Originally Posted by
TNT76
Start with MAP in Kpa, should read around 101Kpa with ignition on and motor NOT running.
At WOT if it gets below 100 Kpa or so then your starting to get a restriction upstream of the plenum (Throttle opening, Throttle body, Intake filter/pipe system etc. Downstream is harder to determine without swapping manifolds or flowbenches etc.
My std car used to get down to 93-94 Kpa at WOT in the mid to upper rpm, so there was a fair bit of improving to be done. New filter setup and SD tuning without the MAF got it upto a steady 99-100 Kpa right upto 6200rpm limiter