Volkswagen subsidiary Audi first installed a 1.8-liter turbocharged engine, known as the 1.8T, in its 1997 Audi A4. As opposed to the standard four-valve setup in most car engines, the Audi 1.8T used five valves per cylinder. After the success of the A4, Audi began using this engine in other models. The company discontinued this engine for its cars in 2006, when it produced the 2.0-liter TFSI engine.
Audi installed the first version of its 1.8T engine in its A4 series vehicles from 1997 to 2000. A4s manufactured from 2001 to 2005 used a second version of this engine. The A3 series sold in European and other non-American markets from 1999 to 2005, and included the 1.8T engine as well. In 2000, Audi initially offered a 180-horsepower variant for the TT Coupe and TT Roadster; 2001 to 2006 models of the TT utilized either a 180- or 225-horsepower version of this engine.
Audi A4 1997 to 2000
Audi built the original 1.8T with an iron block and aluminum alloy heads. This engine had a bore of 3.18 inches, a stroke of 3.4 inches and a compression ratio of 9.5-to-1. The company equipped this engine with a multiport fuel injection system, dual overhead cams and five valves per cylinder. This engine generated 150 horsepower at 5,700 rpm and 155 foot-pounds of torque at 1,750 rpm.
Audi A4 2001 to 2005
The 2001 to 2005 version of this engine shared the same iron block and aluminum head construction of the previous version. It also had a 3.18-inch bore and 3.4-inch stroke. This engine used dual overhead cams with five valves per cylinder, and sequential electronic fuel injection.
Audi reconfigured the cylinders to give it a lower 9.3-to-1 compression ratio. According to "Cars.com," Audi also adjusted the turbocharger to deliver the boost at a lower engine speed. These changes increased the 1.8T horsepower to 170 at 5,900 rpm and increased the torque to 166 foot-pounds at 1,950 rpm.
The 1999 to 2005 A3s sold outside the U.S. had a 1.8T engine with a bore of 3.18 inches and a stroke of 3.4 inches. The A3's 1.8T had a compression ratio of 9.5-to-1. Audi equipped these engines with multi-port fuel injection, dual overhead cams and four valves per cylinder. This 1.8T produced 177 horsepower at 5,500 rpm and 173 foot-pounds of torque at 1,900 rpm.
Audi offered two configurations of the 1.8T for its TT Coupe and Roadster. Both engines consisted of a cast-iron block with aluminum heads. Each had a bore that measured 3.18 inches and a 3.4-inch stroke for an overall displacement of 1,781 cc. These engines used an electronic multi-point sequential fuel injection setup, dual overhead cams and five valves per cylinder.
The first variant of this engine had a compression ratio of 9.5-to-1 and produced 180 horsepower at 5,500 rpm and 173 foot-pounds of torque at 1,950 rpm. Audi reconfigured the second variant to have a compression ratio of 9.0-to-1. This engine produced 225 horsepower at 5,900 rpm and 207 foot-pounds of torque at 2,200 rpm.
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