Best approach with 6 cylinder - 4 injector drives

[mack85n]

Which would be the best approach to wiring a 6 cylinder engine with individual injectors on an ECU (Link G4+ storm blue) that has 4 injector drives? 

Also what what is the idea behind batch injection being adjustable to have injection occur every 360 or 720 degrees of rotation. If tuning a traditional fuel map would injection durations be double for a 720 injection as opposed to 360 degree. 

Just looking for further explination on the tuning approach to this.

[Adamw]

I would set it to sequential and wire for a semi-sequential operation:

 

In real life there is usually very little noticeable difference in how an engine will run when comparing semi-sequential to multi-point group mode, but with semi-seq you may be able to achieve a slightly smoother idle and very light load operation.

In 360 mode your injector has to fire twice as often so pulse widths are halved and you have twice the dead time per cycle, this becomes an issue mostly only with very large injectors but I still suggest always use 720 mode if you have capable triggering. 

[mack85n]

I would set it to sequential and wire for a semi-sequential operation:

 

In real life there is usually very little noticeable difference in how an engine will run when comparing semi-sequential to multi-point group mode, but with semi-seq you may be able to achieve a slightly smoother idle and very light load operation.

In 360 mode your injector has to fire twice as often so pulse widths are halved and you have twice the dead time per cycle, this becomes an issue mostly only with very large injectors but I still suggest always use 720 mode if you have capable triggering. 

thanks,

 

i have base line specs for injection duration for the injectors I intend to run if set up as a fully sequential injection system. Would these inputs be the same for a fuel table on 720 degree injection in semi sequential ?

[Adamw]

Yes, pulse width for a semi-seq setup will in theory be the same as a true sequential set up. 

[CamB]

If you have this setup, how is it best to approach setting injection timing? The typical method is to tune by AFR but 1/2 the cylinders will be different?

In my case, I may be looking at this on a flat 6 with two lambda sensors and ITBs, so can probably try and pick injection timing that matches (and I suspect it is slightly before valve opens on 1 / 3 / 5 which is 120 deg later on 2 /4 /6, although there is probably also an injection timing that would see both inlet valve "pairs" open if that was desirable).

[Adamw]

At idle and very light loads you can tune the injection timing using lambda, in this semi-seq case you would be aiming for lowest combined or averaged lambda. At higher loads it is generally tuned by torque output.  With semi-seq I suspect the difference between optimized timing and not optimized will be pretty subtle (~1-2%) so you may have trouble actually noticing anything.  Generally with mild overlap engines you will only see noticeable effects from injection timing below about 40% DC so I wouldnt both tuning beyond there.

[CamB]

Thanks - appreciate the advice.

It's a high overlap 2 valve engine with ITBs so it might be sensitive. I guess I will find out...

[CamB]

Sorry for digging up an old thread, but directly relevant to the above. If wired up as below, and there was a need to run the engine without the cam sync temporarily, would be the best alternative be multi point, 360*, and halve the master fuel (hoping deadtime are accurate)?

 

Edited March 5, 2017 by CamB

[Simon]

You should be able to just select multi point group and should not need much else maybe a slight fuel trim.

 

[OGtrent]

 

I would set it to sequential and wire for a semi-sequential operation:

 

In real life there is usually very little noticeable difference in how an engine will run when comparing semi-sequential to multi-point group mode, but with semi-seq you may be able to achieve a slightly smoother idle and very light load operation.

In 360 mode your injector has to fire twice as often so pulse widths are halved and you have twice the dead time per cycle, this becomes an issue mostly only with very large injectors but I still suggest always use 720 mode if you have capable triggering

hey guys new to the forum i'am currently wiring in a G4 storm in to my ER34 rb25det neo the ecu had previously been wired for a rb25det s2 not knowing how they previous owners had wired the car im guessing its how you have mentioned in this thread as semi sequential injection i just want to be sure that a G4 storm is compatible to run semi-sequential injection and whats the best way to wire it up cheers

[Adamw]

Yes this would be the way to do it if you are starting from scratch.  If it is already wired for batch fire then you will probably find it will run perfectly fine like that to.  Semi seq you might be able to get slightly smoother idle and sometimes a little smoother run at light loads.

[dc123]

old  thread but im wring an atom ecu onto a 2.9 boa v6 ford engine with firing order of

1-4-2-5-3-6

so 

cylinder 1 1 & 6

cylinder 2  4 & 3

cylinder 3 5 & 2 

not 100% sure on this

[Simon]

Assuming you have a cam sync and can run semi sequential then 

Drive 1 to 1-4

Drive 2 to 2-5 

Drive 3 to 3-6

[dc123]

on this engine there is no cam pick up although i can design one easily enough, out of interest can you still run this engine without a cam sync?

[Leiden]

Without a Cam Sync you can run it with Wasted Spark Ignition and Batch Injection or you can run it as a '3 Cylinder 2 Stroke Sequential' with Injectors and Ignition outputs paired for cylinders that are at TDC together (360 degrees apart in the firing order). I used to run my engine that way but had trouble getting the idle mixtures lean enough since the Injectors are firing twice per '720degree' cycle.

[dc123]

ok thanks, so when using batch fire do i still wire it like semi-sequential from the previous post ? batch fire does not show up on mine but i am guessing multi-point group is the same thing?

[Simon]

Batch = Multi point group.

[dc123]

On 11/26/2019 at 8:07 PM, Simon said:

Assuming you have a cam sync and can run semi sequential then 

Drive 1 to 1-4

Drive 2 to 2-5 

Drive 3 to 3-6

thanks simon and wire it the same as what you said before?

[Adamw]

8 hours ago, dc123 said:

thanks simon and wire it the same as what you said before?

With multi-point group the wiring is really no longer relevent as the injection event is no longer timed to the intake valve event, so you can pair them up in 3 groups of 2 or 2 groups of 3, will work fine either way.

[Leiden]

If you are grouping injectors make sure the total current on each output channel does not exceed 5A. If you have 3 injectors on a single output channel the injector winding resistance should be at least 9ohms.