The 2013 BMW 135is enters atop the 1 Series range
The heart of the 2013 BMW 135is is the same TwinPower Turbocharged 3.0L inline-6 engine found in the 135i but in “is” form, the N55 engine has been tuned to make 320 horsepower and 317lb-ft of torque – improvements of 20 horsepower and 17lb-ft of torque over the 135i. This has been achieved in part by adding a performance exhaust system and helping to keep this higher performance engine cool is an enhanced radiator fan and an auxiliary radiator. This engine sends the power to the rear wheels via a standard 6-speed manual transmission or an optional 7-speed Double Clutch Transmission (DCT). The rear differential in the 135is features a new final drive to make for a perfect blend of smoothness, performance and fuel efficiency with double helical ball bearings allowing for less differential fluid. This allows the rear diff to reach optimal temperatures more quickly while also having less fluid weight in the vehicle. BMW hasn’t stated exact performance figures but we should expect that the 135is Coupe will best the 5.0 0-60 time of the 135i as well as beating the 130mph top speed.
More importantly, these performance increases to the 2013 BMW 135is Coupe and Convertible come without compromising fuel economy or emission levels compared to the 135i. This means that the 135is Coupe should offer 20mpg around town and 28 on the highway when equipped with the 6-speed manual transmission while the 7-speed DCT 18 around town and 25 on the open road. The 135is Convertible should offer 17 miles per gallon around town and 26 on the highway, whether equipped with the manual or dual clutch transmission.