2002 Bmw M3 - Dinan Stage 3 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 solar roof helps i3 drivers even when sun isn't shining

At the Consumer Electronics Show, BMW has announced a release window for its i Wallbox Pro that unites domestic solar power and the electricity grid. The box itself was shown off during last year's i8 drives and it rests inside a solar carport to control the simultaneous delivery of both solar power and the electric grid energy to recharge an i8. One drive attendee wrote how the Wallbox Pro display showed that it was providing 3.4 total kW to the coupe, with 2.8 kW from the sun and 0.6 kW from the grid. At CES, BMW said the i Wallbox Pro, brought to life by BMW DesignWorks, will be available in 2016. For homes that aren't equipped with solar power, or when solar isn't available, the system will draw power from the grid when it's least expensive. The Munich manufacturer also announced a concept storage solution using discarded batteries from its electric cars, where excess energy from solar or other sources could be held for later use for a vehicle or the home itself. BMW will be demonstrating the i Wallbox Pro at CES and the press release below has more information. BMW i Home Charging Services unveiled at the CES Consumer Electronics Show in Las Vegas Pioneering integrated charging solution for electric vehicles brings further reduction in charging costs and integrates home solar generating systems with the household electricity system. Munich / Las Vegas- January 5, 2015... At the Consumer Electronics Show CES 2015 in Las Vegas (6 – 9 January 2015) BMW i will unveil a further innovative product from its 360° ELECTRIC portfolio: BMW i Home Charging Services. This smart solution for home charging of electric and plug-in hybrid BMW models is based on the smart home-enabled BMW i Wallbox Pro system already presented by BMW in spring 2014. How the smart charging service works. Using BMW i Home Charging Services, the vehicle is charged with homegenerated solar power whenever this is available. At other times, or if the household does not have a solar generating system, the vehicle is automatically charged at the cheapest off-peak rates. This makes it possible to take advantage of flexible electricity pricing that varies depending on the time of day. In the USA, this can result in savings of up to 800 dollars a year. With this fully automated charging service, customers get a simple-to-operate system that integrates vehicle charging with the household electrical system and online-based data systems.

BMW i8 could get 300-hp, 2.0L turbo-four

First and foremost, the long-rumored, high-performance BMW i8 will not be called the i8 M. While the lack of an M badge might be a disappointment, it's fair to say the performance of the new model likely won't be. AutoExpress claims BMW is developing a new 2.0-liter, turbocharged, four-cylinder that will take the place of the i8's three-cylinder engine. Offering an even 300 horsepower, up from the current car's 228, total system power would sit around 450 ponies, thanks to the extra cylinder. The electric system won't be fettled with, though. If that still sounds modest, it's because it is – AE's source claims the i8 could handle another 300 hp. BMW would also make a concerted effort to at least maintain the current i8's weight, even with the extra heft of the 2.0-liter turbo to deal with. AutoExpress's source claims that BMW could skip the paint on certain exterior carbon-fiber elements while also offering a more focused, minimalist cabin to save even more weight. According to AE, this new model should arrive as early as 2016, which could result in a debut in Frankfurt this September, Los Angeles in November, or even Detroit, in January.