Speedometer recalibration

LIBERTYinLIBERTY · **Posted:** Tue Jan 17, 2012 6:58 pm

OK, went to dealer to get speedometer re calibrated and 2005 are different from 2006 models, They use the Startech to program on the 2006 which I have . I looked up the revolutions per mile, and plugged the number (original tire size: 225 75 16 is 688.63 rpm's vs new tire size: 265 75 16 is 637.23 rpm's). Now the speedometer is showing 58 mph when you are actually are doing 70 mph.

Does anyone know how it should be done to correct the speedometer? dealer does not know how to figure it.

LIBERTYinLIBERTY · **Posted:** Tue Jan 17, 2012 8:51 pm

All I am asking for here is just the facts......

black and blue · **Posted:** Tue Jan 17, 2012 9:16 pm

'09 here... the lowest the dealer could go on mine was 680 rpm. 255/70R17 are theoretically 649 rpm, but my specific tire is 669 which isnt too far off now.

that big of a difference in speed makes it seem like the dealer went up in rpm rather than down.

check this thread maybe: viewtopic.php?p=533100#p533100

LIBERTYinLIBERTY · **Posted:** Tue Jan 17, 2012 10:55 pm

Read trough that post, no resolution......

LetFreedomRing · **Joined:** Mon Jun 28, 2010 8:51 am **Posts:** 268

I'm not entirely sure about this, but I think Troy said before that KJ's after 2005(?) can't have their speedometers recalibrated with custom revolutions?

LIBERTYinLIBERTY · **Posted:** Wed Jan 18, 2012 4:15 pm

Talked to Keith at GDE, he told me to reverse calculate the rpm's. So we did that and ended up programing it to 765 rpm's an it is now within .5 MPH, but toe odometer is off approx 9%.

black and blue · **Posted:** Wed Jan 18, 2012 5:55 pm

765 is like a 26-27" tire. are these really squishy tires with deep tread or something?

LIBERTYinLIBERTY · **Posted:** Wed Jan 18, 2012 6:25 pm

No, I am running 265 75 16 Toyo Open Country. It is the electro-mechanical machines that are not perfect and had to trial and error till we found the sweet spot.

Speedometer recalibration

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