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One Lap of the Web: Elon Musk's Hyperloop, Greenwich Concours and a Model T

We spend a lot of time on the Internet -- pretty much whenever we're not driving, writing about or working on cars. Since there's more out there than we'd ever be able to cover, here's our daily digest of car stuff on the Web you may not otherwise have heard about. The 2013 Porsche Rennsport Australia went off over Memorial Day weekend at Sydney Motorsports Park and motorsportretro.com has full gallery of pictures.

Alfa Romeo 4C concept

Following the limited production run of the 8C super car, Alfa Romeo unveiled its new sports car at the Geneva motor show – the 4C. The compact, lightweight and mid-engined sports car is a departure from anything Alfa Romeo is producing at the moment. Taking influence from the 8C's strongest attributes, it also mixes in a new design language for the Italian brand.

Guess Jethro's lap time and win a £550 Suunto watch

CAR journo Jethro Bovingdon drove the Lotus Exige 260 Cup around the track at Lotus HQ in Hethel, Norfolk, for a story in the new August 2010 issue of CAR Magazine, out on 21 July. But how fast was he in the latest track-day tool of choice?If you can correctly guess Jethro's lap time, you could win this brilliant Suunto Elementum Ventus watch. It's worth £550 and is yours to keep if you come up with the nearest time to Jethro's fastest lap.The 260 Cup is a £45,950 slice of Lotus: a beefed-up, supercharged and super light at 890kg coupé version of the Elise, honed and fettled for track action.