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20's + Xcal= How to calibrate Speedo

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Old 6/26/06, 08:05 AM
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20's + Xcal= How to calibrate Speedo
Hey all,
I was wondering if anyone has used the Xcal II to calibrate their speedos for use with 20" wheels. There is a function that allows one to calibrate but you have to know the ratio of rotations????

Any help would be appreciated. I have 285/30s in the rears

Jesse
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Old 6/26/06, 08:59 AM
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26.7" diameter vs. stock of 27.25"

IDK about your tuner, but I'll part with that bit of info that I DO know.
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Old 6/27/06, 07:55 AM
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I wonder if I even need to adjust it then?
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Old 6/27/06, 11:01 AM
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your speedometer will read 75, actual speed 74
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Old 6/27/06, 11:13 AM
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Rgr, so it will rack up miles faster as well right?
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Old 6/27/06, 03:40 PM
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Find out the revs/mile on your rear tires from the manufacturer. Then add that number on your tuner under the corresponding setting.
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Old 6/27/06, 05:34 PM
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http://www.discounttire.com/dtcs/infoTireMath.dos

778.15 revs per mile
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Old 6/28/06, 12:59 PM
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Try this out you can fill it in w/ stock info (235/55-17 ) and cross ref it with any size.

http://www.miata.net/garage/tirecalc.html
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