BMW M vehicles typically used manuals and semi-automatic transmissions (the most recent type being a dual clutch transmission), in contrast to Mercedes-AMG which largely has automatic transmissions (the 7-speed AMG SpeedShift MCT dual clutch transmission
was used on new models from 2009 onward). However, the BMW X5 M and X6 M
were the first M-vehicles offered with automatic transmission, a
6-speed Steptronic unit, since this works with xDrive.
BMW M engines were traditionally low displacement naturally aspirated high revving engines, particularly the S85 V10 in the E60 M5 and E63 M6 and the related S65 V8 in the E90 M3. These are the most powerful engines BMW has ever built (not including BMW's S70/2) without supercharging or turbocharging, with an output of 100 hp per liter of displacement, and each has won numerous International Engine of the Year Awards.[9][11][12] As late as the early 2000s, BMW regarded forced-induction (supercharging or turbocharging) as low-tech shortcuts to boosting horsepower, stating that this adds weight and complexity while reducing throttle response.[10] BMW purists have noted that while forced induction and/or large displacement does produce more torque for better day-to-day driving, most of them like the "character" and sound of low displacement naturally aspirated engines with high redlines.[13]
However, the late 2000s international regulations trends on reducing CO2 emissions and fuel consumption are cited as the reasons not to continue further development on naturally aspirated high redline engines. The N54 twin-turbo inline-6 which debuted in the 2007 BMW 335i (E90) gives almost equivalent performance to the E46 and E90 iterations of the BMW M3, while being much more practical and fuel-efficient as a daily driver.[14] Starting with the X5 M and X6 M, and featured in the F10 M5, BMW used the twin-turbocharged S63 which not only produces more horsepower and torque, but is also more efficient than the S85 V10. Also unlike the S85 and S65 which do not share a design with non-M BMW engines, the S63 has significant parts commonality with the base N63 V8 engine (which is also has twin turbochargers) making them less expensive to build.[15][16] At the present (2012), BMW has not considered supercharging yet.[17]
As of the 2013 model year, the BMW M3 (E92/E93) is the only "traditional" M car left, as the rest of the M lineup features turbocharged engines, and the next iteration of the M3 (F80) and M4 (F82/F83) are expected to feature a twin turbo straight-6 engine.
BMW M engines were traditionally low displacement naturally aspirated high revving engines, particularly the S85 V10 in the E60 M5 and E63 M6 and the related S65 V8 in the E90 M3. These are the most powerful engines BMW has ever built (not including BMW's S70/2) without supercharging or turbocharging, with an output of 100 hp per liter of displacement, and each has won numerous International Engine of the Year Awards.[9][11][12] As late as the early 2000s, BMW regarded forced-induction (supercharging or turbocharging) as low-tech shortcuts to boosting horsepower, stating that this adds weight and complexity while reducing throttle response.[10] BMW purists have noted that while forced induction and/or large displacement does produce more torque for better day-to-day driving, most of them like the "character" and sound of low displacement naturally aspirated engines with high redlines.[13]
However, the late 2000s international regulations trends on reducing CO2 emissions and fuel consumption are cited as the reasons not to continue further development on naturally aspirated high redline engines. The N54 twin-turbo inline-6 which debuted in the 2007 BMW 335i (E90) gives almost equivalent performance to the E46 and E90 iterations of the BMW M3, while being much more practical and fuel-efficient as a daily driver.[14] Starting with the X5 M and X6 M, and featured in the F10 M5, BMW used the twin-turbocharged S63 which not only produces more horsepower and torque, but is also more efficient than the S85 V10. Also unlike the S85 and S65 which do not share a design with non-M BMW engines, the S63 has significant parts commonality with the base N63 V8 engine (which is also has twin turbochargers) making them less expensive to build.[15][16] At the present (2012), BMW has not considered supercharging yet.[17]
As of the 2013 model year, the BMW M3 (E92/E93) is the only "traditional" M car left, as the rest of the M lineup features turbocharged engines, and the next iteration of the M3 (F80) and M4 (F82/F83) are expected to feature a twin turbo straight-6 engine.
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