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Old 01-20-2015, 08:58 PM   #26
Andrewhans
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Quote:
Originally Posted by JW240 View Post
The speedometer is controlled by a ITT UAF2115 chip. This chip is used in many cars of the same era, including the 7/900 series.
There is a calibration resistor in the cluster that will alter the speed shown by the meter. The trip/mileage counter calibration is not affected by this resistor.
That was the statement I went off of. I think the signal come into the speedo and then is split up between the odo/trip and the speedo. The resistor being adjusted is on the speedo side of things, the UAF2115 chip side of things.

That's how I understand it, but you are absolutely right if you can intercept/change that signal before it hits the cluster then everything would work perfect, the cluster wouldn't know any different
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Old 01-21-2015, 08:14 PM   #27
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Lots of good ideas here. I have no clue of which route is best for me, but like everything else I've done I'm sure I'll figure something out.
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Old 01-21-2015, 08:24 PM   #28
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There are more than plenty teeth to grind off to get the count you need. Had to do this with my electronic speedo. The tone ring in the exploder 8.8 gives too many pulses per mile for most aftermarket speedos.
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Old 01-23-2015, 08:15 AM   #29
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/\ this is true as well. I don't know if the converter will work for this either. I haven't seen the numbers.
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Old 01-23-2015, 10:23 AM   #30
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Do all 240's have an electronic speedo ? My plans to put an 85 240 turbo motor and tranny in a 122 meet another wrinkle cause the cluster from a 140GT I've planned to use is cable driven. It was accurate in a 220 wagon with a 4.56 rear.
The new tranny is, I believe an M47 , no switch on the shifter but a 5 speed diagram. Is there possibly a speedo gear on the tail shaft? Haven't brought it home yet, just the 122.
I'm new, guys, should I have asked this in a new thread?
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Old 01-23-2015, 10:37 AM   #31
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Just 86+ 240's. Earlier cars had cable driven speedometers.
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Old 09-16-2018, 11:54 AM   #32
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Gonna bump this up. Im at the point where Im doing the 8.8 swap and have a question.

8.8 explorer sensor. Does the polarity matter when connecting it to the Volvo 240 wiring? Ive already modified my tone ring down to 12 teeth and just need the driveshaft modified and then its time to drive the car again.
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Old 03-06-2019, 10:12 PM   #33
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curious how that modified tone ring work out for you? I'm about to do a 8.8 swap on my 92 and want to keep the abs.
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Old 03-07-2019, 12:28 PM   #34
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I'm not sure yet. Speedo worked just fine on the Volvo tone ring but the modified ring only read accurate and smooth from 70mph to about 110mph. Below that and it reads about 5mph high and bounces around a lot. Above 110mph and it just kind of hangs and doesn't climb any more.

Not sure if my speedo is having an issue or if I need to modify the tone ring more or change sensor. It's a weird result honestly and I didn't expect it.

In this video you can see the needle hovering around 110 or so even though I was doing 140 at the end of the pass.
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Old 03-07-2019, 12:35 PM   #35
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anyone ever make a 48 tooth wheel for the 8.8?
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Old 03-07-2019, 01:51 PM   #36
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I don't think so after a little google searching.

I'm wondering if the sensor output is being weird even though its a 12 "window" setup like the factory Volvo speedo is used to seeing. One thing I can think of is that the material I removed wasn't enough and the sensor is picking up the mass of the ring a little and throwing it off.
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Old 03-07-2019, 02:42 PM   #37
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There was a similar thread not all that long ago where someone linked to a site that makes custom tone rings.

Other than that, there are stock 49 and 50 tooth rings, but they fit different flavors of the 8.8.

I actually ended up buying the 8.8 axle volvowagoon was talking about in the original post, I still want to put that in the 245 at some point and keep ABS working properly, as well as speedo/odo.
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Old 03-07-2019, 09:57 PM   #38
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It was me posting about tone rings. They're expensive, you don't want to go there.

Use the Dakota unit, or if you are really cheap, you can almost certainly convince a GM DRAC module to do what you want.

Keeping ABS will be harder, but still doable - the challenge will be getting the signal out of the converter to look enough like the signal from the pickup so that the ABS unit is happy with it. The DRAC is more likely to help there, but you'll still be doing some fiddling with resistors.
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Old 03-08-2019, 12:14 PM   #39
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I want it for abs. the dash speedo working is nice too, but I mainly want it for the abs.

Expensive is relative
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Old 03-08-2019, 12:17 PM   #40
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I think I'd figured out a pretty even pattern of grinding teeth out of the 130 tooth ring to arrive at 48 teeth.
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Old 03-09-2019, 02:07 PM   #41
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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.
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Old 03-10-2019, 02:46 PM   #42
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Quote:
Originally Posted by J_Jones View Post
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.
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Old 03-11-2019, 08:19 AM   #43
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Quote:
Originally Posted by Andrewhans View Post
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 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.
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Old 03-11-2019, 09:30 AM   #44
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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.
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Old 03-11-2019, 07:39 PM   #45
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Quote:
Originally Posted by linuxman51 View Post
I want it for abs. the dash speedo working is nice too, but I mainly want it for the abs.

Expensive is relative
Three rings to fit the stock 240 axle under the parking brake was ~US$300 including shipping from the UK.

They needed measurements accurate to a couple of thousandths, as you heat the ring to get it on. Might be easier / cheaper since what you're doing has almost certainly been done before, and our job was 100% custom.

Reluctorrings.com
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Old 03-11-2019, 09:30 PM   #46
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After putting a Honda Civic manual transmission in my Insight, I notice the speedo was 10% off, so I used an Arduino Uno to correct my speedo since there are no correct count speedo gear available.

VSS goes to Arduino Uno, do the calculation, then output the modified signal (5V) to the ECU/Cluster/EPS/climate control.


Works pretty good and I don't see why someone can't get it work for the explorer VSS to the 240 speedo.
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Old 03-12-2019, 05:07 AM   #47
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You could always remove the resistor on the volvo electric speedo & solder in a pot - can move the speedo how you like then.
Dave Bartons site has full info - so easy even I could do it. Just don't use the cheap chinese variable resistors - they're too variable in their variableness.
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Old 03-18-2019, 09:29 AM   #48
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Quote:
Originally Posted by J_Jones View Post
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.
That's exactly what I did too. Mine bounces a round a lot. I'm wondering if I have it wired wrong or something. Going to dig into more once it's up and running again.

Quote:
Originally Posted by 240wagonguy View Post
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'm gonna shoot him a message. That's not a terrible idea.
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Old 03-23-2019, 02:21 AM   #49
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Just a couple pointers to documentation on the DRAC as a way of handling this. Will require a little soldering...

http://www.someotherplace.com/info/c...p/cluster.html
http://tbichips.com/?page_id=504
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Old 03-24-2019, 12:58 AM   #50
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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.
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