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vacuum at idle

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Old Nov 22, 2008 | 11:53 AM
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evremonde
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From: south jersey
vacuum at idle
I tried searching a bit but could not find anything conclusive.


How much vacuum (hg/in) should a stock evo 8 read at idle?
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Old Nov 22, 2008 | 12:02 PM
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From: Hudson, NH
Around 20 in/Hg
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Old Nov 26, 2008 | 10:39 AM
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From: south jersey
great, thank you
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Old Nov 26, 2008 | 03:06 PM
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From: sc
Originally Posted by partyboy1122
Around 20 in/Hg
It's that high? I thought it was around 17" with stock cams
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Old Nov 26, 2008 | 05:07 PM
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From: Luke AFB
I've got 17-18 at idle on my IX
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Old Nov 26, 2008 | 05:09 PM
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From: kingston,ny
17 to 20 is spec for almost every factory engine.
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Old Nov 26, 2008 | 05:20 PM
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From: Hampton, Virginia
i have 18-19 with mods in my sig
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Old Nov 26, 2008 | 08:45 PM
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With my digital boost gauge it is around 18 Hg/in during idle warm'd up. Now if your decelerating in gear then its at around 19-23 depending on different factors.
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Old Nov 27, 2008 | 03:45 AM
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My IX idles at about 12" when warm according to my truboost. I have M2 cams.
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Old Nov 27, 2008 | 05:21 AM
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~20 on a stock car but once you alter the idle rpm and or install cams it can be vastly different. I see ~5psi or 10 inches of mercury
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