I installed my boost gauge yesterday and my boost readings seem to be fine. Spikes/holds 18 psi in the midrange and slowly falls to 16 psi by 7k rpms or so.

However, I only see about 14 in if Hg at idle where I'm used to seeing 20 or so in other cars consistently. Is this correct or do I have a vac leak somewhere? On decel, I can get it as slow as ~19-20 in/Hg.

 

Mine idels around 17 in/hg, which I think is pretty typical for EVO's.

Where did you tap the boost line at?

 

20

 

my vac. reading is 19

 

20

 

about 17 at idle, 19-20 on decel

 

Normally .20 but somtimes depending on the weather it will idle at .15-.17 . I think you are fine just get a boost controller and crank up the powaaaa But ya you are ok I doubt there is a leak.

 

Idle I think is 17-18.

 

15-drops to 12 somtimes cause of my cams

 

14 at idle..I think we have the same boost gauge

 

I have the Stewart Warner Boost gauge. Do you have the same thing?

My vac signal is the soft vac line on top of the valve cover that feeds the diverter valve.

 

40 to 45 kg/cm depends on the weather

 

I just walked in from installing my new boost gauge, and was getting ready to tap out exactly the same question! SPOOKY!.

 

Newb question for you guys:

What does 19-20 in/Hg mean? And what levels should you expect to see idling, accelerating, shifting, then say standard highway driving? What would the gauge do if you were experiencing leakage?

-Thanks

 

Idle: 17-18 Hg
Decel: 20-21 Hg

dividedsky: When driving I am hardly ever in positive boost unless I am excelerating.....on the highway mostly around 5Hg to 2psi depending on landscape. If there was a leak in your boost lines, trust me, you would know it