hearing the bov at 10Hg?
 

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

Re:hearing the bov at 10Hg?
 

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 ???

Re:hearing the bov at 10Hg?
 

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.

Re:hearing the bov at 10Hg?
 

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

Stan

Re:hearing the bov at 10Hg?
 

yea you will hear it a little pretty much any time you lift, since there is obviously more air in there than would be without the turbo even with vacuum in the mani, so it releases that when you lift

Re:hearing the bov at 10Hg?
 

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