How to calibrate your speedometer with a sctx4 for bigger tires/wheels

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[@inergy7585]

My tuner is the same way but I don’t get the option for that

[@carterbaumer358]

Thanks man!

[@StevenNeidlein]

So I have to contact a tuner to do this even though I have a sct 4 device?.

[@StevenNeidlein]

2017-2021 mustangs the body control module computer automatically fixes this :) no tunning needed

[@SARDOG]

My 2017 Mustang is 3mph off at anything above 45mph....

[@BLKKAT.]

Wheel and tire size or anything of that nature is not information that is stored in, monitored by, or calibrated by the BCM of any Ford vehicle.

[@rockanthems]

I’ll change my rear end from 2.73 to 3.55… Do I still have to go through the tire measurement and all that if I have the same tires on or will it automatically set the speedometer when I change the rear end ratio?

[@middickmotors6019]

You just need to change the gear ratio

[@TheRealArsenal]

So I recently got a Bama RevX. Made by SCT. I just had a new diff put in. I put in the tire size and the ratio. The car is still off? I’m stumped on what to do now at this point.

[@MustangGuy2000]

Did you get it figured out?

[@bryanlipe900]

Revs per mile? Revolutions per minute🤔

[@SJ_MERC]

What site do you use?

[@Johndnardi07]

I have folks showing me this video that are driving a Gen 2 or Gen 3 Mustang car. They should know that you car it will work on since its a Gen 1 but this will not work on a Gen 2 or Gen 3 and only on a Gen 1 if the allowance is there within the tune exporting process where they can enable adjustable options . So if someone is reading this and has a gen 2 or 3 Mustang then this video is not for your Mustang

[@middickmotors6019]

I didn't know that then and have since been trying to explain that to others. Well said

[@angeljennings3317]

will it work with a 2014 v6?

[@esurles1]

Any idea why my sct x4 didn't ask me the gears ratio and rev/mile I wanted to adjust my speedometer for my 265/35r18s but didn't see the place where to put it in

[@larrymcconnelliv313]

Did you ever figure that out and get it fixed?

[@wo0n563]

Will this work on a 2002 dodge dakota?

[@middickmotors6019]

If you buy a tuner for a dodge then yes it should work.

[@FLATearthGARY]

My tires sizes are offset, larger in rear on my 2012 mustang gt, do I google, the revs per mile, by the size of my front or rear tires? Thx

[@middickmotors6019]

You go by the rear tire.

[@ccol6164]

Would it do subaru tribeca 2012?

[@middickmotors6019]

A Cobb tuner might.

[@bijan426]

Well your actually going slower since it takes longer for a bigger wheel to go around...

[@middickmotors6019]

It's actually the opposite because the speedometer reads the axle speed so for every axle rotation the tire rotates the same no matter the size of the tire. With a bigger tire it covers more ground which means more miles an hour.

[@williamoliveros76]

Mines is still off

[@othername1000]

My poor speakers

[@perjian1697]

The x4 doesn't connect to wifi

[@middickmotors6019]

Internet is what I meant.