What should the air/fuel ratio be at wide open throttle ?
Motorhead hit it. Thats my reason to hit a dyno with the 489. Power numbers are nice, but the a/f mixture info is where its at.
Guys like Chilly and I think recently, Mike Burch, own relatively inexpensive wideband O2 dataloggers and they are slicker than even a dyno because you can record and log an entire session the way YOU drive
Thats my next toy. Besides that, no way to get the numbers from your car. (although I hear some guys take raw O2 sensor data and convert it using some sort of math, but for about 300 bones, the datalogger is pretty slick)