1991 Bmw E.30 M3 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 preparing 'optimized driveline' for i3, provides more range

Autocar reports that BMW is preparing upgrades for the all-electric i3 that will greatly extend its range. Company sources called it an "optimized driveline," powered by a new, 22-kilowatt-hour lithium-ion battery. That's the same capacity as the battery in the current hatchback but it will have a higher density. Combined with improved electronics and new software for battery cooling and the electric motor, Autocar's unnamed BMW source said the new internals will be good for "well over 124 miles in real-world use." The Environmental Protection Agency rates the present i3 as having 81 miles of range, meaning this tweaked version would be a 50-percent improvement if that range number applies to the US market (it's likely the more lenient European number, since Autocar is a UK publication). BMW said the update takes advantage of gains in battery efficiency over the past two years. The i3 with the range extending engine would also get the update, and current owners will reportedly (and surprisingly) be able to purchase the revised powertrain for retrofitting. The Autocar report appears to back up a recent article in German newspaper Die Zeit in which BMW CEO Harald Kruger said the the i3 will get more range next year, and "Another technology leap is going to come in three or four years." The i3 was designed for to make these kinds of upgrades easy to manage. We wait to find out when it will be available, whether it will increase the price of a new car, and how much it will cost current owners to retrofit. Featured Gallery BMW i3 Shadow Sport Edition: LA 2015 News Source: Autocar via World Car FansImage Credit: Copyright 2015 Sebastian Blanco / AOL Green BMW Hatchback Electric Luxury range anxiety bmw i3 rex

2016 BMW X4 M40i Quick Spin

There's only so much you can do to disguise the SUV-ness of a crossover. The physics are simply against it. Essentially a jacked-up wagon, the X4 is heavier and has a higher center of gravity than a 3 Series longroof. No matter how many badges or what sort of fancy suspension you throw at it, you can't defy the essential laws that govern the mechanics of the universe. This isn't to say that BMW is standing in the surf, ordering the waves to roll backward. The X4 is a valiant, if misguided effort, in injecting some sportiness into a very niche vehicle. The X6 M, a "full" M Division offering, does a decent job at this: it's quick like a rocket-assisted hippopotamus, and uses some black magic to stay planted. The X4 M40i, a less-full-blown M Performance model, is less dramatic, and less compelling. Here's the operating theory: this crossover won't sell on its dynamic charms, however superior to its X4 xDrive28i and xDrive35i siblings. It'll sell because it's the top of the X4 heap, the most expensive of the three ($58,795!), and with the most "M" badges. Anyone looking for utility and strong handling dynamics should examine a 3 Series xDrive Sports Wagon with the M Sport Package and the $700 Adaptive M Suspension, pocket the $10k, and marvel at the size and shape of the cargo area. Driving Notes: This is the same engine as seen in the brand new M2, making 355 horsepower and 343 pound-feet of torque in this application. That's 10 hp down from the M2. There's lots of torque, and with an intentional stab of the go-pedal, this X4 will scoot. The eight-speed auto is great heading through the ratio range – its shifts are swift and sharp. The paddles will hold gears to redline in manual mode, but would you really want to? We ignored them. The adaptive dampers have their work cut out for them. This is a 4,235-pound vehicle – a full 340 pounds heavier than a diesel, all-wheel-drive, 3 Series Sports Wagon, and 7.6 inches taller – and this is where physics comes into play. Slalom-like quick corners produce an uncomfortable jacking effect as the outer wheels unload and transfer weight to the other side. It handles well, for a hippo. Since hustling the X4 M40i is possible but not all that rewarding, know that it's very pleasant in Comfort mode. The extra oomph is realized as a thick, broad, rich torque band, and that's never a bad thing around town. It's nicely dampened in Comfort, without much wallow.