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Nov 14, 2018 20:15:45 GMT
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Hello,
In my alfa giulia i've fitted engine, wiring loom and instruments from an alfa 156 2.4 jtd. All is singing and dancing except the speedo.
The speedometer originally gets a signal from the abs control unit. Since i don't have abs i also lack that signal.. 🤔
I do have a bmw e36 diff in the car that has a toothed disk in it and a sensor for the speedo.
Is there anyone who knows If and how this signal could be modified to get my speedo to work and to read a correct speed?
Many thans.
Remco
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Nov 14, 2018 20:44:14 GMT
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cant help you with that, but do you have pics of the car sounds interesting!
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Nov 14, 2018 20:57:09 GMT
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Nov 14, 2018 21:15:14 GMT
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Yes. Use a Dakota Digital SGI-5E - write up I did here
Takes any input from anything and outputs what your speedo needs!
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Last Edit: Nov 14, 2018 21:17:46 GMT by wightfug
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ChasR
RR Helper
motivation
Posts: 10,189
Club RR Member Number: 170
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Creating abs signal for speedo? ChasR
@chasr
Club Retro Rides Member 170
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That Dakota sounds like the best shout, especially if the ECU needs a speed sensor feed for certain operations.
What's the deal with this car? Tell us more!
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Nov 15, 2018 22:49:17 GMT
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It was an incomplete car with a lot of parts missing. If i didn't do anything with it it would have been cut up for parts. The plan was to make it a daily driver to commute with. To keep running costs low i thought about putting a v6 on lpg in but the lpg conversion would cost a lot and i would have to put a tank somewhere.
I decided putting a diesel engine in would be a better plan. So i started looking for a cheap om605. 4 cilinder diesel was never an option, sounds like curse word. Merc diesel didn't pop up cheap enough but an alfa 156 2.4 jtd did..
I fitted the engine and entire wiring harness together with the steering column and instruments into the giulia.
Gearbox from opel omega v6 with an adapterplate. Rear axle homemade with bmw parts. E30 trailing arms with e28 hubs and shortened axles. E36 diff in a homemade cradle. So now it's got irs. Needed a longer final drive for the diesel powerband. Now it does 100kmh(63mph) at 2000rpm in 5th.
It's running and driving. Engine is on the papers, so all official. Torque is addictive. Pulls quite nice from 100-200. Already seen 210kmh on GPS. Car weighs 1070kg ready to drive. Needs custom remap to get close to 190-200bhp.
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giuliettaevo any idea does your speedo need sine or square wave? I reckon from the age it's sine (analogue) signal and said toothed wheel on the diff (funny system the e36 one, how does it know how to release brake pressure from the single diff signal?!) and fit a hall-effect sensor that generates a voltage when passed over. The E36 one would make sense. However making it read right could be hard, that Dakota unit seems like the perfect solution.
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And if it's digital it's easy enough done too, MK5 Golf wheel bearing slotted over one of the halfshafts and a MK5 sensor to output square wave signal to the Dakota box.
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Nov 16, 2018 14:14:42 GMT
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E36 diff gives only a signal for the speedo. Abs uses it's own sensor.
I have no idea what kind of pulse it needs. It's a 1999 speedo.
The dakota box looks to be the answer, i'll look into that. đź‘Ť
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Nov 16, 2018 18:11:42 GMT
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Apparantly it doesn't work that way. The abs ecu strengthens or modifies the signal from the wheelsensors and sends it to the speedo.
Getting an abs ring and sensor would give me a wrong reading as the tyresize has gone down quite a bit. 🤔Would then still need the dakota digital solution to get it reading right.
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froggy
Posted a lot
Posts: 1,099
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Nov 16, 2018 21:00:40 GMT
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Vauxhall use an orange “109” relay to condition the sine wave output from the abs ring to a square wave for the speedo /engine ecu to read . Saab’s of the 90,s fed the speed signal into the speedo head and had square wave outputs for the engine ecu/cruise control ecu . I run a Dakota pulse modifier on my camper and it’s been trouble free for the last 4 yrs
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