SCT Livewire is NOT correcting Speedometer
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Senior User
Joined: Feb 2013
Posts: 252
Likes: 5
SCT Livewire is NOT correcting Speedometer
I just purchased 20"lariat wheels for my 2015 xlt f350 super duty. Which are all OEM including the rubber. The tire size did increase. I was hoping the livewire ts tuner would correct the speedometer but it did not. I compared it to my gps and my phone. Have tested it before i changed the tires and everything matched. I have already reached out to 5star tuning about this. Has anyone ran into this issue?
Laughing Gas
Joined: Jul 2012
Posts: 1,210
Likes: 20
From: prince george, bc canada
I just bought an 08 with the 6.4 that was rolling on 37s. It also has an SCT tuner. The speedo was out by 20kmh! I ditched the 37s for some 35s and then adjusted the revolution per mile setting in the tuner. I was now out by about 7kmh. That could be because of the tire swap? I did another adjustment but haven't driven the truck yet to see if it changed. I have been searching the net about this. Some people say it does adjust speedo others say it only adjusts tranny shifting based on tire size! I don't know the answer yet.I have an SCT livewire TS 5015.
Junior User
Joined: Feb 2015
Posts: 51
Likes: 0
From: West Texas
Same issue here, I have been playing with different tire settings, and axle ratio settings. The closest I have gotten it was for 315x70x17 tire and 3.73 axle was 2 mph slow on on speedo, using the settings 3.55 axle and a 34.4" tire. But it seems my truck start shifting hard and the tranny gets confused what gear it's in... so I switched it back to the 3.73 axle and 34.4" tire and at 75mph it's off by 5mph slow.
Laughing Gas
Joined: Jun 2011
Posts: 1,223
Likes: 89
From: TN
Same here. The SCT tuner did not correct my speedo in any fashion I tried. I went up in tire size and that did it.
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Laughing Gas
Joined: Jul 2012
Posts: 1,210
Likes: 20
From: prince george, bc canada
good to hear!!
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Junior User
Joined: Feb 2015
Posts: 51
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From: West Texas
Awesome, I'm glad someone bit the bullet and called them haha. Now let's see if they make good on it.
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