Reports have indicated that the horsepower and torque increase will only be available in 2 nd, 3 rd and 4 th gears (Allison automatic), and the LLY's power/torque will remain at the previous LB7 level of 300/520 in 1 st and 5 th. A torque number of 590 lb-ft for the LLY has been stated in recent television commercials produced by Chevrolet and 590 has shown up in a variety of publications, such as the March/April 2004 issue of Truck Trend magazine. Since then, both GM & Ford have jockeyed for position, and we have since learned that the regular production power/torque specs for the LLY will be somewhat higher. The LLY's 310/565 power level was published (for internal use) sometime mid-2003. The Duramax is more than capable, and the aftermarket has shown us what just a few power enhancements can do to create tire smoking - neck snapping performance. GM has been playing with Duramax power levels, but what actually makes it into production is another matter. As late as a year ago, a 360 horsepower Duramax came up in a discussion. Way back in the fall of 2001, rumors and discussion with industry insiders pointed to a 340 horsepower Duramax 6600 for the 2004 model year. Creating an engine with more power and lower emissions has become more challenging, but that's exactly what the LLY delivers. The technology changes introduced with the LLY address both of these forces. Two forces control diesel engine evolution for all engine manufacturers - Emissions compliance and market share.
REMOVING A HYPERTECH TUNER FROM DURAMAX CODE
Introduced in January of 2004, the RPO code LLY Duramax 6600 incorporates a number of significant technology changes. Numerous new technologies were engineered into the LB7 design, creating an engine package that met both emissions requirements and consumer performance expectations.Įnter the LLY. Not only was it the most powerful engine in this market segment, but it was also a revolutionary step forward in light-truck diesel engine technology and was the first competitive diesel engine designed in recent times for the current light-truck market. The LB7 was introduced in the fall of 2000 with an industry leading 300 horsepower and 520 lb-ft torque rating. The 2001 through mid model-year 2004 Duramax 6600 diesel engine was designated RPO (Regular Production Option) code LB7. , 2004 LLY Duramax 6600 Technology Changes
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