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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.

Nissan, Kia under investigation over occupant detection systems

Kia and Nissan are facing separate investigations by the National Highway Traffic Safety Administration because of alleged problems with the occupant detection systems in their vehicles' airbags. The larger investigation is NHTSA's new engineering analysis into 986,826 Nissan and Infiniti vehicles. They include the 2013 Nissan NV200 and 2013-2014 Altima, Leaf, Pathfinder, and Sentra. Among the Infinitis, there are the 2013 JX35 and 2014 Q50 and QX60. Owners allege the occupant classification system can misidentify passengers and turn off the airbag if they don't weigh enough. Nissan recalled over a million vehicles worldwide last year to fix the same problem with a software update, but NHTSA kept getting complaints about the issue after the repair. The agency opened a preliminary evaluation in March, and after 1,271 complaints it has now been updated to an engineering analysis. The Feds intend to evaluate the effectiveness of Nissan's solution. NHTSA is also opening a preliminary evaluation into the 2007-2009 Kia Spectra for the occupant classification not working properly, and it could affect an estimated 186,000 of these vehicles. The government agency has 43 complaints from people allegedly reporting the failures. According to NHTSA, the issue could result in the airbag not deploying with enough force or not activating at all in an accident. This investigation is meant to assess the scope of the potential flaw, and there's no recall yet. INVESTIGATION Subject : Occupant Classification System Fault Date Investigation Opened: SEP 01, 2015 Date Investigation Closed: Open NHTSA Action Number: PE15031 Component(s): AIR BAGS All Products Associated with this Investigation Vehicle Make Model Model Year(s) KIA SPECTRA 2007-2009 Details Manufacturer: Kia Motors America SUMMARY: The Office of Defects Investigation (ODI) has received 43 complaints alleging a malfunction of the front passenger seat occupant classification system (OCS) in 2007-2009 Kia Spectra vehicles. The complaints report illumination of the SRS (air bag) warning light. All of the complaints allege the cause of the light illumination to be a malfunction of the OCS sensor mat imbedded in the passenger seat cushion, and/or report the presence of diagnostic trouble code B1448 which relates to the OCS sensor mat also. Many of the complaints note the malfunction occurred after the warranty period expired and mention high repair costs as a major deterrent to repairing the vehicle.

Nissan paint prank involves 'world's cleanest' Leaf

If you want attention, then there's nothing like a good prank to get people looking. Nissan is taking a page from the old Candid Camera playbook to show off a new self-cleaning nano-paint technology called Ultra-Ever Dry. Turns out, when you spill a water-based paint on it, the paint just drips right off. And with enough hidden cameras, you can get the perfect passersby "Oh! Huh?" face on film. Part of the "World's Cleanest Car" campaign that Nissan had at the LA Auto Show, the stunt is meant to highlight the fact that the car is clean (i.e., zero emissions) and also clean (not dirty). Get it? Ha! Yeah, well, that's the joke. It works better on video, which you can see below. While the paint thing is mildly interesting (this isn't a production car, and Ultra-Ever Dry is just an example of what could be coming) we did find it notable that this is the first main Leaf campaign we can think of that promotes the car not as a plug-in vehicle first (remember the polar bear?) but as a car with some wacky cool new tech. Oh, and it happens to plug in. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. NISSAN'S "SELF-CLEANING LEAF" HITS THE STREETS, THEN THE WEB – "World's cleanest car" to be featured in an innovative social media campaign starting today – NASHVILLE, Tenn. (December 2, 2014) –The "world's cleanest car" is daring its fans to get it dirty. Starting today, Nissan will launch a social media campaign that will include a series of online videos to showcase a zero-emissions Nissan LEAF with self-cleaning nano-paint technology. Created to demonstrate its potential use in future production vehicles, this LEAF is armed with Ultra-Ever Dry® paint to help repel almost any liquid that may come its way. Nissan first introduced the one-of-a-kind LEAF this past April. "The LEAF is already one of the cleanest vehicles around even without this incredibly innovative paint technology; that said, we're not afraid to get our hands dirty to take this to the next level," said Pierre Loing, vice president, Product Planning, Nissan North America, Inc. "Getting fans involved via this social media campaign is a fun, creative way to show how the LEAF can stay clean no matter how dirty the world around it may be.