SCT tuner tire size/mph/mpg adjustment? - Ford Powerstroke Diesel Forum
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post #1 of 11 Old 09-14-2010, 05:49 AM Thread Starter
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Unhappy SCT tuner tire size/mph/mpg adjustment?

I am sure someone has covered this, but I tried to find it and can not. I purchased an SCT X3 from Stealth, and forgot I upgraded my tires to 35's after adding a lift kit.

I was reprogramming after towing this weekend and realized I never set the speed/tire revolutions, so I tried and I am totally lost.

Can someone with some knowledge on this help. I know it has a tire rev per mile or something but all the numbers were "stock size" and in the 500's. From my math I am making something like 1080 revs a mile or something, so I do not get it.

If anyone remembers the setting to put it on for 35's I know a lot of members run them.

Thanks!
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post #2 of 11 Old 09-14-2010, 06:35 AM
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what is your exact tire size, make and model?

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post #3 of 11 Old 09-14-2010, 06:44 AM
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For the 6.0 Diesel's we can not correct the speedo. The Abs controls the speedo and we are working on flashing the ABS system but we dont have a eta on release.
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post #4 of 11 Old 09-14-2010, 06:47 AM
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no the SCT wont correct the speedo but, in order to get your shift points dead on with the larger tires you need to set the rev per mile correctly.

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post #5 of 11 Old 09-14-2010, 06:52 AM
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Yes that is correct the tire revs is to correct the transmission shift points with the bigger tires.
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post #6 of 11 Old 09-14-2010, 07:05 AM Thread Starter
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Gotcha, intesesting all. Its an 05 was on stock 17s now on 18s with 35/12.5. Will go back to 17s with 35/12.5s for winter.

It is lifted 4.5 inchest as well.

Thanks for all your help, I just want to be able to actualyl figure my mpg correctly because it is telling me on economy or street tune I m still getting 13mpg and 10 mpg towing 7k travel trailer on tow mode. I neve rreally mapped something and figured it all out because I usually get fuel anytime I see it cheap.

Thanks.
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post #7 of 11 Old 09-14-2010, 07:13 AM
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In order to get the correct revs per mile, you can look up the brand of tires, model and size on the manufactures website and it will tell you what the revs per mile is.

just so you know, setting the revs per mile correctly will not change the odometer either. You will need to add something such as a speed wizard if you are trying to correct the speedo and odometer. Since the tires are only 35's ford can recalibrate the speedo very close to 35" tires.

There are other methods of figuring MPG. You need to figure out how many mile your speedo is off, typically this can be done on an interstate going from mile marker to mile marker, looking at what your ODO shows vs. what the mile markers tell you.

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post #8 of 11 Old 09-14-2010, 09:26 AM
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Quote:
Originally Posted by Abrannan19 View Post
In order to get the correct revs per mile, you can look up the brand of tires, model and size on the manufactures website and it will tell you what the revs per mile is.

just so you know, setting the revs per mile correctly will not change the odometer either. You will need to add something such as a speed wizard if you are trying to correct the speedo and odometer. Since the tires are only 35's ford can recalibrate the speedo very close to 35" tires.
Autoenginuity can do this as well.
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post #9 of 11 Old 09-14-2010, 10:41 AM Thread Starter
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Dang I was definitely under a different impression on the tuner then and it's capabilities. But either way, sounds like changing that on the tunre is basically pointless.
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post #10 of 11 Old 09-14-2010, 11:33 AM
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Check out the sticky "Tire Revs Per Mile."

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