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Old 03-10-2006, 11:33 PM   #1
Ohannon7
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Default Vacumm for Cobb stg II

What is everyones reading for Stage II vacumm

When I go to "Read Live Boost" mine is about -8 at idle upon start up, but my boost gauge reads like -20

"Read live boost" should also be reading vacuum too right

Im at Stage II w/ an STi top mount
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Old 03-11-2006, 01:01 AM   #2
23b_Rex
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is this the oem boost guage?
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Old 03-11-2006, 01:23 AM   #3
Ohannon7
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no, autometer

so what do you get off the AP???
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Old 03-11-2006, 10:03 AM   #4
Zumble
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It's normal. I think the AP just doesn't read past -10 or -9. My boost gauge is at -20 at idle also.
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Old 03-11-2006, 10:21 AM   #5
mars636
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The AP reads in PSI but your gauge reads vacumm in inches of mercury. which -20 in hg is about -9 psi
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Old 03-11-2006, 11:54 AM   #6
Ohannon7
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Ok, so my readings are cool, the AP should read about -8 or so? Im more concerned that the AP is right and not my gauge, thanks
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Old 03-12-2006, 09:19 AM   #7
scoobdude
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The AP will be as right as your sensors are.
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Old 03-12-2006, 11:04 AM   #8
Ohannon7
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Quote:
Originally Posted by scoobdude
The AP will be as right as your sensors are.
what does that mean
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Old 03-12-2006, 11:37 AM   #9
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If your sensors are off your reading on the AP will be off. They are generally pretty acurate though.
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Old 03-12-2006, 01:17 PM   #10
Zumble
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This is the correct answer I think. I believe there is no such thing as -psi actually.


Quote:
Originally Posted by mars636
The AP reads in PSI but your gauge reads vacumm in inches of mercury. which -20 in hg is about -9 psi
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Old 03-18-2006, 11:18 PM   #11
west005
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Quote:
Originally Posted by mars636
The AP reads in PSI but your gauge reads vacumm in inches of mercury. which -20 in hg is about -9 psi
This is true, also what I have to do for UTEC because it reads psi with the map sensor. -8psi =-16.28820629inches of mecury hg.
converter link-
http://www.people.virginia.edu/~rmf8a/convert.html
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Old 03-19-2006, 03:16 AM   #12
Ohannon7
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wow, nice find~!!!
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Old 08-06-2006, 08:31 PM   #13
runwrxrun
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i recently flashed my car with the stock mode 91 octane. i never used the live boost read until now. i dont rely on the oem column gauge because the needle sits below 0 with the engine off.

it seems people are reading -8 but mine reads close to -8.9 and at max it hits -9.1 fully warmed up during idle--- is this normal? the weather was pretty warm out (77 degrees) and i think this may play a part in the readings.

i havent checked the vacuum pressure when in stage 2 91. will the pressure be the same as if it were stock?
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