Mechanically, the LBZ used the same Duramax parts as the LLY. However, the LBZ generated 360 horsepower over the LLY’s 310 horsepower. Torque increased as well, going from 605 pound-feet with the LLY to 650 with the LBZ.
The Duramax engine has evolved from the original LB7 series to include the LLY, LBZ, LMM, LML/LGH, and now the L5P series. The simplest way to verify which series Duramax you have is interpreting the VIN# of the truck. With some exceptions, the 8th digit is the engine ID and it will either be a 1, 2, D, 6, 8, L, or Y.
What is so special about the LBZ Duramax?
The GM 6.6L Duramax engine was completely redesigned to enhance overall performance and reliability for 2006. The LBZ engine tuning resulted in a significant increase in horsepower and torque, with the power levels getting a bump to 360 hp and 650 lb-ft of torque, up from 310 hp and 605 lb-ft of torque in the LLY.
While previous injector issues were laid to rest with the LLY, the common-rail injection system still had a few minor quirks, along with the injection system still being void of a factory lift pump. But even though it tends to be viewed as the least desirable in the Duramax lineage, the LLY was a very solid engine.
Is LBZ or LLY better? – Related Questions
What’s the best year of LLY Duramax?
Some engines are more popular than others. For example, the pre-emissions Duramax engines made between 2001 and 2007 are highly sought-after for superior reliability.
What’s better LLY or LB7?
The LB7 was the simplest in terms of emissions controls, while the LLY came with the largest turbocharger ever offered. The LBZ packed a host of improvements, including considerably more power, and the LMM was nearly a mirror image of it aside from its use of a diesel particulate filter.
How long do LLY Duramax engines last?
Overall, a properly cared-for Duramax engine should last over 300,000 miles. However, consumers report having Duramax’s lasting in the 500,000-mile range!
What problems do LLY Duramaxs have?
As for the Duramax LLY engine fitted in the 2004 – 2005 Chevrolet Silverado, Hummer H1, and GMC Sierra HD, the most common problems that owners experience include overheating when towing and blown head gaskets. The LBZ is perhaps one of the most desired Duramax engines.
How do you get 30 mpg on a LLY Duramax?
It may be possible to upgrade some of your diesel truck parts for better performance and fuel economy. Let’s take a look at how to get 30+ MPG with a Duramax.
It’s not uncommon to find a slight bend in most (if not all) connecting rods upon teardown of an LLY powered truck churning out 550 to 600-rwhp.
How do you highly idle on LLY?
Can I put a 6 speed Allison in a lly?
The Sun Coast Allison 5-6 Speed Conversion for your GM 6.6L Duramax LLY converts your 5-Speed Allison A1000 Transmission into a 6-Speed like the later models. With the conversion, you can drop 325 engine rpm @ 75 mph with 3.73 gears.
How much HP can LBZ rods handle?
Roadblock #5: Stock Turbo, Injectors and CP3
The LBZ-specific version of the Garrett GT3788VA checks in a hair smaller than the version found on the LLY, but the LBZ is still capable of producing 500 to 530rwhp before it’s out of air.
How long should I let my LBZ warm up?
As a general rule of thumb, if it is below zero degrees Fahrenheit, you should allow your engine up to seven minutes to warm up. If the temperature is between zero and fifty degrees, the warm-up period should be three to five minutes. Over fifty degrees will only require one or two minutes to warm up.
What size turbo does a stock LBZ have?
Duramax Turbocharger Pro Stock Features:
61mm 6 blade compressor wheel. 61mm 10 blade turbine. Electronics included – vane position sensor and vane solenoid.
Pump Rub & Transfer Case Failure: the transfer case inlcudes a gear pump inside of it that is controlled via the mainshaft.
Pistons: while this is really on a problem for high-horsepower LBZ’s, the pistons are known to crack around 600rwhp and shouldn’t be pushed too far above that.
How long do LBZ Duramax injectors last?
The biggest issue with ’01-to-’04 and 1/2 LB7 engines is their fuel injectors’ propensity to fail, typically before an engine reaches 100,000 miles.
Why does everyone want a LBZ Duramax?
To support the power increase over the LLY model, the block was improved, the rods were forged, and the engine was overall built to withstand more power. Because of this, the LBZ is a favorite amongst diesel enthusiasts because of its bolt-on mod performance capabilities.
What does LBZ stand for?
What does LBZ stand for?
Rank Abbr.
Meaning
LBZ
Life Below Zero (TV show)
LBZ
Local Brittle Zone
LBZ
Lutyens Bungalow Zone (New Delhi, India)
LBZ
Local BoyZ
Does the LBZ have a turbo?
The stock LLY/LBZ/LMM turbocharger runs out of air at about 530rwhp. It has trouble controlling egts on extended pulls past 400HP.