HPTuners 285/70r17 tire height entry
#1
HPTuners 285/70r17 tire height entry
What tire height are you guys using with HPTuners and 285/70r17. I recently swapped to these taller tires but speedo seems incorrect...
I used to use an old GPS to get the speedo calibrated, but it's now gone...
Appreciate any help...
I used to use an old GPS to get the speedo calibrated, but it's now gone...
Appreciate any help...
#7
32.83" is the tire's advertised height.
I'll try the app and play with the tire height to sync them. That's how I did it with the old GPS I had. Thanks for that app suggestion.
I'll have to pass on trying to figure out Atomic's formula...that's way beyond my pay grade, lol.
I'll try the app and play with the tire height to sync them. That's how I did it with the old GPS I had. Thanks for that app suggestion.
I'll have to pass on trying to figure out Atomic's formula...that's way beyond my pay grade, lol.
Trending Topics
#8
I have a gauge for that
iTrader: (42)
What rear end gears do you have?
I would suggest actually measuring the rolling diameter of your tires instead of going by the advertised. Make a mark on the bottom dead center of the tire to the ground, then roll the tire exactly 1 revolution until that mark is BDC again and make another mark on the ground. Now measure the distance between those 2 marks on the ground and divide by 3.1416 and that is your actual diameter.
I would suggest actually measuring the rolling diameter of your tires instead of going by the advertised. Make a mark on the bottom dead center of the tire to the ground, then roll the tire exactly 1 revolution until that mark is BDC again and make another mark on the ground. Now measure the distance between those 2 marks on the ground and divide by 3.1416 and that is your actual diameter.
#9
What rear end gears do you have?
I would suggest actually measuring the rolling diameter of your tires instead of going by the advertised. Make a mark on the bottom dead center of the tire to the ground, then roll the tire exactly 1 revolution until that mark is BDC again and make another mark on the ground. Now measure the distance between those 2 marks on the ground and divide by 3.1416 and that is your actual diameter.
I would suggest actually measuring the rolling diameter of your tires instead of going by the advertised. Make a mark on the bottom dead center of the tire to the ground, then roll the tire exactly 1 revolution until that mark is BDC again and make another mark on the ground. Now measure the distance between those 2 marks on the ground and divide by 3.1416 and that is your actual diameter.
Now that you've written the formula in English, lol, I can understand it. I'm just a dumb old mechanic...
What I did in the past, was went a steady 40mph, on level road, turned on cruise control, and compared to gps...then just skewed the tire height measurement, trial and error, and compared it to GPS, until they matched.
#10
I have a gauge for that
iTrader: (42)
Yea thats one way to do it haha
Here is the actual way (see attachment):
The VSS pulses per mile is my equation above, so in your case =((5280*12)/(32.83*3.15159))*40*3.73=91365.7
The number to the left (gear/trans pulses) is basically the equation above divided by 40, so 2284 in your case.
This is what the gear/tire wizard does, but if you need to do it manually this is how. It is important to actually measure your tire size like I described a few posts ago if you want it to be accurate.
Here is the actual way (see attachment):
The VSS pulses per mile is my equation above, so in your case =((5280*12)/(32.83*3.15159))*40*3.73=91365.7
The number to the left (gear/trans pulses) is basically the equation above divided by 40, so 2284 in your case.
This is what the gear/tire wizard does, but if you need to do it manually this is how. It is important to actually measure your tire size like I described a few posts ago if you want it to be accurate.