Rear Axle Steering

[W1NGE]

Doesn’t PSP just adjust the number of turns of the steering wheel lock-to-lock, whereas the RWS actual shortens the wheelbase (effectively) resulting in a tighter turning circle?

Not quite. Speed sensitive steering so gets firmer at speed and lighter at lower speed.

RAS will reduce turning circle by about 12".

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[ciaranob]

Not quite. Speed sensitive steering so gets firmer at speed and lighter at lower speed.

RAS will reduce turning circle by about 12".

FWIW, for me it is much more than simply the turning radius (despite my comments re u-turns )- RAS provides angles and approaches in tight maneuvering that you simply don't get w/o this option.

 

[Sidicks]

Not quite. Speed sensitive steering so gets firmer at speed and lighter at lower speed.

RAS will reduce turning circle by about 12".

Thanks for the clarification - I guess my point is that only RWS changes the effective wheelbase to give you a tighter turning circle.

 

[W1NGE]

Thanks for the clarification - I guess my point is that only RWS changes the effective wheelbase to give you a tighter turning circle.

Correct and dependent on which drive mode you are in the turn can be more pronounced e.g. Sport and Sport Plus but only at speed.

Note that it is not RWS but RAS (axle and not wheel).

 

[mas_gts]

I have one more question for those who have real life experience of RAS. Are there any downside to having it for typical, day to day, non-track usecase? I have heard others say that it can provide strange feel/effect from steering wheel etc. Any truth in that? Thanks!

 

[ciaranob]

I have one more question for those who have real life experience of RAS. Are there any downside to having it for typical, day to day, non-track usecase? I have heard others say that it can provide strange feel/effect from steering wheel etc. Any truth in that? Thanks!

Again limited and ongoing experience but honestly not at all - was curious to experience it but much more of an ‘add’ if you will than a detraction or negative experience. Again no regrets whatsoever so far!

 

[W1NGE]

I have one more question for those who have real life experience of RAS. Are there any downside to having it for typical, day to day, non-track usecase? I have heard others say that it can provide strange feel/effect from steering wheel etc. Any truth in that? Thanks!

No downside whatsoever - you won't notice it s there really.

 

[tbinmd]

Doesn’t PSP just adjust the number of turns of the steering wheel lock-to-lock, whereas the RWS actual shortens the wheelbase (effectively) resulting in a tighter turning circle?

Yes, PSP is just old lady steering. RWS give stability during high speed curves and tighter turns at parking speeds. Must have for me.

 

[W1NGE]

Yes, PSP is just old lady steering. RWS give stability during high speed curves and tighter turns at parking speeds. Must have for me.

Sorry, but your description is simply not completely accurate (funny maybe but accurate not) nor does the car have RWS (RAS = Rear Axle Steering). It's no accident that RAS is combined with PSP when optioned.

 

[f1eng]

RWS (RAS = Rear Axle Steering)

Surely two names for the same thing?

I can't either imagine or have ever seen a rear wheel steering system which didn't turn both wheels, including the one we tested at Benetton with Michael Schumacher.

 

[AHayat]

i was watching a Matt Watson review of the EQS AMG and you could really see the rear wheels turn on that so it’s strange that it would be visually imperceptible on the Taycan. Appreciate different systems but still…

Much higher degree of movement on the merc

 

[f1eng]

Much higher degree of movement on the merc

The Merc has 2 different amounts of rear steer available at different prices and/or for different markets. The greater one is pretty well purely for manoeuvring the very long wheelbase car.

The Taycan is more about handling and the better manoeuvrability is a bonus.

 

[Lars]

The Merc has 2 different amounts of rear steer available at different prices and/or for different markets. The greater one is pretty well purely for manoeuvring the very long wheelbase car.

The Taycan is more about handling and the better manoeuvrability is a bonus.

This shows it well - It is steering the wheel on the rear axle.

 

[ciaranob]

This shows it well - It is steering the wheel on the rear axle.

Thx for posting - excellent and exactly describes my experience (earlier in this thread) both in a tight U-Turn and in slow maneuvering - again, a truly worthy add imo.

 

[Sidicks]

Sorry, but your description is simply not completely accurate (funny maybe but accurate not) nor does the car have RWS (RAS = Rear Axle Steering). It's no accident that RAS is combined with PSP when optioned.

What do you think is the difference between rear wheel steer and rear axle steering? I’m sure the terms are used interchangeably?

Surely the point is that the rear wheels (axle) turn to either mirror the front wheels (to aid stability) or the opposite way (to increase agility).

On the GT3 there was RWS but not PSP - as far as I am aware they are entirely separate things for entirely separate purposes.

Indeed, I think you can have PSP without RWS on the Taycan, confirming the two systems are unrelated and independent.

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