Like the BMW 1-Series Coupe, there are also two BMW 1-Series Convertible versions are available with inline-6 power: the 128i and the 135i. Powered by a 3.0-liter, 230 horsepower inline-6 engine that generates 200 lb-ft of torque, the 128i Convertible features BMW’s Valvetronic throttle-less intake technology and aluminum/magnesium construction – core elements of BMW’s EfficientDynamics.
2012 BMW 135i features BMW’s newest, 3.0-liter inline-6 engine. Equipped with a single, twin-scroll turbocharger and BMW’s revolutionary Valvetronic throttle-less intake technology, the engine produces 300 horsepower and 300 lb-ft of torque. Refered to internally as the “N55″, the engine reaches peak torque at 1,200 rpm and maintains peak torque all the way to 5,000 rpm. With High Precision direct gasoline injectors, optimum performance and fuel efficiency are achieved with even faster engine response across the entire engine speed range. For the 135i Convertible, acceleration from 0-60 mph is accomplished with the standard 6-speed manual transmission in 5.4 seconds.
The 135i can be equipped with BMW’s 7-speed Double Clutch Transmission (DCT), as featured on the BMW Z4 Roadster. Equipped with DCT, the 135i Convertible will accomplish the 0-60 mph sprint in a scorching 5.3 seconds. A 6-speed Steptronic automatic remains o ptional on the 128i. So equipped, the 128i Convertible runs 0-60 mph in 7.0 seconds, or 6.4 seconds with the standard 6-speed manual transmission.
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