Z-Tuned (Alex)

I had 710N's for a while and I started to hear a blow off sound when letting off the throttle coming from the passenger side of the car (I can distinctly tell it's the passenger side area). So I put the stock 710As back on which are NOT broken but the BOV sound still occurs.

It feels like the car is not pulling as hard as usual, but it could just be in my head. What can cause a BOV sound besides bad BPVs?

Z-Tuned (Alex)

Also, I don't know if i'm making full boost, I will have to hook up a gauge. Would a leak cause it?

Mike@StartupRacing

Sounds like a boost leak.

eigenvector

took my car to mechanics used smoker cant find.. i pressure tested cant find.. it just came back from stage 3-... my vac is 14 and max psi is 14. sigh

mtaesch (Matt T)

when my Throttle Body Boot ripped it sounded very similar to a blow off valve

Nogaro 2.7t

I had the exact same thing and it was my diverter valves

booobS4

i have that sound everytime i step on my gas and then boost a little and let go and it makes a noise

Hogothorpe

BPV = DV

Z-Tuned (Alex)

Where are you hearing the blow off sound? mines passenger side, airbox area stock....

BeeRock::Riding Red

edit: turbo outlet leak? I meant s4 motion, yours sounds like blown dv's mine was like that