Squish factor regarding tires size?

hampsterzone · #1 (**permalink**) 01-30-2011, 11:16 PM

My remodel'd Edge a.k.a Gryphon will be here soon. I have 35" tires and I will be accounting for them in my tunes. I believe Bill is writing my tire size into my tunes. But just in case when I use custom options to report my 4.56 gears, I would like to have the correct size for tires. It would be nice to have had everything written in prior to Bill writing my custom tunes. But no bigger! A little help with tire size would be awesome.

***Longshot270*** · #2 (**permalink**) 01-31-2011, 09:15 AM

When you first get the unit, program to a regular tune without making any changes. Drive around for a bit and then start changing the sizes.

***JackandJanet*** · #3 (**permalink**) 01-31-2011, 10:56 AM

Forgive me, but didn't I give you a size to try for starters? It won't have changed unless you mount different tires. For most tires, using a circumference that is about 3% less than the inflated circumference is very close. Your inflated circumference is about 2793mm. So, try 2709mm. If you have very low profile tires though, try a 2% reduction to start with (2737mm).

- Jack

hampsterzone · #4 (**permalink**) 01-31-2011, 09:18 PM

Thanks guys. I did get the tires size once but forgot to write it down. That is also the exact same number I had been using. Thanks a million. And I will program the transmission only canned tune and drive around for awhile then go for the custom 91 performance tune. I will be changing the gear size, speed governor, WOT fuel, and hope the other tunes are set properly by Bill. I always got great performance with the adjustments on the edge stage: 3. So I plan on copying it and having faith that the custom tune is set up perfectly for all my mods. Yay! Does this sound good?

***Longshot270*** · #5 (**permalink**) 01-31-2011, 09:32 PM

If you have been running high octane you can just go straight to the custom tune. You will not need to make any adjustments. They are intended to work as is.