Adaptronic - tacho mod?

[Jonny Rochester]

Adaptronic
4 1ZZ-FE coils,wasted spark
3rd ignition output from Adaptronic is for the tacho
AE86 dash


Tacho is not working yet. Do I need to mod the dash with 2 resistors and a capasitor? Or should it work anyway? In the software, there are 2 settings for the tacho output. 50% DC or 1.5ms. I had a Adaptronic working with a dash previously but that was with a dizzy, I think.

[steroidchickens]

when i did mine the only way i could get it to work was pull up through a resister in a relay.
i found that with the tacho wire conected it would only read with a test light on + and other end on tacho wire. so after using a relay to pull up the signal, the tacho was reading half the revs of what it should have.

andy has released more firmware. this uses aux out as a tacho output. just more options for tacho. there is a 4 cyl 6 cyl 8 cyl ect. i just changed from pull up tacho to 4 cyl tacho and it is all sorted now.

dont know why the 3rd ignition output diddnt work as tacho.


dont know if the new firmware is up yet but rob emailed it to me. pm me email address and i can send it to you if you like.

[Nikkojoe]

This should help you.

For twin coils (wasted spark) so will work for you.

[biggo]

What steriod said.

Im using firmware 1.0N

Select an aux out as tacho, wire the aux and tacho to the neg side of a relay and give it 12v on the other. Works perfect. I think later firmwares have the option to select 6/8 cyl?

email rob knox at if you get stuck.

[H8CHIR6KU]

i just put the tacho output to the tacho. worked straight away. same setup as what you posted

[Jonny Rochester]

Thanks everyone. It seams there are a few ways to do this. I ended up getting the dash cluster apart and replacing 2 resistors and a capacitor on the tacho circuit board, as per the "ae86gzetacho.pdf" floating around. There is one mistake in that article. Is says "472 replaced with 473" but it should be the other way around. I got lazy and bought the wrong capacitor, I bought a 473 instead of a 472.

But, it seams to work anyhow.