UGH! need to squash SFI/batch fire argument

[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.

[Playtoy_18]

http://www.fiero.nl/forum/Forum2/HTML/075502-13.html

Curious myself.
So it does drop SFI and go batchfire or it doesn't?
(not counting direct injection,only port/intake injected.)
I had never heard this till I saw it in above thread i've been following and remembered this thread.

[EagleMark]

A GM engineer told me the SFI in an LT1 was only done for emissions, did not need it in 94 but 94 would pass 96 emissions tests... and do to time it is batch fire by 3000-3500 RPM. In the code it has to do with Sync and Async fueling as well as time available per revelution, as RPM increase this time decreases and there's not enough time to SFI at that point. Wish I had the proof...

[RobertISaar]

Mark, you have a dual channel scope?

[EagleMark]

Yes but nothing to test it on... plus I'm in Portland for who knows how long...