Setting up Paired injectors with ms3x

[quark2501]

Hi Guys

A simple question? How do i setup 6 injectors on a 6 cylinder engine only using 3 injector outputs? Wasted fuel as some call it.

[pit_celica]

If the topic title is OK, you are have a MS3X. If that's the case, then why you do not want to have sequential injection? The MS3X has 8 injector outputs.

Sam

[quark2501]

Simply because I use a breakout board and it's wired that way from the factory.

[prof315]

What's the firing order and how are the injectors paired from the factory?

[quark2501]

1-5-3-6-2-4

It more a question how I setup only to use 3 outputs on ms3x istead of 6

1JZ_EFI_Wiring_JZA-70_-_Full_Diagram.jpg

[prof315]

I'm not sure if you can run 3 of the 3/X injector drivers on a 6 cylinder engine. You could use the 2 Mainboard drivers and modify the wiring slightly in the factory harness..... Also are you running the stock injectors? I ask because I believe stock are Low-Z and won't work with the 3X drivers anyhow.

[quark2501]

1jz are high, but it runs 550 ccm 2jz injectors and a resistor pack

Don't want to mod the wiring. Will it work in batch fire when using all 6 off them in software but only using 3 irl.

[dontz125]

If you have a missing tooth wheel but no cam sensor and are running wasted spark, select Sequential / Semisequential and you will be squirting twice per cycle on channels A, B, and C.

If you have a cam sensor and are running (or at least COULD run) COP, select S/SS as above, but lie in the req_fuel window and enter an injector size of 1100cc. Wire each pair of injectors to the two corresponding injector channels - 1-4, 2-5, 3-6. This way, each injector pair will receive two half-size signals per cycle.

[dontz125]

I think I out-clevered myself on that one. Select S/SS, and enter that you have *3* 1100cc injectors. This will give two squirts each on channels A, B, C.

[quark2501]

Thank you