Speedo Change...
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From: Deep'n the Heart of Texas
Speedo Change...
I just bought a set of 17" wheels & tires off of a 2003 Expedition 
and will soon be swapping out my stock 235/70/17's and wheels for the new 265/70/17 that I bought. The height is different and therefore my speedo will be off. I know there is no speedo gear but how does the dealer compensate for wheel changes? Is it in the ECU or is there relacement part that I need to buy to get my speedo back?
Also... I am in need of a set of center caps for these wheels. Anybody got some they want to sell?
Russ Rogers
and will soon be swapping out my stock 235/70/17's and wheels for the new 265/70/17 that I bought. The height is different and therefore my speedo will be off. I know there is no speedo gear but how does the dealer compensate for wheel changes? Is it in the ECU or is there relacement part that I need to buy to get my speedo back? Also... I am in need of a set of center caps for these wheels. Anybody got some they want to sell?
Russ Rogers
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From: Hockley, Tx.
Originally Posted by rus_rog
I know there is no speedo gear but how does the dealer compensate for wheel changes? Is it in the ECU or is there relacement part that I need to buy to get my speedo back?
Yeah right
Hey Dusty...anything in your shop manual about this?
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From: Deep'n the Heart of Texas
Something about 'tinkering' and my new truck
just don't mix... Hopefully some of the sharp minds on the site will have something to offer us...
Later,
Russ Rogers
Ft Worth TX
Later,
Russ Rogers
Ft Worth TX
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From: greenland
ford has a computer made especially for them that plugs in to every ford and you can re-calibrate your computer fot the correct revolutions per mile it can also shut annoying things off loke the seat belt minder auto locks without going through the procedure yourself 
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From: Platte County
I just posted something like that on another site asking kind of the same thing. I want to ditch my 17 inch wheels and put a set of the 18 inch FX4 wheels on mine and was kind of wondering how much work the speedo will be.
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Here is link that someone posted earlier that shows the effect on the speedometer of changing wheel and tire sizes.
http://www.csgnetwork.com/speedocalibcalc.html
http://www.csgnetwork.com/speedocalibcalc.html
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From: Hockley, Tx.
Originally Posted by brown1275
Here is link that someone posted earlier that shows the effect on the speedometer of changing wheel and tire sizes.
http://www.csgnetwork.com/speedocalibcalc.html
http://www.csgnetwork.com/speedocalibcalc.html
Thanks brown...that one is much easier to read the results than the one I have been posting to people. I like how you can also enter different speeds. Very helpfull indeed
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This topic keep scoming up and Hypertech is happy because it gives them one more excuse to sell their gadgets. Fact is: The manufacturers are required by law to calibrate their speedo so it accommodates different tire and wheel sizes within a specific precentage range. You do not need to recalibrate your speedo for this. The result would be that it has the same level of accuracy as it has right now, plus or minus x%
Some people will spend money on anything...
Some people will spend money on anything...
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Mmmmhh...I thought I did.
Forget about the legalities.
Look at rus_rog 's example. He went from 235 to 265 on 17. It translates to a variation for the speedometer from 70mph to 73mph, that's between 3% to 4%. Standard variance on speedometers is probably at a conservative 5% if not more (that is 5% either way, +/-).
Exactly what do people think they are calibrating?
Forget about the legalities.
Look at rus_rog 's example. He went from 235 to 265 on 17. It translates to a variation for the speedometer from 70mph to 73mph, that's between 3% to 4%. Standard variance on speedometers is probably at a conservative 5% if not more (that is 5% either way, +/-).
Exactly what do people think they are calibrating?
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