Car nearing completion, I have a small problem of the tacho redaing twice the true reading. This is also with true with the Speedwell. I guess its because its getting the pulse from the coil pack which has a waste spark. Where should I get the pulse from??? ZZR1200 BTW
Many thanks

what ignition system is it?

The Kawasaki system from the bike. Its on zzr1100 carbs BTW

I guess you have a wasted spark ignition, hence the double reading.

Can you change the setting to make it 2-stroke. That fires each cycle and then it will be fine again.

I don't know of an easy way to halve the pulses (I guess you could build some kind of flip-flop circuit which would halve the pulse rate). The Dyna 2000 ignition units have 2 different outputs for tachos (one every cycle and one with 2 per cycle). Does your CDI not have an appropriate output, sometimes they do.

Matt

Yes you could just put a flip-flop circuit in it series. Would cost all of a pound and take about 30 min to make slowly.

The tacho output from the ECU will usually give one pulse per engine revolution (it does on all the bike engines I've played with). Looks like it's a light blue wire coming from pin 23 on the ECU according to the ZX12R wiring diagram I've found here.

Brommers,

Not sure this is the case with Suzuki engines.

Just noticed that you have updated your pages. Nice one. I got a bit bored of looking at those data-log outputs from September.



Matt