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2015 SEMA Show Recap | Autoblog Minute

We take a trip to Las Vegas for a preview of the 2015 SEMA Show, the trade show for automotive aftermarket professionals and enthusiasts. Autoblog's Eddie Sabatini reports on this edition of Autoblog Minute, with commentary from Senior editor, Greg Migliore. Chevrolet Ford Honda Mazda Autoblog Minute Videos Original Video galpin

GM sweetens military discount for Buick, Chevy and GMC

American servicemen and women interested in a new vehicle from Chevrolet, Buick or GMC now have a bit more incentive to head down to their local dealer, as General Motors has announced plans to improve its military discount program.
The new GM Military Discount Program offers eligible consumers a new Chevy, Buick or GMC at invoice pricing, which in some cases can take very large chunks out of a car's retail price. When factored in with other incentives, most of which are available with the Military Discount, the bargains are thick on the ground for members of the US armed forces.
GM's Retail Sales and Marketing Support general manager, Chuck Thomson, said, "GM has long supported the military and military families, and we hope this simplified and enhanced discount will show our appreciation for their service and help make it easier for them to own one of our great new vehicles." The program is open to all active duty and reserve members in the Army, Navy, Marines, Air Force, National Guard and Coast Guard, as well as veterans that have been out of the service for less than a year. Military retirees and their spouses are also eligible for the discount.

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.