2008 Porsche Cayenne Twin Turbo 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.

Porsche 5 Series fighter may be electric

We know that Porsche is developing a seventh model range for its lineup thanks to the March announcement from company boss Matthias Muller. The actual identity of this future vehicle remains a mystery, though. Autocar is coming down firmly on the side of the smaller Panamera, codenamed the Pajun, and speculates the new entry might be available in battery electric and hydrogen fuel cell versions based on recent patent filings. Porsche is famous for sticking with the rear-engine layout on the 911 for decades, even as the company moves the powertrain forward in other models. According to Autocar, the EV version of the Pajun might mark a return to these roots. The German brand is reportedly preparing a modified version of Volkswagen Group's MSB platform for the new vehicle. Called eMSB, the setup puts the batteries and electric motors at the back, and each rear wheel would receive power separately to allow for torque vectoring. The system is estimated to generate 420 horsepower, which is on par with the all-wheel-drive Tesla Model S 85D. The fuel cell Pajun would join the lineup later. The Pajun is rumored to take on the likes of the BMW 5 Series and Mercedes-Benz E-Class, but any luxury EV of that size must count the Tesla Model S as a competitor, too. According to Autocar, the styling takes cues from the Panamera Sport Turismo concept (pictured above) and could launch around 2018. Rumors of Porsche's Tesla-fighter were swirling for months before Muller's announcement, and talk of the Pajun has gone on even longer. Previous reports have suggested the possibility of a 300-mile range and an all-wheel-drive layout with 600 hp. While the actual design has remained ambiguous beyond the potential link to the Panamera, the model was possibly spied last year at the Porsche Design Tower in Florida.

Overnight action from the 24 Hours of Le Mans

We won't go into a recap here, but there are still leading positions being fought for in all classes - it's so close that leads are changing when a car goes into the pits. We'll let the recap wait until the end of the race, so for now enjoy some shots from last night's action at the 24 Hours of Le Mans.