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#1
09-25-2005, 03:42 PM
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Modifing computer for tire size problem.
I jacked up my left rear tire and counted the turns untill my odometer went 0.1 mi. It made 123 turns. The distance on the ground for one round measures 100.25 inches. That computes to 1,027.56 feet. My confusion is, 0.1 mi. is 528 feet. Am I overlooking something or what?
I put larger tires on my 2005 Silverado and bought a Hypertech programer in order to update my computer for the larger tires and am just trying to verify the accuracy. Any help appreciated, John B. in S.C. 
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#2
09-25-2005, 04:12 PM
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Re: Modifing computer for tire size problem.
I have a tire size calculator program on my computor..tell me your old size and new size and I can tell you what is going on.
__________________
Why do you never have enough time or money to do the job right the first time, but enough time and money to do it again? Got all the certifications 25 years ASE Certified Master Technician GM WCT Yea..I work at a DEALERSHIP....got a problem with that? Want to diagnose cars like the Pros? FOR SALE: OTC Perception 2 channel Labscope (badged as a Matco Reality) This is my personal labscope that I use to diagnose waveforms, like new, comes with leads and training video PM Me for details
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#3
09-25-2005, 05:04 PM
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Re: Re: Modifing computer for tire size problem.
Quote:
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#4
09-25-2005, 08:12 PM
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Re: Modifing computer for tire size problem.
you are getting a doubling effect from the spider gears in the rear carrier because only one tire is turning so driveshaft is turning twice as fast.
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#7
09-25-2005, 09:33 PM
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Re: Re: Re: Modifing computer for tire size problem.
Quote:
When your speedo reads 60 Mph you are really going 64.7 Mph
__________________
Why do you never have enough time or money to do the job right the first time, but enough time and money to do it again? Got all the certifications 25 years ASE Certified Master Technician GM WCT Yea..I work at a DEALERSHIP....got a problem with that? Want to diagnose cars like the Pros? FOR SALE: OTC Perception 2 channel Labscope (badged as a Matco Reality) This is my personal labscope that I use to diagnose waveforms, like new, comes with leads and training video PM Me for details
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#8
09-26-2005, 09:52 PM
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Re: Modifing computer for tire size problem.
Thanks for all the good info. Now for a new situation. I tried to get extended warranty for my 2005 Silverado and was told that it would not be insurable because of the larger tires that I have installed even though I adjusted the computer chip with a Hypertech Programer to recognize the larger tires.
Any suggestions taken to heart, John
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#9
09-26-2005, 11:17 PM
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Re: Modifing computer for tire size problem.
You can use this to check size differences: Tire Size Calculator
As far as warranty goes I wouldn't mention the hypertech to them...flash it back to stock when you take it in and then see what they say....you can always reprogram it after......also the difference between 245 and 285's isn't that much to notice visually.....at a nearby dealer a lot of last years Z71's were being equipped with 285/75/16(at the dealership)....
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#10
09-27-2005, 12:49 PM
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Yea, re-flashing is an option. When I was corresponding to an extended warranty rep., he was aware that I had reprogramed the computer to reflect the larger tires but that didn't seem to matter. He just had a problem with the larger tires, period. I wonder what the big deal is with larger tires? How can that hurt anything?
John
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