Well guess what!

 

I made my tacho work today, and not just work, but function perfectly.

 

I did a mod to the circuit board in the tacho itself.

 

The AE71 has a variable resistor from the factory, so with this you can wind the reading up and down to calibrate. I changed this resistor to one with more variation (0-12kohm replaced with 0-15kohm). I don't know if this part was strictly necessary, but It allows a lot of adjustment.

 

I also swapped a capacitor, and I swapped one other resistor, from a 30kohm value to a 15kohm value.

 

Ill write up a how to for everyone with electronic ignition so you can get your tachos working aswell. Would this be helpful to anyone? I'm not aware of anyone with this kind of ignition who has actually made the tacho work in an xe71 dash.

Edited February 3, 201115 yr by LittleRedSpirit

This would be helpful yes.

 

I know it annoyed me when mine didn't work after doing engine conversion :bash:

Heres a couple of photos to illustrate how I did it.

 

Before

 

After

nice work matt, nothing like smell of hot lead and flux!

Thanks, I just hope the mod helps a few others.

 

I noticed today right at the top of the rpm band you will find the tacho doesnt quite keep up with where I know the motor is, but I also need to adjust it a little more upwards, so will report how it behaves after that. It really is working brilliantly on the whole. I might make a video of it and put it up.

 

works good!

Certainly does. What does it do if you don't modify it after a conversion? Is the needle just slow and doughy to respond to the engines rpm?

It doesnt move, and occasionally flickers when you turn something electric on like wipers, lights etc.

Just received an ebay care package of genuine bits for the ae86. Some disc rear end handbrake cables, stickers for the diff and the timing cover, and a new diff drain bung. Gotta love the exchange rate.

Just fitted one of those awesome reduction gear late model starters to this car, she sounds like a Hilux when it turns over now, its awesome. Its a good design to with the electrical connections between the block and the starter to keep them away from the heat of the headers.

how much were the disc brake cables Matt? need to get some myself

120 us plus shipping. I bought both of his sets.

oh nice... if your looking at flogging one set off give me a yell :)

Sorry mate, the only set Ill have spare is my stretched set from the ae71, I got 2 cars with ae86 diffs that need handbrake cables.

all good mate..