i want to mount my speedo sensor on the o/s front upright, will this be an issue with the sva? ie: does it have to be mounted on a driven wheel or
prop? im using a koso rx1n clock. anyone else using this type? any help would be appreciated.
thanks
rob
I could be wrong on this, but I think I recall someone having a problem with a speed sensor when it was reading differently on one side than the
other, but I don't know exactly what the problem was since there are more than a few people out there who have mounted the speed sensor on a
drive shaft!
I'm sure someone on here can correct/amend my story to be a little more accurate!
Steve
it has to be mounted on a driven wheel as they drive your chariot on rollers to check speedo
yeah i would agree with conrodkid as its driven up on the rollers, not by the rollers.
At my first SVA they said cos they couldn't assess the speedo on the rollers they'd do so in the car park by driving the vehicle!!! The
examiner only complained (and failed it) when he couldn't see the bike speedo because I'd put in line-of-sight through the steering wheel
for me (with a tall back) and he was a short arse....
Rules might have changed since then (or he might have been liberally interpreting them)...
I had a similar problem with SVA a few years ago (Fisher Fury). I'd fitted the sensor to the front upright (very nicely done) and they insisted
it should be on a driven wheel as they couldn't test it. Of course, a driven wheel may be less accurate if you're getting wheelspin!!
I had to move it to the prop for the retest - bast*rds!
Wyn
Phone your intended sva centre and ask them - perhaps you could take along a GPS.
quote:
wheel may be less accurate if you're getting wheelspin!!
i will try and give them a ring. i want to mount it on the upright as i have found a tidy place for it, but will have to find another place it. thansk
guys
Rob
as already said^^^
but depends on the type of rollers at the center.
you would need rollers for front and rear for your speedo to be ableto read; I donlt think they have anything like that in most centres.
so in short, no.
even if you mount on rear, that may not work, as in my case, since you need both wheels to be running at same speed - I had diff action so one wheel
was stationary,m other runing at 2x 
I had to go to rolling road with one rear roller (SVA centre has 2 so can measure brake effficiency on each wheel separately) and get a print out,
cost £££ 
fitting to prop, hmmm, that is spinnig about 3x what your wheels are - not sure the speedo can be adjusted for that. (you'll be looking at a 9
inch wheel )
why would you take along a GPS, if it's done on the rollers (and therefore at a standstill in terms of actual motion) then it won't be that
accurate really will it?
quote:
Originally posted by chriscook
Phone your intended sva centre and ask them - perhaps you could take along a GPS.
But if it can't be done on the rollers because they can't drive the front wheels then you can drive along and calibrate against the GPS!
quote:
Originally posted by worX
why would you take along a GPS, if it's done on the rollers (and therefore at a standstill in terms of actual motion) then it won't be that accurate really will it?
quote:
Originally posted by chriscook
Phone your intended sva centre and ask them -
perhaps you could take along a GPS.
And how is that different from the rear wheels? If it was different then the differential wouldn't have been invented.
To do it properly you need to measure both undriven wheels and take the average. (assuming 4 wheels, one in each corner)
quote:
Originally posted by Danozeman
Also wont be acccurate on the front when the wheel is on the inside of a turn.
quote:
Originally posted by 02GF74
fitting to prop, hmmm, that is spinnig about 3x what your wheels are - not sure the speedo can be adjusted for that. (you'll be looking at a 9 inch wheel
This has worried me,
ive just bound and fixed my loom in place with the sender wires finishing at the front hub as sugested by the revotec man at stoneleigh where i
bought my instruments.
I rang the sva helpline who said that as the test centers only had a single set of rollers they could not test if on the front wheels however if i had
the speed independently tested they would except it.
BUGGER!
kenton
re: the gps idea - they have to verify up to 70mph - they won't be able to do that at the test centre....
Bob
where would you be able to get it calibrated for it to pass? hass anybody fitted a koso semsor to the prop if so let me know how you done it and how
you mounted the magnets.
cheers
rob
quote:
Originally posted by COREdevelopments
where would you be able to get it calibrated for it to pass? hass anybody fitted a koso semsor to the prop if so let me know how you done it and how you mounted the magnets.
cheers
rob
im using a live axle so its going to have to be mounted on the prop.
It doesn't have to be on a driven wheel, mine was mounted on the front wheel. So when they tried to test it on the rollers they couldn't,
the testers comments were we've seen it working in the carp park so that's fine. I have since replaced the unit that comes with the Acewell
with this one http://www.gprdirect.com/epages/GPRDirect.storefront/467aa2d7005735df2719d9c7b80506ad/Product/View/TERT006
If the link doesn't work using search manufacturer Terratrip & part No TERT006.
Alan...