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Old 08-02-2008, 07:43 AM   #4 (permalink)
bbjsw10's Avatar
Join Date: Jul 2008
Location: Findlay,OH
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bbjsw10 - '91 Geo Metro Xfi
90 day: 51.06 mpg (US)
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What about this option on some cars, a add on hall effect. Put 1-2 magnets on halfshaft close to tranny and mount a hall effect like this one. Only like $3 and would put out consistent readings. Hall Effect Switch | Low Sensitivity | Manufactured by Melexis

And all you would need to know at that point is tire size to know pulse rate.
155/80-12 927 rev/mile
1 magnet = 927/mile
8 magnets = 7416/mile
You could attach magnets to large hose style clamp and strap to inner cv joint case.

Last edited by bbjsw10; 08-02-2008 at 08:20 AM..
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