Wong Chip Vs. Factory Chip via LM-1
 

Here are a couple of indicative runs using the factory chip...
http://forums.pelicanparts.com/uploa...1117159277.jpg

and Steve's most recent iteration of his chip for the car...
http://forums.pelicanparts.com/uploa...1117159342.jpg

The car is a 3.2 with a premuffler in place of the cat and a dansk sport muffler. Otherwise the car is stock.

The AFRs running with the factory chip are on the lean side. Steve's chip nicely pulls the AFRs down to a more appropriate level and has the AFRs bouncing just under 13. The red line is WOT switch with the no signal zone indicating WOT. 2-second smoothing has been applied on both graphs.

Steve reworked my chip at least five times last year. I was driving him insane with LM-1 logs showing inconsistent results. We finally figured out that the variances we were experiencing were due to my use of ethanol blended fuel from time-to-time. Seems that stoich, or the ideal AFR for ethanol is quite a bit different than gasoline, so even a 5% ethanol blend will significantly skew the AFR results as well as changing the target range for optimum AFR.

All in a day's work for Steve...