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Old 02-03-2004, 03:20 PM   #1
Gunner
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Default Stock Boost Gauge Question

My car comes with the factory boost gauge. Should it point to exact 0 when the engine is stopped? Mine currently points to a bit below 0 (negative). Is there any way to calibrate it? Thanks.
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Old 02-03-2004, 10:32 PM   #2
zojirushi
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mine is also like that...
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Old 02-03-2004, 11:48 PM   #3
Mulder
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This seems to be very common on the factory gauges. Ideally it should read exactly "0" but many of them don't. It isn't that big a deal as long as it's close, but it is annoying.
The gauge is mechanical and sealed, there is no zero adjustment. Even if you take it apart there is no adjustment inside although you can try bending things if you don't mind risking destroying it completely.
Since you both have 04's, you are presumably still under the 3/36 warranty. If the gauge came with your car there should be no reason why the dealer would not replace it under warranty if you went back and complained about this.
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Old 02-04-2004, 07:14 PM   #4
kenchan
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mine is slightly like that too. It use to point dead "0", but lately
slightly lower. But compared to my UTEC readings the guage
is accurate so i dont plan to replace it. Chances are, yours is
probably pretty accurate too under boost.
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Old 02-04-2004, 10:47 PM   #5
GT2RS
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I don't have the oem gauge but i used it's instructions for my install and this was mentioned...

"Due to the residual pressure inside the intake manifold, the pointer may deviate from (0)."

I hope that helps!
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Old 06-05-2012, 02:07 PM   #6
wrxstijdm
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BUMP on a very old thread, but is what's happening to mine...

So, this residual pressure eventually dissapears? Like when car is fully cold? Or is there always present?

My gauge was showing "zero" before I installed it yesterday.. but once I did, now is showing a little below zero when car is off...

Wondering as well if the "boost" reading is accurate or of it is not accurate due to this offset?

Gauge is LAMCO OEM...
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Old 06-05-2012, 03:36 PM   #7
wgr73
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I wouldn't worry about it. When you start the car it should go negative because you are in vacuum. One way you could know for sure if its accurate is if you log your cars manifold relative pressure.

Kind of a ghetto way to test at least to the point where the gauge should be reading 0-1psi is if you drive your car at 5-10mph and put your car in 3rd and romp the gas. The gauge should go up to around 0 to 1psi immediately and hold there until the car starts building boost. If it reads negative still (like -2 or less) your gauge is inaccurate.
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Old 06-05-2012, 03:42 PM   #8
wrxstijdm
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Thx for the tip!!! Will try it and see what happens!
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Old 06-05-2012, 11:40 PM   #9
wrxstijdm
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This is how my gauge currently looks when car is off:

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Old 06-06-2012, 10:04 AM   #10
wgr73
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That's fine. When you turn the car on it goes more negative right?
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Old 06-06-2012, 10:08 AM   #11
wrxstijdm
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Yeah it goes to between -0.04 and -0.05...
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Old 06-06-2012, 02:19 PM   #12
wgr73
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Yep normal. Your gauge isn't standard it's metric do keep that in mind.
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Old 06-06-2012, 02:20 PM   #13
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Quote:
Originally Posted by wgr73 View Post
Your gauge isn't standard it's metric
What do you mean by that?
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Old 06-06-2012, 06:25 PM   #14
Black94Snake
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Quote:
Originally Posted by wrxstijdm

What do you mean by that?
the stock gauge reads in bars and millibars instead of pounds and inches
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Old 06-06-2012, 06:36 PM   #15
wrxstijdm
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Really?

I though the Imprezas including a boost gauge as OEM was this exact same one (of course the one mounted on the steering column).

And these gauges are also part of the OEM Lamco Performance Pack, which was supposed to be part of the extra package you pay, but still OEM... Am I wrong?
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Old 06-06-2012, 06:40 PM   #16
the suicidal eggroll
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The OEM gauge is metric too...
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Old 06-06-2012, 07:05 PM   #17
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Quote:
Originally Posted by the suicidal eggroll View Post
The OEM gauge is metric too...
That's what I thought and that's why I asked why did I had to consider that...
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Old 06-07-2012, 02:58 PM   #18
JCaba90
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When Im running, and not giving it gas, its running at -0.5. When I'm driving normally (conservatively), I rarely see my gauge go above 0. Is this a malfunctions or is this normal? The gauge only goes above 0.1 when Im running it hard.
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Old 06-07-2012, 03:06 PM   #19
Black94Snake
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Quote:
Originally Posted by JCaba90
When Im running, and not giving it gas, its running at -0.5. When I'm driving normally (conservatively), I rarely see my gauge go above 0. Is this a malfunctions or is this normal? The gauge only goes above 0.1 when Im running it hard.
0 on a naturally aspirated car is WOT. On a boosted car, anything above 0 is positive manifold pressure.

I strongly recommend you read about barometric pressures, bars and millibars.
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