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Custom tune @ tire size question

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Old Feb 17, 2013 | 08:50 AM
  #1  
Tron84's Avatar
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From: The Garage
Custom tune @ tire size question

Not that I am running a staggered setup (285/40-18 X 255/45-18) what tire size do I put in when requesting new tunes?
I assume the front tires due to the speed sensor? Not sure though....
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Old Feb 17, 2013 | 12:35 PM
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You want to find out the tire revolution for your specific tire. Each brand is different even in the same size.
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Old Feb 17, 2013 | 12:42 PM
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Originally Posted by Tron84
Not that I am running a staggered setup (285/40-18 X 255/45-18) what tire size do I put in when requesting new tunes?
I assume the front tires due to the speed sensor? Not sure though....
I always assumed the rear tire size as I think the speed sensor is located where it can read the transmission output shaft? but I don't know for sure. Good question.
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Old Feb 17, 2013 | 01:05 PM
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Originally Posted by Tron84
Not that I am running a staggered setup (285/40-18 X 255/45-18) what tire size do I put in when requesting new tunes?
I assume the front tires due to the speed sensor? Not sure though....
In your case, it doesn't matter which size you enter, as both tire diameters are virtually identical, less than 1% difference.
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Old Feb 17, 2013 | 04:53 PM
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Originally Posted by Ministang
In your case, it doesn't matter which size you enter, as both tire diameters are virtually identical, less than 1% difference.
That makes it easy, what if they weren't that close?
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Old Feb 17, 2013 | 05:32 PM
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Reading will be based on the rear tire.
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Old Feb 17, 2013 | 07:12 PM
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From: The Garage
Ok so I just put in an order for new tunes from bama, it asks for REAR tire size.
Guess I never noticed that before.
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Old Feb 17, 2013 | 10:22 PM
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Rear tire size diameter is the issue. I used my GPS to dial it in exactly by mph. Even the tuner setting was off when I put on the new tires by putting in the new diameter. I had to do a little trial & error. Speedo is now 100% correct.
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