Diesel Tuner's Blog

2011 - 2016 LML Duramax 520 RWHP Tune Only!

Posted by Paul Wilson on Feb 4, 2019 8:59:00 AM


The 2011 - 2016 LML Duramax came rated at 395 horsepower and 765 ft/lbs of torque.  That seemed like an amazing amount of power when this model was first released but these days it is dwarfed by the available power of brand new trucks.


Furthermore, that whopping 395 HP is a peak power rating, meaning that you probably won't produce that much power during normal operations.  In fact, many owners complain that the power delivery of the stock tune is too soft. This is why custom tuning is so important for the LML Duramax.  

Here are some of the things tuning your LML can help with:

  • Increased Peak Horse Power
  • Improved Shift Quality
  • LML Dead Pedal Resolution

LML EZ Lynk Tuning

What does TUNE ONLY mean:

The term TUNE ONLY is our way of indicating that the horsepower rating does NOT require the removal of emissions equipment.   For some trucks, we do still have a few supporting modifications installed to reach the published power ratings. An example of this would be the lift pump we install on the 2011-2016 LML Duramax,  

520 RWHP / 1,019 ft-lbs526 Race Tune

LML Race Tune Dyno Graph (DPF ON)

LML Tuning with EZ Lynk

EZ Lynk is the most user-friendly tuning hardware we have ever used to provide truly custom tunes.  In just a few minutes you can walk through the easy to follow 3 simple steps to load custom tunes on your 2011 - 2016 LML Duramax.

(5) Switch-on-the-fly Tunes & TCM Tuning Included:

1. Optimized Stock

2. Heavy Tow Tune (435 RWHP)

3. Light Tow Tune (450 RWHP)

4. Sport Econ (505 RWHP)

5. Race Tune (520 RWHP)

Other Suggested Supporting Modifications:
  • Lift Pump
  • Sump
  • S&B Intake

If you are looking to package these options together, check out the LML Stealth Series Bundle: Stage 1.  

LML Stealth Bundle: Stage 1



1. How often does the truck go into regen?

Our experience has been that there are 2 common triggers for regen. The truck will initiate regen once it reaches 44 grams of soot in the trap or travels ~700 miles since the end of the last regen. Whichever of these events occur first will start a regen. The regen seems to last until the soot load goes below ~10 grams or so and the driving conditions no long promote regen.

2. How long does it take to regen?

Our test trucks average about 1 mile per gram of soot. So if the DPF is at 44 grams, and regens down to 5, it generally takes about 40 miles. Of course, it'll take longer if the cycle is interrupted.


3. How quickly does soot accumulate? 

It depends on usage. On the highway, it may be 1 gram every 25-30 miles. Mixed driving might be closer to 20 miles, and of course on the dyno things move a little faster. The weird thing is that the counter jumps quickly between 1-10 grams (maybe one gram per mile), counts slower from 10-19 grams (10 miles/gram), and then seems to count from 20-up much slower (20-30 miles/gram).

4. How much extra fuel does regen take?

My best guess comes from the mileage adjustment I see under steady-state operation. For instance. My trip this weekend averaged 19.7 MPG mixed over 700 miles. The truck entered regen at 700 and regen-ed for 40 miles. At the end of regen, the DIC showed 19.2 MPG. If I'd done the 740-mile trip without regen at 19.7 MPG I would have used 37.56 gallons. At 19.2 MPG, I used 38.54 gallons - a difference of about a gallon or 2.6% more fuel.

5. Does tuning affect regen frequency?

Of course, it does. The tune needs to be clean for the regen frequency to be kept in check. Our tunes are as clean or cleaner than stock. This 515HP tune has managed 700 miles between regens during road tests. Even driving the truck aggressively seems to have very little effect on the soot counter. The early tunes I tested on dyno seemed to load the soot trap very quickly on the higher HP settings (Superchips/HS/Hypertech). If driven reasonably, the intervals weren't noticeably longer - but if hot-rodded you could expect the soot counter to move quickly.


6. What kind of Mileage can I expect?  

Mixed driving can mean many different things to different people.  With that said, a single wheel truck can generally manage 16-18 MPG mixed on stock tires with a reasonable driver.  On the highway, MPG numbers as high as 23 MPG can be achieved at cruising speeds near 60MPH. As speed increases past 70 MPH, mileage closer to 20/21 is the norm.  Colder temps will hurt mileage, especially if the truck is short-tripped.


If you have more questions about LML Duramax Performance give us a call at 815-568-7920 or click the link below.



Topics: LML, LML Tuning, LML Power, LML Performance, 600HP LML