Ok after I installed my OCC, I noticed my vac pressure running around 18 at idle with the AC on, if I turn the AC off it goes to 19 -20. I know at idle it is supposed to be 20. Is this okay and me just being paranoid, or should I check for a leak. I know that its close enough to 20 but I just want to make sure.

 

with my mods mine runs at about 18-19 vac at idle.. i don't think theres anything to be worried about unless your getting a significant difference in vac

 

Same here. Mine's always at 18-19. It IS a good idea to check those hose clamps on the OCC on a regular basis, though....

Dusty

 

Ok, thanks guys. Yea I have been checking my OCC and hoses about once a week. Thanks for the help.

 

my is past 20... it usually varies from 22 to like 28 but its always diff on the weather and the only thing i got was a cai and a bov

 

At idle vac is less than atmospheric pressure, which is 17-21mmHg

When you let off the gas it WILL go higher than 21mmHg