Your ignition timing needs to be spot on. With dizzy type ignition, in this case at the end of the exhaust cam, there is a degree of "spark scatter" for want of a better term as a result of belt stretch/oscilation throughout the rpm range which can't be predicted.
The dizzy system pickups are in the dizzy, hence the stretch influence.
In addition to all the advantages of wasted spark mentioned previously in this thread, you will have your trigger sensor on the crank. This sensor tells the ecu exactly when to fire so no influence from the belt at all.
You will need a second sensor to identify / reset home position. Will this be fitted on the crank aswell or will you use the dizzy for this? Iether way is equally effective as the exact timing of this sensor is not critical. It needs to detect and send a signal at roughly 60deg BTDC purely as a reset function so the ECU never "forgets" when number 1 cylinder is ready for spark. The crank trigger gives the exact firing timing message to the ecu. The ecu then sends out a spark signal to the ignitors per the loaded ignition map.
All in all, I reckon with good tuning you'll have a smoother running engine, much more reliable ignition system and potentially gain a little power.
Additional note : in the pic in the previous thread you can see the distributor is still fitted. It's sole purpose is to send a home signal to the ECU running wasted spark. It will have only one tooth on the pickup wheel which will send a signal every second crank revolution when piston 1 is ready to be fired.
Also, the belt is fitted the incorrect way around for all that comments worth.......
Last edited by Crazy Toys (2009-08-29 07:31:20)