Adjusting SCT and Revs Per Mile? - Ford Powerstroke Diesel Forum
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Old 07-08-2008, 08:49 AM
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Adjusting SCT and Revs Per Mile?

I just thought about it and with me running my little 245's my speedo is bound to be way off, I guess this is where I would need to re calibrate it using the Revs Per Mile on my SCT, my 245's have 683 rpm so I'll just try to go with 685 and that should take care of my speedo right?
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Old 07-08-2008, 09:45 AM
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guess I'll just go drive it and see if it made a differnece
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Old 07-08-2008, 11:23 AM
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Hi,

Unfortunately the SCT will not correct your speedometer. I've been told Ford has a flash that corrects it pretty well and it is free. Some customers, because they have tall tires, do not wish to call attention to themselves and don't want to go to the dealer. In that case, I've heard the Tru Speed is pretty good.

Thanks,
Vivian
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Old 07-08-2008, 11:34 AM
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well then whats the revs per mile adjustment for?
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Old 07-09-2008, 03:00 AM
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Hi,

Shifting.

Thanks,
Vivian
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Old 07-09-2008, 03:42 AM
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The revs per mile for adjusting the speedo are stored in the VID Block. The SCT Currently doesn't write to that location, so it only changes revs per mile for part throttle shifting. The X3 and Livewire have the capability, it's just a firmware update. SCT is supposed to add this in the near future.
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Old 07-09-2008, 05:13 AM
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ok, thanks guys (and gals)
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Old 07-09-2008, 05:48 PM
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Ive been wondering this also, how exactly do you go about setting revs per mile thing. Especially when using the $pa@rtan tunes. Sorry for the threadjack bro.
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Old 07-09-2008, 07:41 PM
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look up what your tires revs per mile is on your tire manufacturers website and then just set your SCT to that
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Old 07-10-2008, 03:32 AM
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We have found this calculator to be most accurate:

This is the calculator we use to figure your revolutions per mile: Tire size calculator

It works with the metric system. If you have your tire size in the standard system, please figure the metric values first with this calculator and then go on to determine your revolutions per mile with the above calculator.
Metric Tire Conversion Calculator - Red Rock 4x4

We tested the revs from the manufacturers site, as opposed to our calculations with Powerdog and have found the Powerdog feels like better shifts. This is something you can try also.

Always remember if you are going to set your revs per mile, you must also set your gear ratio.

There are two differences when you set it yourself, in the options menu, before you load a tune onto the truck, as opposed to your tuner setting it for you.

1.) You can only set it in increments of 5, i.e., 575, 580, 585 ... Your tuner can set any number.
2.) Every time you load that file you need to reset your gear ratio and revolutions per mile. If it is set in your tune, by your tuner, it is always there and you don't need to reset it.

Hope this helps.
Thanks,
Vivian
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