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I have a 99 escalade that im trying to change tire size on. I have the "Error" in the current tire size value, so it wont allow me to enter the new tire size in. I tried using the spreadsheet in the sticky but I wasn't able to make sense of it. Im going from 265/70/16 to 265/75/16 or basically 30.6" to 31.6" If someone could help me manually scale this I would be very thankful.
Attachment 43693
Make the changes as shown.
Russ Kemp
Thank you very much. I actually came up with 95224 for VVS pulses per mile and 2381 for Trans Rev/Mile based on a 31.6 tall tire. I guess what was confusing me was why would the factory VVS pulses per rev-trans be set at "1" instead of the normal "40"??
Don't enter the actual tire dia, as that doesn't account for the loaded tire radius and will cause the speedo to read high. Use my values, and check with a gps.
Not sure why Hp Tuners set it the way they did, as it in Tuner Cat, the pulses per rev is 40.
Russ Kemp
ok thank you
ok how do i figure out a 255/40/18 on my 07 impala ss