8 replies to this topic

[keecai]

hi,
i have recently fitted a digital dash to my mini, it is the one from the old astra GTEs. i have managed to wire everything up so it all works, however the speedo shows a very inaccurate reading, can anyone suggest how i can get this calibrated correctly or atlest more accurately. (the speedo is run by a transducer)
thanks

[Guess-Works.com]

I don't know where the transducer is fitted but I assume to a drive shaft or wheel hub.... this measures the turns per mile of the wheel which is obviously different in size to the Astra ( and you speedo is reading really fast )

I suspect there may be a calibration pot or switch in the back of the speedo somewhere, had you tried some 'astra type' forums ?

[keecai]

the transducer goes exactly where the normal mechanical speedo drive went (in the gearbox) i have made a modified thread to attach it correctly, there are no switches i know of on the back of the dash. the transducer runs via 3 wires, which i assume are a live, an earth, and a signal feed. the speed shown on the dash is much slower than i am actually travelling at. would placing resistors anywhere on this set up alter the signal received by the dash?

[redhotmini]

iirc the tranducer works with electrical pulses so i dont think resistors will help. if you search for a company called speedy cables (i think thats their name) they may be able to calibrate it for you.

[dklawson]

As stated above, the transducer will be putting out pulses so adding resistors won't do anything. What you need to do is multiply or divide the pulse train from the transducer to the gauge.

There are aftermarket devices to do this but I haven't researched them much. Over here they are aimed primarily at people who change the differential in their fast street cars. I have also seen the products advertised for owners of late model motorcycles. They aren't cheap.

Found one:
http://www.egauges.c...r=Ratio_Adapter
and another:
http://www.abbott-tach.com/era.htm
and two more:
http://www.supernatu...pters-c-58.html
eBay, item #140077020653

[keecai]

ok cheers for that,
do you know what is needed for them to work? if i got one would it definately work on this set up,
thanks

[Retro_10s]

as said, go to speedy cables, they do this stuff all teim and ahave fantastic reputation.

[dklawson]

You're transplanting instruments between makes and models. There can never be guarantees of such a thing working. As suggested above, you'll want to contact Speedy Cables and see what they say. All the links I found were for products in the U.S. Even though the current exchange rate is in your favor, I'd purchase an item like this close to home to get technical support when you need it.

[andyirl]

you need a speedo corrector , here is a post from someone doing something similar, the corrector goes inline and you adjust manually, $50 australian dollars not too dear

http://www.autospeed...15/article.html

would be interested in how you get on as thinking of putting one in my rover