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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 i5, i7 rumors surface again

When we first wrote about a rumored BMW i5 in January 2014, after speaking to the Munich-based head of electric vehicle operations and strategy, BMW USA wrote to tell us that the "suggestion of a BMW i model larger than the i3 is hypothetical at this point." After that note came a year of speculation from places like Car and Driver, Automobile and Autocar zeroing in on what this "hypothetical" EV would look like. Car has this year's first scoop, laying out a few more of the ideas behind the expansion of the i line. Said to be aimed straight at the Tesla Model S, it is based on the long-wheelbase, Chinese-market 5 Series but will be badged as either an i5 or an i7. Expected to arrive in time for the 2018 model year to join the next-generation 5 Series, it will be priced to compete with the Model S, but loading up on options can push that beyond $125,000, according to Car. Outside will be a sedan body, possibly with cues from the 6 Series Gran Coupe and the next 7 Series. The internals will be a mix of components like steering, brakes, and suspension from the next ICE 5 Series, with a plug-in hybrid, battery-extending powertrain derived from the i8. Car's info suggests a four-cylinder motor with around 245 horsepower up front, with a 204-hp e-motor also up front and a 90-hp e-motor in the back, as opposed to the i8's single motor. That arrangement provides about 544 total horsepower and will allow the sedan to run in purely electric front- or rear-wheel drive, or as a petrol-electric all-wheel drive. Electric range should be around 80 miles, and the ICE will be limited to operation above 40 miles per hour. There's reason to start putting weight behind these specs because they repeat, almost exactly, those written in the Automobile piece from December. That story said BMW wants to build 30,000 of them per year, and a concept could come in 2017. Featured Gallery 2014 BMW i3: First Drive View 33 Photos News Source: CarImage Credit: Copyright 2015 Sebastian Blanco / AOL Green Rumormill BMW Hybrid Sedan bmw i bmw i5

Driven: 2020 BMW X7 M50i, M760i and M340i | Autoblog Podcast #623

In this week's Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by West Coast Editor James Riswick and Road Test Editor Zac Palmer. They discuss news about the Cadillac V Blackwing, as well as some interesting auction listings that we spied. They also talk about cars from the fleet including the BMW M760i, X7 M50i and M340i. Autoblog Podcast #623 Get The Podcast iTunes – Subscribe to the Autoblog Podcast in iTunes RSS – Add the Autoblog Podcast feed to your RSS aggregator MP3 – Download the MP3 directly Rundown Cars we're driving 2020 BMW M760i xDrive 2020 BMW X7 M50i 2020 BMW M340i Impala auction listing Cadillac V Blackwing news Feedback Email – Podcast@Autoblog.com Review the show on iTunes Related Video: Nissan Frontier and a mid-engine Mustang | Autoblog Podcast #622