sentence structure, but it makes it downright painful to read your posts. this is a forum, not a text message.

 

I know this probably doesn't help but if your turbos are making noise like that. there are some major issues going on there. Journal bearing seizing, shaft play to the extent that the turbines are scraping the housings. Either way that would mean they are shot.

Our turbos are oil lubricated, and water cooled.

 

Sounds to me like the turbines are scraping the housings. Happened to my first Z. Regardless, I'd say the turbos are shot.