Pulsar Tuner Module 1500 Sport '15

djmaincheese · Jul 18, 2022

Just installed the Edge Pulsar in my 2015 1500 Sport....

I recently installed 35's and was hoping this would fix my speedo Calibration issue but no luck.
If I'm doing 70mph according to the speedometer it's actually only going 67mph on the GPS

I wasn't able to input the 35/12.5/20 so I entered 318-60-20

There is a setting for the axle ratio and have tried a few different settings but nothing seems to make a difference.
Was hoping someone on here could help before I called cs!

17sport · Jul 19, 2022

I have the Diablo i3 and my speedo was always off when I entered the actual tire size. My tires are 305/55/20 but when I programmed this using the i3 my speedo read about 10% fast. After a few tries it seems that using 285/55r20 got me closest to the actual speed and now my speedo of by less than 1%.

I used the speed calculator tool on the link below to determine what I needed it to be. Entered my actual tire size in the original tire size and adjusted the new tire size section until the speedo reading and actual speed boxes showed matched what my truck was showing. So for you I would enter 70mph for the speedo reading and adjust the new tire size until the actual reading calculate 67mph and use that size to program the truck.

Speedometer Calibration

Speedometer calibration made easy. Use our speedometer calibration calculator to compare how fast you are traveling and your speedometer reading.

tiresize.com

atreides · Jul 20, 2022

In the Pulsar menu, once you choose "Yes" for tire size, there should be an option for English or Metric sizes. Choose English to switch to inches.

You can also set tire circumference down to the millimeter in the body computer using AlphaOBD.

No set size will be absolutely perfect since not all 35 inch tires are actually 35 inches in diameter, but your speedo will be close enough. I set mine using AlphaOBD and it's less than 1 mph off at 70 mph.

Mendo · Feb 19, 2024

is setting the tire setting to only get the spedo accurate, or does it affect the way the motor performs?

Pulsar Tuner Module 1500 Sport '15

djmaincheese

Junior Member

17sport

Junior Member

Speedometer Calibration

atreides

Senior Member

Mendo

Junior Member

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