boost guage questions

[Huw Powell]

> i just installed a boost gauge in my
> 90tq (kh, mac-07a) and had some intresting results...

Well, I'm not a turbo guy, but...

> 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.

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

--
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/