map psi vs boost gauge psi?

[Bill@HPTuners]

noticed that though the computers map sensor is saying say oh 25psi my boost gauge reads say 9-10, why is that?

[Missing2]

noticed that though the computers map sensor is saying say oh 25psi my boost gauge reads say 9-10, why is that?

Probably because..

the way map sensors are setup its like the first 1 bar is acctualy vaccume

then the following 1-2 bars are boost..

its hard to explane..

but.. if you subtract 1 bar from that reading of 25.. what do you end up with??

about 9-10

[Chris@HPTuners]

map sensor reads absolute air pressure, ie. atmospheric is 14.7 PSI.

Boost gauge reads pressure relative to atmospheric. eg. 10 PSI boost is 10 PSI above atmospheric, which equals 14.7 + 10 = 24.7 PSI absolute.

When people talk about a 2bar MAP sensor they mean a MAP sensor that can read 2bar absolute (29.4 PSI) or 1bar (14.7 PSI) of "boost"...

[SICK WS 6]

So...(bringing back an old thread ) if I just want actual boost on my 02 GTP I want to log BARO Sensor and subtract 14.7 to get actual boost?

[Bill@HPTuners]

So...(bringing back an old thread ) if I just want actual boost on my 02 GTP I want to log BARO Sensor and subtract 14.7 to get actual boost?

http://www.hptuners.com/help/tips_an...p_to_boost.htm

BTW old doesnt begin to describe this thread lol

[SICK WS 6]

Oh perfect, thanks Bill.
Yeah, searching rules.