Standalone ignition system with Nissan CAS internals

[z1 zonly]

I am attempting to create a self-contained ignition system using the trigger wheel and optical pickup from a Nissan CAS.

Those familiar with the CAS will remember that there are 360 slots on the outside of the trigger wheel that are read by their own optical eye to detect cam position. Another optical eye detects the inner slots representing each cylinder (each cylinder has its own specific-length slot that is measured against the outer slots on the trigger wheel to identify the individual cylinder and send spark accordingly).

Here's a graphic:



The application is an air cooled, carbureted, two stroke, two cylinder motorcycle with the cylinders timed 180 degrees apart. I plan to use a 4-cylinder Nissan CAS trigger wheel and block off two of the inner slots to create 180 degree two-cylinder firing signal.

The most important aspect, and whole reason for this system is to obtain digital control over timing maps (program timing at various points along the RPM band). There are some options available that cater to EFI setups (Megasquirt), but this box needs to be very lightweight. There will be NO inputs except for the two optical sensors (5V each)--no throttle positioning, no tach signal (unless the outer ring of slots acts as a tach signal?), etc.

So, (whew!), is there an ignition control module available that would fit my needs? It needs to:1) Recognize the Nissan system of optical sensors, or have the capability to be loaded with firmware that does (1a - where can this firmware be obtained?).2) Be COMPACT! These bikes aren't big and don't have many places to mount accessories.3) Offer modulation of timing throughout the RPM band and be easily programmable using a laptop or hand controller.

Thanks in advance for any insight!

[dimedriver]

MegaJolt jr. could but it needs a 36-1 wheel on the crank and the ford EDIS stuff. (last time I checked)

If your into programming and electronics build it yourself.

You could use this board its cheap and comes in many sizes.http://www.arduino.cc/small one-->http://www.sparkfun.com/commerce/produc ... ts_id=9218

These coils have built in igniters you can find them cheaper I think they are on 04 and up Chevy pickups with V8's. They are pretty small and put out tons of power.http://www.jegs.com/i/MSD+Igni...02/-1

This could probably be built with less than $40 bucks not counting the coils. You may need some 3904 npn transistors to adapt/amplify signals and maybe a lm7805 for a 5volt power source.

If your still interested I could throw together a schematic for you.

Also adding sensors like a TPS or MAP and a engine temp would greatly improve drive-ability.TPS or MAP would allow the ardino to chose a diffrent timing map based on engine load.The engine temp would allow it to have a special map for startup/warmup and if the engine over heats it could retard timing to keep you from knocking.

A rev limiter would be really easy to do with no extra sensors. Tack outputs and shift lights are also very easy.

-dime