choinga

I was reading some posts from others about vacuum leaks and such...was curious if there is a range that shows you what good vacuum pressure is on an aftermarket boost gauge?

After my car warmed up today at idle I was at around 15-18.

It would seem that a leak wouldn't neccesarily drop the pressure by a determined amount...guess it would be related to how big the leak is...but just curious if there was a baseline measurement to indicate solid pressure.

MM951

cold I have 10" warm I have 20" at idle and 22-24" on decel

6K miles on engine, all new venturi delete/vac lines/850rpm idle

black944 turbo

It is all over the place, yours seems pretty typical of the ones that I have seen. 15-18 seems ok.

Techno Duck

Warm idle: 18-20''hg
Cold Start: 12-14''hg

This is on a brand new top end,, every hose and line replaced. Anything less than 18'' at warm idle and i would be looking for leaks.

choinga

thanks - i just had the head off (HG replacement) and all new vacuum lines done w/ Lindsey kit.

So far so good I guess. I'm typically closer to 20 than 15 at warm idle (cold idle #'s sound close on my car too...) so I think I'm OK.

theedge

Warm idle ive always gotten 18-21 at sea level.

black944 turbo

I am also well over 3000 feet above sea level, however I have seen many cars that are closer to sea level that are closer to the 15-18 in hg.