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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.

2015 BMW 4 Series convertibles recalled to fix airbag programming woes

A problem with the airbags on the 4 Series convertible has promoted BMW and the National Highway Traffic Safety Administration to issue a recall for some 2,000 vehicles across the United States. The issue, according to the notice below, relates to the driver's side front airbag, whose timing for deployment may be off. And if the airbag doesn't deploy at the right time in the event of a crash, that's more likely to result in an injury. As a result, BMW of North America is calling in 2,067 vehicles – specifically the 428i, 428i xDrive, 435i and 435i xDrive convertibles of the 2015 model year and manufactured between October 22, 2014, and February 27, 2015. Those units will simply need to have the software in the airbag control module reset, and will begin undertaking that process in April.Related Video: Report Receipt Date: MAR 13, 2015 NHTSA Campaign Number: 15V148000 Component(s): AIR BAGS Potential Number of Units Affected: 2,067 Manufacturer: BMW of North America, LLC SUMMARY: BMW of North America, LLC (BMW) is recalling certain model year 2015 428i Convertible, 428i xDrive Convertible, 435i Convertible, and 435i xDrive Convertible vehicles manufactured October 22, 2014, to February 27, 2015. Due to a programming error, the driver's front air bag deployment timing may be incorrect. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) No. 208, "Occupant Crash Protection." CONSEQUENCE: If the driver's front air bag deployment timing is incorrect, there is an increased risk of personal injury in the event of a vehicle crash. REMEDY: BMW will notify owners, and dealers will reprogram the air bag control module with corrected software version, free of charge. The recall is expected to begin in April 2015. Owners may contact BMW customer service at 1-800-525-7417. NOTES: Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.safercar.gov.

BMW 2 Series specs leaked?

Thanks to spy shots from earlier in the year, we already know what the new BMW 2 Series will look like, but now we know a lot more about the coupe courtesy of an apparent BMW South Africa error and some quick-clicking enthusiasts. Though the information no longer appears to be posted on BMW's South African website, 2addicts.com managed to grab most of the details for the new coupe, including the model lineup, specs and most (if not all) of the options list for the upcoming replacement for the 1 Series.
Just like the latest 3 Series, the 2 Series model lineup starts at the 220i powered by a 2.0-liter inline four-cylinder, but the more exciting BMW figures to be the M235i with its 320-hp, 3.0-liter straight-six. With the automatic transmission, the info says that the M235i weights 3,240 pounds and will be able to accelerate from 0-62 miles per hour in 4.8 seconds - making it both lighter and quicker than the 135is currently offered in the US. The base 220i coupe should also be fun to drive with its 180 horsepower and sub-3,000 pound curb weight.
A quick side-by-side comparison of the dimensions for the base 220i with our current base 128i shows that the new coupe rides on a longer wheelbase (105.9 in. vs. 104.7 in.), is about two inches longer (174.4 in. vs. 172.2 in.) and is an inch wider (69.8 in. vs. 68.8 in.). 2addicts.com even shows available paint colors, interior trim options and lists pricing for South African-spec models. Head on over to the forum to check out all the info they have posted, but we expect the 2 Series to be unveiled at the Detroit Auto Show early next year.