GDE Tune questions? Around town and rolling to a stop?

GDE Tune questions? Around town and rolling to a stop?

This is a discussion on GDE Tune questions? Around town and rolling to a stop? within the RAM 1500 Diesel Tuning forums, part of the RAM 1500 Diesel Garage - RAM 1500 Diesel Mechanics Corner category; I have a 2015 ED Limited, stock with the AEM update done 2 months ago. My MPG has dropped a couple points, and I have ...

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Thread: GDE Tune questions? Around town and rolling to a stop?

  1. #1
    RAM Jr Member Machria's Avatar
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    GDE Tune questions? Around town and rolling to a stop?

    I have a 2015 ED Limited, stock with the AEM update done 2 months ago. My MPG has dropped a couple points, and I have that “lag” being discussed, so I’m thinking about doing the GDE, but know very little about it.

    A couple of specific questions:
    1. I drive mostly around town with the truck, about 90% of the time less than 30 miles a run, and probably 50% of the time 5 to 10 mile runs. I understand the performance upgrades the GDE will give me (better power/pickup...), BUT, is there engine longevity improvements made when used “around town” vs highway type mileage? In other words, is the GDE tune made more for highway type driving, or is it made for everything for the most part? Aka, other than the performance gain I will “feel”, will it be good for my engine since it’s driven mostly around town or is it instead better for an engine driven on highways...?

    2. Will the GDE tune improve the around town MPG, or again is it based more on a highway MPG improvement?

    3. Something that has bothered me on this truck which was not affected by the AEM update I don’t think, is the fact when I roll up to a light for example (going 20 mph and take my foot off pedal early to roll up to a red light ahead), the truck often feels like I put my foot lightly on the brake. In other words, it doesn’t seem to free roll very well, it’s almost like I have always left the parking brake lightly engaged or something. Something goes on with the tranny when you let it idle and roll going 10 or 20mph... So does the GDE tune affect this? And/or does the GDE tranny tune affect/fix this?

    4. Lastly, if this “tune” works so well, why doesn’t FCA use it, or make their own similar.... ? What am I missing? Does it raise the emissions so the truck no longer meets the EPA standards or something? (And PS- if so, I could care less! just trying to understand...).

    5. Does it affect the warranty? I have the FCA MAX Care 10 year warranty + about to get the extra AEM warranty, I would hate to loose all that since I will likely not go over the mileage.

    Thanks in advance!!!
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  2. #2
    Administrator 97hmcs's Avatar
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    1. It works great for both city & highway driving.

    2. Yes.

    3. It will coast better with just the engine tune.

    4. FCA must adhere to strict EPA standards.

    5. That's a tricky question because technically it could, but we have never seen this happen.
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    RAM Sr Member RAM DRVR's Avatar
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    I am considering GDE tune also. Wanting to learn more.

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  5. #4
    RAM Jr Member cds13ca's Avatar
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    In response to #1, I'm like you, I do a lot of city driving, my mpg even in the city has been amazing with GDE, much better than stock. I also do some highway driving, but a majority has been city. My regen frequency is down SIGNIFICANTLY from stock (it used to be every 120-200 km between regens with stock). Now it's every 1100 - 1200 km between regens with GDE. It's a much cleaner tune city or highway.

    #2 - YES, see my answer to #1, in Canada, when I drove city a lot, I was getting around 10-11 L/100 km (21-23 mpg). Now I'm averaging around 8 - 9 L / 100 km with mostly city driving (26-28 mpg). Recently, I've done a lot more highway driving, and my avg is up in the 30 mpg range.

    #3 - I'm not sure what you mean - is it downshifting? When is the last time you lifted up the truck - I'd put it on a hoist, turn the tires by hand, is there resistance? It could be brake pads / rusty roters creating that braking feeling. You should be able to turn the tire freely when up on a hoist, if you feel resistance, you should pull the brakes, and clean them, put some lube on the brake sliders so they free up.

    #4 - they shut off egr which is why it's called "off road", not legal.. you have to weigh the pros / cons. On these trucks, running the egr is basically self destruction to the motor to save the environment. So at your cost, $50-80,000, egr is basically turning your truck into a fart breathing machine which eventually kills the motor with soot. Not a well thought out design. I believe, but I'm not sure, that GDE raises NOx emissions a bit, outside the allowable numbers?? I'm not sure. Regardless, the tune is smokeless, no black smoke, no white smoke, no black shit on my bumper and I could touch my exhaust tip and it's clean as chrome. It's a chance we take...

    #5 - what some do is they buy a 2nd ECU, get that tuned and keep the stock one for warranty work, an expensive insurance, but that's your decision.

  6. #5
    Super Moderator Mopar73340's Avatar
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    Just keep this in mind as the most important part of the tune, it shuts off the EGR and as mentioned is a long term engine killer due to soot ingestion.

    The tune is not for performance it is for longevity of the engine and therefore power wise you may or may not notice much of a power difference. You should definitely see a fuel mileage improvement but how much is dependent upon how you drive, and the “lag” should be non existent.

    The tune also leaves all the emission components intact and according to GDE, emissions of CO2 and soot are less than the factory tune. Regen frequency is vastly reduced as less soot is produced therefore less fuel wasted. NOX emissions are increased from the factory tune so therefore it won’t pass EPA or CARB standards.

    There is an entire GDE section here so spend some time there reading and all of your questions should be answered.
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    RAM Sr Member GRIFF4's Avatar
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    I gained a few mpg and the regen frequency is way better. It shuts the egr off worth that alone. The lag I had is pretty much gone. The turbo brake is extra but we'll worth it. There is always a risk for warranty issues but in my opinion pretty small and well worth the risk. I kept my stock ecu just in case but if I did it again I wouldn't. I don't think they'll find the tune and if they overwrite it just pay 50$ ship it back and GDE will retune it. The truck is all around better with the tune. If you want reliable and safe. It's not a oh my god this thing is a hot rod now tune.
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    RAM Jr Member Machria's Avatar
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    Quote Originally Posted by cds13ca View Post

    #3 - I'm not sure what you mean - is it downshifting? When is the last time you lifted up the truck - I'd put it on a hoist, turn the tires by hand, is there resistance? It could be brake pads / rusty roters creating that braking feeling. You should be able to turn the tire freely when up on a hoist, if you feel resistance, you should pull the brakes, and clean them, put some lube on the brake sliders so they free up.
    Not a brake problem, just “feels” like it. It feels to me like instead of coasting and putting the tranny in N, it downshifts and starts slowing the truck down like the “brake tune” would do (or downshifting on a manual car to brake....). But all I did was take my foot of the panel, and just want to coast up to the light (hoping it turns green before I have to stop and I can then accelerate..). I’ve never had a vehicle do this like this, all my other trucks and cars would coast much better, like they went into neutral when you took your foot off the pedal. I only notice this at slow speeds, below 20, 10 mph... not on the highway. It definitely a tranny thing.

    As far as the “regeneration” stuff everyone is mentioning. I bought my truck pre-owned from the dealer with 20k miles on it. I now have 50k on it, so I have put 25k on it, I have seen the “Re-generation” message twice. Once I was on the highway when it popped up, and it was done before I reached the exit I was going to so it was nothing really. The 2nd time I was on side streets just running up the road, so I got on a hwy way and drove 1 exit (5 miles I think) and it was done. So in 3 years, I spent 5 minutes on it?? I don’t quite understand all the hoopla over it? Is my experience not typical with the re-gen stuff?
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  9. #8
    RAM Sr Member GRIFF4's Avatar
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    Your truck is regening all the time you just don't know it. With some trucks like mine it was every 50 miles at the end 200 miles when I first bought it. Without a monitor it's hard to tell when it's doing it unless you know what your looking for. Some guys stock can go much longer then mine did stock. With a tune I get around 600 + miles. Excessive regens are hard on dpf filter and bad for fuel economy. It also can delute your oil with diesel fuel. You only seen it a few times when your filter becomes 80% full as a warning to drive on highway to clean it out.
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  10. #9
    RAM Jr Member cds13ca's Avatar
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    Well said GRIFF4! A lot of drivers don't realize how often these trucks REGEN behind the scenes. 7

    I didn't know either until I got a monitor and I kinda freaked out when I realized that my truck was doing a regen, like you, ever 120 km - 150 km which was nearly every 2 days! And with a lot of city driving, I had no clue that it was trying to regen and trying again and again cause I wasn't driving enough to complete..

    Now that I have a OBDII scanner and TORQUE PRO and GDE, I can see what's going on, and it takes me nearly 3 weeks of driving (1100-1200 km) before I get a regen, but I'm able to see when it's in regen, and hop on the highway to keep everything warm enough to complete the cycle...

    Excessive regen isn't good on the DPF or your oil - could lead to fuel dilution...
    97hmcs, GRIFF4 and lbengston like this.

  11. #10
    RAM Veteran lbengston's Avatar
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    Quote Originally Posted by cds13ca View Post
    #5 - what some do is they buy a 2nd ECU, get that tuned and keep the stock one for warranty work, an expensive insurance, but that's your decision.
    Well, what they really do is just order a hot tune from GDE, receive the tuned ECM, and keep their original one instead of sending it to GDE. So they pay full price instead of getting credit for trading in the stock unit.

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