| [ Total Views: 522 | Total Replies: 6 | Thread Id: 47319 ] |
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 Volkswagenboy
A.k.a.: Brenton Barry
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Staggers Automotive.
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| posted on December 27th, 2005 at 03:28 PM |
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Speedometers
Has anyone any information on converting an analogue speedometer to a digital type?
Thanks.
STAGGERS AUTOMOTIVE - Heavy Vehicle Diesel Specialist
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modulus
A.k.a.: Peter Hill
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| posted on December 27th, 2005 at 05:08 PM |
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Most air-cooled speedos are analogue, driven by a cable from the front-left wheel bearing; the speedo instrument itself makes sense of the rpm of the
cable and indicates a speed.
An analogue speedo needs a digital signal fired every time something speed-related happens (e.g. every time a magnet on the output side of the
differnetial passes a coil).
Depending where you're going with this you can either continue with the cable-driven speedo and get an instrument tech. to convert it to digital
activation (but what is achieved?) or you can create a Vehicle Speed Sensor (VSS) using magnetic pickups on e.g. the flanges of CV joints which would
then be suitable as input for a number of other instruments.
I'm building an electronic speed alarm for my Transporter at the moment, and I'll use 8 magents spaced around a CV flange to cause a pulse through a
stationary coil as the speed input; this will give me a digital speedo as well as the speed alarm; I'm leaving the analogue speedo intact.
Other folk on this forum are trying to solve the problem of how to feed their VSSs for fuel injection systems. The Search button is your friend.
hth
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Volkswagenboy
A.k.a.: Brenton Barry
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Staggers Automotive.
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| posted on December 27th, 2005 at 08:26 PM |
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True, true.
STAGGERS AUTOMOTIVE - Heavy Vehicle Diesel Specialist
JB CUSTOMS & CLASSICS - Car Builders
2/53 Tradelink Drive, Browns Plains |
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helterskelter400
Fahrvergnugen
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| posted on December 27th, 2005 at 08:56 PM |
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$19.99 base model push bike speedo will do. you can of course spend much much more..., lengthen wires and inspect front brake/hub area with some
liquid nails with the enclosed sensor and magnet.
an alternative, hardwire a gps in and mount it on dash......
edit
found it... here's a pic when i had the bike speedo on....
[ Edited on 27-12-2005 by helterskelter400 ]
:thumb
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11CAB
Compulsive Aussie Vee Dubber
If ya got it....Baja it
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| posted on December 27th, 2005 at 09:26 PM |
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I see your a Cat lover Helterskelter.......:P
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helterskelter400
Fahrvergnugen
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| posted on December 27th, 2005 at 09:45 PM |
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no, you got it all wong... i love cats... but only after they've been processed by the local chinese takeaway. haha
:thumb
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blutopless2
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| posted on December 28th, 2005 at 06:43 AM |
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i will eventually be doing this for my speedo when i change over to the VDO vintage series. The new speedo requires a digital signal. There is a
converter which is used with this speedo that converts from the cable rpm to a digital signal which is wired to the speedo. I am intending to use a
speedo place to set this up for me.
see.... air and water do mix 
1974 1300
1997 MK3 Golf GL
2003 NB Cabrio
2012 Golf VI GTI
2014 Audi A4 Quattro |
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