The current US line-up for the Z4 includes three models: Z4 sDrive30i, Z4 sDrive35i, and Z4 sDrive35is.The first vehicle to benefit new 4-cylinder engine to the U.S. lineup is the 2012 BMW Z4. This new 2012 BMW Z4 model will go on sale this autumn, will replace the BMW Z4.
The entry level model is powered by a 3.0-liter, inline 6-cylinder engine that delivers 255 HP, but that will be changing next year when the six-cylinder engine is dropped in favor of a turbocharged four-cylinder powerplant.
The new mill uses a BMW’s triple threat of twin-scroll turbocharger, direct injection, and Valvetronic to produce 240 hp and 260 lb-ft of torque. Replacing the naturally aspirated 3.0-liter inline-six found in the Z4 sDrive30i, it is down 15 ponies, but hits its power peak 1500 rpm earlier, at 5000 rpm. Additionally, the four gains 40 lb-ft of torque, and full twist is available at just 1250 rpm.