315's
Thread Starter
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Senior User
Joined: Sep 2007
Posts: 291
Likes: 0
From: COLDWATER On
315's
I know i read somewhere that ford could re flash my pcm to get proper speed readin but the stealership says that they can't, they said they can only adjust it to a 285 tire size.......someone said they had the info to give the ford tech...thx in advance
Lead Driver
Joined: May 2007
Posts: 5,613
Likes: 9
From: Flagstaff, Arizona
it's in the ABS module in the front, I had asked Jody (DP-Tuner) about adjusting it with the PCM, and he can't do it. So it's either take it to the dealer, or buy a Superlift Tru-speed and do it yourself 
Post Fiend
Joined: Jun 2004
Posts: 9,293
Likes: 10
From: Parker, CO
315's are about a 35" tire, or close to 600 revs per mile. The ABS module can recognize down to 601 revs per mile, so a 35" tire is the largest you can program into the system. Your dealership was just too lazy to look up the proceedure.
