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200 Series General Forum for the Volvo 240 and 260 cars |
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Speedometer solutionsViews : 736 Replies : 2Users Viewing This Thread : |
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Jun 5th, 2015, 15:26 | #1 |
Junior Member
Last Online: Mar 11th, 2023 09:02
Join Date: Mar 2014
Location: Ashford
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Speedometer solutions
OK, so I have fitted a G80 into my 1031 axle and have come across an obvious problem and one that on the face of it should have a simple solution.
Mine had an electronic speedometer which took it's signal from a 12 gap tone ring on the diff, sensor in the steel diff cover. The G80 has a 48 gap tone ring which must also do the ABS in the 940 it was born in. Great, cut every three teeth out and you have 12 teeth and 12 gaps. I've carried over the 940 aluminium diff cover with the 940 sensor and instead of getting a 75% reduction in pulses and a correctly reading speedo I'm reading high, probably not 4 times as high but with a distinct rise and fall on the needle at low speeds. a) Does anyone know how different the sensors are, i.e. they both appear to be two wire variable magnetic reluctance sensors and not hall effect (three wire) but is there something special about the 940/ 48 tooth type that I'm missing I'm a bit foxed as to why the reading is high as I am missing a load of teeth unless it is picking up the background steel and not getting a nice clipped signal. The 12 tooth tone ring doesn't have a diff right behind it b) anyone have any other great work arounds before I start adding 12 tooth wheels on the prop? |
Jun 7th, 2015, 11:15 | #2 |
Not an expert but ...
Last Online: Apr 26th, 2024 12:45
Join Date: Dec 2001
Location: Boncath
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As you now have the number of teeth approriate for a 240, why not use the 240 cover and original sensor?
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Jun 7th, 2015, 23:01 | #3 |
Junior Member
Last Online: Mar 11th, 2023 09:02
Join Date: Mar 2014
Location: Ashford
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Cheers, I will try this, hopefully the depth that the two sensors protrude in is the same. My concern now is that the sensor was reading too much diff and not enough air.
Really kicking myself for cutting up the 48 tooth tone ring now. That was at least reading 4 times too high nice and cleanly! |
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