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  #25  
Old 12-07-2015, 09:58 AM
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Re: Speedometer Calibration for larger diameter tires

N8ball, I have read with the intune tuner that changing tire size messes up the ABS and turns it on. It sounds like you did not have that problem. What year is your Jeep if you don't mind me asking. I just upsized my tires and have a diablo intune DCX but have not changed the tire size due to potential ABS issue

thanks

rob

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  #26  
Old 12-08-2015, 10:22 PM
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Re: Speedometer Calibration for larger diameter tires

FWIW, thanks to n8ball, changing the overall diameter via diablo tuner worked. I changed it to 31 for the 31.1 diameter of the 280/50r20's. According to the tuner the original tire size was 29.5. No ABS lights. my speedo seems correct according to the digital display on the Honda next to me. I will test via phone GPS in the morning. My fuel economy also seemed to be registering better from 16.4 to now almost 17. With my old tires I was averaging 18.4. I also am going to up my PSI from 35/34 to 38. I think these are supposed to run at 36
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  #27  
Old 12-28-2015, 10:24 AM
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Re: Speedometer Calibration for larger diameter tires

Quote:
Originally Posted by rlefig View Post
FWIW, thanks to n8ball, changing the overall diameter via diablo tuner worked. I changed it to 31 for the 31.1 diameter of the 280/50r20's. According to the tuner the original tire size was 29.5. No ABS lights. my speedo seems correct according to the digital display on the Honda next to me. I will test via phone GPS in the morning. My fuel economy also seemed to be registering better from 16.4 to now almost 17. With my old tires I was averaging 18.4. I also am going to up my PSI from 35/34 to 38. I think these are supposed to run at 36
That hasn't worked for all that have tried since Diablo came out with these tuners years ago..... Always threw an ABS light that was very hard to reset?

What is the exact firmware version for your Diablo tuner that changes the tire size and works without issue?
Please post it. Thanks
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  #28  
Old 12-28-2015, 11:06 AM
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Re: Speedometer Calibration for larger diameter tires

I will post exact firmware after noon ET. I went with the overall diameter option of changing the size. When I looked at it the Diablo had the overall diameter as 29.5, which is too small for the stock 18's. I upped it to 31 inches via the intune which is very close to the overall diameter of 31.1 for the Cooper 285/50r20's. I had no ABS light and definitely noticed a better reading on MPG and I am accurate speed wise with phone GPS and traveling next to a Honda with a large digital display.

Loading up the new tire size was the same as loading up a tune or modifying an existing tune
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  #29  
Old 01-04-2016, 12:55 PM
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Re: Speedometer Calibration for larger diameter tires

Sorry for taking so long to respond, with the holidays and family dropping by and football along with framing a basement, just not much time.

I think my firmware is 1r01u, that is what it states in the About tab of the application.

rob
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  #30  
Old 01-04-2016, 07:26 PM
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Re: Speedometer Calibration for larger diameter tires

So if putting bigger tires on your car makes it think it's driving less miles than it actually is.. Do the dealerships say anything to you about lease miles, or warranty miles when you take it in for service?
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  #31  
Old 01-04-2016, 07:40 PM
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Re: Speedometer Calibration for larger diameter tires

Well now that the car thinks the tires are registering correctly my mileage should be accurate. If the car EVIC thought I had 30" tires but I had 31" that would throw of mileage and odometer. But, I have never leased a car and always go beyond warranty so not sure how dealerships react
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  #32  
Old 01-05-2016, 10:00 AM
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Re: Speedometer Calibration for larger diameter tires

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Originally Posted by OcGrand2015 View Post
So if putting bigger tires on your car makes it think it's driving less miles than it actually is.. Do the dealerships say anything to you about lease miles, or warranty miles when you take it in for service?
I've up-sized tires on my previous car and it was never an issue for service or warranty matters. I just up-sized tires on my GC and I'm not going to worry about speedo or odo inaccuracy, and I doubt it will be an issue with the warranty. I haven't done the pencil-and-paper math for the bigger tires, C = πD (where D1 was 30.5" for the 265/50 Forteras and D2 is 31.9" for the 275/55 Duratracs), but by a rough eyeball that looks to be a delta of about 3%. I had 27K when I installed the Duratracs, so that is 9K short of the 36K warranty limit, and 3% of 9K is 300 miles. All by rough eyeball math.

Too small a number to be concerned with for me. Anyway that is and will be my experience but I will not speak for what Jeep would say or do.

Oh and my last car was a Honda so I never had any warranty discussions with them, LOL.
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  #33  
Old 01-05-2016, 01:56 PM
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Re: Speedometer Calibration for larger diameter tires

I just traded in a 2012 for my 2014. My 2012 had 275/55/20 on them since around 400 miles and I ran that size to 46k when traded in. Not once did the dealership have an issue. In fact, when I traded it in, I asked if I could get the tires off of it cause they were almost brand new. The dealership asked if I could leave them on because they made the Jeep. LOL needless to say I said give me money off my 14' for the price of the tires.

I plan on doing the same with my 14' limited when I get the funds for new tires. 275/55/20 Goodyear Wrangler Duratrac


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  #34  
Old 01-05-2016, 03:50 PM
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Re: Speedometer Calibration for larger diameter tires

echo', while it's unlikely that up-sized tires will cause a warranty issue, in today's world, the legal-beagles could theoretically cite "non-standard" equipment in the case of significant drive train issues if they looked close enough and wanted a scape-goat. It's a risk. A small one, but a risk, nonetheless. Each person should make decisions about what's best for them by considering all the angles.
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  #35  
Old 01-05-2016, 07:14 PM
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Re: Speedometer Calibration for larger diameter tires

Quote:
Originally Posted by Jim_in_PA View Post
echo', while it's unlikely that up-sized tires will cause a warranty issue, in today's world, the legal-beagles could theoretically cite "non-standard" equipment in the case of significant drive train issues if they looked close enough and wanted a scape-goat. It's a risk. A small one, but a risk, nonetheless. Each person should make decisions about what's best for them by considering all the angles.
Agreed, Jim, good point and that is why I included this in my post:
Quote:
Anyway that is and will be my experience but I will not speak for what Jeep would say or do.
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  #36  
Old 01-18-2016, 11:33 AM
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Re: Speedometer Calibration for larger diameter tires

This recent thread had me thinking and technically oversized tires are a modification. It is up to the dealer to prove the modification caused a warrantied part to fail, so I think an egregious violation like putting 35" tires on might be an easy case for the dealership. Only 1" larger prolly has as much extra weight as a tire with a bunch of mud on it.
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