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Porsche Cayenne gets more power

Porsche Cayenne Turbo - Powerkit adds 40bhp A lack of power is not something you would normally complain about with the Porsche Cayenne Turbo. After all, despite weighing roughly the same as a grouse moor (unlike the previous generation which weighed slightly more than a small moon), it’s 500bhp V8 moves this SUV to 60mph in a chunk less than 5 seconds. But power under the bonnet is addictive, and even if you have 500bhp under your right foot there will always be occasions when you wish you had just that bit more.

California looks to tighten pollution limits

The California Air Resources Board is scheduled to vote on Thursday on whether to adopt stricter clean-air standards for the state proposed by the Advanced Clean Car program. The program's proposal combines the control of soot, smog-causing pollutants and greenhouse-gas emissions into a package that may be required for model years 2017 through 2025. According to the program, the rules aim to clean up conventionally powered cars, deliver more zero-emissions cars and ensure that a fueling infrastructure is available.

Porsche 911 GT3 R Hybrid (2011) first official pictures

Porsche has released details of its updated 911 GT3 R Hybrid – the 2010 original nearly won last year's Nurburgring 24hr race before (ironically) it retired with petrol engine failure.  The 2011 Porsche 911 GT3 R Hybrid – the lowdown Before this report disappears in a chorus of ‘it looks the same as last year’s one’, let's outline where Porsche’s engineers have been busy. At the unfashionable end of the car remains a 4.0-litre flat-six engine producing approximately 470bhp. Up front are twin electric motors, now producing 75kW of power each (up from 60kW) and combined these give the GT3 R Hybrid a 197bhp electric boost, which can be programmed to activate automatically via the throttle pedal, or manually selected during overtaking. F1-derived hybrid tech for the 911 GT3 R Hybrid Power for the two electric motors doesn't come from batteries, but flywheel accumulator technology from Williams Hybrid Power, an offshoot of the Williams Formula 1 team. The flywheel, encased in a carbonfibre safety cell in the space where the passenger seat would be, spins at up to 40,000rpm and acts as a mechanical energy store for the electric motors. Regenerative braking feeds energy back into the flywheel system – no surprises there, as the technology is derived from Williams' exeprience with Kinetic Energy Recovery Systems (KERS) in F1.