Hi All;

Having trouble with the reliability of my speedo sensor .. Currently aimed at two magnets on the gearbox end of the propshaft. Only place I can use since I have a live-axled car ..

However, I have always knowon there's a lug (M6 thread I believe) on the Escort hub carrier that would allow a sensor to be directed straight at the back of the front wheel studs .. But, it is quite a long sensor that would be needed to get close enough.

Can anyone advise if a suitable sensor exists that can be mounted here? .. Or share any other methods used for mounting here ??

Kind Regards

I always thought 2 magnets wasnt enough, mines got 4!

That maybe your issue, the sensor cant read 2 quick enough?

The amount of magnets shouldnt effect it as long as you can adjust the speedo across a good enough range. In fact more magnets means the system must have a higher read rate but i doubt this is the issue it more likely a weak magnetic coupling with the sensor. Does the speedo drop out at high speeds or at random.
I had an issue with mine at high speeds and it was due to the distance being too high.

Is the sensor mounted on the gearbox as it will obviously move around a bit as engine loads change and that could be the problem.

Not aware of any long sensors for the front but etb do a small one (m8 thread) that you could easily extend but whatever you do it needs to be stiff as its the wrong side of the suspension.



I could probably send you some larger magnets (use rare earths at work) if you want to try that. If so i can have a look what we have when im in next week.u2u me if you want some.

Regards pete

Hi
We made up 4 stainless steel fingers drilled each
end one end with socket cap screws & nyloc nuts
Shakeproof washers & threadlock to the prop bolts
The socket cap bolts were exactely the right size for
the little round magnets supplied by Koso ( speedo)
araldited them in as well.
This was fitted to the back of our reversing box
But I see no reason not to do it at the axle end of the prop.
Good luck
René


Speed sensor

my car has just one sensor magnet fitted to the rear of the front brake disk and it works fine, i have covered over 20000 miles with out problems and my speedo is calibrated to within 1/10 mph

the sensor on my car is a micro reed switch, these are glass and very fragile they work best "end" on to the magnet and i have found the 3 wire reed switches to be better (use the N/O connection)
this is because the sensor itself has failed despite being very securely mounted on the car and has had more than one site to reduce the problem. a new sensor from the manufacturer was listed at £18 plus postage.....my reed switch replacement cost 40p and has lasted longer. the original sensor failed at about 2000 miles the sensor i made at first broke after the same distance but the sensor i replaced with a 3 wire reed switch has lasted over 16000 miles with out trouble.

Hi Snowy2;

Can you tell ne where you got the sensor from please?

I can't use the axle end of the prop as it's a live axled car .. Only other option is to crete a bracket attached to the gearbox via the gearstick bolts. That will remove a lot of the relative movement as I currently have it on a bracket fixed to the tunnel.

Im sure there's a sensor out there I can use on the front wheel, so want to follow that if I can.

Cheers for all the input so far !! ..

The diff end is the better end of the shaft to use, the gearbox end of the shaft moves in and out on its' spline

If you are using an english axle there is a 'hood' in the casting over the input shaft/pinion shaft. You can drill and tap this (carefully, obviously). Or point a welder at it?!