I'm terribly sorry for the delay responding, I had subscribe set, but I didn't get notification for the previous three messages, just the last one.
Fred, I've always been curious about Nissan's electronic dizzies. At one point I was thinking of moving the trigger for the 1UZ's ignition up to the cams and using a pair of EDIS8's to fire the motor (effectively turning it back into a pair of 4 cylinder motors again)
Since the EDIS8 is a waste spark ignition, it has only 4 outputs, and it generates a firing pulse for every 90 degrees of crank rotation, or better said for every 9 teeth on the trigger wheel. So if the 36-1 trigger wheel were mounted on a camshaft drive, it would still tell the EDIS8 to fire every 9 teeth, but now it would be every 180 degrees of crank rotation, so it would be perfect for a 4 cylinder firing pattern.
The disadvantage of that is its not possible to do spark cut rev limit which in boost is preferable to a potential short term lean condition from fuel cut. oems use fuel cut, but they all run 12 psi or less...
If you'd want to dig up some details about these dizzies, I'd like to hear more about them. Most of us here are big fans of Toyota's engineering, but it's always good to know what the other OEM's are doing, and maybe "borrow" a few ideas now & then.......
I'll dig it up soon for you and post here again.
The Nissan Skyline RB25 "distributor" runs from the exhaust camshaft and contains a dual optic hall sensor. The trigger plate is thin stainless and has an outer row of 72 ? slots and an inner row with 6 slots that are different widths.
close, but no cigar, they 4 cylinder or 6 contain 360 slots around the outer edge and the variable length ones for each cylinder. its that variable length that is key.
When used to trigger Autronic or Motec systems I have a new plate laser cut with 6 outer slots for cylinder sync and the inner has 1 slot for reference.
thats normal because to properly software decode these wheels would take a powerhouse of a processor that most if not all ecus just dont have. hence the hardware solution from nissan.
They are a PITA to change the plate as they are non serviceable items with staked brgs etc, but where there is a will there is a way.
oh come on, its not that bad, you're just being lazy
(picture stolen from someone else but...)
I fully stripped mine and modified it for future disassembly. it took a bit of time but was nice to have brand new bearings in it after that many years in a hot engine bay.
I'll find the description.