![]() This usually is enough to get it pretty spot on, but you can repeat the process a second time to get it a little closer. You would then take your current value for " Tire Revs per Distance" and multiply it by this correction factor to come up with the new value. How to Change Tire Calibration in HP Tuners Muscle Car Solutions 17. You would take 55 divided by 60 and get a correction factor of. If you are unable to find the information then you can use a GPS to measure your speed and compare to the speed the PCM is reporting to come up with a correction factor.Įxample: Your speedometer reports 55 MPH while the GPS reports 60 MPH. Make it your own with customizable layouts and data visualizations, and your own logo graphics. If you have aftermarket tires and are lucky then you may be able to find correct value to use for Tire Revs/Mile off of the tire manufacturer's website. RaceRender HP Tuners Home / Data Acquisition / RaceRender Video+Data Overlay Software Create amazing videos with high-tech data overlays for GPS, OBD-2, and much more Show more of the action with picture-in-picture video, 360° video, and 4K Ultra HD. honestly im not versed enough in this to even tell if it made a difference, and also there is snow everywhere on the roads so this is also affecting things. If this is not done, the changes you make to the " Tire Revs per Distance" parameter will not make a difference. i found a thread stating to change the final drive gear ratio so i tried, i went from my stock 3.73 gears and changed it to 3.44 which would be the overall gear ratio with the new tire size. ![]() ![]() Right now it is the stock 3.42 :1 so would obviously change that to 4.10. To make a correction, the very first thing that has to be done is setting the " Use VID" parameter to disabled. Using HPTuners, under Speedometer tab there is a box for setting final drive ratio. A few people have asked me how to correct the reading of their speedometer due to tire size changes.
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