I am confused. I got on my car yesterday (Friday the 13th) and all of a sudden the second turbo started to screem like a woman at me. It sounds like a woman screeming Ahhhhhhhh! It only happens after the transition from first to second turbo. According to the PFC it is only getting a total of .62 at max but only about .45 or so on the second turbo. I have had problems with the couplings before but I pulled all of the rubber components that were after the turbo off to inspect them. None of them seem to be cracked. The rear coupling at the top of the y-pipe is silicone but the front one is still rubber but neither of them seem to be the problem. Is there any hoses or vacuum lines that come off the y-pipe on the secondary side that could have popped off and I should check first? I don't know what it could be. One thing that I did notice that makes me think that it could be some sort of vacuum problem is the fact that it usually idles around 380-390 but it is only around 350 now. Does this help? Any help would be appreciated.

 

With a PFC how do you get it to idle that low 380-390 . a vacuum leak gives you more air so if it is rich the idle speed may increase

 

Sorry the vacuum reading used to be 380-390 at idle but now it has dropped to 350 or so. It was late when I wrote it and I was a bit delearious.

 

My car does the same thing. I'm pretty sure that it is b/c my LIM gasket is blown out. The early ones were paper gaskets and are prone to rip or tear and cause a leak.

 

I don't like the thought of the LIM gasket being torn. My engine has been apart twice so they should have replaced the gasket when that was done like 5000 miles ago. Does anybody else have any ideas?

 

If it helps any I don't think it has anything to do with the vacuum. The vacuum was right where it was supposed to be when I drove it around today. Anybody else have any insight?

 

Yes I do have an airpump but would that keep me from getting boost?

 

I think his 2nd turbo might be shot to hell...I know the MKIV site has a supra turbo that does the "whine of death"...and it sounds a lot like a screaming woman. And how come your idle is so low? And are you speaking of your car's idle? If so then 380 is pretty low...

 

To clarify it one more time, the 380-390 was the vacuum at idle and not my idle. If it were the second turbo, do you think it would blow oil? The reason I ask is because when I took all the tubing off the y-pipe was bone dry. The turbos were also completely rebuilt when the engine was put in about 8 or 9 months ago. Thank you all for your help. I am taking it to Rotorsports Racing, where it was rebuilt, on Mon. when they open to get there take on it all.

 

I have pretty much the exact same problem except my boost is more like 10-8-9, I'm starting to believe the secondary turbo is screwed up since I can't find any other cause.

Please let me know if you find a cause (hoping its not the turbo).

 

well, i have this same problem for almost a year now, although I still get full boost, I've fully concluded that my 2nd turbo is making this sound and it's the sound of death (i have 132K on the original turbo...)

 

Just as an update for anybody that searches and finds this thread. I have checked all the intake plumbing as well as the actuator arms for the wastegate and pre-spool to make sure they are still attached. I haven't had the gasket for the LIM or UIM, but I don't feel that this is where the problem lies. It is going in the shop tomorrow and I will post again when we find out where the problem is. I only have about 9,000 miles on the turbos so I am hoping that the solution can be found elsewhere. Thanks for everybodies help so far!

 

The only secondary turbo problems I've ever encountered were when the CCV hose split leaking boost to the atmosphere (boost level will vary depending on what exhaust mods you have done)

And when I split a check valve that runs from the pressure tank on top of the motor in front of the UIM to the Y-pipe.

 

what about a crack in the secondary housing? maybe it's deep enough?

I have no idea, really.. just throwing idea out there

 

Doubtful. Usually the cracks that occur on the FD turbo assy are on the exhaust side. A bad enough crack can cause exhaust gasket leaks, but exhaust leaks leak all the time. Not just when the #2 turbo is online.

If the turbos are really old, & really cracked deep you can have chunks actually fall off into the exhaust stream or into the turbine blades... But since these are recently rebuilt turbos I'm guessing they were inspected for serious cracks of that nature.

 

I just wanted to update this thread in case anyone searches and finds it.

The culprit was my turbo control solenoid. I guess when I took it down the track it just fried the solenoid. It was a pain to diagnose. I spent two weeks tearing the turbo system and hoses apart and I found nothing. Then I had to take it to Rotorsports Racing and after they finally got to it, (rotary shops are getting busy these days), they got to it they took the UIM off and got down to the solenoid rack to find the culprit. I hope this helps anybody that searches and finds this. I want to thank everybody for their help as well.