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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 225xe and 330e get official ahead of Frankfurt

BMW is going green at the 2015 Frankfurt Motor Show with the launch of the 225xe and 330e plug-in hybrids, but the Bavarians are spilling the beans about them early. The models are the latest to use Bimmer's eDrive tech that's derived from the i3 and i8. The modular system allows the automaker to roll out PHEVs through its range. For the new 225xe, eDrive makes for an all-wheel drive, PHEV version of the brand's usually front-wheel drive wagon. Other than the door hiding the charging point, the vehicle looks the same as other versions. Underneath the skin, it uses a 134-horsepower, 1.5-liter turbocharged three-cylinder to spin the front-wheels through a six-speed automatic. An 87-hp electric motor with a 7.7-kWh lithium-ion battery turns the rear, and the result is a total system output of 221 hp and 284 pound-feet. BMW claims a sprint to 60 miles per hour in 6.7 seconds, but this 2 Series shines in fuel economy with between 112 and 118 miles per gallon on the European cycle. Multiple driving modes let the driver find the right mix of power and mileage, but the electric range is only 25 miles. Like the standard version, there's no chance of the 225xe coming here, but prices in Germany start at 37,800 euros ($42,050, at current rates) later this year. For buyers wanting BMW's iconic 3 Series as a PHEV, there's the 330e. Again, the only major styling difference is the charging door on the front fender. Its 87-hp electric motor and 181-hp, 2.0-liter turbocharged four-cylinder both send power to the rear wheels. The result is a total system output of 248 hp and 310 lb-ft. The 330e maintains a 50-50 weight distribution, and fuel economy on the European cycle is rated between 112 and 124 mpg. Even with that efficiency, the 330e can get to 60 in 6.1 seconds. The 7.6-kWh lithium-ion battery allows for 25 miles of EV range, too. BMW's gargantuan press release goes into exhaustive detail about every technological element in the two new models. You can check out all of those details below ahead of the Frankfurt reveal, below. BMW eDrive – the latest generation. 1. BMW eDrive technology. Setting a new benchmark for efficiency. The innovative BMW eDrive technology in the new BMW 225xe and new BMW 330e once again underlines BMW's leading role in the premium segment when it comes to powertrain electrification. BMW eDrive technology includes a number of cutting-edge plug-in hybrid components and makes a significant contribution to reducing fuel consumption and emissions.

BMW 3 Series GT gets nip and tuck

We brought you spy photos of the refreshed BMW 3 Series sedan, and now the versatile, hunchbacked Gran Turismo has been caught on camera. As far as refreshed Bimmers go, the treatment for the 3GT is pretty typical. That means a new front bumper and headlights, which we doubt have been changed all that much from the freshened four-door. Changes in back differ thanks to the GT's unique rear end, but the new features – new LED designs in the taillights – will be there. It also looks like BMW has tweaked the rear bumper. Like the sedan, the 3GT will get a few interior tweaks and an iDrive update. Basically, everything we showed you back in May when the updated sedan debuted should find its way onto the 3GT. What we don't know – and what our spies can't tell us – is whether BMW will add GT versions of the 3er's newest models, the 340i and 330e plug-in. We'd expect the 340i to replace the range-topping 335i Gran Turismo, just like it has on the sedan – although a hunchbacked, plug-in hybrid hatchback might just be a bit too niche, even for a brand like BMW. Check out the short gallery of spy photos, available up top. Related Video: Featured Gallery BMW 3 Series Gran Turismo: Spy Shots Image Credit: CarPix Spy Photos BMW Hatchback Luxury bmw 3 series gran turismo