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BMW's DTM champ swaps rides with Mini's Dakar winner

BMW may not race in F1 any longer, and it doesn't compete with Audi and Porsche in the LMP1 class at Le Mans. It even shut down Mini's short-lived effort on the World Rally Championship. But that doesn't mean it doesn't race at all. In fact it's the current reigning champion both in DTM and at Dakar. So to highlight its varied motorsport programs, the German automaker had two of its top drivers swap rides. German driver Martin Tomczyk, who won the DTM title in 2011 and now drives for BMW, took to Nasser Al-Attiyah's Mini All4Racing Countryman on the sand dunes of Dubai. Meanwhile the Qatari driver, who has won the Dakar Rally two times now, took to the wheel of Tomczyk's BMW M4 DTM around Oschersleben in Germany. They even repeated the game of musical chairs at Hockenheim over the weekend. If anything, the promo clip shot by Red Bull just goes to show how different the varied racing machinery can be, and the challenges posed to racing drivers switching between disciplines. But lessons aside, it's a cool clip, so check it out above. Two champions swap cockpits: Martin Tomczyk drives the MINI ALL4 Racing, Nasser Al-Attiyah the BMW M4 DTM. Munich (DE), 1st May 2015. From asphalt to sand and back again: BMW DTM driver Martin Tomczyk (DE) and MINI ALL4 Racing ace Nasser Al-Attiyah (QA) both entered unfamiliar territory and took each other's cars for a test drive. As part of a video shoot for BMW Motorsport Premium Partner Red Bull in Dubai (AE), Tomczyk, a proven master of his trade on asphalt as the 2011 DTM Champion, took the wheel of the MINI ALL4 Racing, with which X-raid has won the famous Rally Dakar the last four years. During DTM testing in Oschersleben (DE), Al-Attiyah was given the opportunity to drive Tomczyk's BMW M Performance Parts M4 DTM. Two wins at the Rally Dakar are just some of the successes the rally driver from Qatar has had to date. He followed up his first victory in 2011 by winning in the MINI ALL4 Racing in January 2015. "Driving the MINI ALL4 Racing through the sand and over the dunes in Dubai was a fascinating experience and was so much fun," said Tomczyk. "The car has an incredible amount of torwue – and the test in the dunes was an amazing adrenalin rush even for an experienced race driver such as myself. It's totally different to driving on a circuit.

Is the skill of rev matching being lost to computers?

If the ability to drive a vehicle equipped with a manual gearbox is becoming a lost art, then the skill of being able to match revs on downshifts is the stuff they would teach at the automotive equivalent of the Shaolin Temple. The usefulness of rev matching in street driving is limited most of the time – aside from sounding cool and impressing your friends. But out on a race track or the occasional fast, windy road, its benefits are abundantly clear. While in motion, the engine speed and wheel speed of a vehicle with a manual transmission are kept in sync when the clutch is engaged (i.e. when the clutch pedal is not being pressed down). However, when changing gear, that mechanical link is severed briefly, and the synchronization between the motor and wheels is broken. When upshifting during acceleration, this isn't much of an issue, as there's typically not a huge disparity between engine speed and wheel speed as a car accelerates. Rev-matching downshifts is the stuff they would teach at the automotive equivalent of the Shaolin Temple. But when slowing down and downshifting – as you might do when approaching a corner at a high rate of speed – that gap of time caused by the disengagement of the clutch from the engine causes the revs to drop. Without bringing up the revs somehow to help the engine speed match the wheel speed in the gear you're about to use, you'll typically get a sudden jolt when re-engaging the clutch as physics brings everything back into sync. That jolt can be a big problem when you're moving along swiftly, causing instability or even a loss of traction, particularly in rear-wheel-drive cars. So the point of rev matching is to blip the throttle simultaneously as you downshift gears in order to bring the engine speed to a closer match with the wheel speed before you re-engage the clutch in that lower gear, in turn providing a much smoother downshift. When braking is thrown in, you get heel-toe downshifting, which involves some dexterity to use all three pedals at the same time with just two feet – clutch in, slow the car while revving, clutch out. However, even if you're aware of heel-toe technique and the basic elements of how to perform a rev match, perfecting it to the point of making it useful can be difficult.

BMW 4 Series Gran Coupe caught again

It's been a while since we've seen the upcoming BMW 4 Series Gran Coupe out testing, but we're sort of inclined to ask "Why?" yet again. After all, the 4 Series is what the new 3 Series-based coupes and convertibles will be called, so the idea of another four-door version just sort of seems redundant. In other words, just how different will a 4 Series Gran Coupe be from a 3 Series sedan, aside from perhaps a more rakish roofline or a four-passenger seating configuration? Probably not much, but BMW clearly thinks it can use the additional bodystyle to rake in some extra profits.
Anyway, back to these spy shots. No more of the 4GC's skin has been revealed since the last time we saw it, but we fully expect it to share a lot of its design DNA with the 3 Series sedan, not to mention the attractive 4 Series coupe concept that bowed at this year's Detroit Auto Show.
Powertrain options should carry over direct from the 3 Series line, so we expect to see 428i and 435i models on hand, packing turbocharged four- and six-cylinder engines, respectively. We're sure that BMW's xDrive all-wheel drive will be available, and who knows, we could even get a 428d version with the new 2.0-liter turbodiesel four that debuted in the 328d at the New York Auto Show last week, or even an M4 variant.