boost leaking + this noise....

[johndoe1003]

i got a mad noise coming from my car when its on boost, both turbos, dunno what it is.... its boost leaking too as it is running rich and blowing black smoke out the back, and not boosting as it should any ideas? im currently suspecting the aftermarket bov but after second opinions...

Vid

[Guest swiftbrad]

is'nt that compressor surge.

What type of BOV u got?

[johndoe1003]

racepro type s i think?

[wrx_lou]

mine made a similar noise when the turbo shaft bent. Sounded like a kettle whistle and boosted really low.

[BC5RA]

Its not compressor surge.

[johndoe1003]

hmmm, on both turbos?

[subieboy]

 BC5RA said:

Its not compressor surge.

+1 there

[DRFVDR]

no not compressor surge(my rx had that before i fitted a BOV)

I would go back to the original BOV and see if it goes

if it doing it on both turbos I doubt it a stuffed turbo UNLESS it is a toasted primary as i believe that it is still spinning while secondary running

[johndoe1003]

this thing blows little or no blue smoke so unless its chipped a tooth or out of balance? the noise stopped for a bit and started again. would go back to factory but the cars frontmounted, so itl be hard to do haha

[DRFVDR]

ok run no bov or crank the spring down hard just to eliminate that as a cause

check all hose clips

[johndoe1003]

ok, and i blocked the boost guage after the tee just to make sure that wasnt a fault, did the same thing still. ill try crankin the spring down tomorrow and give it a very small run. dont wana do any damage lol

[dubbedup]

sounds like a turbo on the way out

[Guest boostin]

Go through and trace all your hoses. Make sure they're all connected with no splits. I don't think its a turbo. Sounds like a boost leak.

[Swindog]

Mate thats the EXACT SAME noise my turbo made before it popped. Its bent some fins and is rubbing on the compressor housing under load. I wouldnt push it anymore cos youll break a fin off and send it through the system.

Exact same noise.

[johndoe1003]

the car hasnt been driven much since that vid, noise stopped, then started up about 50k ago. has done 300k max since lol as its greenied and ive got another car lined up now. so im just fixing up things like this so it can be sold mint. it started after fiddling with intercooler piping over the secondary so ill have a look

[Guest boostin]

 johndoe1003 said:

it started after fiddling with intercooler piping over the secondary so ill have a look

Should have told us that in the first place!!

[johndoe1003]

i didnt notice it straight away, i was just thinking, about 10 mins into the journey after trying to taker the pipe off then tightening it back on, that noise started. replaced one worn vac line today- no change. thought it was leaking but no

[Swindog]

nothings got thru and damaged a fin has it when you took the pipe off?

[johndoe1003]

havnt checked yet didnt have enough time. tbh it really sounds like a leak, if you accelerate lightly and just get it off vacuum (nearly on boost) then back right off, it makes that noise. which would make me think the pressurised air is leaking somewhere?

[Guest boostin]

Dumb question but both BOV's are connected to the vac lines aye??

[johndoe1003]

yeap i think so....ill take some photos tomorrow. no vac lines have been removed and put back on or anything though so its a problem that has arisen for whatever reason.

[johndoe1003]

fault found! the two bolts holding the intercooler piping onto the secondary turbo were tight, but not tight enough to seal under pressure! so it looked like they were tight but they were far from it. i had no idea how badly it was running till i took it for a run after tightening the bolts. holy crap lol oodles of power again and no cold start hassles!

[wrx_lou]

good to hear it was nothing major.