RazMan
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| posted on 7/2/06 at 05:10 PM |
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Where have you mounted your speed sensor?
My Evodash needs a speed sensor mounted somewhere. After discovering that my Duratec has one on the gearbox, I decided that it might be better mounted
on the front wheel - no wheelspin to mess up the readings for 0-60 times, datalogging etc.
I would interested to see how people have mounted theirs. I was thinking about drilling the Cortina upright to accept the sensor (which is M10 I
think) and using the hub bolts as the 'trigger'.
Any other ideas?
[Edited on 7-2-06 by RazMan]
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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donut
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| posted on 7/2/06 at 05:42 PM |
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I put mine on the prop shaft...well the magnets anyway!!
Andy
When I die, I want to go peacefully like my Grandfather did, in his sleep -- not screaming, like the passengers in his car.
http://www.flickr.com/photos/andywest1/
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gingerprince
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| posted on 7/2/06 at 06:55 PM |
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You don't want to have it mounted on a wheel, as said above the propshaft is a much better place for it. Think about it this way: -
If you're going round a right-hand corner at 50mph, and you have the sensor on a left wheel, your speedo may read e.g. 60mph - this is because
the outer wheels travel further and therefore go faster. At the same time the inside wheels will be going at 40mph. (the differences aren't
accurate but you get the idea).
Now, if it's on the prop shaft, then it'll usually be an average value of the left and the right wheels, which will give a more accurate
representation of the actual speed.
HTH,
Sy
[Edited on 7/2/06 by gingerprince]
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chriscook
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| posted on 7/2/06 at 07:06 PM |
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If you want to do it properly then you should have one on each of the front wheels and average them 
I sandwiched a trigger wheel between one of my diff output flanges and its lobro joint.
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mad-butcher
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| posted on 7/2/06 at 08:02 PM |
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it's not the horrible brass thing is it about 5/8 thick and about 4 inches long is it. I tried one of them but it was to big and awkward to
mount so went for the 6 magnet system the pickup is about 1/4 diam and about 1 1/2 inches long mounted on rear upright theres a pic in the MK blade
section of my photo archive
regards
tony
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Surrey Dave
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| posted on 7/2/06 at 08:14 PM |
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Used the big Brass thing, mounted it on a bracket mounted on the 3 gear lever bolts, then I made a toothed washer about 3" diameter, and spot
welded on the propshaft in front of the forward UJ.............
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RazMan
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| posted on 7/2/06 at 09:18 PM |
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Sorry, I should have mentioned that my car is a middy so no propshaft So a wheel pickup is my only option unless I resort to the speed sensor on
the gearbox (if its compatable)
Yep, its the huge brass thing and it really is a pain to find somewhere right for it. There are no magnets involved though so I suppose it could be
worse.
If I drill out one of the tapped holes on the upright that would have been for the splash plate, I should be able to wind in the M10 sensor to within
a couple off mil from the hub bolts ...... but I'm worried it will weaken the upright with such a large hole. Maybe I ought to use the gearbox
sensor after all  The MK one sounds like a much better option although it is a different kind of (magnetic) sensor so will it be compatable?
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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flange nut
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| posted on 7/2/06 at 09:45 PM |
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If I remember correctly fitting the speed sensor to the front wheel is a bit of a no unless you have a certificate showing the accuracy of the speedo.
This is because the SVA tester can't check the speedo during the test. The gearbox output would be the best way to go. Give the manufactures a
ring they can probably help.
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RazMan
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| posted on 7/2/06 at 09:53 PM |
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So the SVA man cannot test it on the rollers then? The calibration is done on the car and it is obviously different acoording to the setup (no of
triggers, diameter of wheels etc) so I am going to use my gps system which seems to be more accurate than most car speedos (which have to read fast)
Does that mean I can scribble out a certificate then?
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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