LBMEFM
|
| posted on 15/1/09 at 09:39 PM |
|
|
Speedo
I made up my speedo sensor by fitting magnets to the prop shaft and using an ABS sensor from a Vauxhall. I tested it and the speedo needle moved but
it was obvious not at the correct speed. I bought a healer kit, which you make up yourself, and fitted it into the circuit. This time the speedo did
not work at all, I disconnected it and wired it direct as before and the speedo now does not work. My question is have I buggered up the speedo
(Fireblade clocks) with this device or is it just coincidence and the sensor assy has failed. I know it's difficult to say without seeing it but
how robust is the speedo and could I have broke it?
[Edited on 15/1/09 by LBMEFM]
|
|
|
|
|
mark chandler
|
| posted on 15/1/09 at 10:22 PM |
|
|
Do not know about breaking things but I have 9 magnets on my BEC, 185/60/13 tyres with 3.62 diff, almost exactly correct.
ABS sensors need to be really close to the magnets, have you disturbed this.
Also magnets need to all be in the same way around, use an extra magnet to make sure they all repel.
Regards Mark
[Edited on 15/1/09 by mark chandler]
|
|
|
LBMEFM
|
| posted on 15/1/09 at 10:27 PM |
|
|
Thanks Mark, I will give it a go at the weekend.
|
|
|
02GF74
|
| posted on 16/1/09 at 08:16 AM |
|
|
speedo would sense a change in voltage, e.g. between 0 V and 12 V but the high voltage can be less, e.g. 5 V.
Can you damage one with too high an input voltage? Answer is yes.
Without seeing the curcuit diagram, whcih may give clues as to the voltage required, then it is hard to say.
... but from what you describe -fitting ABS sensor whcih probably has no electronics to increase the voltage level with it working andthe fitting
healer - whihc I woudl guess would be capbable fo going as high as 12 V may have damaged the speedo.
To test the speedo you woulkd need to supply some pulses, starting with a low voltage then increasing to say 5 V and seeing if the needle react at all
|
|
|
mark chandler
|
| posted on 16/1/09 at 09:18 AM |
|
|
My fireblade clocks worked happily using an ABS sensor and moving steel without magnets, but the ABS sensor had to be very close, using magnets I
could increase the gap.
I used my lathe as a test bed originally as the magnets have to fly by the sensor to make it work so maybe test off the car with a drill and some
magnets taped to the chuck, then hold the sensor close.
For volts, it managed to make an analouge voltmeters needle jiggle on the 5v range.
Regards Mark
|
|
|
