1 => 1
8 => nothing
7 => 3
2 => nothing
6 => 4
5 => nothing
4 => 2
3 => nothing
and then disable DTCs & fault flags for 8, 2, 5 & 3.
By your logic, if it works as I'd imagine it, each cylinder will receive a spark during the exhaust stroke which won't make a stick of difference such as in all wasted spark systems but it would also get a shot of fuel during the exhaust stroke & I'd imagine that would produce somewhat unwanted results.
From the small bit of research I have done looking into this it should be possible to wire up the coils & injectors as I have stipulated above, as well as disable the DTCs & fault flags for the missing cylinders and simply work assuming you provide it with the correct crank & cam position signals.
Then comes the sticky bit as mentioned by antus earlier:
But, if you could get correct data into those tables then any custom/programmable V8 binary will work once the DTCs, flags and tables have been set accordingly.antus wrote:It would take a quite a bit of tuning, as it'd be set up for the amount of air and advance a v8 is expecting, and thats probably the biggest reason people dont do it. There are a lot of tables in those PCMs, and its a lot easier to start off with a pretty close platform and not need to change most the calibration. Moving to a 4cyl would be more work after you got the hardware working.
Well, that's the way I see it, but I'm no expert.
Chuff