Chas
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| posted on 28/10/08 at 09:30 PM |
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SVA proof speedo
Hi guys, I need a cheap speedo to get me through the SVA test. I've heard you can use a bicycle speedo for under a tenner and wondered if I
could get any suggestions. Also, is it possible to use a wireless one to save running wires round?
Cheers
Chas
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austin man
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| posted on 28/10/08 at 09:47 PM |
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I do know that the halfords ones have been used successfully and are under 20 quid. Take the instructions with you to the SVA just in case u need to
fine tune
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tomgregory2000
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| posted on 28/10/08 at 09:49 PM |
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i thought the display needs to be illumated to pass
tommy
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robinj66
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| posted on 28/10/08 at 10:10 PM |
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quote:
Originally posted by tomgregory2000
i thought the display needs to be illumated to pass
tommy
Yep - and the power/ illumination needs to be wired up to the car battery and not rely on the internal power source. I had this checked today
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clairetoo
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| posted on 28/10/08 at 10:17 PM |
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I dont think a wireless one will work on a car as there will too much stuff between the sender and the unit - on a bike there is just air
Its cuz I is blond , innit
Claire xx
Will weld for food......
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dhutch
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| posted on 28/10/08 at 10:25 PM |
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I would have thought wired where better.
- Ive had wired ones working on abuot 20ft of cable (extended by soldering in additional lenght) on a boat. But the wireless ones tend to be fairly
line-of-sight.
You can get backlit ones, if thats a requiment?
Daniel
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nitram38
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| posted on 29/10/08 at 05:44 AM |
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You also need a non-resetable odometer that is not able to be "clocked".
I think a bike one can be reset.
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maartenromijn
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| posted on 29/10/08 at 07:32 AM |
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Hi, I am also interested in a locost speedo.
Any examples of SVA-OK bicycle speedo's?
I mean, given the above requirements it must be hard to find a bicycle speedo to match.
BLOG: http://thunderroad-super7.blogspot.com/
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JAG
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| posted on 29/10/08 at 10:01 AM |
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My car passed SVA at Nottingham in 2005 with a wired push bike speedometer.
I used a Sigma BC1200 - mainly because it reads upto and beyond my cars theoretical top speed. I had to add a small light, wired to the cars battery,
that lit when I switched on the side/head lights.
Other than that and a little resetting during the test it passed fine. Do remember to take the instructions with you - my tester photocopied the bit
about max' speed reading. The BC1200 can read upto 183mph (300kmh) although my car runs out of puff around 120'ish.
Justin
Who is this super hero? Sarge? ...No.
Rosemary, the telephone operator? ...No.
Penry, the mild-mannered janitor? ...Could be!
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maartenromijn
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| posted on 29/10/08 at 11:19 AM |
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quote:
I used a Sigma BC1200 - mainly because it reads upto and beyond my cars theoretical top speed. I had to add a small light, wired to the cars battery,
that lit when I switched on the side/head lights.
Did you build in a small light, into the speedo housing? Or did you make a small external lamp on the dashboard?
What about the non-resetable odometer and the powersupply for the speedo itself (not speedo-light)?
BLOG: http://thunderroad-super7.blogspot.com/
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02GF74
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| posted on 29/10/08 at 12:08 PM |
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I used a cheap halfods speedo, picked up for a couple of quid at jumble sale 
There is 2 white LEDs to illuminate the display, wired to car side lamps, and a little hood to prevent glare, covered with the finest quality black
insulation tape.
The magnet is fitted to a aluminium disc pressed into one of the holes in the halfshaft, core plug style. The sensor is on a bracket insdie the brake
drum.
 
Rescued attachment speedo.JPG
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JAG
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| posted on 29/10/08 at 12:33 PM |
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I built my own light that hangs over the speedo.
There was no problem with the resettable odometer or the power supply to the speedo itself.
Justin
Who is this super hero? Sarge? ...No.
Rosemary, the telephone operator? ...No.
Penry, the mild-mannered janitor? ...Could be!
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02GF74
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| posted on 29/10/08 at 01:55 PM |
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,,, forgot to say bout wireless speedometers. In my expereince (of 1 speedo!) and what I read about them is that the transmitter must be very close
to the the head unit, less than 1 m, if you want to work reliably.
I canmnot see how you can mount the tw=wo to be less than 1 m apart; plus there may be interference from igntion.
definitely go for a wired unit, more locost.
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