Switched from a 7747 to 8746 computer in the IROC. What a difference. The heavily modified 7747 bin. would run the car OK, but not great. Plugged in the 8746, loaded a stock 5.7 auto BIN and the car runs better than my months of tuning with the 7747. Here's the problem......I can't modify the 8746 BIN without getting the flashing SES light. Would disabling the checksum let me modify the BIN or am I missing something? How do I disable the checksum on $61 aka 8746?

I'm using an ostrich and tunerpro rt.

using Jon Prevost's 8746 xdf and anlu 5369 BIN

Thanks,

MISTA