Vacuum and Boost Pressure

[Benag]

I've done some searching but I wanted to try and make it specific so I know I'm running right. I have vaccum pressure at idle at about 19 psi and on decceleration at 22 psi. Is this normal? Also what is the normal boost max at stock?
Thanks a lot.

 

[ddavisaf]

Your vacuum is perfect. Boost is around 10ish give or take 2 psi.

 

[Benag]

Awesome. Yea I think my boost is at 12 at max. Thanks man.

 

[justin0469]

im just wondering, what boost gauge do you use? ive only seen gauges that show vaccum in mm/hg. or did you just convert it

 

[Benag]

Oh my bad, I meant 19 mm/hg. And it is an Autometer Sport Comp boost gauge I believe.

 

[justin0469]

normal idle vacuum is like 700mm/hg (somethin like that) or 19psi

 

[Flavor-DSM]

Would a boost leak cause a bad vac at idle? Mine is only like 12-13 mm/hg, and I'm pretty sure I have a boost leak because I get a cut at 4500-5000 RPM at WOT on a stock system..

 

[justin0469]

yes it would. check out www.vfaq.dsm.org under intake to learn how to make an intake leak tester.

 

[Benag]

Oh yea, what I meant to say earlier was 19 in/Hg.