SCT and custom tuning for taller tires. - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 4 (permalink) Old 12-14-2006, 01:46 AM Thread Starter
 
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SCT and custom tuning for taller tires.

I just installed new BFGoodrich 325/60R20's.
They stand 35 inches tall. My speedo is off by 4MPH according to my GPS.
My rear end ratio is 3.73. But what should I set my tire rev too?
I'll be running Inovative Diesel's, Street-Tow.
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post #2 of 4 (permalink) Old 12-14-2006, 02:25 AM
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586 revs per the BFG website for that tire.
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post #3 of 4 (permalink) Old 12-14-2006, 03:07 AM Thread Starter
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Thank you.
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post #4 of 4 (permalink) Old 12-14-2006, 05:21 PM
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The setting in the SCT only affects shifting. It changes the shift points to compensate for the larger rolling diameter of the larger tire. It will NOT affect your speedometer. You either have to get the dealer to change it(Only up to 35'), or get an after market device like the Speed Wizard.

Ray

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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