Can I do sequential injection with a MegaSquirt® EFI Controller?
A. There are two common sorts of injection: • Throttle body injection – usually one or two injectors for the whole engine • Port injection (aka. Multi-Port) – one injector per cylinder Then there are three common modes of injection timing: • batch – all injectors fire at once, but not timed to any specific cylinder event, • bank – the injectors fire at once, then the other , and so on, but not timed to any specific cylinder event, • sequential – each injector fires at a specific point in the 4-stroke cycle for each cylinder (i.e., 8 independent timing events) Throttle body injected cars are usually batch or bank fire, simply because of the geometry. Most port injection set-ups before the mid-1990s were bank fire as well (including GM Tuned Port Injection for the 305/350). Sequential injection requires: • at least as many injectors as you have cylinders, with one dedicated to each cylinder (i.e., not a 4 injector TBI on a 4 cylinder). • as many injector drivers as you have cylinders, •
