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5 GT Turbo Renix ignition module tacho output

Neal R19

Well-Known Member
Alright all, does anyone have any info about what is the form of the tacho feed from the renix module to the cluster?

On the 19 (and I guess probably others), there's a pink wire that basically goes from one of the pins on the module straight to the dash cluster to drive the tacho.

I need to know what the form of it is. Some sort of square wave? 12V pulses? Some kind of damped sine wave?

I don't have a running Renix equipped car and even if I did I don't have a scope at home!
 
I need to know what the form of it is. Some sort of square wave? 12V pulses? Some kind of damped sine wave?
It's a inverted banana wave with rainbow sprinkles.

I have no idea.

What I do know is that the Adaptronic output IGN3 won't drive the tacho, and to make it work I had to retrofit the OE ignition pack back in as well as the wasted spark coils just to make the tacho count...er...tach's :D
Be interested to know what you find out though. @am21t 's car is the one with that coil still fitted if you ever cross paths and want to electrocute yourself.
 
I need to know what the form of it is. Some sort of square wave? 12V pulses? Some kind of damped sine wave?
It's a inverted banana wave with rainbow sprinkles.

I have no idea.

What I do know is that the Adaptronic output IGN3 won't drive the tacho, and to make it work I had to retrofit the OE ignition pack back in as well as the wasted spark coils just to make the tacho count...er...tach's :D
Be interested to know what you find out though. @am21t 's car is the one with that coil still fitted if you ever cross paths and want to electrocute yourself.
I've had this cluster apart over the weekend and done my homework on it and I may be able to help you with that...

Sent from my Redmi Note 4 using Tapatalk
 
I can drive the tacho almost directly with an Arduino now.



Dave do you know what your adaptronic puts out as a tacho signal?

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The tacho needs a high voltage spike every cylinder firing. Only works directly from 4 dumb coils or you can use a low voltage supply out of the ecu to load a coil like a relay using a pull-up circuit.
 
Hi,

as far as i know, the AEI unit gets the RPM reading from the magnetic TDC sensor and convert it to a resistance signal (coming out from the top connector), basicley the tachometer reads the electric current that runs thrugh it, if you want to test it give it direct 12V and you will see it spike up (this how the oil pressure and coolant temp. sensors works asswell).
 
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