I'm hearing my blow off valve going off when I let off. According to the boost gauge it's going off at 10Hg. Is my gauge fucked, or maybe is it the nylon line?

Stan

 

it was a brand new gauge, i doubt it's fucked, vdo, might be ugly, but they're pretty good. how is your line ran? pull it and check for kinks, or just replace it with regular vacuum hose, you could also have a vacuum leak some where affecting your readings

 

there can be boost in the charge pipes even if there's vacuum in the manifold. the throttle butterfly is a restrictor, thus pressure on the turbo side when only partially open WILL be higher than pressure on intake valve side. this is very common with small turbos where partial throttle is enough to spool them.

 

Ahh, that makes sense. But even at 10InHg with a .60/.63 t3?

Stan

 

i hear mine a little when in close to 10hg.. under a small load too (about 35-40% throttle) if i let off of it i hear it a little bit