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Porsche accused of using steering inputs to cheat on emissions tests

Last week, the German transport authority KBA announced it was investigating Porsche and Audi for cheating on emissions tests. Wirtschaftswoche, a German economic publication, says the KBA's investigation focuses on a system that uses steering inputs to determine whether or not the car is being tested. While Audi has recalled 24,000 models, Automotive News reports that currently Porsche denies any wrongdoing. According to KBA, if the affected cars measured a steering input of 15 degrees or more, they would emit excess nitrogen oxide emissions. It's important to note that this is different than Volkswagen diesel CO2 emissions. The cars broke European strict emissions standards, so it's unclear what impact this has on cars in the US. Audi has recalled the A7 and A8, though it's unclear which Porsche models the KBA is investigating. Fifteen degrees is a small amount of steering input. The wheel can move that much just to move around a pothole or bump in the road. Essentially, if you're driving, you're moving the wheel at least 15 degrees in one direction or the other. If these allegations turn out to be true, it's going to be another blow to Volkswagen, Audi, and Porsche. While public trust in Volkswagen is supremely low, for the most part, Porsche's image has remained fairly clean. NOx emissions don't have as big of a long-term effect as CO2, though they're still bad for humans. Related Video: News Source: Wirtschaftswoche, Automotive News Government/Legal Green Recalls Audi Porsche Emissions

Porsche suspends ties with Maria Sharapova after drug test

Porsche has reportedly suspended ties with Maria Sharapova after the Russian tennis star failed a drug test. The German automaker stopped short of terminating its relationship with the athlete altogether as it awaits the results of a deeper investigation. The issue emerged at the Australian Open, where Sharapova reportedly tested positive for use of a drug called meldonium. Manufactured in Latvia and prescribed in many former Soviet Bloc countries, meldonium is used to treat heart conditions and improve cardiac circulation. It is not approved by the FDA for use in the United States, and the World Anti-Doping Agency added it to its list of prohibited substances at the start of this year. Sharapova admitted that she's been taking the medication for ten years now but that she did not keep up to date on the WADA's list. Since it is considered a prohibited substance, she's been excluded from participating in the Australian Open this year, and suspended from competition as of March 12. She was also scheduled to take part in the Porsche Grand Prix, a tennis event sponsored by the carmaker in Stuttgart next month which she will now apparently have to miss. One of the top-rated female tennis players in the world, Sharapova has served as a brand ambassador for Porsche since 2013. Other sponsors including TAG Heuer and Nike have also reportedly suspended their relationships with the athlete pending further investigation by the International Tennis Federation. Related Video:

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.