turbo:
I still stand by my recommendation of using IAC counts vs. RPM.
The RPM method has proven over the years to be problematic for most users.
And why use rpm as a set parameter?? The rpm is specified in "in the chip", therefore setting a comfortable IAC value will always create best results for maintaining the rpm that's in the chip, and NOT in the operators desires. IMHO 650 is too low, and is not a value found in any chips today (unless you're still stuck using a bone stock chip), and 500 is rediculously low.
You recommend what you think is best, I will continue to recommend what I think is best.