When I purchased my 89tq tune from Doug, I had 3.55 gears and my tires were 255/50/17. Since then I changed my tires and gears. My tires are now 245/45/17 and I now have 4.10s. I modified my custom tune. I adjusted my tire revs to 785 per. min and gears to 4.09 (diablo doesn't have 4.10). When I compare my speed odometer to my GPS my speed odometer reads about 5mph than the GPS. When I modify my tune to 4.30 gears my speed odometer is off by only 2 mph. Does Doug need to re-send a new tune to reflect my new gears and tires?
set the revs to 810, but my speed odometer still reads about 2 MPH faster than the GPS. At this point I am not going to worry about it. Aren't most speed odometers off by 2-3 MPH anyway?
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