Zeroing the Boost Gauge

Q&A regarding engines, turbos, and intercoolers and power upgrades

Postby alltracman78 » Sun Sep 26, 2004 1:53 am

RedCelicaTRD wrote: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.


That is correct. I was making a generalized statement.
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Postby gearhead313 » Mon Sep 27, 2004 12:39 pm

holy cow people, u are reading too much into this!


True, ambient pressure changes...but you are trying to gauge your boost setting off of zero. If the elevation would change my boost gauge by 4Hg or something, then i would re-adjust it back to zero so i had the most accurate boost reading possible.
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Postby alltracman78 » Mon Sep 27, 2004 5:38 pm

Now that I think about it, when I was going through the mountains to Tn, my boost g read 0. :shrug:

[I stopped so my buddy could raise his convert top]
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Postby SuperSprynt » Thu Sep 30, 2004 11:48 am

gearhead313 wrote: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.


Thanks I'm going to take a look at that. I havent gone over 15psi with the gauge but I couldnt see that being an issue, I think its just crappy.
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Postby ___Scott___ » Thu Sep 30, 2004 6:13 pm

When you are talking about cheap boost/vac meters, elevation doesn't matter because they are referenced to atmospheric pressure where ever you happen to be.

Vacuum and boost are both myths anyway. Think in terms of absolute pressure and life is simpler.
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