The LBZ was the first Duramax to be coupled to the 6-speed Allison 1000 automatic, which proved capable of handling more power than the five-speed version that preceded it. The combination of new mechanical components and an upgraded ECM made the 2006-2007 Duramax LBZ the most reliable, durable, and powerful Duramax up to that point. This was also the first application to use a new 32-bit E35 controller, which adjusts and compensates for the fuel flow to bolster efficiency. A larger turbocharger inlet manifold was added to help lower intake and exhaust temperatures while improving responsiveness from the Garrett GT3788VA variable-vane turbocharger (VVT). The Bosch solenoid-style fuel injectors were updated to a 7-hole nozzle that sprayed fuel directly onto the new fast-heat glow plugs when cold to provide faster start-up. The reliable Bosch CP3 injection pump was still used but maximum pressure increased from 23,000 psi to more than 26,000 psi. One of the main components to the increase in power was upgrades to the common-rail fuel system. New cast-aluminum pistons were also utilized to lower the compression ratio.
The I-beam style connecting rods featured more material in critical areas to increase their overall strength.
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The forged steel connecting rods with a cracked capped construction were similar to previous iterations but were reinforced to handle the increase in horsepower and torque. In addition, the engine internals were revised for additional durability. Minor changes were also made to the crankshaft, along with the use of a new reluctor wheel. Taller main bearing caps and deeper bores for the main cap bolts were also employed. Preparing for additional horsepower and torque, more webbing was now cast into the main bearing areas of the block.
The cast-iron block received casting and machining changes to help strengthen the bottom of the cylinder bores. The solid foundation of a cast-iron block and aluminum heads were carried over, but they received numerous upgrades in 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. The GM 6.6L Duramax engine was completely redesigned to enhance overall performance and reliability for 2006. The Duramax LBZ was introduced for the 2006 model year and eventually retired halfway through the 2007 model year but remains an extremely popular choice with diesel enthusiasts to this day. Posted on Januby Jeremy_XDP 0 History/General Info Buyers Guide, Duramax 2006-2007 GM 6.6L LBZ Duramax Buyer’s Guide
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