1957 Porsche 356a Speedster....no Reserve.....by Vintage Speedsters on 2040-cars

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Porsche Museum highlights history of the 911 RSR

Porsche has amassed quite an impressive trophy case in just about every racing series it has ever entered, and one of its most dominant machines has to be the 911 RSR from the 1970s. Taking part in various GT-class competitions, the 911 RSR managed to take home three international and seven German victories in 1973, its very first year of competition.
Not one to downplay its racing successes, Porsche has released an informative video detailing the 911 RSR's impressive heritage. The 1973 RSR model owned by the Porsche Museum is detailed beautifully on video, and we have to say it looks absolutely stunning in its vintage Martini Racing livery.
Have a look at the video below for some historic racing action, along with static shots of one of our favorite Porsche models ever created.

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.

Magnus Walker pops up again, this time with his Irish Green 911

He was the subject of a short film called Urban Outlaw. He has been on Jay Leno's Garage. Twice. He even graced the cover of Road & Track in June. And after all of that, he appeared in a video by Hong Kong-based Silly Thing. So it isn't really surprising that Magnus Walker is at the center of attention in the latest video from XCAR, but it's surprising - and a treat - to see his mostly original Irish Green 1966 Porsche 911.
Powered by an air-cooled 2.0-liter flat six with 130 horsepower (more like 120 hp today, Walker says), riding on 5.5-inch wide wheels and turned with a wooden steering wheel, the little green 911 does represent some of the best aspects of classic car motoring.
Head on below to watch the long-form video on Walker and his Porsche, but if your time is limited, you're not missing much if you call it quits at five minutes - especially if you've seen his aforementioned videos before.