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Posted: Mon May 19, 2008 1:15 pm
by Ralphh85
cool cheers for that, no masive hurry on my behalf but would save me a hole load of hassle!
Ralph
Posted: Mon May 19, 2008 4:54 pm
by stevieturbo
Ralphh85 wrote:thats like exactly what i wanted to hear, changing one restister on the pcb would be easy.
do you have any more info on which one?
my dials look very similar to thoes being rover.
my rev counter goes to 7 which is a bit over the top but doesnt mater i guess.
Ralph
If your rev counter has a pot on the board, you dont need to change anything !!!! Just adjust it.
If it doesnt, just slice the power feed going to the coil of the rev counter, and stick a 1k trim pot in that line.
Start the car, and adjust it until the rev counter reads properly. It is as easy as it sounds.
Posted: Mon May 19, 2008 5:12 pm
by bodger
the one i have now is a convoy binnicle and that has a pot under the black cover on the of the rev counter
Posted: Mon May 19, 2008 8:40 pm
by ChrisJC
Well, I found the piece of paper! :
I clearly compared two different rev counters (the 4 cylinder Maestro one and I think an 8 cylinder LDV one), and noted the differences.
The tacho designs are the 1st & 3rd in the photos I think.....
Anyway, it seems that I decided that changing C3 to 47nF was the answer. I tested it with a bench signal generator to make sure it was working OK, but I can't remember if I had to fiddle with VR1 (I suspect I did to get it spot on)
I rather think that just altering VR1 didn't give enough range to work properly with 8 cylinders.
Your mileage may vary....
Chris.
Posted: Mon May 19, 2008 9:38 pm
by Ralphh85
i will try an get another set of dials and open them up, sounds like you had the right plan of attack tho so think i will follow sout!
cheers for the info there top class!
Ralph
edit VR1 a variable resister??
Posted: Mon May 19, 2008 9:50 pm
by ChrisJC
Ralphh85 wrote:
edit VR1 a variable resister??
Yes.
Chris.