This picture is a little misleading. Unfortunately, this isn't a post about a race on a frozen lake or a snow covered rally stage involving the three hottest AWD hot hatches (the WRX STI only a hatch in spirit). This is about the highly anticipated test recently posted by Car & Driver. First things first, I wish C&D would stop testing 30-50 mph and 50-70 mph in top gear for manual performance cars. They are hugely (almost exclusively) influenced by gearing and are completely irrelevant. I could see them being relevant in a more mainstream class (say, comparing a base Focus manual to a base Cruze manual) because an average buyer may not want to shift. But there is no way the buyer of any of these cars is going to wait over 7 seconds to go from 30-50 or approximately 6 seconds to go from 50-70? Worse yet, why would anyone floor a small 4 cyl turbo in an overdrive gear and lug the engine outside of boost? Now with the rant out of the way, let’s look at numbers.
BMW M2 equipped with an eLSD - BMW © A few weeks ago, I posted about traditional clutch-type limited slip diffs (LSD's) and how they work. You can read about those in the previous post: How Limited Slip Diffs Make You Faster on Track . But as you might know or have learned from reading the article, they aren't without their faults, which means engineers are always working to get around those limitations. You may not be surprised to learn that something like the Ferrari 488 GTB doesn't use a traditional limited slip diff, but it's not limited to super cars, far from it. Cars like the Golf GTI, the Civic Type R, various Mustangs, Corvettes, and BMW M cars, and even the Lexus RC F and GS F, all avoid a traditional limited slip diff in favour of one of these technologies. To keep things simple, I'll focus on two wheel drive vehicles. The vast (vast) majority of principles apply to all and 4 wheel drive vehicles, but there are some subtle differences that I'll