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Old 03-24-2019, 08:20 AM   #51
240wagonguy
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The GM DRAC also converts from an analog signal to digital. The Volvo speedo gets the analog input from the sensor directly.
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Old 10-28-2019, 09:07 AM   #52
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Did anyone ever figure this out? I'd also like to keep my ABS in my 93 classic.
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Old 10-28-2019, 09:25 AM   #53
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My 8.8 is still sitting in the garage. The Volvo axle hasn't blown up... yet.
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Old 10-28-2019, 09:30 AM   #54
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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.
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Old 10-28-2019, 11:01 AM   #55
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Quote:
Originally Posted by bobxyz View Post
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.
I usually see a sensor above and behind the pinion flange, but reading the tone ring next to the ring gear. Usually 108 teeth.
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Old 10-28-2019, 11:19 AM   #56
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Quote:
Originally Posted by 240wagonguy View Post
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.
I read that it was bouncy. I would imagine that would cause the ABS unit some issues.
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Old 10-28-2019, 12:46 PM   #57
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Likely because of unevenly spaced teeth, 130/48 means you cut off every 2.7 tooth on the wheel. Obviously not gonna work well. Best to fab a new wheel with 48 evenly spaced teeth.

Could also cut a wheel that bolts onto the driveshaft flange. You'd have to divide 48/ the gear ratio to get the correct teeth, and make a bracket to hold the volvo speed sensor.

I'm just throwing out ideas I've had recently to get the speedometer working in my welded diff car thats missing the tone wheel. I was gonna try to run it off a front ABS sensor but obviously your ABS would have to be decommissioned, mine already has been.
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Old 10-28-2019, 03:10 PM   #58
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I just counted 3 tone rings on 8.8 explorer/mountaineer diffs. two had 4-link, one had leaf springs.
108 teeth, 8.3"-ish" dia.

The ones with low tooth count are usually mounted at the hub or outer axle, 3.6-4.5".

https://www.yukongear.com/partslist....gs+%26+Sensors
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Old 10-28-2019, 11:06 PM   #59
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I emailed a couple places about custom tone rings.
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Old 10-29-2019, 07:07 AM   #60
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If it helps the price, I will get one.
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Old 10-29-2019, 09:16 AM   #61
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I'll try and keep tabs on this, I'm in for 2 I reckon
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Old 10-29-2019, 10:14 AM   #62
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Originally Posted by jjona5 View Post
I emailed a couple places about custom tone rings.
Same here. If its a reasonable price I'd be interested in getting a good speed reading from the rear diff so I can possibly use it for a traction control system and front ABS strut.
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Old 11-10-2019, 07:37 PM   #63
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emailed a few places. need to get an 8.8 tone ring to send them.

Last edited by jjona5; 11-10-2019 at 08:49 PM..
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Old 11-10-2019, 09:29 PM   #64
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Is there a reason you can't use an electronic pulse-counting converter, is the signal more complicated than simple pulses?
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Old 11-13-2019, 03:41 AM   #65
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Quote:
Originally Posted by jjona5 View Post
I emailed a couple places about custom tone rings.
Let us know if anyone seems sane; been buying from reluctorrings.com in the UK. Quality product, but not cheap, and even less so with shipping to California.
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Old 11-13-2019, 03:43 AM   #66
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Originally Posted by Forg View Post
Is there a reason you can't use an electronic pulse-counting converter, is the signal more complicated than simple pulses?
It becomes quite ... exciting keeping the output duty cycle right, especially if you're trying to make an ABS system happy.
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Old 11-14-2019, 08:56 AM   #67
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I wonder if we could just do the math and get a rear tire that is 2.08 percent larger than the front and call it a day 49 vs 48 tooth.
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Old 11-20-2019, 10:35 PM   #68
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Quote:
Originally Posted by jjona5 View Post
emailed a few places. need to get an 8.8 tone ring to send them.
Where am i mailing this tone ring?
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