Turning radius update to come! Extra 7 degrees of steering angle for rear wheel steering (from 3 to 10 degrees)

[RadoRage]

Anyone think of a reason to have a RWS "off" feature? aka for certain performance or off-roading situations?

Yes, in certain situations RWS should be turned off, so my guess is that there will be a selection for it. In GM Quadrasteer trucks, it was recommended to turn off when entering an automatic pull-through car wash for example. Another example could be extreme weather (heavy snow or rain).

BTW, RWS is actually pretty helpful when off-roading.

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[RadoRage]

Very happy to hear about this news, as I was very surprised at the initial 3 degrees of rear steering at release.

What I am really looking forward to is seeing updated turning radius/circle measurements with the updated 10 degrees. Just for reference, the GM Quadrasteer trucks had up to 15 degree rear steering (12 in tow mode) and the turning circle was only 37.4 feet! ...I miss my old truck

 

[vertigo3pc]

I actually think this is something that delayed AP and FSD in the CT, and once it's fixed, we'll see progress with AP.

 

[GuyV]

Anyone else find it strange that something like a turning radius is still being adjusted at this stage of production?

Not with Tesla ?

 

[PilotPete]

And it is quite feasible that if FSD is in control, at least for now, variable steering isn't even turned on.

And if they turn variable steering off while FSD is in charge, it does exactly like the other vehicles.

Yes, in certain situations RWS should be turned off, so my guess is that there will be a selection for it. In GM Quadrasteer trucks, it was recommended to turn off when entering an automatic pull-through car wash for example. Another example could be extreme weather (heavy snow or rain).

BTW, RWS is actually pretty helpful when off-roading.

One thing worth remembering, RWS isn't just so you can make tight turns. At freeway speeds, the rears turn in the same direction as the fronts. The purpose for this is improved stability, and lower chance of a loss of control accident (when compared to FWS only cars). More advantages when towing. So you really don't want to just "turn it off" when driving. And FSD could benefit from FSD on many levels.

 

[GuyV]

Hey @Dazajj, you planning on driving your CT when you get it or just pose and fondle?

Can't speak for the other FS soon to be owners but I know I will be driving the heck out of mine when delivered in Feb/March

For me that would depend on whether I get stuck with some free supercharging instead of Powershare installation. Could be some long road trips this year.

 

[Pops]

The back does swing out, even at smaller angles than the front. This was a problem even in the early days of 4WS and documented in owner's manuals, too.

It turns out @Sirfun already pointed this out back in 2021 (including suggesting using Tesla Vision to adjust for it): (1) All wheel steering - how does it work? Check out the Honda Prelude 4WS video he posted (it had this problem with only 1.5 degrees of opposite-phase rear steer):

Check out this video of the Hummer EV making a circle with rear wheel steering. Notice the rear corner of the vehicle never goes out farther than the front wheel ground trail. So the rear swinging out is not a problem with all rear wheel steering vehicles. I guess it matters how much vehicle is overhanging the rear wheels.

@ 4:34 minutes into the video, if the link doesnt automatically take you there.

 

[Eddyrelik]

I'm pretty sure Tesla can determine of any obstructions in view and adjust the streering angle in the rear....in future interations....

 

[Jow]

no. Just different

WHOOSH

 

[Johne-bike]

Anyone else find it strange that something like a turning radius is still being adjusted at this stage of production?

It's not just the turning circle that is affected by a change of rear geometry from 3° to 10°
The entire steering response will alter as the truck is Steer by Wire and will require quite an alteration to the steering algorithm to ensure the extra rear wheel steering angle at low speed full lock interacts smoothly and progressively at reducing the rear wheel angle at higher speeds, at could even incorporate front and rear steering in the same direction for smooth high speed lane change/swerve manoeuvres.
This requires careful calibration to ensure the responsiveness of the steering meets a whole spectrum of driver needs with smooth, seamless transitions from low speed to higher speed driving conditions..
These alterations are much better carried out in early production where Tesla can easily monitor customer feedback regarding the increased responsiveness of the steering..because customers may well have a different reaction to the changes compared to factory development drivers!

 

[RadoRage]

One thing worth remembering, RWS isn't just so you can make tight turns. At freeway speeds, the rears turn in the same direction as the fronts. The purpose for this is improved stability, and lower chance of a loss of control accident (when compared to FWS only cars). More advantages when towing. So you really don't want to just "turn it off" when driving. And FSD could benefit from FSD on many levels.

Yep, owned my Quadrasteer for 10+ years and only turned it off a handful of times. Amazing feature in a truck for those that don't know or understand it's benefits.

 

[cvalue13]

The rear end obviously was designed with a greater turn angle in mind.

it actually wasnt

this is an 11th hour change by guess who

 

[cvalue13]

If you need hundreds of thousands of miles I am confused on why you would need hundreds of thousands of Cybertrucks on the road to gather that many miles?

range ?

 

[Coolbreeze704]

range ?

At 1 mile a piece?

 

[PilotPete]

it actually wasnt

this is an 11th hour change by guess who

You and I are saying different things. I think you are talking original design. What I am saying is the “hardware” is capable of 10 degrees and so the software is key to opening the ability when they are ready. Regardless of when the change was made to the physical pieces and parts, it left the factory with the capability. The opposite of my point would be that the bushings and wheel well only support 3 degrees and if you take it in to the service center, they will swap stuff out and give you 10 degrees. Sound better?

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