RAS has no effect between 37 - 50 mph?

[Tay Tay]

Below 37, wheels move in opposite direction. Above 50, they move in same direction. In between they don’t move at all. That’s on 911s, anyone know if it’s the same case for Taycans? If so RAS doesn’t seem helpful from a street performance perspective because that’s exactly the speed range I’d be talking corners at on the street. Am I missing something? Maybe the different, more direct, steering rack is still helpful?

Sponsored

 

[Gubbjaevel]

There should be no time when the RAS is not working...

From Porsche:

Rear axle steering: maximum steering precision and easier manoeuvring​

Rear-axle steering is available as an option (standard in the Taycan Turbo S). This further increases comfort, driving safety and driving dynamics. The vehicle steers without delay and builds up lateral acceleration at the rear axle much sooner. The result is even more impressive steering precision.​

​

At low speeds of up to about 50 km/h, the rear wheels steer in the opposite direction to the front wheels. The steering angle depends on the driving speed and is a maximum of 2.8 degrees. This virtual shortening of the wheelbase results in a more dynamic steering response when cornering. At the same time, manoeuvring is easier as the turning circle has been reduced by around 60 centimetres to 11.2 metres. In addition, with rear-axle steering, the Taycan automatically features Power Steering Plus with greater support for steering assistance at low speeds.​

​

At speeds exceeding approximately 50 km/h, the rear wheels steer in the same direction as the front axle, again depending on the speed. The wheelbase is therefore virtually lengthened, thereby increasing stability, for example when changing lanes on the motorway.​

 

[Tay Tay]

Thanks for replying. There is a lot of conflicting information though. This is also from Porsche:

"Between 50 and 80 km/h the steering direction is constantly changing depending on the driving conditions."
http://webcache.googleusercontent.c...ring&client=opera&hl=en&gl=us&strip=1&vwsrc=0

That's from the 911 but would it really be different for the Taycan? That description sounds more sensible than the one for the Taycan, where always above 50 kph it will steer in the same direction. Then there's this:

"37mph-50mph band:
RAS keeps tracking straight inside this speed band, so it does not make any difference at all."
https://rennlist.com/forums/991/978739-some-notes-on-ras-rear-active-steering.html

Anyone can post anything on a message board, but the rest of the information tracks, so it seems believable.

Also I know it doesn't weigh much, but does anyone know if it's unsprung weight?

Sponsored