Hey everyone,

Like the title states - I've been having this very annoying loud squeal since I got it back from the mechanic. See list below as to what they did, just wondering if this is something you have seen before and if it's something I could try to fix myself.

New Fuel Pump
New Primary & Secondary injectors
All new silicone vacuum lines
Bled brakes & clutch
New Ohlins suspension

Please see the attached video - the sound is super loud and appears to be coming from near the turbos. Everything is essentially stock on the car. ~45k miles RHD, Koyo radiator, and just some replaced stock parts like mentioned above.

Edit to add - it only happens once everything is fully warmed up. Temps normally sit between 190-210 depending if I'm moving or not.

https://drive.google.com/file/d/1b92...ew?usp=sharing

Thanks!

 

I'd check the couplers. Sometimes they'll have a hairline crack so small that it's nearly invisible until it's holding pressure. Then it'll leak and make a sound just like that.

An easy way to check is to put a little water on each coupler and look for bubbles when you(r friend) gives it some gas.

 

One way to isolate the source of the noise is with a 3 foot length of old garden hose - hold one end near your ear and carefully move the other end around the engine bay to find the source.

 

Worth a shot - by couplers you mean the intercooler piping right?

 

Yep. The rubber couplers that the intake and intercooler pipes connect with. Pipes too, now that you mention it, since yours are still the stock plastic ones from 30 years ago.

Good luck!

 

It seems when I take it out in the cool mornings it doesn't get a chance to start squealing. I noticed that I don't have full 10lbs of boost when the second turbo kicks in. Does that seem related like whatever is cracked is the source of the noise and boost leak? I get 10lbs on the first turbo, then dips, then settles around only 5lbs on second turbo.. Sometimes its a bit higher, kind of random and doesn't matter if fully hot or just warmed up.. Squeal or no squeal i never make a full 10lbs on 2nd turbo.

Also to confirm my searching it's supposed to be 10lbs - 8lbs @ 4500 - then full 10lbs to redline?

Thanks

 

yep

sounds like a boost leak