Thanks again Andy. Okay, here's the story. The first graph is first run vs. last run. Note the nice A/F ratio going off the graph. That explains the wonderful black trim I have around my tailpipes. The final run was with the PCM reflashed with a new program for spark advance and A/F. See how the ratio stays at 13. This is why it is better to dyno tune your car. A chip will not be able to get this accuracy. It's more expensive, but I thought it was worth it.
The second graph shows the difference between the IMRC opening at 3200, 2500, and 3800. I know the earlier and later ones are higher, but this was during the tuning stage. The one at 3500 was before the tuning was finished. The important thing to look at here is the area under the curve. There is no way earlier or later will be better. I know Demon wrote that it may not apply to all cars. If you feel that way, by all means. I'm not trying to tell anyone what to do. I'm only showing concrete evidence to help people make the right choice. The intake manifolds are tuned to make this happen. They can not handle the change in air at the wrong rpm. I have about all the intake and exhaust mods you can do. I also have a chip which advanced the spark curve and this was the result.
I hope this is helpful to everyone. To reiterate, do whatever you want to your car. As long as you're happy, who cares what the dyno, the track, or anyone says. Happy racing!
