vacuum at idle - Subaru WRX Forum
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post #1 of 26 Old 08-10-2007, 02:02 PM Thread Starter
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vacuum at idle

at idle what vacuum are you guys pullin ?

im at 20 in does that seem right ?

all stock other then my autometer guage lol

thanks
dr
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post #2 of 26 Old 08-10-2007, 03:11 PM
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thats what mine is at

Dom Tuned 2003 WRX Wagon
251.3 WHP
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post #3 of 26 Old 08-10-2007, 03:14 PM
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mine too
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post #4 of 26 Old 08-10-2007, 04:06 PM
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yes sir, me too.
I was told that the vacuum is read a little differently than positive boost, like in feet or something like that, I don't know for sure, but maybe someone else does.

anyhow, 20 is normal

Matthew
Wow, it can turn well too?
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post #5 of 26 Old 08-10-2007, 04:09 PM
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I'll make it x4
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post #6 of 26 Old 08-10-2007, 05:00 PM
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Quote:
Originally Posted by metroscub View Post
yes sir, me too.
I was told that the vacuum is read a little differently than positive boost, like in feet or something like that, I don't know for sure, but maybe someone else does.

anyhow, 20 is normal
From here:

http://en.wikipedia.org/wiki/Vacuum

Vacuum is measured in units of pressure. The SI unit of pressure is the Pascal (unit) (abbreviation Pa), but vacuum is usually measured in Torrs for Torricelli an early Italian physicist (1608 - 1647). A Torr is equal to the displacement of a millimeter of mercury (mmHg) in a manometer with 1 torr equaling 133.3223684 Pascals above absolute zero pressure. Vacuum is often also measured using inches of mercury on the barometric scale or as a percentage of atmospheric pressure in bars or atmospheres. Low vacuum is often measured in inches of mercury (inHg), millimeters of mercury (mmHg) or kiloPascals (kPa) below atmospheric pressure. "Below atmospheric" means that the absolute pressure is equal to the current atmospheric pressure in inches of mercury (e.i. 29.92 inHg) minus the vacuum pressure in inches of mercury. Thus a vacuum of 26 inHg is equivalent to an absolute pressure of 4 inHg (29.92 inHg - 26 inHg).

Shaun
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post #7 of 26 Old 08-10-2007, 05:08 PM
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Awesome researching. +1 for sure on that one.

Matthew
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post #8 of 26 Old 08-10-2007, 06:38 PM
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mine is off the chart on my gauge, but that's due to my cams and P&P heads..

02 WRX.. "It's fun when it runs.. Problem is that it hardly ever does..."
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post #9 of 26 Old 08-11-2007, 07:35 AM Thread Starter
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ok thanks

was orignaly at 15in but then i found a leak

fixed that and dropped it down to 20 in
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post #10 of 26 Old 04-16-2008, 12:40 AM
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I know this is an old thread but I just installed my prosport electrical boost gauge and my vacuum at idle is -22 inhg. Is there something wrong there? I hit my target boost no problem.

mods: catless TBE, HKS BOV (I know these dont help the car), and a protune
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post #11 of 26 Old 04-16-2008, 07:13 AM
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Damn!!! i only pull around 14 to 15 lbs of vaccume. but it runs great and it has always been at that psi. do you guys have any ideas why mine would be lower than 20
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post #12 of 26 Old 04-16-2008, 07:19 AM
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^^ You may have a small boost leak, how does the car run under WOT?




Quote:
Originally Posted by sfelix818 View Post
I know this is an old thread but I just installed my prosport electrical boost gauge and my vacuum at idle is -22 inhg. Is there something wrong there? I hit my target boost no problem.

mods: catless TBE, HKS BOV (I know these dont help the car), and a protune
That is correct you have nothing to worry about

Mike
DTRacing Tuned
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post #13 of 26 Old 04-16-2008, 09:33 AM
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it runs great it got dyno on a dyno pack at 311WHP it was only pulling that amount of vaccume with my stock turbo now i have a VF22 and it still only pully around 13 on the vaccume side
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post #14 of 26 Old 04-16-2008, 10:14 AM
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Hmmmmmmm if it runs good at WOT it could be just because of the tune on your car and if thats the case I'm sure it's fine.

Mike
DTRacing Tuned

Last edited by Longshot; 04-16-2008 at 10:16 AM. Reason: thoughts
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post #15 of 26 Old 04-16-2008, 11:13 AM
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Higher elevation also lowers your vacuum..
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