Speedo pulse wire for sat nav

[rbfisher]

Hi,

Does anyone know where and what colour the wire sending speedo pulse information for connection to a satellite navigation system is? The car is a 99 T chim 4.0l.

Cheers,

Richard Fisher

[david beer]

I tried the speedo pulse on my 99 griff 500 but unfortunately it does not give a pulse below 5mph. You would think this is ok but in town you can crawl along and the navi only updates the position by sats, so your "turn left in 100 yards"is missed. Of course not all TVRs are the same so try yours. Drive slowly and see if your speedo registers. If you could keep it up all year would make for very low milage.

[rbfisher]

Mine's the same but you can move the speedo transducer nearer the rear driveshaft cog. Anyway, which wire do you use for the sat nav pulse?

Cheers,

Richard Fisher

[q405mb]

Will moving the sensor closer to the cog increase the speedo pulse rate or simply give you a stronger signal?

David?

Harrigan

[david beer]

If you find your converter box the blue wire. As for moving the sensor, do not know. I use a clever thing that detects the magnetic belt in the tyre. I also have to say that my Rangie doesnt register below 3mph and a company that does modules for various car have in the small print"will not work at low speeds".

[Leadfoot]

Wouldn't mess with the sensor gap. Mine was slightly out after diff mounting bush change - the speedo was ok up to 80, thereafter it shot up & bounced around anywhere between 140/180!

[shpub]

quote:
Will moving the sensor closer to the cog increase the speedo pulse rate or simply give you a stronger signal?

Neither. The sensore relies on the speed of the tooth to generate the pulse and needs about 5 mph to enable it to detect it.

RaceLogic in Buckingham sell a sensor that uses a different principle and will trigger at any speed even if stationary. The 520 is stuffed full of them for the traction control and digital speedo. Costs about £50 but has a set up led so you can adjust the gap very easily. I would fit that and keep the systems seperate. There is always a potential problem when sharing signals that something might not agree and refuse to work.

steve
www.tvrbooks.co.uk