boost guage questions

[Robert Myers]

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At 09:30 PM 4/28/2003 -0400, Huw Powell wrote:

>>the guage reads -20psi (vacuum) at idle.
>
>That's five pounds per square inch *under* a total vacuum.  Meaning,
>there is something wrong with the gauge... unless you have antimatter
>idle stabilization or something.  What does it read when the key is on
>but the engine is not running?  (should be zero, or about 15 psi
>absolute)  It might just need some sort of calibration.

Or...  It reads 20 inches of vacuum (rather than psi) which isn't far from
normal at idle.


>>when i rev it up a bit it goes around -10

Or...  10 inches of vacuum which ia also normal for the described condition.

>>then after 3000 rpm when i juice it the guage reads about +5 psi
>>(boost). i didnt think it was supposed to read like that... whats it
>>supposed to look like?

For what car?  It varies.  5 psig is a bit low for most turbo Audis but .5
bar (or about 7+ psig) is fairly high for a non-modified 10 valve I5.  The
20 valve I-5 should reach higher boost levels than that.

Are you _sure_ that you are reading the units correctly?  I suspect that
your gauge reads from -30 inches of vacuum through zero up to perhaps 20
psi of boost.


____

Bush is Pro-Life.  Bush is Pro-War.  I'm confused.

Bob
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  Robert L. Myers  304-574-2372
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