I've got my Acewell dash now and looking at fitting the speed sensor. Will be using the sensor and magnet that came with the dash for now but
having had a look at it I'm not quite sure how the sensor should be orientated in relation to the magnet and also quite how/where to fit it.
Should the magnet be fitted like option A
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Or Option B
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How have others fitted theirs and to what location. Running a Type 9 with prop to the Diff. Don't think there is enough cable to allow me to run
to the rear of the car to fit magnet to a wheel or drive shaft. (There is an extension piece but not that long)
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I don't have a picture of mine but its option B. At least, it is with my ETB gauge.
I originally fitted mine to the prop shaft side of the diff but it was a pain to get to to adjust and it picked up interference from the diff to prop
shaft flange bolts. I then moved it to the drive shaft end of the diff. Much easer to get to, which makes adjusting it to the right gap a lot
easier, and its also much more stable a signal as a) its spinning slower due to the gear ratio of the diff and b) the allen key bolt heads don't
seem to interfere in the way the hex head bolts did.
To fix the magnet I filed the edge of the diff flange a little to give a good clean and rough surface and then glued it on with araldite. Tested it
on the rollers at IVA to 90MPH and the speedo needle didn't bounce at all and I've been faster since (on a track)
The signal is only transmitted by two wires so you should be able to make the cable any length you want by splicing a new bit in (I think).
[Edited on 29/2/16 by SteveWallace]
quote:
Originally posted by SteveWallace
I don't have a picture of mine but its option B. At least, it is with my ETB gauge.
I originally fitted mine to the prop shaft side of the diff but it was a pain to get to to adjust and it picked up interference from the diff to prop shaft flange bolts. I then moved it to the drive shaft end of the diff. Much easer to get to, which makes adjusting it to the right gap a lot easier, and its also much more stable a signal as a) its spinning slower due to the gear ratio of the diff and b) the allen key bolt heads don't seem to interfere in the way the hex head bolts did.
To fix the magnet I filed the edge of the diff flange a little to give a good clean and rough surface and then glued it on with araldite. Tested it on the rollers at IVA to 90MPH and the speedo needle didn't bounce at all and I've been faster since (on a track)
The signal is only transmitted by two wires so you should be able to make the cable any length you want by splicing a new bit in (I think).
[Edited on 29/2/16 by SteveWallace]
As long as the magnet passes the end of the sensor it shouldn't really matter, but of the 2 options B would be better, the fact that A has both N & S poles of the magnet passing the sensor end just could cause problems
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Originally posted by russbost
As long as the magnet passes the end of the sensor it shouldn't really matter, but of the 2 options B would be better, the fact that A has both N & S poles of the magnet passing the sensor end just could cause problems
Hi
Extending the cable is no problem, just ensure you don't run it close to alternator or HT leads as that can cause interference problems, if for
any reason you need to run close to items like that then just use a thin coax cable or similar screened cable
Cheers Russ
Thankfully my Koso doesn't use a magnet,so mine picks up off the rear drive shaft bolts on my sierra drive shafts.
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quote:
Originally posted by CosKev3
Thankfully my Koso doesn't use a magnet,so mine picks up off the rear drive shaft bolts on my sierra drive shafts.
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quote:
Originally posted by russbost
quote:
Originally posted by CosKev3
Thankfully my Koso doesn't use a magnet,so mine picks up off the rear drive shaft bolts on my sierra drive shafts.
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You can get a similar Hall (proximity) sensor for the Acewell that replaces the standard reed switch, Acewell are generally a little cheaper than Koso for similar features so not a daft idea if it's something that bothers you. Most of the modern Acewells can use the standard OE gearbox sensor on the vast majority of vehicles
That may be the case for a Koso, & possibly in laboratory conditions for any other dash, but in the real world we only normally ever use one
magnet with the Acewells (if you put that on the propshaft you are effectively using 3.62, or whatever your diff ratio is). A car I recently helped
the owner thro' IVA with had set the dash up on exactly the tyre circumference he had - we recommend setting around 2-3% higher to give a margin
of error for the dash to over read as the one thing it cannot do to pass IVA is under read. When the guy put it thro' the speedo checks at 30, 40
etc up to 70 mph, every single one was bang on the figure or no more than 0.1mph off! The tester was a bit gobsmacked & said he was going to keep
a copy of the printout to show others as he'd never seen a speedo so consistently accurate throughout the range, hence I feel I can state with a
fair degree of certainty that you don't need more than one trigger point per wheel revolution on the Acewell to be accurate! 