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You guys with a VAC/BOOST gauge... what vac are you seeing at idle?

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Old 04-24-2008, 12:19 AM
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Question You guys with a VAC/BOOST gauge... what vac are you seeing at idle?
Just curious... I dont think my boost gauge is working correctly and would like to know what is "normal"? I know all cars will be different.. but what is yours showing for VAC at idle?

Thanks.
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Old 04-24-2008, 12:30 AM
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I see about 20 lbs of vaccum at idle.. dont know if its good or bad! but thats what I see..
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Old 04-24-2008, 12:43 AM
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I see close to the same as stated above, between 15 and 20 at idle
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Old 04-24-2008, 12:45 AM
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Right now Im seeing 11-12 in/hg at idle.

Stock LS1, 6.0L heads, blower cam 221/227 580s 114... D1SC.

Well.. while Im here I might as well ask....

Setting my AFPR... do I set base FP w/o the vac hooked up? So at 0psi its a true 58psi?
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Old 04-24-2008, 01:02 AM
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Originally Posted by Avengeance
Right now Im seeing 11-12 in/hg at idle.

Stock LS1, 6.0L heads, blower cam 221/227 580s 114... D1SC.

Well.. while Im here I might as well ask....

Setting my AFPR... do I set base FP w/o the vac hooked up? So at 0psi its a true 58psi?
yes

vac at idle will depend mainly on cam size. with a small cam I am seein 18-19 in/hg at idle.
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Old 04-24-2008, 01:13 AM
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21-22inches here
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Old 04-24-2008, 01:14 AM
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9in-lbs

BIG cam lol
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Old 04-24-2008, 01:21 AM
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Thanks guys...

I dont consider my cam big... 221/227 .588/.575 114lsa. I know its registering more then 10".... maybe its 13".
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Old 04-24-2008, 02:04 AM
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Originally Posted by ninetres
9in-lbs

BIG cam lol
Don't feel bad I'm at 7-8". LOL!
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Old 04-24-2008, 08:01 AM
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15 at idle
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Old 04-24-2008, 08:14 AM
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i was seeing 20
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Old 04-24-2008, 08:22 AM
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18 at the moment
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Old 04-24-2008, 08:23 AM
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with a stock motor, stock cam & stock heads I see about 22-24 inches of vac
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Old 04-24-2008, 08:40 AM
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With my 347 9.35:1 with speed inc SC2 cam (224/232 .581/.595 114) AFR 225 72cc heads I get around 12-15 in/Hg at idle. When cruising on the highway it often goes to 20 in/Hg.
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Old 04-24-2008, 09:13 AM
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there is no magic answer to this question...it depends on mods, cam, your altitude.

just remember what it is now and take that as normal unless you have a leak
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Old 04-24-2008, 09:15 AM
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I am seeing about 8 to 9. Big *** cam

Keith
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Old 04-24-2008, 09:31 AM
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Originally Posted by MECHAM
there is no magic answer to this question...it depends on mods, cam, your altitude.

just remember what it is now and take that as normal unless you have a leak
Thats kind of what I figured. I thought mine was a little low but I suppose with a cam and 6.0L heads its possibly normal?
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Old 04-24-2008, 11:03 AM
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18-20 hg for me @ 800 RPM idle
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Old 04-24-2008, 12:39 PM
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10 @ 800 rpm!
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Old 04-24-2008, 01:06 PM
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10@725rpms
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