Zeroing the Boost Gauge

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Zeroing the Boost Gauge

Postby SuperSprynt » Thu Sep 23, 2004 6:36 pm

When I got my gauge it was perfectly on 0lbs, now its almost a full -1, does anybody know IF a gauge can be recalibrated or is this common and crappy all in one?

Autometer btw.
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Postby illGT4 » Thu Sep 23, 2004 8:05 pm

I don't think you can zero it.. :(

1 autometer gauge I had never moved from 0
the other 1 was slightly under 0 :(
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Postby alltracman78 » Fri Sep 24, 2004 2:59 am

Havn't had mine do that yet... :?
Call autometer and ask them, that's your best bet.
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Postby SuperSprynt » Fri Sep 24, 2004 2:55 pm

Correction, since I posted its now on -1lbs.
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Postby CMS-GT4 » Fri Sep 24, 2004 3:03 pm

Does this guage show negative? Stock engine should be showing around -15hg when at idle. I have never heard of a boost guage that sits on 0 unless it does not show negative.
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Postby toayoztan » Fri Sep 24, 2004 4:22 pm

And just to clarify, negative isn't in "lbs", it's in "in Hg" if the gauge shows vac.

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Postby alltracman78 » Sat Sep 25, 2004 1:32 am

CMS-GT4 wrote:I have never heard of a boost guage that sits on 0 unless it does not show negative.


I think he means when the engine isn't running.
And engine should be at 18-20 in/hg.
15 in/hg is a little weak.... :|
Last edited by alltracman78 on Sat Sep 25, 2004 1:56 am, edited 1 time in total.
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Postby SuperSprynt » Sat Sep 25, 2004 1:53 am

Yeah im talking about when the car is off. When im idling cold its 18, warm 20.
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Postby toayoztan » Sat Sep 25, 2004 2:51 am

mine sits at -1 in Hg when the car is off too...i don't think it's really important much, as long as it says 18-20 in Hg when idling. And yeah, 15 in Hg would be pretty weak...suggests pretty good vac leak.

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Postby Gary » Sat Sep 25, 2004 3:41 am

Could it be that there is small vacuum left behind the TB when engine is off? :shrug:
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Postby furpo » Sat Sep 25, 2004 3:49 am

wha sort of boost have you been running. i mate of mine has a 4g61 mitsi running up to 26 psi boost and before he got the right gadge it would move around quite a bit.

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Postby alltracman78 » Sat Sep 25, 2004 8:55 am

Gary wrote:Could it be that there is small vacuum left behind the TB when engine is off? :shrug:


Doesn't matter. The air pressure inside the engine (once it's off) will be the same as outside. Abient pressure should be 0psi.
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Postby gearhead313 » Sat Sep 25, 2004 2:18 pm

I had the same problem a while back...


What you do is take the bulb out and inside you can see a curlyQ type spring thing. Jam a small screwdriver in there and lightly start pusing inward or then outward on the spring and watch the needle move. Once u tweek around in there, you'll be able to get it exactly where u want it.
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Postby RedCelicaTRD » Sat Sep 25, 2004 5:24 pm

Ambient pressure is not zero. Pressure varries from day to day within a certian range. You elevation will change it the most. however at my elevation i would have ~4 inches of Hg vacuum which is way more then my gauge shows so it is possible the gauge is a piece of shit.
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Postby CMS-GT4 » Sat Sep 25, 2004 8:01 pm

I do live in the hills of tn, mahaps my evelvation is related.
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