Speedometer correction? - Ford Powerstroke Diesel Forum
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post #1 of 4 Old 11-16-2012, 02:25 PM Thread Starter
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Speedometer correction?

Quick question for you all...just ordered my SCT ($305 off of Amazon). Going with custom tunes soon. I had previously been using a Superchips tuner at first to correct my speedometer due to larger tires and then I upgraded to the flashpaq.

Does the SCT make speedometer corrections? If not can I leave that portion only of the superchips tune to correct the speedometer?


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post #2 of 4 Old 11-16-2012, 02:49 PM

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I know the SCT is limited on how big of a tire it can correct for with stock gearing (~ a 35 tire is about as big as it can correct for). It sounds to me like in order to make this work, you would need to return your truck to stock with the SuperChips tuner, tune your truck with the SCT tuner, and then connect the SuperChips tuner and only adjust the tire size in the tuner. Basically, if you can use the SuperChips tuner to adjust the tire size of a stock tuned vehicle and NOT end up tuning it when you adjust the tire size, then I don't see why you couldn't do the same with the SCT and treating it as the stock tune. Hope this makes sense and helps.

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post #3 of 4 Old 11-17-2012, 02:45 PM

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SCT SF3 or X3 will adjust the speedo. Just verify the tire revs with the tire on the truck not the manufacturer number.

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post #4 of 4 Old 11-17-2012, 03:10 PM
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Just make sure your sct is up to date and it will adjust the speedometer, it will only go down to 600 revs per mile though. I found that with 325/65r18s 600 revs per mile made the speedometer to slow so I bumped it up to 610 and it is dead on verified with GPS. It's a little weird because I should be in the 585 to 590 range.

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