Computer Diagnostics and Tuning Technical discussion on diagnostics and programming of the F-body computers

Are all ABS reluctor rings created equal? :)

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Old Jan 27, 2003 | 12:06 AM
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jimlab's Avatar
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From: Redmond, WA
Are all ABS reluctor rings created equal? :)

Seriously, does an ABS sensor care what the size (diameter) of the reluctor ring is as long as it has the same number of teeth as the original?

For example, let's say you have an ABS reluctor ring with 44 teeth that is 4" in diameter. You decide to move the ABS sensor to a different point (let's say you're swapping in a different axle or something) and the new reluctor ring is 4.5" in diameter. If it also has 44 teeth, does the ABS sensor (and therefore computer) care?

My theory is that as long as the number of teeth are identical, the ring could be 3" in diameter or 6" in diameter. The space between teeth may vary, but since the reluctor ring rotates 1:1 with the axle (and therefore tire), even though the teeth on the larger ring are moving at a greater rate of speed (being farther from the axle centerpoint) they're still passing the sensor at the same rate as the teeth of the smaller reluctor ring.

Does anyone know different?

This is pretty important, because if I can have new reluctor rings fashioned to fit the replacement axles for the swap I'm in the middle of, I can move the ABS sensor inboard, eliminate the smaller and potentially weaker outer CV joints (IRS setup) and use the CV joints that came from the swapped axles, along with a shorter axle shaft.

Basically, I'm swapping an '03 Ford Cobra 8.8" IRS differential into my '95 RX-7 (also originally IRS) and want to eliminate the outer CV joints and hubs of the RX-7 in favor of the larger and stronger pieces that came with my Cobra axles. The Cobra axle has the reluctor ring for the ABS sensor on the inner CV joint, the RX-7 has the reluctor on the outer joint. the Cobra's reluctor is 4.41" in diameter, and has 50 teeth, and the RX-7's reluctor is 4.1625" in diameter and has 44 teeth.

So the $64,000 question is... if I have reluctor rings made to fit the inner axle CV joint of the Cobra in 4.41" diameter, but with 44 teeth, is my ABS system going to throw a sh*t fit?

Thanks!
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