How do I adjust the speedo - Ford Powerstroke Diesel Forum
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post #1 of 7 Old 11-16-2008, 11:20 AM Thread Starter
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How do I adjust the speedo

Got some new tires, Toyo Open Country A/T, 285/75 R18. Up from 275/70 R18. Is there any way to adjust my speedo, to offset the 3-4 mph difference at 70 mph. Can't they adjust it in the computer at the dealer? My truck is a 2006 F-350 PSD w/ torqueshift auto trans.
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post #2 of 7 Old 11-16-2008, 11:26 AM
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i know you can with the sct i just dont know how to figure out rev/sec or w/e it calibrates it as...i know theres a few things you can buy that will recalibrate without a tuner...maybe someone with some more info can come help ya

08 ECSB 6.4
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post #3 of 7 Old 11-16-2008, 11:54 AM
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The dealer can do up to a 35" tire
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post #4 of 7 Old 11-16-2008, 12:16 PM Thread Starter
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The OEM Tires were supposed to measure 33.1" in diameter, the new ones spec at 34.8" in diam. I guess that would qualify for a dealer adjustment?
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post #5 of 7 Old 11-16-2008, 12:21 PM
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yup...it's under 35"
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post #6 of 7 Old 11-16-2008, 12:40 PM
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Also the SCT does not adjust the speedo. The revs per mile is to adjust the transmission shifting.

Robert
09 F350 6.4 srw cc lwb 4x4
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post #7 of 7 Old 11-16-2008, 01:32 PM
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Go to the dealer or buy an aftermarket box.


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