Rev counter/tacho wire.. tried everything

[c20xeMira]

Hi,

I have done a c20xe conversion into a Holden Camira - everything is done except for the tacho. I am using a cheap ebay 5" tacho at the moment, and the engine is a Calibra - distributor version.

I have tried:

Green wire from green plug (number 4 on the XE wiring info thread picture)
Every plain green wire coming out of the ECU
The wire connected into Pin 43 on the ECU (which was green/brown)
Wire direct to negative terminal on Coil (This works, but is showing way too many revs, and it is all over the place)

In the end, I went nuts and connected the tacho signal to every wire on the 3 connectors near the ECU. A brown/black wire on the black connector (Number 4 on the wiring picture) DID register on the tacho, and went up when I revved it, but it was registering way too low (as in, ~4k rpm was showing 1200rpm). This wire had ~8v on it.

Any ideas? Any way to get either the negative coil wire, or the brown/black to work properly? Thanks :)

[Asa-James]

does the gauge actually work? and surely it would have come with destructions. also, does the gauge have a swtich on the back for 4/6/8 clyinders? and have you changed it?

apologies for not being any more help, but it is 8.40 in the morning!

[c20xeMira]

Yes, the gauge works. When connected to the coil, it goes up with the revs, but WAY too high and 'noisy' when it gets to 5k RPM. It is set to 4 cylinder.

After doing some research, it looks like I might be able to use that brown/black wire with some messing around.. I'll give it a whirl.

[Steve]

Was just wondering what one of these looks like

http://www.marque.com.au/usedcars/images/1982%20Holden%20Camira%20JB.jpg

Looks a bit like a mk2 cav.

Also looks like they use the 20ne/ 20seh as well

http://us1.webpublications.com.au/static/images/articles/i2/0249_3lo.jpg

[Jack]

I connected mine to the blue connector on the coil, the one on the left as you look at the coil in this pic:

http://i13.photobucket.com/albums/a266/razorjack/Cars/Project%20Ghey/08112008805.jpg

Worked fine then, although that was to a GM dial set.

[c20xeMira]

Ok, thanks. The problem must be the tacho isn't receiving the right 'pulse' that it is expecting. I am sure I can sort it out.

Yeah, the Camira's are J-body cars, and are identical to a US car, but with different lights. I am unsure if there are any UK cars that are the same.

Here's a couple of pics of one similar to mine (which is a Wagon). It won't be quite as fast as a Corsa, but with me in the car and half a tank of fuel, it weighs in at 1150kg after some weight reduction.

This model comes with a C20NE and close-ratio, strengthened F16 box as standard. I am still using the F16 box with it.

[brainsnova]

I connected mine to the blue connector on the coil, the one on the left as you look at the coil in this pic:

http://i13.photobucket.com/albums/a266/razorjack/Cars/Project%20Ghey/08112008805.jpg

Worked fine then, although that was to a GM dial set.


i seen your video on you tube :thumb: very smart motor