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Old 06-10-2015, 08:48 AM
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Hello all, I installed the ECU on 05/22 and I have filled up after going through the first tank of fuel. I will update after the second tank.

Edit 06/10: This is the hot tune.

First I will start with the bad as there is only one item to discuss. That’s the lack of an OBD flash tool to upload the tune. At this time the only option is to swap out the ECU. The swap is easy, consisting of three bolts holding in the ECU plus the wire harness connector. Now the upside. I noticed the engine and exhaust note are now deeper in sound. No louder, just more throaty. My unicorn now sounds like an angry sewing machine. With the extra power of the tune the engine stays in high gear more before needing to downshift. I had that awful TSB flash that both Raven and ExcursionDiesel complained about where the Jeep would downshift all the time on hills. That is gone with the tune. In slow speed traffic the Jeep isn’t in a race to upshift as fast as before which leads to a smoother drive creeping between close stops signs and traffic lights. The power increase is very noticeable. I tried to evaluate this whole tank of fuel for mileage but I couldn’t help myself and I’ve been getting on the throttle a bit. From a dead stop 60MPH comes up very fast. I would say the GDE claims of minus 2 seconds to 60MPH on the Ram also applies to the Jeep. I dropped the Jeep into Sport mode yesterday and from a 20 MPH roll the tires let out a little chirp when I nailed it. The Jeep is extremely fun to drive now. Overall I'm pleased with the tube for the increased mileage and power. Throw in the reduction of DPF regens, lower DEF dosing, and reduced EGR maybe the emissions will last now.

For the first tank I logged 576.8 miles and filled up with 20.72 gallons which returned 27.84 MPG. This is all city driving. I have had to change my daily drive into work due to road construction. I now drive 18 miles each way with 2 stops signs and 18 traffic lights and go through two school zones. Previously I drove 11 miles to work with 4 stop signs and 5 traffic lights and I averaged 24.5 – 25.5 MPH on those commutes. I think 28 MPH is in easy reach and maybe even 30 on my old commute resumes once Michigan’s second season (construction) ends.

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Old 06-10-2015, 01:02 PM
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Re: green diesel engineering tune

Nice report. Which GDE tune did you choose?
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Old 06-10-2015, 02:01 PM
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Quote:
Originally Posted by Roadkill View Post
Nice report. Which GDE tune did you choose?
It's the only tune they have right now which is the hot tune. I will edit my post and add that. Sorry I missed it.
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Old 06-10-2015, 06:48 PM
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Re: green diesel engineering tune

Thanks for the info! I was wondering if they have a free upgrade option that allows users to update the flash as new GDE tweaks come out - or if the dealer happens to flash it with a stock program while doing a TSB or similar.
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Old 06-10-2015, 06:55 PM
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Re: green diesel engineering tune

We finally have the WK2 engine tune released for production on our website at the link below:

http://www.greendieselengineering.co...+Tune+&model=+
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Old 06-10-2015, 07:17 PM
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Re: green diesel engineering tune

Quote:
Originally Posted by hayasa View Post
Thanks for the info! I was wondering if they have a free upgrade option that allows users to update the flash as new GDE tweaks come out - or if the dealer happens to flash it with a stock program while doing a TSB or similar.
If you lose the tune due to dealer reflash, we will setup a new clone for $100. Ideally, just tell the dealer you are happy the way the Jeep runs and do not want any service updates. You can also get a lockable cover for the OBD port for a service visit.

Thanks
GDE
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Old 06-11-2015, 12:11 AM
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Re: green diesel engineering tune

Did you get the engine braking option? Curious as to how that works, is it something that is on all the time or is there a set of criteria that must be met? Really want to get a tune for my Summit when I pick it up on the 22nd this month!
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Old 06-11-2015, 12:40 AM
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Originally Posted by farfromovin View Post
Did you get the engine braking option? Curious as to how that works
I'm interested as well, though I admit I question whether I would want it. I have never had another vehicle besides my EcoDiesel that required power from the accelerator in order to avoid slowing down while going *down* a parking ramp (I just shift to N now to avoid that).

It just seems incongruous to have to burn more fuel to get the vehicle to do what gravity wants anyway. If the engine braking is more of the same then that would be a definite donotwant.
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Old 06-11-2015, 07:23 AM
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Re: green diesel engineering tune

I'm interested in this as well. I think engine braking is most relevant to those of us who tow. Allowing the engine to slow the vehicle during coast helps preserve the brakes which is particularly important when going downhill and getting pushed by a trailer. Not sure if engine braking is as important to people who don't tow or live in the mountains. I read somewhere that unlike gas engines, which automatically provide some degree of engine braking when you back off the throttle, diesels provide almost none even when downshifting unless specially configured to do so. That's why our vehicles coast really well in stock tune. Check it out next time you drive. It takes a long time for the vehicle to stop without brakes.


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Old 06-11-2015, 07:27 AM
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Originally Posted by JEB1 View Post
That's why our vehicles coast really well in stock tune. Check it out next time you drive. It takes a long time for the vehicle to stop without brakes.
Uh, not my 4x4 EcoDiesel. This vehicle downshifts rapidly when the accelerator is released and if you want to get any coasting distance at all you need to shift into neutral. Otherwise, it loses speed so quickly you would be lucky to be able to coast to the stoplight at the end of the offramp if you release the accelerator at the moment you exit the highway.

Maybe I need to disable Eco mode or something in order to turn off the "sucks at coasting unless it's in neutral".
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Old 06-11-2015, 07:43 AM
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Re: green diesel engineering tune

My 4x4 coasts well in Eco mode. I was trying to reset one of the emissions monitors after my cat was replaced by allowing the vehicle to coast to a stop and had difficulty finding a stretch of road long enough.


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Old 06-11-2015, 08:18 AM
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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.
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