Ok, I just ordered a megasquirt 3 with the 420A setup from RS-Autosports. The question I've had for a while (and have seen conflicting info on) is how megasquirt handles the injector drivers.

On their site it seems to indicate that it's firing -each- driver every crank rotation, so most of the injectors are firing on closed valves, correct?

Or is it reading the crank position and firing them at about the right time?

The reason I'm asking is because if it's firing them with no particular ryhme or reason, then I'd like to put all the port injectors on one bank and fire them at the same time (getting much the same result), so that I can use the other driver to run a set of smaller injectors that I can more easily tune for cruising and idle.

Thanks

*bump*

Nobody knows, or is my question unclear?

You set it up to fire how you want. You can have all of them fire at once or you can do a batch fire where 2 fire then the next revolution the other 2 fire. MSnS has a very good install and set up manuel that explains it in great detail.