Speedometer calibration
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Junior User
Joined: Nov 2007
Posts: 52
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From: The real NY UPSTATE
Speedometer calibration
I need to know how to recalibrate a speedometer in '05 SD to account for a change in tire size. Can it be done by a shadetree guy or is it a dealer job?
I had a '92 E150 that could be calibrated by entering a diagnotics mode and then enter the tire revs per mile spec. Fast and easy. Probably not the same anymore!
I had a '92 E150 that could be calibrated by entering a diagnotics mode and then enter the tire revs per mile spec. Fast and easy. Probably not the same anymore!
Cargo Master
Joined: Aug 2005
Posts: 2,051
Likes: 1
From: Alberta, Canada
I have a truspeed as well and find it works very well. Lets me use any size tire I want. Holds two settings at once so if you have two sets of wheels like I do you can switch between them with a flick of a switch without recalibrating.
Postmaster
Joined: Jan 2005
Posts: 4,743
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From: Peoria, IL
Depends on what size tire you are talking about. The Ford PCM will only recognize revolution per mile numbers greater than 600, which is equivalent to about a 35" tire. So if you are going with tires smaller than 35" have your dealer update the PCM (or do it yourself with a programmer, but only some programmers can do this).
If you are going with tires larger than 35" you will need a device like the Superlift TruSpeed that the others mentioned.
If you are going with tires larger than 35" you will need a device like the Superlift TruSpeed that the others mentioned.
Senior User
Joined: Feb 2006
Posts: 396
Likes: 2
These guys are all correct. The ford dealer can only do approx a 35" tire.
The in line box these guys are talking about is well known, it has been around for a long time. However, there are other ones out there that in my opinion are easier to use and are more robust. Technology has come a long way, digital electronics components is where it is at now, not turn pots.
All of the inline devices work about the same, however there is only one that I know of that the user actually provides a user interface. Also on the one I speak of the correction can be done accurately while parked instead of trying to tune it in while driving and such.
Kenny
The in line box these guys are talking about is well known, it has been around for a long time. However, there are other ones out there that in my opinion are easier to use and are more robust. Technology has come a long way, digital electronics components is where it is at now, not turn pots.
All of the inline devices work about the same, however there is only one that I know of that the user actually provides a user interface. Also on the one I speak of the correction can be done accurately while parked instead of trying to tune it in while driving and such.
Kenny
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