gregs
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 posted on 1/1/10 at 10:35 AM |
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Speedo sensor positioning
Happy new year all,
I know this is covered in many previous posts, but I haven't been able to get to a clear answer..
After moving my V6 g'box back to get it to fit and getting a clash of the cable to the chassis, I have got hold of a telemetrix electric speedo
(smiths) and have an induction sensor - but i'm not sure where to mount the sensor.
I have push in drive shafts so can't add a toothed wheel at the output of the diff. I think this leaves me with doing something on the prop or
the diff input flange....?
Can I get away with using the diff bolts as pickup or is there another 'technique' i am missing?
My understanding is that induction sensors are effected by the presence / moving of ferrrous - does adding magnets make any difference?
Cheers,
Greg
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rusty nuts
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| posted on 1/1/10 at 11:22 AM |
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Have you thought about using the prop shaft bolts instaed of magnets? Works fine on my car
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gregs
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| posted on 1/1/10 at 11:59 AM |
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thanks - I have done - where have you positioned your sensor? - coming in from the side or lengthways?
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rusty nuts
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| posted on 1/1/10 at 12:40 PM |
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Fitted mine lengthways using a small bracket bolted to the diff . Make sure you tighten the bolts so that the hexagon is in the same relative position
to the sensor as the prop rotates to get a smoother signal . Thought I would try it after reading about all the problems with magnets flying off .
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02GF74
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| posted on 1/1/10 at 12:45 PM |
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have looked at posssibility of using gearbox sender takeoff?
Burton Power send adapter for Ford gearbox.
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gregs
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| posted on 1/1/10 at 03:00 PM |
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quote:
Originally posted by 02GF74
have looked at posssibility of using gearbox sender takeoff?
Burton Power send adapter for Ford gearbox.
yes - unforutnately my chassis clashes with the g'box at the takeoff point so would be no-go. - thanks for the suggestion mind!
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hicost blade
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| posted on 1/1/10 at 04:32 PM |
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You can mount the sensor on the front upright picking up from the wheel studs.
[Edited on 1/1/10 by hicost blade]
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matt_gsxr
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| posted on 1/1/10 at 05:32 PM |
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I have push in sierra driveshafts and a bicycle speedo.
I simply mounted a magnet onto one of the "metal beans cans" using a pair of jubilee clips. The magnet was out of an old hard-drive.
I would have used the propshaft bolts, but my bike speedo had a minimum "distance traveled per pulse" which was too high to do this.
At SVA it was difficult to calibrate the speedo, because their rollers allowed the rear wheels to rotate at different speeds, and reports the average
of the two (my diff isn't lsd).
Matt
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gregs
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| posted on 1/1/10 at 05:46 PM |
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quote:
Originally posted by hicost blade
You can mount the sensor on the front upright picking up from the wheel studs.
[Edited on 1/1/10 by hicost blade]
now that's the sort of thing I hadn't thought of! - nice one 
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gregs
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| posted on 1/1/10 at 05:51 PM |
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quote:
Originally posted by matt_gsxr
I have push in sierra driveshafts and a bicycle speedo.
I simply mounted a magnet onto one of the "metal beans cans" using a pair of jubilee clips. The magnet was out of an old hard-drive.
I would have used the propshaft bolts, but my bike speedo had a minimum "distance traveled per pulse" which was too high to do this.
At SVA it was difficult to calibrate the speedo, because their rollers allowed the rear wheels to rotate at different speeds, and reports the average
of the two (my diff isn't lsd).
Matt
Well, i'm not using magnets, but your post has given me an idea..... if I use jubilee clips that are ~1/4 circumference of the bean can, then I
can use the screw mechanisms as the pickup.... will give it a go tomorrow.
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02GF74
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| posted on 4/1/10 at 01:25 PM |
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quote:
Originally posted by gregs
quote:
Originally posted by 02GF74
have looked at posssibility of using gearbox sender takeoff?
Burton Power send adapter for Ford gearbox.
yes - unforutnately my chassis clashes with the g'box at the takeoff point so would be no-go. - thanks for the suggestion mind!
I have the problem on mine - so I made my own pick up - a bearing, brass rod and some aluminium, magnet and sensor - easy as peasy and much cheapness
too.
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