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Old 03-14-2013, 11:39 AM   #14

GretchenGotGrowl's Avatar
Drives: 11 F150 EB/13 Sonic RS/15 Z06
Join Date: Sep 2010
Location: Little Rock, AR
Posts: 7,133
Originally Posted by sonic656 View Post
Ive never seen a negative number on a boost gauge unless you are dealing with BAR. 15-20inHg is normal for idling in my experiences. I've never heard anyone talk about negative PSI, its always vacuum(inHg).

Sorry for double posting on I figured it would get more traffic over there then here.
My boost gauge shows -PSI when idling and driving until I hit it hard. Remember, they are putting more and more electric stuff on cars so less is driven off vacuum I think. I don't think they have to run the same kind of vaccum they did 10 years ago.
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