GDE vs EOC/MR

[biodiesel]

Is this something that's been verified? As far as losing power and economy?

Yes. Not only has it been verified, but customers could notice it. As a matter of fact, EOC stopped deleting the swirl valve function because it was known to be more of a detriment than a positive.

Here are a few quotes:

"Without swirl valves you tend to lose about 1 to 1.5 mpg in city driving (below 2200 rpm in light medium load range). Keep in mind the cylinder head has one tangential port and one helical port. Without swirl the helical port is not being utilized properly. Technically one would need a new cylinder head design with different port geometry to have optimization without the swirl system." – Keith

“We do not alter swirl settings in tuning regardless of egr, air motion is critical for more even combustion. Google may not be my resource of choice for engineering information. The chamber needs high swirl at lower rpm, it helps disperse injector spray before the combustion starts. Otherwise, you get hot spots in chamber and areas of incomplete burning. During my time at Detroit Diesel we increased swirl with valve geometry, port shape and eyebrows on cylinder head as opposed to helical ports and swirl. Bigger engines have more room to play with stuff like that vs. these small diesels.” – Keith

"Swirl valves increase low rpm torque and efficiency by closing 1 intake runner which increases the intake air flow velocity into the cylinder, which creates more swirl in the chamber, to create a better combustion event. Removing the swirl valves will result in a small reduction in performance at lower rpms. I could tell the difference in my personal truck below 1400-1500 rpms with transmission tune it has, it will hold gears down below 1500rpms and after removing the swirl valves it was noticeably sluggish in that range. This can be alleviated with changing the tuning to keep rpms higher but may result in worse mpg, mine definitely did not improve but I don't recall a significant loss in mpg either. If I ever pull the intake manifold again I plan to reinstall functioning swirl valves." - Jonathan

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[RhinoJT]

For anyone that has one of the tunes, is it possible to say if I had my stock ECU, and the tuned ECU, if I ever had to go to the dealer or something else, I could just swap the stock non-tuned ECU back in, run it through some drive cycles. Then once I am done, swap the tuned ECU back in? Seems like it should be that easy, other than probably having to run each through drive cycles for monitors and such. Or am I way off base here?

 

[biodiesel]

For anyone that has one of the tunes, is it possible to say if I had my stock ECU, and the tuned ECU, if I ever had to go to the dealer or something else, I could just swap the stock non-tuned ECU back in, run it through some drive cycles.

It's very common for owners to switch back and forth between the tunes for dealer visits. I've been doing that for several years. Fortunately, I can swap tunes on my 2015 EcoDiesel with the handheld device rather than swapping ECUs.

 

[RhinoJT]

Yeah, I had heard you don’t want to swap ECUs a bunch due to sensor data it stores and key cycles. Once every two years hopefully shouldn’t be an issue.

 

[rharr]

Yeah, I had heard you don’t want to swap ECUs a bunch due to sensor data it stores and key cycles. Once every two years hopefully shouldn’t be an issue.

No one is looking that deep, swap as needed. Where you get in trouble is if you pull your exhaust and go full open or pull your DEF then install a stock ECU, it will light up like a xmas tree because it will see the missing parts.
Running a stock ECU requires the rest of the truck to also be stock.

 

[biodiesel]

I've seen a lot of people lose their tune over the years by not changing back to the stock tune when going to the dealer.

 

[Rusty PW]

Yes. Not only has it been verified, but customers could notice it. As a matter of fact, EOC stopped deleting the swirl valve function because it was known to be more of a detriment than a positive.

Here are a few quotes:


"Swirl valves increase low rpm torque and efficiency by closing 1 intake runner which increases the intake air flow velocity into the cylinder, which creates more swirl in the chamber, to create a better combustion event. Removing the swirl valves will result in a small reduction in performance at lower rpms. I could tell the difference in my personal truck below 1400-1500 rpms with transmission tune it has, it will hold gears down below 1500rpms and after removing the swirl valves it was noticeably sluggish in that range. This can be alleviated with changing the tuning to keep rpms higher but may result in worse mpg, mine definitely did not improve but I don't recall a significant loss in mpg either. If I ever pull the intake manifold again I plan to reinstall functioning swirl valves." - Jonathan

This sounds like how Honda V-Tec operates. My Honda VFR 800 motorcycle has one intake valve closed until 7,000 rpms, then the other intake valve opens. Sounds like a 4 bbl carb when it happens. And you get a nice rush of power.

 

[Tlicious556]

You will be losing power and fuel economy by deleting swirl valves. It's not recommended.

The GDE EPA Compliant Tune uses EGR.
The GDE Afterlife Tune disables EGR.

well i didn't realize that part, i thought it turned it off.

 

[biodiesel]

well i didn't realize that part, i thought it turned it off.

In order to be EPA compliant, all emissions systems need to work. GDE does a good job with tuning, so you will have a cleaner combustion which results with fewer regens, but the EGR is still in use.

 

[cmb396]

What would be the best tuning option for a jeep that takes a lot of short driving trips? We just purchased a diesel for our son that's still in hs, so no long sustained highway driving. Ten miles from home to school, to football practice, some running around, and home.
I had full intentions of doing a full delete, but after getting several very pricey quotes (3k and up), that has been put on delay.
Main goal is to cut down on regen and longevity.

 

[biodiesel]

What would be the best tuning option for a jeep that takes a lot of short driving trips?

The GDE Afterlife tune is the best for longevity. With that said, my 2015 Ram EcoDiesel is bone stock, and I've been driving to work and back for 11 years without any issues. I live 7.8 miles from work. Short commutes aren't as detrimental as some make it out to be.

 

[cmb396]

The GDE Afterlife tune is the best for longevity. With that said, my 2015 Ram EcoDiesel is bone stock, and I've been driving to work and back for 11 years without any issues. I live 7.8 miles from work. Short commutes aren't as detrimental as some make it out to be.

Perfect, thank you for the feedback!

 

[22EcoDs]

I have had both the gde epa and the gde afterlife. EPA compliant does use EGR but I can confirm it flips to downstream very quickly , reducing the sooted upstream circuit time, and only routing "filtered exhaust" into the system. Afterlife turns it off completely. I do notice a difference in dpf buildup between the two. Afterlife it never builds up, seems to peak around 11-15 and then only regens after 1000 miles. Regen also clears faster it seems. I average 23-25 mpg depending on how I drive , highway on 315/70 grabber atx. I just switched to Nitto g3's dropping ~7lb a tire so i'm hoping for a small improvement. I will say afterlife oil is staying significantly cleaner.

 

[Free2roam]

So if you go afterlife tune. Keep your stock ECM can you just switch back and forth when having to smog or go to the dealer?

 

[biodiesel]

I will say afterlife oil is staying significantly cleaner.

Turning off EGR makes a huge difference in engine cleanliness. My buddy just turned 614,000 miles yesterday on his 2015 Ram EcoDiesel (GDE tuned).

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