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Roller coaster or racecar, which pulls more Gs?

Looking for a thrill? You're not the only one. You'll find kindred spirits at airfields going up for a skydive, atop bridges and towers with bungees attached to their feet and standing in line for roller coasters at the local amusement park. But you'll also find them in the paddock at the racing circuit.
So what's the commonality? G-force. It's like gravity, only in each of these cases, it's experienced by human invention. But which activity subjects your body to the greatest amount of g-force? That's what Nissan set to find out.
Before putting them back in the cockpit, Nismo sent out two of its young hot-shoes - Jann Mardenborough and Mark Shulzhitskiy - to an amusement park in the UK with a camera and a g-force meter to find out if any of the coasters could produce as much lateral gravitational force as an LMP2 racing car. See what they found in the pair of videos, below.

Fiat contemplating sub-brand to compete with Dacia, Datsun

You can add Fiat to the admittedly short list of automakers considering a low-cost brand to rival Dacia. The inexpensive Eastern European brand from Renault-Nissan has performed on the balance sheet like a premium model line, and the money the alliance is taking off the table is encouraging other players to deal themselves in. Pretty soon Nissan's Datsun sub-brand will join the Dacia party, going on sale in Russia, Indonesia and India and will claim even more rubles, rupiahs and rupees for the parent company. Volkswagen recently said it will make a decision this year on a budget line for the Chinese market. With the euthanasia of Lancia and plans to move the Fiat brand upmarket, company CEO Sergio Marchionne wonders aloud to Automotive News Europe whether there could be room for a new budget brand underneath Fiat.
We're told that the initiative has been in the idea box for five years and even moved to the stage of name considerations, like Innocenti, but worries about profit kept it from realization. If such a range were to be developed, Marchionne says it couldn't be built in Italy and stay within budget, and the company is "analyzing its manufacturing capacity outside of Europe to see if a low-cost brand is viable."

Jay Leno checks out Nissan IDx Nismo, spiritual successor to classic Datsun 510

Jay Leno may not be spending his night behind the Tonight Show desk anymore, but he's clearly not done rolling precious metal into his garage, intent on putting it through its paces after a thorough investigation. The latest machine to meet Jay on his home turf is the Nissan IDx Nismo Concept that we first saw at the Tokyo Motor Show late last year.
Leno already has love for the classic Datsun 510, which plays a cameo in the video that you'll see below, and he refers to the IDx as the spiritual successor to that car's ethos - driving fun in an affordable package. Fortunately for us, while the IDx is a showcar first and foremost, it is indeed driveable, and Leno, naturally, takes his turn behind the wheel.
Scroll down to watch the complete video below.