noticed that though the computers map sensor is saying say oh 25psi my boost gauge reads say 9-10, why is that?
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noticed that though the computers map sensor is saying say oh 25psi my boost gauge reads say 9-10, why is that?
Quote:
Originally Posted by foff667
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
:)
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"...
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.htmQuote:
Originally Posted by SICK WS 6
BTW old doesnt begin to describe this thread lol
Oh perfect, thanks Bill.
Yeah, searching rules. :)