speedometer is off need help
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Mountain Pass
Joined: Aug 2011
Posts: 115
Likes: 2
speedometer is off need help
I have a 2013 Ford F-150 4x4
I have a 6" lift
20" wheels with 325/60R20 tires
My speedometer is off by 5mph at 60 mph
when my speedometer is showing 60 mph it is really doing 65 mph
been to the ford garage and they tried to calculate thru the computer but it wont help at all
Does anybody have any help to try and get this closer to the speed it should b Thanks
Hope I have enough info for yas
I have a 6" lift
20" wheels with 325/60R20 tires
My speedometer is off by 5mph at 60 mph
when my speedometer is showing 60 mph it is really doing 65 mph
been to the ford garage and they tried to calculate thru the computer but it wont help at all
Does anybody have any help to try and get this closer to the speed it should b Thanks
Hope I have enough info for yas
Elder User
Joined: Jul 2010
Posts: 501
Likes: 1
From: Pacific NW
I had the same experience when I tried to re-flash the tires size on my F-150. Unfortunately there is no way to do this through OEM means. Either you live with the inaccuracy or you'd have to consider going with an after-market tune to update your speedo.
Laughing Gas
Joined: Dec 2010
Posts: 1,200
Likes: 45
From: Timbuk3, MI
The closest that a FoMoCo dealership PCM flash would be 607 - 315/70x17 (Raptor wheel diameter - 34.4").
Your 325/60x20 has a diameter of 35.4" (2.9% fast - 60MPH speedo' = 58.3MPH actual).
BTW ... Standard non-Raptor wheel diameter is ~32" (+- .1")
IDS ( IntegratedDiagnosticSystem ) - Standard, OEM Tire Size (PCM)
------------------------------
-click- the pic'
Goth 150
< This space intentionally -blank- >
Your 325/60x20 has a diameter of 35.4" (2.9% fast - 60MPH speedo' = 58.3MPH actual).
BTW ... Standard non-Raptor wheel diameter is ~32" (+- .1")
IDS ( IntegratedDiagnosticSystem ) - Standard, OEM Tire Size (PCM)
-click- the pic'
Goth 150
< This space intentionally -blank- >
Thread Starter
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Mountain Pass
Joined: Aug 2011
Posts: 115
Likes: 2
Thanks for the replys folks
gDMJoe that is the one they used 607 and it is still off by 5mph @ 58mph on the speedometer it is really doing 63mph so is there any other suggestions out there folks
gDMJoe that is the one they used 607 and it is still off by 5mph @ 58mph on the speedometer it is really doing 63mph so is there any other suggestions out there folks
Thread Starter
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Mountain Pass
Joined: Aug 2011
Posts: 115
Likes: 2
Ok Im new with these tuners guys been looking at them on the net.
Can u get one just that will do the speedometer, and do u have to spend alot of cash to get one Thanks again
Can u get one just that will do the speedometer, and do u have to spend alot of cash to get one Thanks again
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Posting Guru
Joined: Sep 2006
Posts: 1,392
Likes: 1
From: Dayton, TX
hypertech speedo calibrator
Hypertech Speedometer Calibrator
BUT... might as well spend a few extra bucks and get a full tuner out of it with this
5 Star Tuning | Custom Dynomemeter Chassis Tuning Products and Services
Hypertech Speedometer Calibrator
BUT... might as well spend a few extra bucks and get a full tuner out of it with this
5 Star Tuning | Custom Dynomemeter Chassis Tuning Products and Services
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