You would have to set your Superchip to a 22.25" tire height to adjust for the lower gear ratio:

(Assuming the current tire size is 28")

2.82/3.55 = .794 * 28 = 22.242

I don't have my S/C in front of me but do they even go that low? Mine was set for 27" and the speedo is spot on so I didn't screw with that setting.

Redbeard

 

I've got a headach, all that math is too much like school...lol

 

ROFL... Old School at that!

 

Old school for old farts.

Redbeard

"I may grow old but I don't have to grow up"

 

The shift points would remain the same only getting there faster
Only should have to calibrate the MPH Right or No

 

so what's the math for 392 ratio in 2006 daytona

 

Ignoring your 18 yr old necro post......you just change the ratio in the TCM. You don't futz with tire diameter unless you are actually changing the tire size.