Originally Posted by
chaffe
Is it not 1.5 deg retard per 1 psi boost? APPROX
Not that much on any car Ive mapped I dont think.
My nova IIRC (not got the map in front of me) was 30 odd degrees at 0 psi of boost at high rpm, and was about 8 degrees when running 31lbs of boost, so if anything it was more like the other way around, ie 1 degree per 1.5 lbs of boost.
10 degrees per bar is probably the closest I'd get to naming a ballpark IME, so again thats 1 degree per 1.5 psi
But obviously every engine varies.