Rev counter for a v8 e30

[tomislav]

Anyone know what the best way is to get the rev counter on a v8 converted e30 working properly? At the moment its apparantly reving to about 9500rpm

Chip out of an e34 dash panel maybe?

[Speedtouch]

Wouldn't a 4-pot coding plug work? Maybe with a simple divider circuit (to divide by 2) in the connection between the engine and the clocks.

[HairyScreech]

whats the feed for the e30 clocks? does it just come off the negative side of the coil or out of the ecu?
(can't remember without looking it up)

[Speedtouch]

I think on most E30s, it normally comes direct from the ECU, however, he has a V8 fitted, so it will depend on which engine management system he has in place.

[HairyScreech]

True, just wondering if you could use the diode trick and pick up of the negative side of 4 of the coils and feed that back to the ecu. Quick and dirty but it works and it works well.

[tomislav]

I bought the car with the engine already fitted but it looks to be a bit of a lash job, as far as i know its ecu fed

[Speedtouch]

And which engine and management ECU are fitted?

[penton08]

Wouldn't a 4-pot coding plug work? Maybe with a simple divider circuit (to divide by 2) in the connection between the engine and the clocks.

This works!!

[tomislav]

M60B40, god knows on the ecu, but i can find out

[Speedtouch]

And what was the car originally, or what coding plug does it have in the instruments cluster - four or six-pot?

[tomislav]

6 pot. Looks like i need a 4 pot chip with a signal halver thing then.

[jmc330i]

Dakota Digital is a name that I remember from a few years back. It's an American thing, but there was a couple UK stockists at the time.

It was used to convert the signal from an 8 cyl to run a 4 cyl rev counter.

[Speedtouch]

See this thread on the subject:

http://www.r3vlimited.com/board/showthread.php?t=232032

[tomislav]

Dont have the panel from the doner car mate, i didnt do the conversion, its long gone