Geordie Jim wrote: ↑
Tue May 25, 2021 8:57 pm
GDCobra, on the rover 14cux system there is a resistor ( 6K7 I think ) for the signal wire,white/black into the 14cux. I am going to connect the Nodiz brown wire to this, can't try it yet, waiting for hoses and plug leads. tried it on a scope,looks OK.
The rev counter is a different matter. On the P6 the rev counter was run from the feed to the coil, on a points system. Whet I fitter the EFI and an SD! dizzy, I changed the internals of the rev counter. Got to figure out what to do with the rev counter now.
Hi Jim, good to here you're moving on with this.
Sounds like the wire colours are not conssitent or have changed since I got my unit late last year.
When you say "the NODIZ brown wire" I'm assuming that is the one connected to pin 2 "Tachometer Output (for 12v tachometers)"?
On mine this is a blue wire.
When you say you "tried it on a scope,looks OK" I assume you mean you had the engine turning (still driven by the distributor) and you monitored the output?
If so I'm assuming this was a 12v 50% duty cycle form but what was the frequency and what engine RPM?
For instance if your engine was on idle of aound 800 RPM i'd expect the frequency to be around 53Hz if I did the math's correctly (800 RPM = 13.33 RPS x 4pulse/rev' = 53.33 or 19mS/cycle) can you confirm if that's what you saw?
When you changed your tachometer to run with the EFi and SD1 dizzy what did you use the tachometer input?
One other thing to watch out for is the the coil firing order. I originally took my firing order from one of teh ME videos from You Tube, this indicated the coil firing order as ACBD but I found that it is actually ADBC (C & D transposed) on my unit at least, so I'd advise creating your loom temporarily first and proving this out before making up all your connectors permanently (unless easy to re-wire).
Another thing I struggled with is the Base Offset for the crank trigger, you have to start from 180° and then subtract the degrees before TDC that your missing tooth is set at. The manual was not clear on this to me.
To clarify, on my engine the missing tooth was passing the sensor at 60° before TDC, by trial and error I ended up with a figure of 119°, worked out that this was 180-60 (nominally), I confirmed this with ME.