but i tink it s really the timing advance who plays a lot of the engine perfomence
i have the piper cam t2 and the timing off the cam is 69-21 added make 90 plus 180 make me 270 deg duration

and her are the rules Cam duration Advance Idle speed expected
cam
deg ignition rpm
timing
270 10-12 600-800
280 12-14 900-1000
290 14-16 1000-1100
300 16-18 1100-1200
310+ 18-20 1100-1400

it s mean it looks like it have to be agin like 12 degree like standard? but with mutch boost will be 10 the best no because at 8 degree the car don t have so mutch power...?