VersaTune User Forum

I have been doing some 3rd gear pulls and have noticed something unusual.
At wot, max boost pressure reads about 21psi but max MAP pressure reads about 35 psi ?
Looking at the log graph they overlay each other very closely so I assume everything is all good.
Why the different readings?

BOOST = MAP - BARO
Barometric pressure is about 14.5-14.7PSI at sea level depending on altitude, how mad the atmospheric fronts are in your area at that moment, and so on. So you may get a lot less than that, or a tad more.
So 35PSI MAP for 21PSI of Boost sounds about right, and now you see how useless is to log boost instead of MAP.

Very interesting mituc. Thanks for the info