Nurburgring Active Dyno | 2009 Porsche 911 Engine
2009 Porsche 911 Engine Running Simulated Nurburgring
http://www.youtube.com/watch?v=xS_aaUtPCMw
WEISSACH, GERMANY — Porsche has developed a novel test rig for engines that simulates the driving conditions of the Nürburgring Nordschleife. As a unique video reveals, the engineers at Porsche's research and development facility at Weissach created a movable engine dynamometer to reproduce the g-loads of a lap of the Nordschleife. Porsche has used this rig to develop an integrated dry-sump oiling system for the 2009 Porsche 911 Carrera and Carrera S.
In creating a new engine family that debuts in the 2009 Porsche 911 Carrera and Carrera S, the Porsche engineers took special measures to re-examine — and redesign, if necessary — essentially every subsystem of the new power plant. Part of the development process included taking another pass at the engine's innovative integrated dry-sump oiling system.
The basic integrated dry-sump concept that was introduced with the 996-model of the Porsche 911 has been retained for the new engine, but it's been augmented with a variable-flow pressure pump and several detail refinements. Previously, the engine's oil system development relied heavily on vehicle testing at the Nürburgring Nordschleife. The problem with track time on the 'Ring is that it is expensive, logistically intensive and subject to the whims of the weather.
As a result, Porsche created a unique engine dynamometer to supplement this track testing process.
We've seen (and built) test rigs before, but nothing quite like what we saw in Porsche's technical center at Weissach during the introduction of the 2009 Porsche 911 Carrera. The rig is programmed to simulate the forces that the engine would experience on the Nordschleife. Engineers measured the g-loads, engine speed and load of a 911 as it assaulted the track, and then fed the data into the computerized test rig. This device not only simulated the rise and fall of engine rpm, but also tipped, rolled and swiveled at top speed to match the G-forces encountered at the track, flinging the engine around like a dog with a chew toy.
The test rig is the unholy union of an engine dyno and a tilt-a-whirl. As far as we know, this is the first of its kind to be used by a major automaker.
At first blush, you might think this rig can simulate only 1.0g since it only has Earth's gravity providing the persuasion. But you'd only be partially right. Indeed, the steady-state limit that can be achieved in the rig is 1.0g, but due to the inertia of the oil inside the engine, transient maneuvers of up to 1.4g can be replicated.
What this means to you: It took Porsche engineers two years to develop the rig, and when you watch the video of it in action, it will become obvious why. Keep the sound turned up. — Jason Kavanagh, Engineering Editor
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