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Discussion Starter #1
Broke down and flashed the new 2018 tonight. Still waiting for my exhaust before it gets fully tuned and deleted. Just went over the stock tune and smoothed it over a bit got rid of the dead pedal and raised the torque limiters.

All I can say is wow what a difference, I honestly don't know why they don't tune them like this from the factory. Probably mileage concerns I suppose. Much nicer to drive now, actually feels peppy, needs a lot less throttle input when trying to accelerate.

I'm still babying this thing around but its a lot nicer to drive now.
 

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Awesome! I don’t have those computer skills, i had to purchase tuning but you’re right. Night and day difference.
 

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DuramaxTuner made a video when they first came out with tuning for this engine that "GM left a lot on the table" when it came to the power, torque, fuel economy and performance that these trucks are capable of.
 

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Lol,we do have diamondback rattlesnakes here! I just looked up the 2018 tuner and they offer one tune for about 1000 dollars!Too expensive imo!!!
 

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Lol,we do have diamondback rattlesnakes here! I just looked up the 2018 tuner and they offer one tune for about 1000 dollars!Too expensive imo!!!
Yea cost me about $1100 for the engine and trans tune with the handheld device and 4 pos switch
 

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They have been doing it for a while and they know what they're doing. And have great support and service. It is expensive but it's worth the money.
 

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They have a single tune that makes good power and torque (little less than DT I think) but:
1) They close off the egr, which makes your intake not get sooted up.
2) they disable the def system. No more adding def.

Both of these systems work together to remove NoX from emissions.

Regens still occur normally, that’s a different system and isn’t tied into these systems.

No egr is the main benefit. Have you ever noticed your truck has a lot more pep when its doing a regen? Well, that is because the EGR is closed and your truck is only getting cool fresh air in the intake. No sooted up intake has obvious benefits.

If you ever want to go back stock, The egr still does a open/close cycle with ign on so it won’t get stuck closed over time, but May Be sooted up pretty bad and need cleaning. the def in your tank will go bad over time and will need to be drained and replaced, not sure about the def pump and injector over time without use.
 

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I've been seeing info on their tunes. I get the EGR being turned off, but why turn off the DEF? Isn't that an important step to keep the exhaust filter from being ruined? If it still does regeneration, it doesn't need DEF? I guess I still don't completely understand the emissions system process.
 

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Their tune isn’t green at all if you read above.
Well, It's "green" by saving you money (greenbacks, cabbage, dough, bread, moolah, simoleons, etc...) on fuel, wear, maintenance and DEF.

I've been seeing info on their tunes. I get the EGR being turned off, but why turn off the DEF? Isn't that an important step to keep the exhaust filter from being ruined? If it still does regeneration, it doesn't need DEF? I guess I still don't completely understand the emissions system process.
DEF is SCR and exhaust filter is commonly called DPF. DPF has nothing to do with SCR other than they are part of the complete emissions system. They are two completely different technologies. There is really to much to explain here, google is your friend for more info.
 

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If you close the EGR and left the DEF active you would burn through so much DEF so quickly trying to get rid of nox (assuming your truck wouldn’t throw a tantrum) basically, You have to shut them down together. All they do is control nox together
 

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I'm heavily on the fence regarding tuning.
DPF:
There are two types of soot control, passive due to engine exhaust and active using injector ahead of DPF or cylinder injector firing on exhaust stroke,
The ash is then contained within the filter and stays there until fully loaded with ash at which point it must be replaced (small equipment like ours) or cleaned (heavy equipment and heavy trucks).
Worried that tuning will significantly reduce the life of the DPF. It WOULD be possible to remove, cut apart DPF and wash out, re-weld and re-install.
SCR:
DEF is injected upstream of SCR to reduce NOX. Unsure of benefit of shutting off DEF injection as there seems to be no benefit other than saving a very small amount of money.
Please chime in with additional knowledge guys.

A quick note to those of us in cold climates: NEVER completely fill your DEF tank in freezing weather as it expands when frozen and may split the tank.
Also, the heater can of course thaw out a smaller volume of DEF easier.
 

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Discussion Starter #20
A quick note to those of us in cold climates: NEVER completely fill your DEF tank in freezing weather as it expands when frozen and may split the tank.
Also, the heater can of course thaw out a smaller volume of DEF easier.
Maybe that's why the dealer only half filled my tank.
 
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