Elephant Bart

In a post from last week, user 'skuplist' uploaded a video (link) of the rear axle steering action on a 991 Turbo. We've shot a comparison video using our GT3 and documented the actual mechanism in action.


The mechanism behind the rear steering action is an actuator that replaces the Track Rod (pictured below). Track rod is responsible for the toe alignment. Replacing the track rod with an actuator changes the toe dynamically.



for more angles of the rear suspension, please reference our suspension navigator (link)

The video is shot at idle. At this speed the movement is greatest and most visible. The rear wheel counter steer up to 50 miles per hour to create an effective wheelbase that is shorter, and making the car more maneuverable. Above 50 mph the wheel steer in the same direction for improved stability.

Enjoy.

neanicu

That's really cool to watch! You guys should get all the credit for doing this! This is the best video I've seen to date of how the system works!

skuplist

Yes very nice!

SamFromTX

Awesome, thanks. Can one still adjust rear toe?

997TTMeteor

Very cool - thanks!

Elephant Chuck

Yes. The inner connection of the actuator has the standard cam-type adjuster bolt for static toe. Not the best angle, but you can see it in the upper right corner of the vid at around 40 sec.

Serge944

Chuck, where's the high speed video demonstration? The rear wheels should turn the other way, right?

irish guitar

Thanks for posting; impressive demonstration and good knowledge.

Nan P

Thanks for posting.
I saw this same demo @ the local Porsche dealership on the GT3; yes it's very impressive & all the suspension/steering actuators look robust.

lordpantsington

THANK YOU! The suspension navigator is incredibly helpful.

alexb76

I am curious how does this changes the whole camber of the tires? what about under load? and how robust it is? Also, what sort of maintenance is required to make sure this works fine in the long run?

MarcusG

Man, that's a bitchen avatar pic of yours. Is it yours or a Porsche PR shot?

redleg321

Excellent work. That really helps as no one has visually demonstrated this.

By the way, how much does RWS weigh? I think AP stated it before but I forget.

911rox

That's a fantastic video demonstration of how the system works. Far greater movement than I expected to be honest. Thanx!

Just FYI, when the wheels were put back on, that rear CL locking pin wasn't fully engaged... It was only half way out.

rubber_ducky

Addressed in the first post