Fully sequential - firing order and wiring

[Rickster]

I think I already know the answer to my question, but I want to ask first before I re-do my wiring.

I am running fully sequential fuel and spark via MS3X. I was poking around tuner studio and noticed that I had the ability to set the firing order once I set it to use full sequential. I (blindly) assumed that this would allow me to set the order in which the coils/injectors fired. So, I wired the coils and injectors in the same order as the cylinder numbering thinking it would make it much simpler to set the firing order once I got to setting up my project. So I wired cylinder #1 to injector/coil A, cylinder #2 to injector/coil B, cylinder #3 to injector/coil C, etc..

Reading through the documentation today it sounded like the MS3 ignores this for the coils and simply fires them in sequence (A, B, C, D, etc...) irregardless of what the firing order is set to in TS? I read also that the firing order settings are only used for the injectors? Why would that matter for fully sequential? The injectors would/should always fire with their respective coil...shouldn't they?

This just seems kinda backward to me if this is indeed how it works (and is a bit misleading at first glance).

Will I need to re-do my wiring to resolve this?

Thanks,

Rick

[dontz125]

I agree it's a bit confusing, but here's my understanding: The main channels fire in sequence A-B-C-D, and it's up to you to hook them up to your cylinders 1-3-4-2. Where the cylinder labels come in is for your TRIM tables; declaring that channel D goes to cylinder 2 means that trim table #2 adjusts what happens to cyl #2 on channel D, and declaring that channel B goes to cylinder 3 means that trim table #3 adjusts what happens to cyl #3 on channel B.

If you have the wrong channels going to the wrong cyls, you'll have to ask yourself if you can live with it. If you can't, you'll have to rewire.

[racingmini_mtl]

Always wire injectors and coils according to your firing sequence as they will always fire in sequence A-B-C-D... The firing order input is, as Don says, for assigning the trim tables to the correct output; it has no impact on the output firing sequence for either the injectors or the coils.

So you indeed need to re-do your wiring.

Jean

[Rickster]

I see, not much sense running sequential if you don't have the firing order correct. Guess I'll be revising my wiring harness tomorrow...

Thanks for the explanation.

Rick

[Raymond_B]

So to be clear, if you have this firing order;

1-3-7-2-6-5-4-8

you wire like so for injectors and coils;

A - 1
B - 3
C - 7
D - 2
E - 6
F - 5
G - 4
H - 8

[dontz125]

Correct.