hi guys,

i have similar noise on a friends car and we cant figure out what is it .
please take a look:

http://www.youtube.com/watch?v=jPjFZCIdaUA
thanks

 

What time point in the video is this sound? all I hear is your BOV at the end?

 

Sounds like a boost leak

 

ok I hear it now lol I cant listen to it verry loud at work so I just hooked up my ear buds from my Ipod. Tony is right it deff sounds like a boost leak. check all your couplers for holes and ensure your T-Clamps or what ever you use are tight and your factory/After Market Bov gasket is not leaking or cracked. good luck man

 

I hear a supercharger. :p

 

haha does kinda huh?

 

hi guys.
it dosnt have any boost leaks, it holds up boost perfectly.

wierd,

 

Sounds like a ps pump

 

i changed 3 bov's and its not it too,

 

hmm idk man I would have to hear it in person to know for sure... it only does that under full boost?

 

its a stock d16, the full boost is 10 PSI with a TD04L. the noise starts at 8.5-9 PSI,

thanks

 

oh ok I thought you were talking about the SRT4 in the video?? what bov are you using? your blow off valve my be adjusted tighter I had this problem on the dyno when I was tuning the boost was leaking out the bov I just tightened it up and solved the problem.

 

Your boost gauge does not test for boost leaks. A pressure test does...

 

nah i used the srt video as a sample of the noise.

i also assumed its a bov issue,
the car had a fake type-s and i replaced it with a type-s and then a type-rz

i adjusted all of them so i wont hear air rushing in the charge pipes,

 

who said it is?
I chacked for leaks with compressed air.

 

Next on the list could be your intake manfiold gasket or throttlebody gasket.. Are there any vacuum leaks? I had times when the gasket leak was very minor and the ECU/IACV basically trimmed it out and the car still idled properly and had proper vacuum. But upon boost, it would create a high pitched sound similar to the video.

 

yeah those Type S knock offs suck the construction over all is good but the Diaphragm inside is made of a verry cheap rubber and tears pretty quick. my buddy ran one on his DSM and it ripped after a few pulls down the track haha then the boost just leaked right past the diaphragm. but you said you swapped it for another Bov was it a reputable brand?

 

thanks for the replys guys,

i checked intake vac leaks yestarday with a carb cleaner, i found that the IACV gasket was leaking, i replaced it and nothing changed, i sprayed the whole intake manifold around the tb, fitv, injectors, iat, and couldnt find anything else,

i switched the fake type s to a real type s and the noise was still there and then i replaced to a type rz and determined its not the bov.

my new directions are:
fuel pump/ fuel pressure
or the seal inside the compressor housing,

 

Are you using the gasket in between the BOV and the flange it attaches to? also have you put it in netural and hold the gas down until you build boost on your guage and have someone listen for the sound? just a thought

 

yup. the bov flange is surfaced and has a gasket

 

well **** man idk??? It sounds dangerious but I would just hold the car in boost while your parked and have a buddy listen for the leak or the strange sound..

 

yeah its wierd, its my first time too

i think its the rubber seal that seals the comp housing to the core, its a td04, the compressor is held with a c clamp,

i capped both compressor inlet and outlet and used a vacume gun on the boost line port and it dosnt hold vacume,

well see tommorow,

 

oh it still leaks when you full it up with the compresser?

 

i checked only the charge pipes and intercooler with the air compressor,

the compressor itself i tested with vacume,

 

sounds like the fuel pump is going out. you can go to a dyno and do a pass and check the fuel pressure and see if there's a drop in pressure.