Crazy rev counter

[Vegard]

I've fitted an Elliot rev counter on my racecar. However, lately at top rpm, the needle has started to bounce. It exceeds 8000 at times, and I know that the engine doesn't. On my last race this weekend, the engine started to midfire at top in fourth as well. I guess this could be related.I'm running Lumenition breaker-less ignition.

Any ideas on what's causing this?

[JC T ONE]

I'm running Lumenition breaker-less ignition.

I belive this is the setup with an "eye" inside the distributor ?

If it is, then check the little copperwire, on the bottom plate (from outer housing, to ground plate) this can sometime brake off.

[big-un1967]

I may have the answer?

My FIA race car had the same problem, and my friends Elva fitted with a BMC FJ set-up.

It seems that if you run a Elliot taco and LUCAS SPORTS (gold) coil, they are not compatible.

You need to fit a diode on the coil, to smooth the signal out. This is the recommendation from Elliot, and it has worked for us both.

I don't have the car in front of me, but when I next look i will feedback what rating it is?

Regards

Paul.........

[Tim Harber]

Elliott stopped making rev counters a year and a half ago , so don't expect any help from that end.

I've got one on my 7 port thing and its's fine with a cheap coil. Never felt the need for a sports coil especially as they're a bit blingy for me

[Vegard]

As a matter of fact, this started when I changed to a gold coil. Seriously
Could the misfire come from this as well?

[JC T ONE]

As a matter of fact, this started when I changed to a gold coil. Seriously
Could the misfire come from this as well?

Only one way to find out

[Jack of all trades]

When we were racing in the '90s we had loads of problems with the Lucas sports (gold) coil, we swapped to the old SA12 with the brown top http://www.google.com/imgres?q=lucas+sp ... 9,r:4,s:68 and all the problems were solved. It never failed in 3 seizons.

[sandman]

Lucas coils are known to cause problems... I would swap back and try.
I always carry a spare - which come to think of it - you now got Vegard (hehehe)

[Vegard]

Lucas coils are known to cause problems... I would swap back and try.
I always carry a spare - which come to think of it - you now got Vegard (hehehe)

Indeed, and see where it got me...A lost race