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Libra V6 speedo 
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Joined: Mon Apr 17, 2017 10:05 pm
Posts: 34
Location: Bristol
GTM: Libra
Post Libra V6 speedo
The speedo is failing on the Libra and my efforts to fix it have been unsuccessful, so I'm replacing it with a new rone from ETB .

I have to set the new unit up for the appropriate speed sensor signal - does anyone know what signal the original Caerbont speedo uses?
Choices are:-
a) M8 NPN sensor
b) 2-wire Magnetic Induction sensor
c) 3-wire Hall-effect / OEM gearbox sensor

My guess would be the Hall-effect OEM sensor - can anyone confirm that?

Thanks.


Fri May 21, 2021 11:19 pm
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GTM Nirvana
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Joined: Sun Oct 19, 2014 10:10 pm
Posts: 1015
Location: Bristol
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Post Re: Libra V6 speedo
Not sure what gearbox the V6 uses. If its a PG1 it uses an electronic adaptor that takes the rotational drive and turns it into pulses. These came as standard on MGTF. Mine came originally with one of those adaptors on it feeding the wires to the GTM speedo - easy to spot on the top of the gearbox at the back, three wires. If you have one of those than OEM seems a good choice.


Sat May 22, 2021 8:50 am
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GTM Nirvana
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Joined: Sun Oct 19, 2014 10:10 pm
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Location: Bristol
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Post Re: Libra V6 speedo
https://www.the-t-bar.com/forum/9-mgf-tf-pitstop/96551-instruments-calibration-data

This might be useful if you do have the MGTF speedo transducer. Apparently it gives 4000 pulses per mile.

http://etbinstruments.com/ETB_Gauge_Wiring_PDF/ELEC%20SPEEDO%20CAL%20INSTRUCTIONS.pdf

ETB ship them set at 41000 pulses per mile so more than 10x out!


Sat May 22, 2021 1:08 pm
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Joined: Mon Apr 17, 2017 10:05 pm
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Location: Bristol
GTM: Libra
Post Re: Libra V6 speedo
Crikey, somebody knows a lot about electronics!......very useful stuff....Thanks

My V6 has a PG1 gearbox and I had a poke around earlier........this looks like the speed sensor, so OEM it is.

Thanks again for your help.


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Speed sensor.jpg
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Sat May 22, 2021 6:10 pm
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Joined: Sat Feb 14, 2009 6:06 pm
Posts: 385
Post Re: Libra V6 speedo
Hi

Why not just send it to Caerbont for repair?


Sun May 23, 2021 10:17 am
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Joined: Mon Apr 17, 2017 10:05 pm
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Post Re: Libra V6 speedo
Tried that, they don't do repair/refurb unfortunately.


Mon May 24, 2021 11:18 am
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Looking like a GTM

Joined: Sat Mar 12, 2016 7:05 pm
Posts: 191
Post Re: Libra V6 speedo
What's wrong with the speedo the lcd display or something else


Mon May 24, 2021 4:32 pm
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Post Re: Libra V6 speedo
oldshep wrote:
Tried that, they don't do repair/refurb unfortunately.


Have you tried Speedy Cables? They are in the same building. I always assumed they were the same compnay

https://speedycables.com/


Mon May 24, 2021 4:59 pm
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Joined: Mon Apr 17, 2017 10:05 pm
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Location: Bristol
GTM: Libra
Post Re: Libra V6 speedo
LCD display is OK but sometimes displays what I think must be a revs per mile number rather than the mileage reading.
Speedo needle often fails to move, other times OK.
Had it apart and resoldered a couple of dodgy looking joints but still unreliable/inconsistent. Fed up with taking it out, trying something else, reinstalling it, so I've stopped faffing around and bought the ETB equivalent which also has a few other functions as well as being cheaper.


Mon May 24, 2021 6:02 pm
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