Computer flash for larger tires
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Joined: Jul 2010
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Computer flash for larger tires
I just replaced my stock tires to a larger size (P275/70 to P295/70). I noticed that the computer calculated milage is off. The difference isn't that noticeable but I'd kinda OCD. The Ford dealership wants $100 to flash but won't guarantee that flash will take. I'm willing to pay the money, but not if flash won't work. Does anyone else have a do-it-yourself suggestion?
Fleet Mechanic
Joined: Oct 2008
Posts: 1,321
Likes: 250
From: North Texas
My local dealer quoted me $140 but didn't sound uncertain about it all. It just wasn't worth it to me, so I passed. I have TorquePro app and use GPS for speedo and hand calculate the mileage with the rpm difference in tire size
Token Redneck
Joined: Jun 2007
Posts: 9,335
Likes: 344
From: Breckenridge, TX
Might take some work to get the correct coding for a 2001 or a 2008, but people are working on using FORScan for it:
https://www.ford-trucks.com/forums/1...l#post16787790
i fixed mine with an SCT tuner.
https://www.ford-trucks.com/forums/1...l#post16787790
i fixed mine with an SCT tuner.
Postmaster
Joined: Aug 2015
Posts: 3,146
Likes: 32
From: Maryville, TN
I don't know what year your working on, but I know 11-16, the dealers can only program for available factory sized tires. So you will have to find the closest diameter tire they offered(go with the larger size, it will be close to accurate). I have a friend with the dealer software. I went with the 34.1" 20" tires for my 37's and I'm off by 5%. Close enough for me. Hypertech makes an in line module that goes behind the cluster that will allow for any size tire. I believe it uses revolutions per mile. 5 star tuning sells it for just over $200. Your only other option is like whats been said, get familiar with forscan.
I have no idea what the dealer means by they can't guarantee it to work. It should take them less than 5 minutes and it's stupid simple. Sounds like the service writer has absolutely no clue.
I have no idea what the dealer means by they can't guarantee it to work. It should take them less than 5 minutes and it's stupid simple. Sounds like the service writer has absolutely no clue.
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FarmLaw
1997 - 2006 Expedition & Navigator
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Sep 21, 2004 09:28 AM
