My speedometer is off by 6-9mph. Higher speeds (above 50), its off by about 6mph. Lower speeds (between 20 and 50) it's off by approximately 9mph.
It has a four inch lift and 35" tires. It is an 08, JKU Rubicon.
So, I bought two different calibration devices. One is the ECRI and the other is the Vgate iCar Pro. The ECRI uses their own proprietary app. I use the Jscan app with the Vgate. Both units connect fine and say that the programming is successful when I change the tire size...however absolutely nothing changes with the speedometer. I have worked with both Jscan and ECRI, and both companies are stumped. I have done absolutely everything they can think of but the speedometer stays the exact same. I have even reprogrammed for 40" tires...no difference in the speedometer.
Any thoughts on where I can take this for a next step attempt?
It has a four inch lift and 35" tires. It is an 08, JKU Rubicon.
So, I bought two different calibration devices. One is the ECRI and the other is the Vgate iCar Pro. The ECRI uses their own proprietary app. I use the Jscan app with the Vgate. Both units connect fine and say that the programming is successful when I change the tire size...however absolutely nothing changes with the speedometer. I have worked with both Jscan and ECRI, and both companies are stumped. I have done absolutely everything they can think of but the speedometer stays the exact same. I have even reprogrammed for 40" tires...no difference in the speedometer.
Any thoughts on where I can take this for a next step attempt?