Injector sequence

[PBU]

These are my settings.
Four cyl 1342 ignition sequence.
Wasted spark with dual fire Bosch coil connected to output 2 and 1.
Output 2 for cyl 1 and 3 and output 1 for cyl 2 and 4.
Engine is running good.



So when are my injectors injecting exactly ?

[Kurt]

I made a post in another thread.
viewtopic.php?f=19&t=154

IMO, injector timing is poorly implemented with the EMU at this time. It took a test bench and oscilloscope to figure out! There is no advance vs rpm table and it's timed for start of injection instead of end of injection. If it were end of injection and we had a 3D RPM vs Load vs Inj. Adv. table then we could tune for a lot better/cleaner running. This would be especially good with VVT, allowing us to time injection after overlap.

[PBU]

I made a post in another thread.
viewtopic.php?f=19&t=154

IMO, injector timing is poorly implemented with the EMU at this time. It took a test bench and oscilloscope to figure out! There is no advance vs rpm table and it's timed for start of injection instead of end of injection. If it were end of injection and we had a 3D RPM vs Load vs Inj. Adv. table then we could tune for a lot better/cleaner running. This would be especially good with VVT, allowing us to time injection after overlap.

I think you are right.
Maybe an idea for next software.

If i understand correct from my table.
Injector 4 start to inject at cam signal 60° before spark in cyl 4.

If this is correct my settings are wrong.
The ign event should be (top to bottom) 4321 as diagram below.

[chris72]

Ahh thank you Kurt for your explanation
In my example my first ignition event will be 60 degrees after tooth 10 as set in primary trigger, this must be ok as i have checked with a timing light zero advance = TDC.
So the injector assigned to ignition event 1 will open at tooth 10 and NOT at TDC as i had assumed.
Is my understanding correct ? If so this should mean with 0 offset i inject 60 degrees BTDC on the selected event / injector combination

[Kurt]

It's based on the First Trigger Tooth option (in Ignition - Primary Trigger window). If your First Trigger Tooth is set to 10, and you've sync'd timing with Trigger Angle of 60, then tooth 10 is 60° before TDC compression. With Injection Offset set to 0, the injector assigned to ignition event 1 will START at the trigger edge of tooth 10, which is 60° before TDC compression. This means that end of injection happens at some point after tooth 10. I don't know if you're going to find a happy compromise between starting, idle, cruise, and full load. I've been setting it to inject on a closed valve so all starting fuel is inducted on the first cycle. Could be better, but not in it's current form.

[Jadzwin]

We plan to add 3D end of injection angle table soon.

[PBU]

So these should be correct for a 4cyl engine with 1342 ignition ?

[chris72]

Thanks Kurt
you have helped me understand what is happening, with my application ( drag race only ) i dont need to worry about much apart from full throttle performance and starting lol
PBU from your examples i belive both will run without problems, but as Kurt has said each example will be a bit of compromise. I have had the bike running and runing well with totally incorrect injector timings as all that happens is that the fuel hits a closed valve as long as the spark is in the right place it will run.
I am hoping to inject during valve opening as i run high octane leaded fuel which can be prone to poor atomisation and puddling in the inlet,also low engine temperature so i need maximise atomization.
For your application it may be worth trying both versions to see which is best, also consider trying the prime pulse option as it can help starting.

[Jan32]

@ PBU
in your example is somethin wrong, because you use the real ignition events (in EMU ignition outputs). At EMU in injector phase settings you have to use the ignition events compared with Ignition outputs.

Than the following assignment is right compared with your first table (available inj time 270°) Inj1 = Ign event 3; Inj2 = Ign event 2; Inj3 = Ign event 4; Inj4 = Ign event 1;

Im pretty sure, or is it wrong?

[eugen_troll]

Whats is a coreckt Injektor Phase for my Setup?

thx

[killerbee]

This was one of my firsr questions when get Emu , conection between firing order and injector events . What will be the bes for power ans idle for 6cyl bmw . Firing order is 6 4 2 1 5 3 so when ti fire injector 1 ? Now i fire it with coil 6

[killerbee]

Sorry for my writing , someone can have it as spam but I see major mistake in my car so after reading this post I assume that if firing order is 1 5 3 6 2 4 ( number of cylinder ) then injectors must squirt 2 events earlier or 2 4 1 5 3 6 ( number of inj )

or injector phase 1 must be when injector 1 start to squirt , then 2 events before its spark is firing cyl 2 but cyl 2 spark is ignition event 5 so inj phase 1 must be set to ignition event 5

And if I think right here is what must use ( attached pic )

But if we look at engine cycles it is better to start injector 1 with the spark of coil 3 and then injectors phases must

[eugen_troll]

I wont Injecting Fuel in Copression Phase.
Is this setup right?

Engine is CA18DET.

Big THX for Help

[eugen_troll]

I wont Injecting Fuel in Copression Phase.
Is this setup right?

Engine is CA18DET.

Big THX for Help

?