BMW is acting quickly to get its new N55 turbocharged and direct-injected inline six-cylinder engine into its lineup, and the 2011 BMW 335i coupe and convertible are next in line. They'll go on sale in Europe in March and likely find their way to the U.S. a few months after that.
The N55 engine features two key changes over the twin-turbo N54 engine in 2010 335i coupes and convertibles: (1) A single, twin-scroll turbocharger in place of two turbos; and (2) the addition of BMW's Valvetronic variable valve lift technology.
The cars won't end up with any more horsepower or torque -- the 3.0-liter six still delivers 300 and 300 -- but the torque now hits at a lower rpm (1,200 versus 1,400), as the new turbocharger builds up boost more efficiently. The engine also uses fuel more efficiently. BMW hasn't disclosed its internal EPA ratings estimates, but we've been told that Valvetronic provides an 8-percent reduction in consumption right off the top.
There's also an emissions benefit, says BMW, as the new turbocharger has one exhaust path and it concentrates those gasses at a single catalytic converter (versus 2 on the N54). The upshot is that runs cleaner during cold starts.
Transmissions will be the same as on 2010 models -- your choice of a six-speed manual or a six-speed automatic. The automatic gets paddle shifters this year.
Rear-drive is standard, with all-wheel drive available on the 335 coupe. BMW predicts the manual-shift, rear-drive 335i coupe will hit 60 mph in 5.3 seconds, while the heavier convertible will take 5.5. The 335xi coupe is said to be the quickest of all with a 5.2-second 0-60 estimate -- likely because it can get the power down better.
Top speed is 130 mph, or 150 with the sport package.
jederino says:
05:34 PM, 02/ 3/10
The N55 engine sounds like a smart upgrade to an already slick motor.