Alfaobd - programming 37s

[Lifted2wd]

I am trying to calibrate for my 37s finally. When I look at the values for the 35s that are preset it shows 25xx mm. I'm coming up with 940 mm conversion for my 37s. Anyone programmed 37s what value did you use.

 

[Bandit517]

37" diameter is 116.2" circumference which converts to 2951.48mm

I will say, while adjusting for my 35" tires I had to slightly skew the number to get correct. I actually still need to tweak it some more because my speedometer is still off just a little.

 

[MartyZ]

37" diameter is 116.2" circumference which converts to 2951.48mm

I will say, while adjusting for my 35" tires I had to slightly skew the number to get correct. I actually still need to tweak it some more because my speedometer is still off just a little.

Mine as well, I think I should have made my number slightly lower to accommodate for tread loss. I started the same way you did, converting from inches and starting with 2951.
I did it a second time at 2950 and it got me closer. (I'm off 3mph+ at 60MPH, Showing I'm going 63 when I'm going 60) If your speedo is reading fast your value is too high, if its reading slow, your value is too low) I would try something in the range of 2945 ~ 2950 and then give it a test run. I used Google maps to show GPS speed and compared it to my speedometer. My new value was better than it reading 8MPH slower than I was going (Stock tire size being used then) so I left well enough alone. Should keep me out of an accidental speeding ticket.