Dave Bailey
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| posted on 4/12/11 at 04:51 PM |
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Speedo
Hi... getting close to IVA now and was talking to someone a few days ago about my speedo pickup.... I have a sensor on the front wheel which is
obviously undriven.... I was told that during IVA the speedo is checked on a set of rollers... Is this going to be a problem? WillI fail being on an
undriven wheel?
Dave B
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rb968
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| posted on 4/12/11 at 05:22 PM |
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All I can tell you is at my IVA at Carlisle my speedo would not read correctly on the rollers. He tried it several times and eventually drove it round
the car park and assessed it. My sensor is on the near side driveshaft inner joint and as speed increased it went off.
I think there is some flexibility for he examiner to determine.
Rich
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stevegough
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| posted on 4/12/11 at 09:12 PM |
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the speedo is tested on rollers up to 70 mph - mine was tested on the rear wheels as the sensor is on the prop. If your sensor is on the front, he
will surely put the front wheels on? Not sure if the rollers can be powered if necessary, but I'm sure it isn't a fail having it on the
undriven axle.
Luego Locost C20XE.
Build start: October 6th 2008.
IVA passed Jan 28th 2011.
First drive Feb 10th 2011.
First show: Stoneleigh 1st/2nd May 2011.
'Used up' first engine may 3rd 2011!
Back on the road with 2nd engine may 24th
First PASA mad drive 26/7/11
Sold to Mike in Methyr Tydvil 19/03/14
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iank
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| posted on 4/12/11 at 10:11 PM |
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If it can't be measured on the rollers they are supposed to do a driven test at speeds between 35mph and 70mph.
quote:
17 Speedometer and Reverse Gear
Where the accuracy of the device is in question, (I.E any vehicle other
than an original unmodified speedometer fitted to an mass produced
vehicle which its self has no modifications that would affect the accuracy
of the device) and with the vehicle positioned on, or fitted with a speed
measurement device, operated to the manufacturer’s instructions, drive
the vehicle at a stable speedometer indicated speed of 35mph and note
the true speed. Repeat at four more speeds up to and including 70mph
as is necessary to confirm compliance.
Where the speed of the vehicle can not be measured with the available
equipment it may be necessary for the applicant to demonstrate
compliance.
--
Never argue with an idiot. They drag you down to their level, then beat you with experience.
Anonymous
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matt_gsxr
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| posted on 4/12/11 at 10:43 PM |
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My sensor was on a rear wheel for SVA. The rollers at Leighton Buzzard are not driven, and I have an open diff (no LSD).
So, the readings were off because one wheel was running much faster than the other.
They checked it by driving around the car park in a rather comedy fashion.
If I did it again, then I would set up my phone to video to record my GPS and speedo together on the way to the test (which is why I knew the
calibration was correct all along!).
Matt
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stevegough
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| posted on 5/12/11 at 05:49 PM |
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quote:
Originally posted by matt_gsxr
My sensor was on a rear wheel for SVA. The rollers at Leighton Buzzard are not driven, and I have an open diff (no LSD).
So, the readings were off because one wheel was running much faster than the other.
They checked it by driving around the car park in a rather comedy fashion.
If I did it again, then I would set up my phone to video to record my GPS and speedo together on the way to the test (which is why I knew the
calibration was correct all along!).
Matt
Good point, Matt - When I was watching my tester doing mine, I noticed that the left rear wheel was only turning slowly during the test, so I asked
the tester if a brake binding on one wheel would upset the reading? -His answer was that it wouldn't as the equipment takes an average
of the speed of the two wheels.
Luego Locost C20XE.
Build start: October 6th 2008.
IVA passed Jan 28th 2011.
First drive Feb 10th 2011.
First show: Stoneleigh 1st/2nd May 2011.
'Used up' first engine may 3rd 2011!
Back on the road with 2nd engine may 24th
First PASA mad drive 26/7/11
Sold to Mike in Methyr Tydvil 19/03/14
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Dave Bailey
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| posted on 5/12/11 at 08:48 PM |
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Thanks all for the info.....
I will check the pickup and hopefully it will get tested by driving around the car park....
thanks
Dave Bailey
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