Wednesday, August 8, 2012

German Engineering

2013 BMW M5 Twin-Turbo V8 Revealed
Practically every automaker has an R or a GT or a V or an S or a Spec-Something-or-Other sexing up its catalog. But nobody commits to the job with the fervor of BMW’s M division GmbH. Granted, the gulf between track and street that opened up years ago means that BMW’s speed shop no longer puts motorsport specials on the road with detuned race engines. But that doesn’t mean new M’s are nothing more than Big Macs with barbecue sauce. Okay, maybe the 1-series M sort of is. But take the example of the new 560-hp “M TwinPower Turbo” M5—Bimmer-nerd code: F10—that goes on sale in the U.S. late next summer as a 2013 model.
Shopping Tools Advertisement INSTRUMENTED TESTarrow VIEW PHOTOS (32) | COMMENTS (316) 2013 BMW M5 With its new top sedan, the M division continues to tip its own sacred cows. NOVEMBER 2011 BY AARON ROBINSON Building factory hot rods must be a good business. Practically every automaker has an R or a GT or a V or an S or a Spec-Something-or-Other sexing up its catalog. But nobody commits to the job with the fervor of BMW’s M division GmbH. Granted, the gulf between track and street that opened up years ago means that BMW’s speed shop no longer puts motorsport specials on the road with detuned race engines.

 But that doesn’t mean new M’s are nothing more than Big Macs with barbecue sauce. Okay, maybe the 1-series M sort of is. But take the example of the new 560-hp “M TwinPower Turbo” M5—Bimmer-nerd code: F10—that goes on sale in the U.S. late next summer as a 2013 model. In the F10 M5, you get: a unique engine [see sidebar]; a unique, reinforced and re-ratio’d, seven-speed dual-clutch transmission; and a unique, electronic limited-slip differential with a unique aluminum horse-collar mount for added rigidity. 

There’s a unique suspension with forged aluminum components and nary a part number shared with any other BMW; a unique variable-ratio steering gear with hydraulic instead of electric boost as in other 5s; unique, iron-and-aluminum brake rotors clamped by unique radial-mount, monoblock front calipers housing six asymmetrically sized pistons per wheel; and a unique front crossmember, stiffened and attached by two additional bolts because somebody thought that was important.

 A unique rear-suspension cradle is rigidly mounted to the unibody to eliminate the weight and flex of rubber bushings, unique stiffening rods and shear plates underneath serve as extra bracing, and the car runs enough special software to land it on an asteroid. You may scoff upon learning the M5’s price, expected to fall near $92,000. 

To that prodigious sum we say: How can BMW possibly sell a couple thousand copies per year so cheaply? What does the dedicated tooling cost, anyway? How much is it to change 10 things about an engine, including the induction system and compression ratio, and then recertify it? It’s a lot of Big Macs. Maybe not as many Big Macs as creating a bespoke V-10, as in the previous E60, but a lot. The new M5 will assuredly be profitable. But whether it is spectacular or merely great—many people would put a 4300-pound luxury sedan that hits 60 mph in 3.7 seconds firmly in the former category—it’s definitely no parts-bin badge job.

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