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Horsepower gains from underdrive pulleys can vary by vehicle, engine, number of accessories and the amount of underdrive (improvements of up to 5–15 HP at the wheels have been seen). Additional and significant performance improvements can be seen by reducing the weight of the pulley versus the original pulley.
The goal of performance exhaust headers is mainly to decrease flow resistance (back pressure), and to increase the volumetric efficiency of an engine, resulting in a gain in power output. The processes occurring can be explained by the gas laws , specifically the ideal gas law and the combined gas law .
A header is a manifold specifically designed for performance. [1] During design, engineers create a manifold without regard to weight or cost but instead for optimal flow of the exhaust gases. This design results in a header that is more efficient at scavenging the exhaust from the cylinders.
These numbers matched the performance figures of a base model C4 Corvette and GMC Syclones/Typhoons of that era. [3] Motor Trend also tested an LPE-built Impala SS that had the same performance numbers as the last generation M5 (0-60 4.7 sec) due to its bored and stroked LT-1 (displacement rose to 383 in 3 and horsepower rose to 425). [4]
Dinan was founded in 1979 by Steven Dinan, an engineering student at the time. It was incorporated in 1982 as Bavarian Performance, Inc. in Morgan Hill, California., [1] and was renamed Dinan Engineering, Inc. [2] in 1988. In 2013, Steve Dinan sold Dinan to private equity group Driven Performance Brands. [3]
Aftermarket extractor manifold In a four-stroke engine , an exhaust manifold which is designed to maximise the power output of an engine is often called "extractors" or "headers". The pipe lengths and merging locations are designed to assist in filling the cylinder with the next intake charge using exhaust scavenging . [ 1 ]
In 2006 Honda created the J30A5 to mark the 30th anniversary of the Accord. It boosted output to 244 hp (182 kW) (SAE Net 08/04) and 211 lb⋅ft (286 N⋅m) (SAE Net 08/04) of torque. According to Honda, horsepower gains were achieved with improvements to the airflow of the intake and exhaust system.
Hennessey Performance Engineering (HPE) is an American hypercar manufacturer and high-performance vehicle creator. In addition to building the Venom F5 hypercar, the company specializes in 'making fast cars faster' modifying sports cars from several brands including Chevrolet , Dodge , Cadillac , Jeep , [ 1 ] Ford , GMC , and Lincoln .
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