insylem

Can I replace my Boost gauge with a MAP gauge?
or at least get a MAP gauge?


My boost gauge goes from -30 Inhg
up to 0
then from 0 up to 20psi...

This is obviously a diffrential air pressure gauge.
What two pressures are being compared?

Is there a way to get a MAP gauge?

Yesterday I got my boost up to 15Psi (is that too much? Alot? good?)
I figure thats 30 inches of Hg, if thats above atmosphere pressure
then add the original 30 inches of atmosphere and I push 60 inches
of MAP?? That doesnt seem right. Is it?

rnjmur

That is correct. The boost guage measures the pressure above atmospheric. The MAP sensor is also a BAP (Barometric Absolute Pressure) sensor and calculates manifold pressure as well as atmospheric pressure. You could put in a guage like an Aeroforce Interceptor and look just at MAP readings if you would like to simply look at absolute pressure.

As far as 15 PSI with a 2.85 pulley, that depends on what other mods you have as well as your elevation. I am at 500 ft with a 2.95 pulley, GMPP header and GMPP exhaust and I see somewhere around 16 PSI at the top of third.