Originally Posted by dinasrt

I've searched here but can't find the answer, so hoping someone will help. I have hooked up my upgraded ScanGuageII to the SRT. It seems to be working just fine. I cleared the code & CEL I had (PO505). It is showing me MAP,Volts,Coolant Temp.,I.A.T.,TPS,Ign.Timing,load,brake horsepower,MPG,MPH,RPM, numerous fuel/trip data, economy, etc. More info. than I'll ever use. But here is question. The MAP reports in P.S.I. (although you can change to kilo-pascals if you wanted) and I wondered what the conversion formula is (if there is one) to figure what BOOST is. I saw on another thread someone mention that MAP=Boost+14.7 But 14.7 is just the "stioch" AF ratio,and that can't be right. When I'm at W.O.T. I can see 28-29p.s.i. when I'm brave enough to avert my eyes to it. And I know I'm not producing 28lbs. of boost. I know there are variables(Temp.Elevation,etc.) but generally speaking can this be approximated w/o having to get a stand alone boost gauge or Zeitronix setup like a lot of you have? This is my 1st supercharged engine and just trying to understand it better. Bob