Green Diesel Tune Drivability

[StartedWith97TJ]

Even with an extended warranty at risk, I am still strongly considering the GDE tune. I am not concerned with 1/4 mile times/speeds at all. I am primarily interested in reducing the soot being pumped back into the engine, and protecting the fuel pump (since Jeep can’t seem to find a fix).

I have read about some harsh shifting, due to more locking if the torque converter. I know a few of you have a good chunk of miles on the GDE tune. What can you tell me about the overall drivability?

Thanks in advance!

Keep Jeep’n

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[TX_Ovrlnd]

https://www.jlwranglerforums.com/forum/threads/took-the-plunge-ordered-green-diesel-tune.89672/

 

[Ratbert]

What's the big concern about the fuel pump? It's an extremely rare failure that's covered by them.

I asked my dealership about it and they're claiming that a fix is due in August. We'll see.

 

[StartedWith97TJ]

@Ratbert - the fuel pump is not a big worry of mine (I simply add a little fuel treatment to ensure lubricity across fill ups). The worry is that if you mess with ECU, then Jeep may not do the fix (if/when one comes available). Also, GDE seems to believe their updates mappings actually reduce and/or eliminate CP4 failures. That is nice for those of that use our Jeeps daily and for long road trips.

I am really interested in the GDE tune use the second system for soot processing and greatly reducing the amount of soot pushed back into the engine. That seems like a great thing for long-term ownership.

 

[jav_eee]

@Ratbert Also, GDE seems to believe their updates mappings actually reduce and/or eliminate CP4 failures.

How do they do this? Does the tune somehow increase the lubricity of your fuel and/or ensure water separates completely at the bowl and auto dumps it for you?

 

[StartedWith97TJ]

@jav_eee —> From what I read, there are multiple fuel strategies employed by our JLs (3 I think). Using certain strategies under certain conditions will provide a higher risk of the fuel flow being interrupted, which is usually the trigger for misalignment and eventual failure. By eliminating the use of the strategy (or strategies) that is more likely to allow the misalignment to occur, you minimize the risk. I believe on their website they even mention that they have not had a fuel pump failure after a tune. They believe that is directly attributed to their choice of fuel strategies.

I have nothing to do with GDE, I have a couple engineer friends thar work on diesel engine products. They mentioned that the fuel strategy is something they know can cause CP4 issues, and that some tuners seem to be addressing the issue better than others. One mentioned they had heard good things about GDE. That got me looking on their site, where more info was available.

Hope that helps.

Keep Jeep’n

 

[Pistoloni]

I've had mine for the last 4k miles. Got it around 16k after hesitation. Wish I had done it sooner. Throttle response is improved, more power and slight highway mpg improvement.

Starting cold ( I let engine idle a few minutes) the shifts of 3/4/5 are all very quick, around 2300rpm. Those 3 shifts sound weird, to the ear, when driving. Not as noticeable after transmission is at temp.

Sitting in traffic and going from 0 - 10 - 0, usually has a quick stop in first gear before getting to second. Overall the GDE tune has higher rpms in general. One of the main reasons I wish I had got it done sooner was because I had become very used to the stock shift points and rpms.

I dont launch and have only gone on some very easy trails. I have been using hot shots for last 3k miles and hope between the 2 it helps the cp4 pump

 

[StartedWith97TJ]

@Pistoloni - Thanks for the thoughtful feedback. That is exactly what I am looking for. I have read a little about the odd transmission shifting when cold, but I am not sure I fully understand it. Does the odd noice/feel occur after the tranny warms up? Does occur under both heavy and light loads? I am all for crisp shifting, but I am not sure why that would sound different. What all have you noticed?

 

[Motion427]

I also did the GDE. Works very well.When the Jeep is at a colder engine temperature, the transmission settings are different. Also the torque converter locks up earlier which is more noticeable between the gears,but the converter pretty much needs to be locked on a diesel so that max torque can get to the wheels,if the converter is unlocked under power it creates slippage and heat ,eventually it will fail.

1.4 seconds faster 0-60 and over a second faster in the quarter mile. I have to launch it in 4wd so that it doesn't light the rear tires. I don't race the Jeep. I only tried it a couple of times to get the data and that's it. If I want to go fast, I have another vehicle for that.

And yes, tuning does help the fuel pump.

Use a camshaft and lifters as an example. The factory tune reduce the preload on the lifters and sometimes they actually lift off the cam which create float and smacks the cam lobe and eventually cause a failure. The new tuning does not reduce the pressure of the lifter and it stays on the cam like it should. The pump is quieter now at low throttle because of that tuning update.

I have 2 PCM's for my Jeep. One is bone stock and the other one has the GDE tune in it. I also add some additives in the fuel. The main reason that I run the GDE is the reduce soot and the fuel pump tuning updates. Customer service was great.Theirs other options out there and the other one I checked ,the customer service wasn't to my liking. I also do tuning at our shop,but it's for gas applications. So GDE answered my questions with ease compare to the other.

 

[Pistoloni]

@Pistoloni - Thanks for the thoughtful feedback. That is exactly what I am looking for. I have read a little about the odd transmission shifting when cold, but I am not sure I fully understand it. Does the odd noice/feel occur after the tranny warms up? Does occur under both heavy and light loads? I am all for crisp shifting, but I am not sure why that would sound different. What all have you noticed?

I meant to take a video this morning of it shifting, but once it shifts from 2 into 3 its over 2000rpm, around 2100? and shifting from 3 - 4 & 4-5 it goes 2100 - 2300 for each change. Once in 5th, it shifts into 6th when I get to about 39mph didnt make note of rpms. Once in 6th, it drops to 1300?rpm

So 3-5 are all above 2000rpm and shift quickly. Which is much different than the stock shifts. The sounding weird part I mentioned is what, imo, sounds like someone not used to driving a manual. In a gear longer with higher rpm.


I am far from anyone who can really speak anything technical regarding the tune. I do like it, and wanted it for the added power plus the help with the fuel pump I read about which I think was a repost from the Gladiator forum.

I opted for the regen message and have noticed its been about 1k miles that I get the message and another 15-18 to clear.

 

[Deleted User 38384]

What's the big concern about the fuel pump? It's an extremely rare failure that's covered by them.

I asked my dealership about it and they're claiming that a fix is due in August. We'll see.

11 years in the making... I'll believe it when I see it!

 

[ChuckQue]

Seems like there’s some differences between the GDE and EOC choices. Both have extremely good reviews, but both offer different options. The GDE gives you the option for engine braking, but isn’t supported behind enemy lines making for a much more difficult process for updates or obtaining the tune itself. EOC doesn’t offer engine braking that I can see, but does give the option to turn the EGR on or off AND DEF on or off. It’s also readily supported behind enemy lines…

 

[Ratbert]

11 years in the making... I'll believe it when I see it!

Yeah, I thought that it was pretty weird that she explicitly said August 17th.

 

[rickinAZ]

I asked my dealership about it and they're claiming that a fix is due in August. We'll see.

I stopped by my dealership yesterday with my FIVE fuel pump recall notices in hand. They are still being kept in the dark as well, and they are stuck in the middle.

Ratbert, I agree, The low failure rate is the silver lining.

 

[danald01]

Who is EOC?

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