MAP sensor reading drops during wot?
I was on the dyno today with my car and this is what happened. It was in fourth starting the pull. When the car went to WOT the map reading went to 98.9 but through out the pull it decreased to 93.7. This occur from 3000 to 6300 rpm. It gradually decreased as rpms increased. What causes this to occur?

Michael

 

My guess is that it is an indication of some sort of restriction in the air intake path as rpm increases.
TB size, dirty air filter, collapsing elbow...something like that maybe?

 

Loss of air velocity. Throttle body too big??

Jeff D.

 

Heavy breather he's got there.. do you notice a drop in power?.

 

i second the notion of an intake restriction somewhere. shoulda taken off your filter to see if that made a difference.

 

He's ported his intake to fit that tb, i think it's safe to assume he's checked for basic intake issues.

I would like to see a datamaster log?, but maybe for personal reasons .