Can the duty cycle of fuel injectors be re-programmed????

[zzman]

I am on a quest to find better fuel milage with my first 6. 7

I have had a 97 12 valve, 01 24 valve and a 04. 5 cr. Each one got over 22 mpg on hwy with no load.

This 6. 7 barely getting 19. I have 5" straight exhaust, smarty jr w/me and stock size wheels and tires.

It is 4x4 w/g56.



My thought is the injection cycles are alot different than the other engines. Pilot/Pilot/Main/Post/Post

Is it possible to re-program the ecm to specify injections cycle???



The 6. 7 hardly ever puts out any smoke, but the amount of fueling must be simular to the 04 that smoked alot.



It seems I'm using more fuel with 6. 7 than 04 BUT the 6. 7 appears to be burning the fuel off better.



Any ideas with re-programming?

Thanks,

Ron

 

[HBarlow]

You're talking about reprogramming the ECM. In simple terms, that's not going to happen.

 

[zzman]

My thought is if the ECM can be re-programmed with the smarty jr, then why not other procedures?
I guess maybe no one has come out with it to the public yet, if so that is what I'm fishing for.
Looking for a guru that may have figured it out.

My truck came from a dealer already re-programmed to do the same thing the smarty w/me does.
There must be someone who has played with this programming and may know how to acheive my quest.

 

[n7gxz]

It's not going to happen as a commercial product with the way the EPA is now going after the aftermarket for doing DPF deletes and such.

Kevin

 

[Bob4x4]

The 6. 7 has added displacement (above what the truck needs) it will not get better than a 5. 9 while loafing. The smarty does try to do this.

 

[AH64ID]

You're talking about reprogramming the ECM. In simple terms, that's not going to happen.

Weird, another subject you know NOTHING about, yet love to post your false opinions as fact!!

In simple terms, it's going to happen, it's already happening, and it's a publicly sold product.

Any ideas with re-programming?

www.efilive.com EFI Live lets you modify what you are talking about, as well as many other parameters. Timing (main, pilot), duration (main, pilot, post), rail pressure, turbo position, fuel limiters from boost and torque, etc are all part of EFI Live. There are many tuners around the country, or you can tune it yourself.

The EFI software is free to download and play with. I have a stock tune from a 07 6. 7 with a 68RFE I can email you if you want to look at it.

Like Bob said the motor is larger, and will produce slightly more parasitic drag than a smaller motor. People are getting great results with EFI Live thou.

Smarty UDC allows for similar tuning, but is currently only out for the HPCR 5. 9's, but it's release is on the horizon. For the 10+ crowd your current option is MCC from H&S tuning.

I must ask, at what speed did you get over 22 on your 04. 5? Hand calculated or computer? I have extensive mod's to my 05 (same motor) and have only broken 20 once and that was last week. All the mods on my truck make the motor more efficient, yet realistically 22 at highways speeds (unless doing 55) isn't going to happen on these newer heaver trucks, especially a DRW with a flat bed.

I am running smarty's UDC and its amazing what a few tweaks from the box tune have done for how my truck runs. It smoother, cooler, more efficient, quieter, and as a bonus more powerful.

You will find that unless you want additional power you won't mess with the main injection duration, or quantity. It's the timing, rail pressure, and turbo position (boost) that will give you an increase in mileage.

 

[cerberusiam]

If and when EFI Live is available, you will have the ability to completely control all aspects of engine operation. Thats what it will take to reprogram the injectors cycles. That still doesn't change how the programming operates because that is a black box piece of code, but, it would help.

At 19 mpg your doing as well as or better than can be expected with a heavier truck, emissions hardware, larger displacement, and a lower gear ratio. The cost to gain another 2-3 mpg is likely going to be prohibitive, and, ultimately illegal.

 

[AH64ID]

EFI Live is out for 06-09 HPCR's, 5. 9 and 6. 7.

 

[zzman]

WOW, that was fast.
EFI Live seems to be what I am missing.
Now I know it IS available, I need to make plans.
Thanks AH64ID, my mpg was taken from the overhead per short trips and such.
But I do have actual mpg per qtr for the IFTA permit. The 04. 5 was getting 11. 5 for yr 2011. GVW is 34k.
The 08 for 2012 got 10. 4 for same GVW.
Both are from approx 72k miles ea. , loaded, empty and all driving conditions.
I just hope I can gain maybe 1 mpg at least. Save me about $2300 per yr.
Last year I bought 6,919 gal fuel.

Thanks for the info.

 

[AH64ID]

Okay, that explains a lot. The overhead is a called the lie-o-meter for a reason on the 3rd gen 5. 9's. The 6. 7's seem to be far more accurate. I would guess the mileage of your 6. 7 is better than that of your 04. 5.

#ad

 

[cerberusiam]

EFI Live is out for 06-09 HPCR's, 5. 9 and 6. 7.

It may be out, didn't remeber for sure if they pulled it, but now the problem with the emisisons may negate its usefulness. Not sure what EFI live did in response to that mess.

 

[AH64ID]

Yeah I didn't hear one way or the other on their stuff. But looking at their downloadable program it hasn't changed since June.

 

[cerberusiam]

But looking at their downloadable program it hasn't changed since June.

That might be the best news possible.

 

[Bob4x4]

I had a friend running Efi live on a 6. 7. He thought it worked great and ran clean but I think he had a dpf full warning come on. Maybe he will see this and join in

 

[AH64ID]

Part of the problem with tuning for efficiency is that it's not the best tuning for a DPF (assuming it was still operational).

 

[zzman]

I agree some what about the overhead, I think the avg. is flawed for the reason that it registers and averages 99 mpg when coasting.
I use it mainly for a reference point knowing the actual is really something else.

But like I said, in 2011 (with the 04. 5)my actual mpg was 11. 5
in 2012 with 3 months 04. 5 and 9 months 08 it is 10. 4
No doubt I'm getting less with the 6. 7, and not sure how bad the 4x4 will knock it off cause the 04. 5 was 4x2.

 

[AH64ID]

4x4 will make a difference, if it's enough to be 10% I am not sure. But guys with spin free kits get 5-15% better mileage on their 4x4's, and that's just the axle resistance and not the wind resistance too.