How to keep your LML Duramax reliable?
The LML Duramax doesn’t have a factory lift pump. Luckily, the addition of an aftermarket electric lift pump can help ensure that positive pressure (and no air) is supplied to the low-pressure side of the CP4.2—and can be installed relatively affordably.
How to modify the LML Duramax?
jc1843. The only tool you should need is a 1/2 inch breaker bar to loosen the spring loaded belt tensioner. Then the belt comes right off. Be sure to note how it is run around the pulleys- before you remove it. -- BUT some of the later trucks have a problems because the close fit of the fan shroud.
What is the MPG of a Duramax?
Popular Options
- Tuning your engine to increase the torque rise
- Lowering your truck
- Getting an EGR delete
- Removing the tailgate
- Getting a bed cover
- Going easy on the AC
How much horsepower does a Duramax diesel make stock?
Today, the Duramax makes nearly 400 horsepower and over 750 lb-ft of torque while reducing emissions considerably over previous generations. The chart below follows the progression of the Duramax diesel, from the first LB7 to the more recent LML. The LBZ was introduced in 2006 and eventually replaced the LLY by 2007.
How much HP does a LML Duramax have?
397 hpThe LML Duramax left the factory packing 397 hp and 765 lb-ft of torque—but the new, more powerful horsepower and torque numbers weren't the only changes made for the 2011 model year… This version of GM's 6.6L common-rail diesel V8 deviates from all others in terms of its injection system.
How much horsepower does a 2011 LML Duramax have?
397 HorsepowerGM Specs New 2011 LML-Series Duramax Diesel at 397 Horsepower and 765 Pound-Feet of Torque.
How much HP can a LML transmission handle?
Registered. The LMM can handle about 130 RWHP tune on the stock transmission.
What size is stock LML Turbo?
SIZE 6TURBO FEATURES STOCK SIZE 6 BLADE COMPRESSOR WHEEL, 10 BLADE TURBINE ALL NEW SEALS, HEAVY DUTY BEARINGS, 360 THRUST BEARING GREAT REPLACEMENT FOR YOUR STOCK/ DAILY DRIVER.
Is LMM or LML better?
LML is arguably a better engine but there are issues with DEF on all makes; Ford, Ram and GM. LMM emission controls have proved to be as reliable as any.
Are LML Duramax a good engine?
Outside of the injection pump, the LML is a reliable engine with the exception of the emissions systems. DEF and SCR cause their fair share of problems, but are also covered under warranty for the trucks that still have it. The problems are common enough that deleting the DEF system is frequent among LML owners.
What should I do to my LML Duramax?
1:297:19LML Duramax *5 Modifications You MUST Do!* - YouTubeYouTubeStart of suggested clipEnd of suggested clipYou need to do a cp3 conversion on this truck. Without a doubt cp3 conversion to get rid of thatMoreYou need to do a cp3 conversion on this truck. Without a doubt cp3 conversion to get rid of that junk cp4 that blows up obviously all you guys know that the cb4s are just the worst pumps.
How much HP can a stock Allison 1000 handle?
As you've probably deduced up to this point, the stock Allison will handle roughly 350 to 400-rwhp in five-speed form and 425 to 450-rwhp in six-speed trim. However, if you push things past that point the clutches will eventually slip and bring on the Allison's notorious “limp mode” condition (i.e. limp home mode).
How much HP can an Allison 3000 handle?
450 hpAllison Transmission's 3000 Series is designed for medium-duty commercial vehicles and is engineered to adapt and operate efficiently in a variety of applications. The 3000 Series includes close or wide ratio gearing and a maximum rating of 336 kW (450 hp).
How many miles will a Duramax LML last?
If you want to know how long a Duramax engine will run, you should expect it to last as much as 300,000 miles before needing any major repairs.
What turbo is in a LML Duramax?
The 63mm FMW Duramax VNT Cheetah Turbocharger is a drop-in replacement turbocharger for 2011-2016 Duramax diesels. It comes with a Fleece Performance Engineered 63mm FMW compressor wheel and high flow Cheetah turbine wheel.
What turbo does the LML have?
6.6L Duramax LMLCompressor6.6L Duramax UpgradeTurbo PNInducer6.6L Duramax LML (2011 – 2016)886976-5004S65mm
When did the Duramax 6.6L V8 come out?
The Duramax 6.6L V8 turbo-diesel engine is nearing its 20th year of production, after debuting in 2001. Over the engine’s lifespan it has gone through 6 different engine variations: LB7, LLY, LBZ, LMM, LML, and L5P.
Which Duramax has the largest turbo?
With the Garrett GT3788VA, the LLY Duramax has the largest turbocharger in it out of any other 6.6L Duramax variation. Given the larger turbo and various other small engine improvements, the LLY has the biggest horsepower gains from a tune only compared to any other variation, with the exception of the L5P Duramax.
What is the LBZ engine?
For most folks, the LBZ is a dream of an engine and will do whatever you’d like it do while maintaining its reliability. However, for those diesel power enthusiasts looking to push engines to massive horsepower numbers, the LBZ has its crux. The pistons on this engine are known to crack above the 600rwhp mark.
What is a LB7?
The LB7 is the original production 6.6L Duramax V8. Following success with the performance and reliability of the LB7, this engine became the building block of the Duramax line all the way up until today.
What is the last engine model to not have all the problematic new emissions features with it?
Additionally, the LBZ was the last engine model (RPO) to not have all the problematic new emissions features with it (with the exception of an EGR). The LBZ’s lack of emissions-controlling technology is actually the sole reason for its short lifespan.
Is the Duramax 6.6 a V8?
With the horsepower and torque of the Duramax nearly doubling from 2001 to 2020, this is certainly true for this 6.6L V8 engine.
Is the LMM the same as the LBZ?
The LMM is virtually the same engine as the LBZ with more emissions control. The LMM features a diesel particulate filter (DPF), an oxidation catalyst, and a more savvy EGR. DPF’s essentially capture and hold any leftover diesel particulate, preventing it from being released into the atmosphere.
Does the GM CP4.2 have an electric lift pump?
Unlike with the CP3-equipped engines built prior to the LML, the CP 4.2 doesn’t tolerate a lack of fuel pressure and especially air very well—but the chances ...
Does the CP4.2 have an aftermarket lift pump?
Because the CP4.2 doesn’t tolerate air or fuel inconsistencies nearly as well as the CP3 did, an aftermarket lift pump should be one of the first upgrades performed on any LML Duramax.
What engine is used in a 2011 GM diesel?
Your 2011 - 2016 GM Diesel is powered by the LML Duramax. This engine is capable on monstrous amounts of power while retaining some reliability, if you know what you are doing.
Why do I need a bigger turbo?
It's limited capacity to efficiently move air at high RPM's comes from the overall size of the turbo. Simply put, you need a bigger turbo to make more power. However, you don't want to make your truck un-driveable from excessive turbo lag.
Does the Duramax DT750 cut corners?
You need something reliable for your build. The DT750 is a fully built transmission that is generally on the shelf and ready to ship. The DT750 doesn't cut any corners.
When was the 6.6L Lly Duramax made?
6.6L LLY Duramax. The LLY Duramax was produced from 2004 to 2006, before it was eventually replaced by the LBZ Duramax. It was a stepping stone for GM as they begun to encounter stricter emissions requirements thanks to the federal government and California.
What is the 2nd generation Duramax?
The 2nd generation Duramax is known as the LLY. Similar to the LB7, the LLY Duramax is reliable, powerful, and lacks most of the emissions found on modern day diesel trucks like the L5P. LLY Duramax trucks don’t suffer from the same injector failure problems that LB7 trucks frequently had. Instead, many LLY Duramax problems stem from overheating.
Does the Lly Duramax have a turbocharger?
Although our LLY Duramax specifications chart above does mention the turbocharger found on these trucks, it doesn’t mention the fact that these are one of the largest turbochargers found on any Duramax today.
What is the weakest link in the Duramax LB7?
The weakest link in the LB7 Duramax’s rotating assembly is its connecting rods. Like all Duramax engines, the rods are made from forged steel and feature a cracked cap design. However, less material exists in the bottom of the beam area when compared to ‘06-‘10 engines. The lack of meat in this critical area helps explain why the rods are prone to bending at lower horsepower and torque levels, as well as why LB7 rods weigh less than the units you’ll find in LBZ and LMM models (1,155 grams vs. 1,173 grams).
What is the strongest connecting rod for a Duramax?
Without a doubt, the most popular aftermarket connecting rod for the Duramax is the forged-steel H-beam from Carrillo. At 1,090 grams apiece, they’re lighter than any factory Duramax rod, and are said to be the strongest, hence the frequency with which they’re used in engine builds and their high availability.
Is torque a weak link?
Because torque ( i.e. cylinder pressure) is the primary killer of rods and pistons, it’s difficult to directly link a horsepower number to each engine’s weak link. However, as a general rule of thumb, a common consensus exists for the horsepower thresholds listed here (and the torque that goes along with those numbers).
Is the LLY Duramax the same as the LB7?
With the LLY Duramax sharing the same connecting rod as the LB7, it’s no surprise that this component is also the weakest link in the second generation of the Duramax. And, like the LB7, compression once again checks in at 17.5:1, meaning higher peak cylinder pressure (i.e. torque) beating down on it. But the LLY introduces one more ingredient to the weak connecting rod recipe.
Duramax LML Power Limits
Modding the Duramax LML has a few hurdles or restrictions that are important to mention. Before I discuss some of the weak points, keep in mind these are hurdles all diesel engines face, not just the 6.6L Duramax or the LML. The LML remains just as mod-able as both the Powerstroke and Cummins. Here are our spark notes on the below items:
Best Duramax LML Performance Mods
The best bang-for-the-buck mod, and best mod in general, on our list is a tuner. However, we put a cold air intake first on our list because it’s highly complimentary with a tune.
6.6L Duramax LML Performance Upgrades Summary
With 765lb-ft. of torque, I’m not sure you really need much more power. However, if you do a simple cold air intake and tuner can give you a 500whp LML. The downside to the LML is that modifying it beyond 500whp gets very expensive and requires significantly more modifications.