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-   -   vacuum at idle (http://www.wrxtuners.com/forums/f75/vacuum-idle-19700/)

drkramm 08-10-2007 01:02 PM

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

nagyhead 08-10-2007 02:11 PM

thats what mine is at

robert.lshoc 08-10-2007 02:14 PM

mine too

metroscub 08-10-2007 03:06 PM

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

xmoniewrx 08-10-2007 03:09 PM

I'll make it x4

pearl_boxer 08-10-2007 04:00 PM

[QUOTE=metroscub;165056]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[/QUOTE]

From here:

[url]http://en.wikipedia.org/wiki/Vacuum[/url]

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).

metroscub 08-10-2007 04:08 PM

Awesome researching. +1 for sure on that one.

LiL Shoaf 08-10-2007 05:38 PM

mine is off the chart on my gauge, but that's due to my cams and P&P heads..

drkramm 08-11-2007 06:35 AM

ok thanks

was orignaly at 15in but then i found a leak

fixed that and dropped it down to 20 in

sfelix818 04-15-2008 11:40 PM

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

VD5505 04-16-2008 06:13 AM

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

Longshot 04-16-2008 06:19 AM

^^ You may have a small boost leak, how does the car run under WOT?




[QUOTE=sfelix818;192922]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[/QUOTE]

That is correct you have nothing to worry about

VD5505 04-16-2008 08:33 AM

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

Longshot 04-16-2008 09:14 AM

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.

NukeFusion 04-16-2008 10:13 AM

Higher elevation also lowers your vacuum..


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