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Old 03-14-2013, 12:05 PM   #16

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
Maybe im just out of the loop. I cant even find a boost gauge that shows negative on google. Vacuum sure, negative PSI, nope. Or maybe its alien technology hahaha.

6.5inHG sounds awfully low. Even with not running things off of vacuum a healthy motor still creates it with the throttle closed. I think the numbers are just a placeholder for things to come.
Maybe it is a placeholder and they will change it when a ZR1-like version comes out.

I think you can make any boost gauge show -PSI if you connect the reference tube to something that reads both boost and vaccum. I'm using an AEM TruBoost, so that's pretty common. If you hook it up directly to the turbos then you only read boost. If you hook it up to the manifold it will read both boost and vaccum. We hooked mine up to the manifold because I installed a vacuum pump and it gave me an easy way to adjust the vaccum I was pulling without installing another gauge in my car. Once I got that dialed in I just left it like that.
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