Originally posted by warmonger:
1. Going rich on decel is normal because you are cutting the air off before the pcm cuts the fuel.
2. Best just to tune your WOT fuel curve by adjusting the MAF transfer function until you are in the recommended limits and then let the computer take care of everything else.



1. Maybe for a brief split second. The PCM turns off the injectors on decel so in reality the engine goes flat lean almost instantaneously.

2. That's the incorrect way to tune if you mean trying to tune WOT with just the MAF function. In reality that's as bad as hack tuning with a MAF voltage altering device. It screws with the load tables & nearly every calculation done by the PCM. (i.e. you get an erratic tune)
You should set the MAF function to match the curve of the MAF's electronics. (give or take some very fine tuning to match you intake setup) That's how I built your MAF Function Tom and you seem to be happy with it. (I still have the spreadsheets around here on my computer I bet)
Your actual tuning should be done using the fuel tables just like how the PCM is suppose to work. If all your other settings are done correctly (that's a big if, if you are not self tuning btw!) your fuel base tables should match your final A/F +/- a few percent. I know mine do. Good luck tuning like that on a WOT dyno because you really can't do it. You can definitely hit WOT A/F numbers but if the other A/F numbers are off it will cause everything else to slowly drift. This all goes back to a properly designed MAF curve to match your MAF and intake setup.

2000 SVT #674 13.47 @ 102 - All Motor! It was not broke; Yet I fixed it anyway.