J_Jones
Active member
- Joined
- May 1, 2005
- Location
- Lincolnton, NC
I've had an 8.8 in my '91 240 for years now. Cut/grinded the teeth off of the 8.8 wheel to get to 12 and then spliced in the 8.8 sensor. Little bouncy up to 20 and then solid.
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I've had an 8.8 in my '91 240 for years now. Cut/grinded the teeth off of the 8.8 wheel to get to 12 and then spliced in the 8.8 sensor. Little bouncy up to 20 and then solid.
Thats exactly what I did but mine is bouncy in a lot of places up to about 50. Did you just barely grind away the teeth or knock down the ring farther.
I want it for abs. the dash speedo working is nice too, but I mainly want it for the abs.
Expensive is relative
I used an angle grinder with cutoff then grinding wheel to make it as smooth as possible and equal to the troughs in between the remaining teeth. I'm guessing the imprecision of the angle grinder is why my speedo bounces.
There was a discussion about this on the facebook group, and I know John (Giffins Performance) had drawn up 48 and 12 tooth wheels for the 8.8, he sent me the drawings. I don't know if he cut any prototypes yet. If you have an 8.8 in a car already, it's worth sending him a message about testing one.
I usually see a sensor above and behind the pinion flange, but reading the tone ring next to the ring gear. Usually 108 teeth.I looked briefly at the DRAC and I don't think it has enough range to convert from a 8.8 VSS to 240 ABS/Speedo.
The 240 ABS and Speedo expects a 48-tooth ring off the axle. A 205/60R15 tire gets 817 rev/mile. Multiply this by 48 and you get 39216 pulses per mile. The number on the face of the 240 speedo is the calibrated PPM, e.g. 39200.
If I understand correctly, the 8.8 is normally a 40-tooth sensor off of the driveshaft. With a 3.73 diff, and the same tire as above, this results in 817 * 3.73 * 40 = 121896 PPM, or roughly a 3x higher rate than what the 240 ABS/speedo needs.
The DRAC is a PLL based frequency converter. From the "input ratio" charts, it can rescale with a frequency multiplier of 0.5 to 2.0, based on the jumper settings. This isn't enough range -- the 240 speedo would need an "input ratio" of 3.0. This is off the charts of the available jumper settings.
Seems to me the solution is already in here on page 2. Cut a new reluctor ring or modify the one in the axle, and use the ford abs sensor. Several members reported success.