boost gauges
 

hey what is the difference on a boost gauge between vac and psi can i get one with just psi have no clue but want to pick one up tomorrow and put it in thx ............

RE: boost gauges
 

you want one with Vac also.

Vac will tell you how well your car is in vacuum when not accelerating/under boost (which is your psi).
It can tell you if you have a leak under vacuum.

RE: boost gauges
 

A vac/boost guage is only a few dollars more than a boost gauge - well worth the extra $$.

Like brrman said, when you accelerate, you make boost (psi or bar). When you decelerate, you make vacuum (inches Hg).

You could have a leak in either direction.

RE: boost gauges
 

I currently have a vac leak and it is driving me nuts.
I was picking around at the vacuum system last night and found a small crack in a hose leading from my n75 valve.
This morning I can't get any more than 5 psi. LOL - checked the vag on the way to work and realized I didn't plug the
n75 valve back in (N75 open circuit code)

RE: boost gauges
 

oooo ok i get it now i had a feeling that was how it worked im on my way out to get an auto meter as soon as i take a shower ...... hopefully it is a decent one ..... welll thanks guys

RE: boost gauges
 

just get the boost gauge it looks cooler than the vac/boost guage

RE: boost gauges
 

heh heh...easy to say when you don't have a vacuum system.