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Drivetrain What Vacuum should I be, at idle?

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Old 07-24-2007, 04:13 PM
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What Vacuum should I be, at idle?
I'm thinking my car has a slight vacuum leak because my car still turns off when I come to a stop light with the A/C on.
My boost gauge reads 10-12 for vaccum but my E55 Benz reads 20 at idle. I was wondering if the Mini should also be at around 20? I need your help guys.
Thanks
Mario
 
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Old 07-24-2007, 04:18 PM
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mine idles about 18, which seems to be the consensus in other threads ive read
 
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Old 07-24-2007, 04:23 PM
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Hey Mario...There was a software update for the AC turning off the car when idling. At least thats what fixed mine. I was only aware of it on the older cars like mine. 10-12 psi vacuum doesn't seem like a leak to me.....
 
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Old 07-24-2007, 04:25 PM
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Wonder if mine is ok. I'm at 12-14 at idle. But my car hasn't turned off.
 
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Old 07-24-2007, 05:59 PM
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mario ; i asked the same thing a while back . was told around 15 was fine . i'm at 15 but the sound is way different under the hood . put a webb head on it . does a head change change the sound at idle to a phsssssssssshhhh . like heavy sc sound . don't wanna steal your issue; just curious.
 
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Old 07-24-2007, 07:43 PM
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I see 16 with the ac off and 12-11 with ac on.
 
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Old 07-24-2007, 07:44 PM
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oh sorry i misread the original post "with air conditioning on", i believe mine with air co on sits at about 12 or so, my bad
 
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Old 07-24-2007, 08:02 PM
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Around 11 in/hg at idle here.
 
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Old 07-24-2007, 10:03 PM
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I forgot to mention I have the Fireballed head, and the Detroit byPass valve. Today I looked and I have 11in/hg with no A/C at idle and stopped. I have 21in/HG with no A/C and coasting to the red light in neutral.
Normal?
 
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Old 07-25-2007, 06:40 AM
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Originally Posted by MarioKart
I forgot to mention I have the Fireballed head, and the Detroit byPass valve. Today I looked and I have 11in/hg with no A/C at idle and stopped. I have 21in/HG with no A/C and coasting to the red light in neutral.
Normal?
Coasting with the trans engaged will give an inaccurate reading.
Was the trans engaged?
 
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Old 07-25-2007, 08:54 AM
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Originally Posted by obehave
Coasting with the trans engaged will give an inaccurate reading.
Was the trans engaged?
not sure if the trans was in gear but the clutch was pushed in. I will check at lunch.
M
 
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2013 GP2 #295, 270whp/310wtq, KO4 47mm Turbo, 18" NM Wheels, Alta intake, Manic Stage III+, HFS-3 Meth, 30% E85 Blend, Forged IC, Alta Hot Pipe, P&P/Ceramic Exhaust Manifold, m3 Extreme Ceramic DP, Vibrant mid res, 4" Double walled Tips, WMW/KW V3 CO, Alta Rear CA, CREE Fogs, Black out F/R Rings and Gas Cap, M7 CF Front Splitter, and No Stickers. MORE TO COME!! Previous 04Triple Black 17% Alta, MM Air/H2O, CAI, OBX Header, FBT Head, Shrick Cam, 234whp
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Old 07-25-2007, 09:05 AM
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Do you have a cam in there? The cam will lower it by a few inches HG.

Mine with stock = 16-18" at idle
Mine with Shrick race = 10-12" at idle.
 
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Old 07-25-2007, 09:09 AM
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Originally Posted by TampaMCS
Do you have a cam in there? The cam will lower it by a few inches HG.

Mine with stock = 16-18" at idle
Mine with Shrick race = 10-12" at idle.
yes I do have a Shrick cam and my idle was raised 75rpm over stock with software.
 
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2013 GP2 #295, 270whp/310wtq, KO4 47mm Turbo, 18" NM Wheels, Alta intake, Manic Stage III+, HFS-3 Meth, 30% E85 Blend, Forged IC, Alta Hot Pipe, P&P/Ceramic Exhaust Manifold, m3 Extreme Ceramic DP, Vibrant mid res, 4" Double walled Tips, WMW/KW V3 CO, Alta Rear CA, CREE Fogs, Black out F/R Rings and Gas Cap, M7 CF Front Splitter, and No Stickers. MORE TO COME!! Previous 04Triple Black 17% Alta, MM Air/H2O, CAI, OBX Header, FBT Head, Shrick Cam, 234whp
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Old 07-25-2007, 10:04 AM
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Originally Posted by MarioKart
not sure if the trans was in gear but the clutch was pushed in. I will check at lunch.
M
Cool. Didn't want things to get confused.
Last time I checked at 875RPM idle I was at ~18"Hg.
Stock head/cam, intake, exhaust manifold.
HDI Intake, 15% and Magnaflow exhaust.

PS: No AC
 
Last edited by obehave; 07-25-2007 at 10:36 AM.
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Old 07-25-2007, 10:08 AM
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I get 16 at idle with a/c off; 12 with a/c on.
 
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