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post #1 of 24 (permalink) Old 09-01-2009, 10:03 PM Thread Starter
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sct tire calibration

looking to adjust my tire calibration on my sct but dont know which one it is since its not actuall tire size. i have 35x12.50x17 can anyone help out thanks

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post #2 of 24 (permalink) Old 09-02-2009, 12:01 AM
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Re: sct tire calibration

Place a mark on the ground and on any tire at the 6 o'clock position. Roll the truck making one complete revolution and stopping the tire mark at the 6 o'clock position again and mark the ground. Using a tape measure find the distance between the marks in inches. Using 63360 (inches in a mile) divided by the measured distance in inches will equal your tire revs per mile. Just round up or down whatever is closest to the value you can enter into the SCT ( IE your revs equal 609 use 610, etc...) 66360"/104"= 609

Dont forget your tires will get smaller so the revs will go up over time so maybe rounding up will be a better option.


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post #3 of 24 (permalink) Old 09-02-2009, 06:31 PM
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Re: sct tire calibration

you could also look at the specs sheet on the tire manufacturer's web site...
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post #4 of 24 (permalink) Old 09-02-2009, 11:26 PM
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Re: sct tire calibration

I have dick cepek 35's and i'm using 590 revs per mile. It is still about 4mph fast, so when I feel like retuning I will use 585 or 580. I would rather my speedo be faster than the truck rather than vice versa...
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post #5 of 24 (permalink) Old 09-02-2009, 11:29 PM
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Re: sct tire calibration

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Originally Posted by Rubenk View Post
I have dick cepek 35's and i'm using 590 revs per mile. It is still about 4mph fast, so when I feel like retuning I will use 585 or 580. I would rather my speedo be faster than the truck rather than vice versa...
From what I have gathered the 6.0 CANNOT have the speedo recal through the SCT. The SCT has that setting for shift points and cars that it will change. I have tried many things with my 35's and it was always 4mph fast @50mph. The only way to do it is through a tru speed or something hard wired.

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post #6 of 24 (permalink) Old 09-02-2009, 11:34 PM
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Re: sct tire calibration

Hmm, thats not what ive always heard and It went from being 8-10mph fast to only 4 with my last change of the rev's per mile...or maybe i'm crazy?
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post #7 of 24 (permalink) Old 09-02-2009, 11:37 PM
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Re: sct tire calibration

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Originally Posted by Rubenk View Post
Hmm, thats not what ive always heard and It went from being 8-10mph fast to only 4 with my last change of the rev's per mile...or maybe i'm crazy?
There is always a chance I could be wrong but I had a fairly big thread on this and it came to the conclusion that the SCT could not do it. I was also told Ford could do it, I went there and they couldn't either. AE can do a 7.3 but not a 6.0. I may just plug my SCT in tonight and put a ridiculous rev/mile number in and see what happens.

2006 F250 CC LB FX4 Lariat
ARP studs, SCT X3 IDP & Gearhead tuned, S&B CAI, straight pipe, FASS 150/180, FCDP solid uppipe, Dieselsite coolant filter
2.5" BTS leveling kit, 35" Xtreme A/T's on XD Hoss 18's, N-Fab prerunner bar w/ 3 9" Hellas
Pioneer double din, JL components, 3 10" Pioneer subs

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post #8 of 24 (permalink) Old 09-03-2009, 12:03 AM
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Re: sct tire calibration

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Originally Posted by 06powerstroke View Post
There is always a chance I could be wrong but I had a fairly big thread on this and it came to the conclusion that the SCT could not do it. I was also told Ford could do it, I went there and they couldn't either. AE can do a 7.3 but not a 6.0. I may just plug my SCT in tonight and put a ridiculous rev/mile number in and see what happens.
I was considering doing the same thing actually lol...lemme know what you find out if you do!

btw, i'm using gps to figure out my mph
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post #9 of 24 (permalink) Old 09-03-2009, 12:29 AM
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Re: sct tire calibration

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Originally Posted by Rubenk View Post
Hmm, thats not what ive always heard and It went from being 8-10mph fast to only 4 with my last change of the rev's per mile...or maybe i'm crazy?
Must be crazy. SCT does not alter the speedo reading on our trucks, only corrects the tire rpm for shifting purposes. Ford can recalibrate your speedometer, but it is not very common, and the average tech prolly does not know how or have the time to mess around doing it.

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post #10 of 24 (permalink) Old 09-03-2009, 12:35 AM
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Re: sct tire calibration

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Originally Posted by fuekear View Post
Must be crazy. SCT does not alter the speedo reading on our trucks, only corrects the tire rpm for shifting purposes. Ford can recalibrate your speedometer, but it is not very common, and the average tech prolly does not know how or have the time to mess around doing it.
That is what I thought....

2006 F250 CC LB FX4 Lariat
ARP studs, SCT X3 IDP & Gearhead tuned, S&B CAI, straight pipe, FASS 150/180, FCDP solid uppipe, Dieselsite coolant filter
2.5" BTS leveling kit, 35" Xtreme A/T's on XD Hoss 18's, N-Fab prerunner bar w/ 3 9" Hellas
Pioneer double din, JL components, 3 10" Pioneer subs

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