SCT and Tire Size - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 8 (permalink) Old 07-23-2006, 10:35 PM Thread Starter
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SCT and Tire Size

Alright, I have had the 35's on my truck for a few weeeks now, and finally got around today to pulling my XCal2 out, and changing the Tire Revs/Mile to make my speedometer accurate.

I tried 575, which is the number I calculated...no chage to my speedometer(I am using my GPS to find my true speed). I tried Rev/Mile numbers from 545 to 580, with no change.

Anybody know what's up? I thought that setting affected the speedometer.

2006 F250 CC SB 4x4
4.5 Icon 4-Link, TEI Spacers, and 5 Inch rear Springs.
Farmboy Fabrication Traction Bars.
SCT XCalII tuned by GoGoDiesel, DJ's, and Spartan...
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post #2 of 8 (permalink) Old 07-23-2006, 10:43 PM
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The setting only adjusts the tranny settings for tire size not the speedo.
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post #3 of 8 (permalink) Old 07-23-2006, 10:47 PM Thread Starter
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So my next question is, how do I adjust the Speedo?

2006 F250 CC SB 4x4
4.5 Icon 4-Link, TEI Spacers, and 5 Inch rear Springs.
Farmboy Fabrication Traction Bars.
SCT XCalII tuned by GoGoDiesel, DJ's, and Spartan...
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post #4 of 8 (permalink) Old 07-23-2006, 11:07 PM
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Superlift Tru-Speed or there is a guy on Ford Truck World that is going to release an item in the next month or so that will fix it.

Scott

2004 F350 XLT Sport - 6.0 - 12.5" DR Lift
17x14 Weld Sidewinders - 39.5"x16.5" Pitbull Rockers
Custom SCT By Doug At Direct Injection Performance
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post #5 of 8 (permalink) Old 07-24-2006, 12:45 PM
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you can go to the dealer and get them to change it for anything up to 35s. It would be a lot cheaper than paying the 250 or so for the tru speed

Aaron - 2004 F350 "Offroad Edition"

2003 F250 "Pulling Truck"
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post #6 of 8 (permalink) Old 07-24-2006, 07:27 PM
 
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Not trying to hijack this thread but do you adjust the tire size in the software? Or do you adjust it on the actual Xcal 2 unit it self?..When I load my Xcal 2 it asks if I want to change the param and I always choose no...Is this were and how it is done??
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post #7 of 8 (permalink) Old 07-25-2006, 12:23 AM
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Quote:
Originally Posted by bagstroke
Not trying to hijack this thread but do you adjust the tire size in the software? Or do you adjust it on the actual Xcal 2 unit it self?..When I load my Xcal 2 it asks if I want to change the param and I always choose no...Is this were and how it is done??

Yes, you need to enter the tire revolutions per mile to correct the tranny shifting.
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post #8 of 8 (permalink) Old 07-26-2006, 11:33 PM
 
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Is this for shift points? Or other?
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