1989 Bmw 635csi 5 Speed Manual on 2040-cars

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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 Z4 and Toyota Supra replacement spied in the snow

The new BMW Z4 and Toyota Supra will be the fruit of a marriage of convenience, born from the former's chassis and powertrain expertise and the latter's giant coffers full of money. The final product, spied testing in frigid temperatures in parts unknown, will have specific bodies depending on which brand it carries, so it won't be a simple rebadging exercise. This mule sports a softtop, rather than a retractable hardtop like the existing Z4. Whether this represents a final decision about what type of roof will be fitted to the production model is unclear. What we have heard, repeatedly, is that the chassis and the entire driveline will be pure BMW for both models, and that the main difference will be brand-specific sheetmetal. There are even rumors that an all-wheel-drive version will be available, or that the model will be available as a hybrid using Toyota's expertise in that arena. It's been a long wait since the memorandum of understanding that lead to the mule you see above was signed in 2012, and we had expected an announcement that the roadster would go into production by the end of 2015, but that time has come and gone. Perhaps we'll find out more at one of the upcoming auto shows. Geneva is coming up in March, after all.

BMW NA president says i3 beats Tesla EVs thanks to lighter all-around footprint

Those waiting for a full-out brawl between Tesla Motors head Elon Musk and BMW North America chief Ludwig Willisch will have to wait a bit. For the bloodthirsty, there are signs of some healthy competition and a little bit of green-car sniping between the two automakers. Willisch, speaking at the Detroit Auto Show earlier this month and responding to questions about Tesla, noted (without mentioning that company by name) that the production process of the German automaker's i3 plug-in was "greener" than any other. According to Business Insider, Willisch highlighted the fully recyclable materials used to construct the i3 as well as the hydropower used at the carbon fiber plant in Moses Lake, WA. Willisch also noted that the Tesla Model S is "very heavy on the braking. Our car feels just like a normal car. That's a big difference when it comes to driving," Automotive News said in a separate report. The latter model weighs about a third less than the Tesla, though it also has an EV range about a third as big. The BMW executive did allow that the Tesla did make a good proverbial "snowplow," not for its driving characteristics but for its ability to get more people conformable with electric vehicle technology. Musk was asked about the i3 in an August conference call and laughed before noting that the i3 had "room to improve." No word on whether Musk and Willisch will be sending each other Valentine's Day cards next month.