Tuning smoke out of giant injectors

[Krazeeun]

Alright, I guess I'll start a new one for this so I don't muck up the tuning for economy thread.

I'm attempting to make 200% over stock exergy's idle with less smoke in our 6.7 pro street truck.

As a whole I took some percentage of pulse width out of the pilot, went a little nuts at first and got it running a bit 12v'ish, gave about half of what I took away back to it and it cleaned up

Also took some PW out of main at the areas where it idled to try and clean it up that way... seemed ok.

However, instead of idling at 14mm3 it idles at 30mm3, better than the 40mm3 it was commanding when i took almost all the pilot away but it's more than I'd like.

Am I going the right direction here? Can I make it idle at the same 10-20mm3 like it did before without the belching haze of giant injectors?

and... begin:

[Joesixpack]

The fuel quantity needed for idle is what it is, you can't take PW away unless you change pressure.

The injectors I run are quite a bit bigger yet and haze very little....I find a single event with a bit more timing and pressure to burn the cleanest at idle however.

[Krazeeun]

Thanks Joe, i'll give it a try tomorrow

[Casey C]

Good info!

[Krazeeun]

PS.. my first attempt at tuning smoke out turned out to be a lopey annoying surging pile of fail... will try again this weekend with new tactics

[duck_04]

PS.. my first attempt at tuning smoke out turned out to be a lopey annoying surging pile of fail... will try again this weekend with new tactics
LOL

[2007 5.9]

Pilot timing and mm3 can make a huge difference in smoke control.

Pilot pulse is important but timing is critical.

[Joesixpack]

**** re-read my post and starting from a cold start a pilot is going to be better for sure I use two pilots and split the main. However once its to operating temp I find it makes the least amount of haze with one event.

Timing really does make the difference, and being able to tune it in real time is sweet. One thing you want to watch is not ramping the pilot quantity up to much when the engine is cold as its a fixed quantity and when the engine warms up this amount can be higher than what is required to idle.

[Cobra 19 & 54]

PS.. my first attempt at tuning smoke out turned out to be a lopey annoying surging pile of fail...

now that's sig worthy right there!

[IdahoRob]

PS.. my first attempt at tuning smoke out turned out to be a lopey annoying surging pile of fail... will try again this weekend with new tactics

That is awesome that you are trying things with this software. You will learn very fast on what works and does not. This is one of the best things about EFI, the end user can tune for their own needs while sitting in the seat. This is how we all started.

[Krazeeun]

ok, back to stock idle settings... going to bump rail pressure at idle a tad for starters and not change so much at once as that just seemed to piss it off...

You guys say timing makes a huge difference to control smoke at idle... pilot or main and advanced or retard?

[BIGRED08]

pilot and advance.

[2007 5.9]

Careful with increasing pressure, as this has a effect on the cells in the duration table. If you move pressure up enough to move into the next PW cell then youve essentially increase pressure and added PW all at the same time, which can give you an even smokier setup.

[Krazeeun]

i only bumped the 4xxx's up to 5k even and smoothed that corner... we'll see how it works

also killed post injection all the way

and.. if i want to kill pilot after 2500rpm, can i just enter value of "0" in the "Pilot 1 Quantity, Base" table in the rpm/mm3 i want it killed at?

[2007 5.9]

also killed post injection all the way

and.. if i want to kill pilot after 2500rpm, can i just enter value of "0" in the "Pilot 1 Quantity, Base" table in the rpm/mm3 i want it killed at?

You can do that, however it has been suggested that you "0" out the mm3, and timing in the area you wish to turn it off at.

[Krazeeun]

I don't have access to post injection timing yet (6.7) AFIK...

[2007 5.9]

Correct, I was addressing your pilot question.

With post, if you zeroed the tables that you could, then thats fine. You could log post mm3 to verify that it is indeed gone.

[Krazeeun]

Thanks brother