1970 Porsche 911t Coupe Original Paint on 2040-cars

Auto blog

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.

40+ cars that barely avoid the gas guzzler tax

The Gas Guzzler schedule, with mpg ratings and charges that haven't changed since 1991, lays out which fuel-swillers owe what to Uncle Sam.
I started thinking about the "Gas Guzzler Tax" - considerably less well known as The Energy Tax Act of 1978 - when I was driving Dodge's new Challenger SRT Hellcat last week. Unsurprisingly for a car that can burn 1.5 gallons of gas per minute at max tilt, theoretically able to empty a full tank of premium in about 13 minutes, the Hellcat will be subject to the Gas Guzzler Tax schedule when it goes on sale.

2014 Porsche 911 GT3 and GT3 Cup step out early

Though Porsche won't be feeding us the full 911 enchilada until tomorrow's Geneva-based festivities, we have managed to scare up some official images of the 2014 911 GT3, as well as the all-new 911 GT3 Cup. As Porsche is celebrating 50 years of the 911, we anticipate a good day for great cars.
The new GT3 looks every bit the proper successor to the racy 911 nameplate, with a fixed rear wing large enough to serve cocktails on, a curvaceous body kit and 20-inch wheels that offer a dominating on-road stance. It's a good bet that Porsche will have coaxed something like 450 horsepower from the naturally aspirated, 3.8-liter flat-six engine that hangs over the car's rear axle. A seven-speed manual and Porsche's own PDK transmission are the likely gearbox offerings.
Should the mental quickness and imposing wingery of the standard GT3 not be enough for you, future racecar driver, Porsche is also bringing a GT3 Cup car to Geneva. The German automaker has given just a few scant details about this Cup car - 460 hp on tap, a production run of just 2,400 units - including three images of the kitted out racer. Certainly more and finer details will emerge, when Porsche shines the spotlights on its new 911s tomorrow.