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How much vacuum is your car making at idle especially with cams?

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Old Apr 28, 2011, 03:14 PM
  #46  
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comp 280 1000 rpm -20
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Old Apr 29, 2011, 07:02 AM
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i guess it depends on what cams you have installed,, i wonder if installing a vacuum canister would creat more vacuum for sudden braking
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Old Apr 29, 2011, 07:23 AM
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Originally Posted by jrlewis0550
Mine is around -20 psi i think maybe alittle more and my idle is alittle over 1100.
Where are you driving at the bottom of a 5 mile deep mine? Here near see level it is impossible to have a vacuum that exceeds 14.7 psi.
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Old May 1, 2011, 04:33 AM
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it idles at -7psi ,is that normal? mods in sig.
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Old May 1, 2011, 03:06 PM
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I bought my car with the gsc2 cams and at idle it only reads around -7 thru -8ish. I'm assuming I might have a leak tho because after seeing these numbers
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Old Jun 27, 2011, 01:48 PM
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kelford 272s,ported head,1mm oversized valves
1050 rpm , -12 in/hg
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Old Jun 28, 2011, 12:25 AM
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lot of ppl are concerned about their numbers. can anyone explain what a normal and low vacuum number should be and also what does it mean if you have a very low vacuum number? im trying to learn something new here. thanks!!!
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Old Jun 28, 2011, 09:55 AM
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-12 @1100 rpm.

BF272's
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Old Jun 28, 2011, 10:10 AM
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Anyone with GSC S3's and a 2.4L motor. Curious to see some numbers on that combo so I can get a good average (plus I'll have an idea if the spring in BOV is good enough)
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Old Jun 28, 2011, 10:47 AM
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Evo 9 with kelford 272s at 1000 rpm my vacuum is about 10-11
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Old Jun 28, 2011, 11:13 AM
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Evo 9 with Kelford 272s at 1000 rpm....same here vacuum is about 10-11.

Kelfords seem to generate the lowest vacuum. When I'm running the A/C, turning a corner, and depress clutch the car sometimes stalls. I've adjusted the biss without solution. I should get some tuning help to fix it...very annoying.
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Old Jun 28, 2011, 12:21 PM
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Originally Posted by tim85851
anyone?
Mine:

-10 @ 1000rpms - Kelford 272's - Stock motor/valve springs
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Old Jun 28, 2011, 12:53 PM
  #58  
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Yea, I think there are quite a few confused people in here. My car had -19 when it was bone stock so i'm not sure how people are getting -20 with cams.

HKS 264/272 and I get -13~14 with a 1000rpm idle.
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Old Jun 28, 2011, 01:31 PM
  #59  
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269/269 evo ix mr.. Usually get around -11 Hg idle is around 1k
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Old Jun 29, 2011, 12:08 PM
  #60  
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Elevation changes the vacuum as well. Those in Denver will see a different vacuum at idle vs someone being in Seattle.
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