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  #13  
Old 06-11-2015, 08:28 AM
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Re: green diesel engineering tune

My previous WK CRD had significant slowing during coasting and I assumed it was a mix of stock tune and the DPF getting close to clogged - which I assume was creating back pressure which the engine could not expel the exhaust as well when coasting and using no fuel. After I did a DPF delete and the GDE tune on it and it coasted like a boss after that.

For WK2 owners - put it in sport mode is what I do when I tow so it holds gears longer and you get better gearing when doing down hills so you don't have to use the brakes as much. I use sport mode when driving locally as we have some big mountains and it helps going down hill so I don't wind up dragging the brake for a long distance (cops hide out at bottom of the hills unfortunately here in NJ).

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  #14  
Old 06-11-2015, 09:49 AM
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Re: green diesel engineering tune

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Originally Posted by mazster43 View Post
I've never had any excessive engine breaking in either the stock tune or the GDE tune. I have a couple steep hills I drive daily and I let of the throttle before I start the descent and I have to hit the brakes well before the bottom as I'm increasing speed and running up on the people in front of me. I run Eco mode all the time.
Your tune does not have the engine braking enabled. We added this feature with the production release as we wanted to make a trip to Colorado to validate it.
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Old 06-11-2015, 11:56 AM
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Re: green diesel engineering tune

Can you comment a little on what you are changing to provide engine braking, I know on bigger trucks there is a specific component to increase exhaust pressure for braking.

Are you adjusting the variable vanes in the turbo or something else to provide the exhaust pressure?

Also, how does the transmission handle this since it is not changed?
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  #16  
Old 06-11-2015, 12:12 PM
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Re: green diesel engineering tune

From GDE with regards to the engine braking option:

"It will only be active in gears 3-6 and rpm 2300-4000 at zero throttle. In this manner it is not active in normal driving and typically only going down hills."
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  #17  
Old 06-11-2015, 12:53 PM
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Re: green diesel engineering tune

I need to correct myself on the engine braking feature.

It is active in gears 1-6 with zero fuel when the rpm is above 2750 at sea level. At altitude 5000 feet and above, it is active above 2500 rpm at zero fuel in gears 1-6.

Most folks will downshift out of gears 7 and 8 on hills due to runaway issues. In cruise control, the transmission automatically downshifts descending hills if you are exceeding the set point speed. Once you downshift and get above the rpm threshold, the engine braking will be active.

Engine braking is accomplished by closing the turbo vanes to just below the backpressure limit to prevent turbo over speeding. There are no effects on the transmission itself, it would be the same as using your brakes.
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Old 06-11-2015, 03:40 PM
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Quote:
Originally Posted by jaje View Post
My previous WK CRD had significant slowing during coasting and I assumed it was a mix of stock tune and the DPF getting close to clogged - which I assume was creating back pressure which the engine could not expel the exhaust as well when coasting and using no fuel. After I did a DPF delete and the GDE tune on it and it coasted like a boss after that.
Hm, that's interesting and plausible. However, my EcoDiesel still sucks at coasting while in gear even when the DPF soot level reads ~10% immediately post-regen (i.e. a normal post-burnoff value).

Are there any plans for a future GDE tune for the EcoDiesel that would support DPF/SCR delete?
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  #19  
Old 06-11-2015, 03:58 PM
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Re: green diesel engineering tune

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Originally Posted by Roadkill View Post
Hm, that's interesting and plausible. However, my EcoDiesel still sucks at coasting while in gear even when the DPF soot level reads ~10% immediately post-regen (i.e. a normal post-burnoff value).

Are there any plans for a future GDE tune for the EcoDiesel that would support DPF/SCR delete?
Based on our testing, there is not a real need for dpf or scr delete. The tune we have reduces regen intervals substantially. Maybe as the vehicles age it might become a selling feature. Rather than spend $3000 to replace a dpf, remove it at that time.

Removing that hardware does nothing for performance as the turbo then becomes mismatched to the backpressure. Ideally you would want a different A/R ratio on the turbo if there is no downstream pressure drop.
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Old 06-11-2015, 04:37 PM
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Quote:
Originally Posted by GreenDiesel View Post
Based on our testing, there is not a real need for dpf or scr delete.
It makes sense that the EcoDiesel system is designed to expect the inclusion of the performance- & economy-robbing DPF backpressure. Bummer.

However, simply deleting SCR *operational aspect* like you have deleted EGR would seem to be a valuable addition, if only due to reduced headaches. No more "200 miles until no restart" crap thanks to clogged/snapped injectors, no irritation from cacked SCR catalysts, no more paying attention to DEF manufacture dates and crystalline contamination, etc. Would it be possible to simply disable the SCR/DEF injection and monitoring via firmware, thus virtually leaving us with a "DPF but no SCR" EcoDiesel equivalent to what our friends in Australia have?
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  #21  
Old 06-11-2015, 05:07 PM
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Re: green diesel engineering tune

Quote:
Originally Posted by Roadkill View Post
It makes sense that the EcoDiesel system is designed to expect the inclusion of the performance- & economy-robbing DPF backpressure. Bummer.

However, simply deleting SCR *operational aspect* like you have deleted EGR would seem to be a valuable addition, if only due to reduced headaches. No more "200 miles until no restart" crap thanks to clogged/snapped injectors, no irritation from cacked SCR catalysts, no more paying attention to DEF manufacture dates and crystalline contamination, etc. Would it be possible to simply disable the SCR/DEF injection and monitoring via firmware, thus virtually leaving us with a "DPF but no SCR" EcoDiesel equivalent to what our friends in Australia have?
The big issue is that if you shut off the SCR system and leave it sitting, the tank inside will crystallize and create a giant mess and if it sits long enough then it could not function anymore in the future if you ever have to put back the stock ECU or otherwise make it work. In reality you would have to drain the tank and remove it from the vehicle, leaving a little bit of water inside to keep the filter saturated in case you'll ever have to use it again.

All of the major SCR system issues - catalyst efficiency faults, SCR cat replacement, etc - are no longer an issue due to different control strategies now. The SCR inducement is no longer a no-start situation despite what the cluster will say. Based on all our testing the DEF usage will more than hit the 10k service interval, we keep it dosing just that amount so that it doesn't go bad and the system keeps up appearances.
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  #22  
Old 06-11-2015, 07:35 PM
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Re: green diesel engineering tune

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Originally Posted by GreenDiesel View Post
The SCR inducement is no longer a no-start situation despite what the cluster will say.
So is that due to your tune, or is this the case with stock tunes? And thank you for your service in making these vehicles even better!
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Old 06-11-2015, 07:56 PM
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Re: green diesel engineering tune

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Originally Posted by hayasa View Post
So is that due to your tune, or is this the case with stock tunes? And thank you for your service in making these vehicles even better!
This is another feature only in our tune. Who wants to be stranded on the road in the middle of nowhere if they run our of def? I think that is a safety issue, so we turned it off. The vehicle will restart, but run in a reduced power mode until you dump in a bottle of def.
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  #24  
Old 06-11-2015, 08:13 PM
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Re: green diesel engineering tune

Quote:
Originally Posted by GreenDiesel View Post
This is another feature only in our tune. Who wants to be stranded on the road in the middle of nowhere if they run our of def? I think that is a safety issue, so we turned it off. The vehicle will restart, but run in a reduced power mode until you dump in a bottle of def.
Holy crap - that alone is worth the price of the GDE tune! Now just get the handheld flash unit up and running and I'll really be impressed!
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