Speedometer fix for 37s and SCT

[Mikeyfitz]

Anyone have a fix yet? Hate that it's off by 4+ after 70mph. SCT x4 with PIP Tunes.

 

[78f100]

Will it let you change revs per mile? I can't remember on their tunes if you can change it or not.

 

[Mikeyfitz]

Only options are like 26" to 34" tires. Then gear changing and that's about it. No revolutions per mile like every other ford I've had lol

 

[PowerStrokePops]

Hyper tech speedo calibrator and set the tuner parameters for tire size back to stock levels. I was running one before I decided to get the Livewire from IDP.

 

[Captaincworley]

I'm not sure I understand the options they do have. 26" to 31" are basically useless for our trucks. If I remember correctly on other Vehicles they had tire size all the way up to 40" +.
What gears do you have in your truck?

 

[Mikeyfitz]

I'll look into hypertech for sure.

Nah options are just some lower number to 34". I have 3.55s

 

[Captaincworley]

You could change your gear ratio to 3.31's in the tuner with 34" tires. That should get you a little closer if you haven't tried that yet. I had to do that before with a different truck.

Charles

 

[Captaincworley]

I'll look into hypertech for sure.

Nah options are just some lower number to 34". I have 3.55s

I was referring to GM tuners being able to to go all the way up to 40" Lol.

 

[Mikeyfitz]

I thought about that but wasn't sure with shift points n stuff

 

[Captaincworley]

I'm not sure if these trucks go by MPH or by RPM as far as the shifting goes. If it goes by MPH, It should actually be better because you will be a little closer to the correct MPH. If it goes by RPM you should still be good as the gear ratio change in the tuner shouldn't mess with your actual RPM, only your MPH.

 

[Mikeyfitz]

I may give it a try! If all else fails I'll buy that hypertech.

 

[PDT1081]

You could change your gear ratio to 3.31's in the tuner with 34" tires. That should get you a little closer if you haven't tried that yet. I had to do that before with a different truck.

Charles

You do realize the speed sensor counts the rotations of the carrier? Doesn't matter what gear ratio you put in it, it's still going to count how fast it actually rotates. It's not like the old cars where the speed is measured in the transmission.

 

[Captaincworley]

You do realize the speed sensor counts the rotations of the carrier? Doesn't matter what gear ratio you put in it, it's still going to count how fast it actually rotates. It's not like the old cars where the speed is measured in the transmission.

I did not, However I do now

OP I guess you are back to Square 1 now lol. Hypertech it is!

Charles

 

[Mikeyfitz]

Damn, or going with a ******* tuner once they release the new ones lol