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Author: Subject: ETB speedo on Mk2 gearbox speed sensor
Ianboom

posted on 24/2/17 at 02:51 PM Reply With Quote
ETB speedo on Mk2 gearbox speed sensor

Hi

Has anybody on here had a go at connecting up an ETB speedo to a Mk2 gearbox speed sensor?

ETB weren't a lot of help!

My plan is to get the car on axle stands and try to set it up, ideally, I could do with an oscilloscope to help.

Ian

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Ugg10

posted on 24/2/17 at 03:03 PM Reply With Quote
was about to fit my digidash 2 to a type 9 (similar fitting I think).

Revotech do an adapter and then use a puma/fiesta/focus encoder. Encoder pattern and connections are -

Brown - ground, Yellow/Brown - signal, Black/brown - Live (12v/5v)

Signal is an equal square wave with (0-live feed amplitude) and 8 waves per rev.

Note the drive is geared to the output revs of the prop, so need to a bit of experimentation to work out the prop to encoder ratios.

ETB seemed to think that would work.










---------------------------------------------------------------
1968 Ford Anglia 105e, 1.7 Zetec SE, Mk2 Escort Workd Cup front end, 5 link rear
Build Blog - http://Anglia1968.weebly.com

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Ianboom

posted on 24/2/17 at 03:18 PM Reply With Quote
Hi

The MX5 sensor has a 2 wire output, I'm not sure whether it uses ground from the gearbox as I thinks it's a plastic unit.
I wish I'd had a play with it before I fitted the transmission covers (It's fitted to a Westfeild).

Ian

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Ianboom

posted on 28/2/17 at 12:08 PM Reply With Quote
Done a bit of digging.

The MX5 gearbox output is a VR (variable reluctance) sensor which output a squashed sine wave.

I'm in the process of checking, but I think the ETB gauge requires a square wave.If so, I need a signal conditioner.

If this is the case, I reckon I can build one at work.

I'll post what I find.

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Jed

posted on 28/2/17 at 07:04 PM Reply With Quote
The setup posted by Ugg10 is the same that I used on my Midget (4AGE plus type 9) with an ETB electronic speedo. Although the sensor can do 5 & 12v the speedo only worked with a 5v signal.
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Ugg10

posted on 28/2/17 at 07:57 PM Reply With Quote
Sorry, my post was a bit misleading, when you said mk2 I naturally assumed escort not mx5.

Can you not use an etb pickup and use the two magnets on the prop/front or rear hub? Since moving from a type 9 to an rx8 I have converted to this.





---------------------------------------------------------------
1968 Ford Anglia 105e, 1.7 Zetec SE, Mk2 Escort Workd Cup front end, 5 link rear
Build Blog - http://Anglia1968.weebly.com

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Ianboom

posted on 5/3/17 at 08:25 PM Reply With Quote
Sorry!
Mk2 MX5.

I ended up putting one of the signal wires from the speed sensor to ground and the other to the brown wire on the gauge.

This seems to work, I just need to see if the gauge can handle the potential voltage from the sensor.

I had a signal conditioner made up at work, but couldn't get it working!

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