3.2 Injector batch squirt question

[drl911]

If the firing order of the flat 6 is 1-6-2-4-3-5, why did Porsche batch squirt cylinders 1-2-3 and 4-5-6 as groups? Is there a batch squirt to each bank every crank revolution or every other revolution? If a bank is getting a squirt every other revolution, that leads to a relatively huge difference in time delay before the respective cylinders of a group consume the fuel. For example there is a 600° firing difference between cylinder 1 and 3, but one squirt. Am I missing something?

Megasquirt 3 pro has the option to set up as semi-sequential but requires pairing the injectors. I would like to pair them like the firing order 1-6 and 2-4 and 3-5. This would result in a 120° difference in firing between grouped injector pairs with one squirt.

Thoughts?

Thanks,
Dan

[Ferrino]

I've been trying to figure this out myself and there is conflicting info out there. Some folks say the Motronic injection is "bank-to-bank" and alternates between bank 1 (1-2-3) and bank 2 (4-5-6). I assume they would get 2 squirts per cycle (1 squirt per revolution).

But Sal Carceller, who has clearly devoted much time to the Motronic system, has stated that all 6 injectors fire simultaneously (again, divided over 2 squirts per cycle).

[drl911]

Megasquirt support forum member said to pair them as 1-4 and 6-3 and 2-5?!?!? Which would put pairs 360° apart. I'm pursuing the reasoning behind this approach......

[drl911]

"But Sal Carceller, who has clearly devoted much time to the Motronic system, has stated that all 6 injectors fire simultaneously (again, divided over 2 squirts per cycle)."

That means true batch squirt!

They are definitely wired separately, bank 1 vs bank 2. Perhaps wired like this just for electrical load carrying reasons and all still fire at the same time/duration.

[Ferrino]

Yes, I think you have the correct pairings for semi-sequential. This link should help explain semi-sequential injection.

They are definitely wired separately, bank 1 vs bank 2. Perhaps wired like this just for electrical load carrying reasons and all still fire at the same time/duration.

I was thinking the same thing - wired like this for convenience, but giving the illusion of bank-to-bank injection.

[drl911]

Originally Posted by Ferrino

This link[/URL] should help explain semi-sequential injection.

Awesome link, thanks so much!

Realizing that they squirt half as much every rev, makes it all logical and plausible for me.

I can finally get back to wiring in confidence.

[Ferrino]

What setup are you using with your MS3? ITBs?

[drl911]

Carrera intake/throttle body with Vortech Supercharger.