Speed Calculation w/ 32's - Ranger-Forums - The Ultimate Ford Ranger Resource


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  #1  
Old 12-20-2007
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Speed Calculation w/ 32's

It doesn't look like I am going to have my tuner reset by the time my 32's are installed, so how far off will my speedometer be. Currently running stock tires and the new tires are 32's.

Thanks for the help!
Mike


p.s. I did search.
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Old 12-20-2007
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not by much...i've read 1.2 mph difference between 30s vs. 33's. Been so long since my 32's got put on...I don't remember what the differnece was.
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Old 12-20-2007
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if you have the xcal2 you can go in and change the revolutions if i remember right that what bill did..

you would enter 656rev

your stock 30's are 705...
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Old 12-20-2007
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wont be to much... mine from 27s to 30s is only off by 1mph at 50 and 5mph at 70
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Old 12-20-2007
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your really worrying way to much about this i went from my what 26 or 27 tall tires to 32's for over 2-3 years before i changed my speedo gear...
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Old 12-20-2007
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ruffly 4 mph differance at 60 mphs
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Old 12-20-2007
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I have an X-Cal 1, so I can't redo it, I will have to send it in to someone to get retuned.
Zach, I'm not worrying, just wondering.
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Old 12-20-2007
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I personally think its more accurate the way it is now. I have adjusted my speedo with the xcal and everytime I passed one of those speed signs they clocked me 10% slower than I was going. When I set my speedo to stock with 32s the speed signs have always been fairly accurate.

To answer your question though, I have noticed about a 10% change in the speedomoter readings (basing it RPMs).

Last edited by TommyC; 12-21-2007 at 02:00 AM.
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Old 12-20-2007
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When I'm doing 50 on my speedo I'm really doing 55.
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  #10  
Old 12-20-2007
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When I went to 33's, my speed-o was dead on.
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Old 12-20-2007
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When I went to my 285's, my speedo says 70mph when I am really going 74mph. I was drinving by a speed sensor on cruise control.
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  #12  
Old 12-21-2007
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try this link

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