Cauf61

Hello everybody

I am going to try ( as a project ) to make a mechanical/electronic wasted spark ignition system.
That means keeping the rotor and dizzy but not adapting the software or ECU.
Only use for the dizzy and rotor will determine the position of the crankshaft.
It’s using an optical reflection sensor who’s detecting the position of the rotor. This is going to drive an DIY electronic circuit that’s dividing the ECU spark timing signal to two power switch transistors with dwell regulation and two coils ( one for plug 1 and 4 , one for plug 3 and 2 ) for the 4 sparks.
So no need for the expensive ECU adaptation kit and software , only the electronic circuit and the wasted spark coil.

Anybody has tried already to go this way ?


Grts
Patrick

john_3.0s

Will be interested to see how this works out!good luck

Cauf61

Made a little bracket to put the module on and adapted the rotor.


[IMG]https://passionford.com/forum/<a href=http://s1008.photobucket.com/user/cauf61/media/20140913_101855_zps0975ec5b.jpg.html target=_blank>







[IMG]https://passionford.com/forum/<a href=http://s1008.photobucket.com/user/cauf61/media/20140913_101820_zps33a61a14.jpg.html target=_blank>

[IMG]https://passionford.com/forum/<a href=http://s1008.photobucket.com/user/cauf61/media/20140913_123239_zps91f16fb4.jpg.html target=_blank>

Cauf61

The stainless piece is polished to max reflection.
Make everything as symetrical as possible to not disturb the balance of the rotor.
Use the same 3 screws.
It's turning at 3000 rpm.
The dimensions are not super critical as it's just needed to indicate which set of cylinders to fire. 1 and 4 or 2 and 3.
I made it the same width as the largest part of the rotor.
Exact timing is done by ECU and stays as standard.

Cauf61

Glued in the reflection sensor.
It's a ir led diode and transistor.
As you can see it's in line with a HT connection.
I used an old dizzy cap and cut out the HT connections.

Cauf61

The first test whent fine.
On the picture you see the ignition signal divided in to two signals for the two coils.
It's the position of the rotor thats send the signal ( and spark ) to cyl 1 and 4 or 2 and 3.
The timing is not altered and produced by the marelli ECU.

Cauf61

Coil has arrived. (Bosch dual fire)
Adaptation of the dizzy ready.
Glued the wires for protection and vibrations.
Also mounted a connector.

tony66

iTrader: (7)

not being critical but the more accepted method of wasted spark does away with the use of the dizzy/mechanics of it,you still need it for your system..

will you see a far stronger spark than a group a coil/fresh leads and cap?

do you think it will be as good as the normally available double amplifier kit with modded ecu?

will be good to see your results