Last edited by Willys43; 04-19-2016 at 07:02 AM.
To even give it a chance of working you will need two coils and a dual coil isolator (usually found in endurance and NASCAR racing}. The isolators are usually used to switch from one ignition system to another in the case of an ignition failure situation, but I don't see why it can't be used with two active ignitions systems.
The man who says something is impossible, is usually interrupted by the man doing it.
They should as long as RPM isn't too high. Minimum angle between cylinders is 90 degrees just like a V8. Six cylinder dwell is 30-35 degrees so if spark advance is limited to 30-35 degrees max I would not expect a problem.Dual ICMs and single coil will not work.
Years ago I tried to build a non-computerized HEI for high RPM use. I used a high voltage diode in each coil wire. Each coil was controlled by an independent HEI module connected to a four cylinder pickup coil. It seemed to work ok.two coils and a dual coil isolator
what route did you end up taking?
Two 1227747 computers, both modified for chip flashing, one controlling odd # cyls and IAC, initial spark set to 0* in computor, the other one controls even # cyl without IAC, with initial spark set to 90*, 1 odd fire hei distributor with three of six pickup points ground off, 2 ignition modules, all shared sensors except engine temp and O2 sensors
Last edited by Willys43; 08-08-2016 at 01:41 PM.
Congratulations!!! How long before you can start driving and tuning?
I'm curious about your data logging and tuning plans? Identical VE Tables in both '7747's? Identical Spark Table in both 7747's? Two Laptops with two ALDL cables? One Laptop with two TunerPro RT sessions running?
Very interested, lots of cool factor. what's the firing strategy,IE: will tach signals be right? is three cylinder firing possible on 7747? curious to learn how those things are gonna share fueling/mapping. I love oddball stuff, especially bringing it into the modern age........
Im planning on staying with idntical tables, spark and ve. The laptop i have isnt much. I'll start without the ability to compare one ecu to the other. The harness has an extra injctor wire in it so I can change 1 wire and run both injectors off the same ecu if nescesary. I'm probably just going to drive the same route twice and log both just for grins and see what I get. Really accurate comparison isnt it? I lke the idea of 1 laptop, 2 cables, running to copies of Tunerpro RT. I just hate to buy another laptop. I could tune it ith 1 ECU controlling the fuel the prgram both ECUs the same and switch the injector back. Actually I don't think it should matter much which way I do it.
Last edited by Willys43; 08-08-2016 at 05:19 PM.