Very High Vaccum?

[maxperformance]

When my foot it off the gas my boost gauge is reading 25 on the vacuum. Is this ok is it normal? I have a Big 16G Turbo ,and stock intake. hhhmmmm~ Any way ot adjust it?

 

[nine5raptor]

thats about what mine is, except it is more like 26-27 in. Hg.

 

[bretthejet26]

im using a different system with my boost controller.. im using bar.. so what would normal vacuum at idle be.. mine is somewhere around -0.5

 

[DSMRevolution]

25in. HG is pretty good on deceleration. I got about 21 before I checked for boost leaks. At idle what do you get? Anywhere from 15-19in. HG is normal. Anything lower, check timing and boost leaks. And for adjusting it... If you want to make it less, then pull a couple vacuum wires. If you want to make it more, check for vacuum leaks.

 

[nine5raptor]

I sit at 21in hg at idle. really this is just a measure of how well the tb seals and if the throttle body to mani gasket is still good.

 

[loreak]

ive always thought my car was pretty high, mines 22-24hg at idle and 28 on decel

sometimes it will go down close to 20-21 if the idle drops fairly low, like 700, usually my car idles around 1000

 

[Defiant]

Weird, this seems to be this week's question. Funny how stuff comes in waves.

 

[Tom Sawyer]

16 at idle and 23 on decel here. As much as leaking can cause vacuum numbers closer to zero, in my experience it appears that there is a degree of variability between cars as well.

Tom