Join Date: Aug 2007
Location: South Australia
The reason why you can't, with the standard TS Motronic, is that the computer only outputs a single ignition signal per firing event. For waste spark ignition on a 4 cylinder, there needs to be 2 completely separate signals. So 1 signal would trigger the ignition modules for cylinders 1 and 4, and the other signal would trigger the ignition modules for cylinders 2 and 3.
The ECU just cycles 1 -2 -1 - 2 -1 -2......... based on the missing tooth reset of the CAS.
Ultimately the version of the Motronic that Alfa used, is just too simple (they didn't even use linear TPS for acceleration enrichment). The Alfa spec version of the 4.1 fire all of the injectors all at once, even on the V6 engines...........
There was some chat about the front wheel drive (so later) versions of the 8 valve TS using waste spark ignition. If you really, really wanted to go COP and keep the Motronic, that'd be a start.
But having said all of that, the ignition system isn't going to be the power limiter of the engine, anyway.
You'd get better results from being able to specifically tune the ECU to suit your engine. He hasn't been real active lately, but PM Festy, he has been developing a real time tuning interface for the Motronic 4.1.
Slowly Progressing Vortech Supercharged 1990 Alfa Romeo 75 Potenziata. Out of Action Twin-Charged 1988 AW11 MR2. Current Daily Driver, The Glorified Taxi 2006 BF FPV F6 Typhoon.
Last edited by Duk; 09-12-2014 at 07:14 PM.