speedometer recalibration
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Lead Driver
Joined: Mar 2006
Posts: 6,255
Likes: 438
From: IL
speedometer recalibration
I had 20" wheels on my 03' F 350 i went back to stock 16". Now when the speedo says I'm doing 55mph, i can pass one of those flashing mph unit in a constuction zone and it says I'm doing 43-45mph. I passed 4 of them on the way home and they all read about the same. So supposedly I'm 10-12mph under what the truck says I'm doing. Is there a way to make it relearn?
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,698
Likes: 2,620
From: SE Florida
No, it doesn't learn anything about that. You have to reprogram it. It takes the right scan tool to be able to set it to the proper value. A dealer of a very good independent shop can do it for you.
Token Redneck
Joined: Jun 2007
Posts: 9,331
Likes: 341
From: Breckenridge, TX
Wheel size doesn't mean anything, the tire size it what matters.
I agree with ^^^. I used an SCT 3015 and a GPS speedometer on my iPhone, turns out using the revs per mile from the manufacturers for my last two sets of tires was close enough to correct I didn't readjust from the book number. Up to 295/70R18 then down to 265/70R17.
I agree with ^^^. I used an SCT 3015 and a GPS speedometer on my iPhone, turns out using the revs per mile from the manufacturers for my last two sets of tires was close enough to correct I didn't readjust from the book number. Up to 295/70R18 then down to 265/70R17.
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WXboy
Brakes, Steering, Suspension, Tires, & Wheels
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Aug 28, 2003 12:05 AM
