1989 Porsche 911 Carrera Convertible 2-door 3.2l 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.

VW will reportedly offer cash to cheated diesel car drivers

If you're feeling burned by Volkswagen's decision to cheat on diesel emissions tests, you might get some compensation for your troubles. Sources for The Truth About Cars understand that VW will launch a "TDI Goodwill Program" that compensates diesel car drivers with cash in the form of prepaid cards. In the US, you'd get both a $500 universal card as well as a VW-only card worth $500 to $750. The automaker isn't confirming details just yet, but it tells the New York Times that it's planning an announcement on Monday. Dealers also tell the newspaper that they're aware of a program in the works, although they don't know the specifics. It may not include the expanded range of cars reportedly tainted by the scandal, though, since VW is denying claims that it cheated with some models. This isn't the only olive branch VW has been offering: it's been handing out deals to existing owners willing to hop into new vehicles, and there are more discounts than usual across the board. However, the goodwill effort would represent the first instance of VW directly compensating drivers who'd previously thought they were getting an eco-friendly machine. This isn't going to make up for years of unnecessary pollution, but it may represent the company's best hope of holding on to customers. This article by Jon Fingas originally ran on Engadget, the definitive guide to this connected life. ?> News Source: The Truth About Cars via The New York TimesImage Credit: Ralf Hirschberger/dpa via AP Earnings/Financials Green Audi Porsche Volkswagen Hatchback Wagon Diesel Vehicles Sedan vw diesel scandal compensation

Porsche 911 RSR stops just long enough to have its photo taken

When it comes to Porsche and its rapidly escalating endurance racing program, all eyes may be on the new 919 Hybrid - and with good reason: that's the vehicle with which Porsche will be challenging the likes of Audi and Toyota for wins in the top-tier LMP1 class of the FIA World Endurance Championship and at Le Mans. But it's the 911 RSR that does and will continue to form the backbone of the factory's effort.
The 470-horsepower racing version of the road-going 911 took a one-two finish in its class at Le Mans last year, and also won its class at the Daytona 24 this past January as well. This year Porsche will field two of them in the WEC, another two in the United SportsCar Championship here in the US and will sell countless more to customer racing teams that will undoubtedly continue to rack up trophies in racing series around the world. This, then, might be a unique chance to see one standing still. Check it out in our gallery of live images above from the Geneva Motor Show.