On the 9000 Aero it shows 20in Hg.
I just asked my brother, his NG900se shows 20in as well. I assume it would be the same for your Viggen.

 

20 inHG maybe if your coasting down from speed but not at idle.

12inHG to 15inHG if you have AC on and 15inHG to 18inHG with AC off at idle. It'll all vary due to the health of your motor in the end because of wear and tear.

 

my 9k Aero shows 21-22 at idle and pegs the gauge at 30 when off the throttle, in gear, say doing 3k rpms or so. The more interesting part is when it goes to those numbers in the other direction, though =)


Okay, Okay... I only get 25psi, but 30 would be fun...

-Chad

 

my 9k Aero shows 21-22 at idle and pegs the gauge at 30 when off the throttle, in gear, say doing 3k rpms or so. The more interesting part is when it goes to those numbers in the other direction, though =)

Okay, Okay... I only get 25psi, but 30 would be fun...

-Chad

man that is a lot of vac.

 

Nahum, it looks like you have some work to do .

Andrew, what readings are you getting?

 

Eh just my experience with both my motors (a b234 and a b204). If somebody is getting good vacuum like that then hoo-ray. I've just never seen those numbers personally. Unless I was coasting down in gear.

 

Thanks for all the responses. I am getting 20.
Had the wrong hose.

Boost sucks - 7lbs max..but that's for my other thread.

Andrew

 

The higher the altitude the less the vacuum at idle. EXAMPLE, El Paso TX, I only had -13 vacuum at idle and as I drove to Missouri, the vacuum increased as the elevation decreased to sea level. I now have -20 psi at idle.

 

My T5s used to idle at 17-19 Hg (starting at 12-13 on a cold winter morning), coast at 20-22. The T7 I have right now idles at 19-20, coasts at 24.

 

my ng starts up at 10, idles at 12-15 once warm. good thing i've got a new motor to drop in

 

from all my experience automagics have little more vacuum, so keep that in mind. seems most automatics get roughly 1-5 in hg more at idle.

my 99 9-3 5 speed idles once warm at about 15-16 normally, and under deceleration coast about 21

 

My 2000 9-3 5 speed was at about 14-16 at idle.