installed the comptech aftercooled setup this past weekend. I feel a noticable difference. However, by boost guage is not reading any positive vacuum. We tried a few different places on the intake manifold but are still getting no positive vacuum. No where near the 4 or 5 lbs that the pulley is rated for.

I can hear the whine of the sc @ low rpm

I can feel a difference, but maybe I'm not getting as much as I should be.

 

Is it a mechanical boost gauge?

 

Mechanical gauge

 

Take the hose off and either blow in it with your mouth or a air line from a air compressor. Need to make sure the gauge works.

 

Tested with two different vacuum gauges.

 

At idle I am at 20 in vacuum

At partial throttle it drops to ten
And then full throttle I am at 0

 

Full throttle at what RPM.. Peak boost doesn't occur until max RPM

 

Even through 9200 rpm I'm not getting any positive.

 

Is the belt tight?

 

Yes. There's very little play