UGH! need to squash SFI/batch fire argument

[34blazer]

Pretty simple question....

*disclaimer* I dont believe this is true but cant find docs to back it up

Does all GM ECM/PCMs drop SFI above ~3000 rpm and switch to batch fire?

Im certain its a big NO but again, no docs to back it up.

*edit* did not specify but meant if the ECM/PCM is SFI

Thanks!

[1project2many]

Technically, no. Why? Because direct injected engines are SFI and the injection pulse has to occur at the correct time to work with direct injection. Everything I've read regarding injection into the intake indicates that SFI mode stops somewhere around 3000-3500 rpm.

[34blazer]

Ok well that settles it. I remember someone stating(RBob?) that sequential, I think the LC2 platform fires the injectors 2 per 2 revolutions no matter what RPM.

[1project2many]

Are we gonna win a bet?

[34blazer]

Are we gonna win a bet?

LOL i wish!

[RobertISaar]

i've never seen it happen, but i don't have a scope either, let alone a dual channel one.

i've also never found any code that would imply it to happen.