4 Wheel Steering advantage demonstrated (turning radius - ON vs. OFF)

[Spuzzz]

I have not seen where you can turn off 4WS ...
this may have just been done thru engineering temporarily?

Yeah me either just looked for it today and couldn’t find it.

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[scottf200]

Yeah me either just looked for it today and couldn’t find it.

It was clarified after that. See this post:
https://www.cybertruckownersclub.co...d-turning-radius-on-vs-off.31250/#post-548981

 

[GuyV]

I wonder how this compares to 4WS on the

• GMC Sierra EV Denali
• Chevrolet Silverado EV

CTs was 3 degree, then 7 but supposed to be 10?
I don't think I've read what the Sierra EV or Silverado EV are at.

I am hoping we get to 10 because I can almost but not quite make a full curb-to-curb U-turn in my street which I am able to do in my old Model S.

 

[DJAlan2000]

I think they should make a comparison of the CT against the model y! I feel like the CT turns tighter circles than my Model YLR does... THAT would make a great video!

If only I could figure out how to use that cheapy drone I got for my birthday... hehe...

 

[RadoRage]

I wonder how this compares to 4WS on the

• GMC Sierra EV Denali
• Chevrolet Silverado EV

CTs was 3 degree, then 7 but supposed to be 10?
I don't think I've read what the Sierra EV or Silverado EV are at.

I would love to hear when Tesla is planning on going to 10°. Rear wheel steering was one of the biggest features I was happy to see added to the Cybertruck, but sad to see the lower 3°/7° numbers.

For reference, my Quadrasteer had a maximum of 15° of rear steer.

 

[Jack27]

Nice write up. I’ve been driving grade alls for years so I’m use to 4 wheel steering , the CT does make some crazy noises though

 

[HaulingAss]

I would love to hear when Tesla is planning on going to 10°. Rear wheel steering was one of the biggest features I was happy to see added to the Cybertruck, but sad to see the lower 3°/7° numbers.

For reference, my Quadrasteer had a maximum of 15° of rear steer.

You will find that Cybertrucks combination of rear steer with steer by wire will make the Cybertruck outperform Quadrasteer at manuevering in tight spaces, even if it does have more articulation of the rear wheels.

You really have to drive it off-road or in tightly constricted spaces to fully understand how this is possible. Even if the GMC with Quadrasteer had a slightly tighter turning radius, the manueverability of the Steer-by-Wire more than makes up for it by allowing you to get the wheels to full lock almost instantly, rather than laboriously turning lock-to-lock in a GMC while moving at a very slow ground speed.

The Cybertruck makes you feel like you are manuevering the most manueverable truck in the world. It makes tiny trucks like the Toyota SR5 feel cumbersome. After becoming accustomed to the Cybertruck, even my wifes brand new Model 3 Performance feels cumbersome while manuevering around our driveway and the adjacent street. I have to drive slower, way slower, so I can spin the wheel around multiple times without covering too much ground.

 

[RadoRage]

You will find that Cybertrucks combination of rear steer with steer by wire will make the Cybertruck outperform Quadrasteer at manuevering in tight spaces, even if it does have more articulation of the rear wheels.

You really have to drive it off-road or in tightly constricted spaces to fully understand how this is possible. Even if the GMC with Quadrasteer had a slightly tighter turning radius, the manueverability of the Steer-by-Wire more than makes up for it by allowing you to get the wheels to full lock almost instantly, rather than laboriously turning lock-to-lock in a GMC while moving at a very slow ground speed.

The Cybertruck makes you feel like you are manuevering the most manueverable truck in the world. It makes tiny trucks like the Toyota SR5 feel cumbersome. After becoming accustomed to the Cybertruck, even my wifes brand new Model 3 Performance feels cumbersome while manuevering around our driveway and the adjacent street. I have to drive slower, way slower, so I can spin the wheel around multiple times without covering too much ground.

I completely understand how both steering systems work, and the advantages of steer by wire in their application. But having driven both...no, the Cybertruck does NOT outperform maneuvering in tight spaces.
- Full-size Silverado or Sierra: With Quadrasteer, these trucks can turn in a 36.5 ft radius.
- Cybertruck turning Circle (curb to curb), Approximately 43.5 ft

What I'm saying is that the Cybertruck can do better. If they were able to increase the rear steering maximum turning operation to 10 degrees (or more), that combined with the steer by wire, that it would clearly be on top.

 

[scottf200]

- Full-size Silverado or Sierra: With Quadrasteer, these trucks can turn in a 36.5 ft radius.
- Cybertruck turning Circle (curb to curb), Approximately 43.5 ft

FYI, that it is closer to 40' 3" -- @T Sportline video with measurements below

 

[HaulingAss]

I completely understand how both steering systems work, and the advantages of steer by wire in their application. But having driven both...no, the Cybertruck does NOT outperform maneuvering in tight spaces.
- Full-size Silverado or Sierra: With Quadrasteer, these trucks can turn in a 36.5 ft radius.
- Cybertruck turning Circle (curb to curb), Approximately 43.5 ft

What I'm saying is that the Cybertruck can do better. If they were able to increase the rear steering maximum turning operation to 10 degrees (or more), that combined with the steer by wire, that it would clearly be on top.

The 43.5 ft. Cybertruck turning circle is an outdated figure from nearly a year ago (before Tesla significantly tightened the turning circle by increasing the rear steering angle). The Silverado EV still has a tighter turning circle, but it's harder to put it to use.

Steering systems without steer by wire have used traditionally used a parallelogram steering linkage arrangement. One disadvantage of this arrangement is that, due to the angles involved of the pitman arm and idler arm at sharp turning radii, the steering ratio decreases as the wheels approach the steering stops. In other words, the tighter the wheels are turned, the more you have to turn the steering wheel to turn the wheels a given amount.

Cybertruck's steer by wire actually works in reverse, making it very easy to use the last bit of steering angle without having to bring the truck to a stop as you make a full transition from left to right as you maneuver through a constricted situation that requires maximum turn angles in both directions.

 

[RadoRage]

The 43.5 ft. Cybertruck turning circle is an outdated figure from nearly a year ago (before Tesla significantly tightened the turning circle by increasing the rear steering angle). The Silverado EV still has a tighter turning circle, but it's harder to put it to use.

Steering systems without steer by wire have used traditionally used a parallelogram steering linkage arrangement. One disadvantage of this arrangement is that, due to the angles involved of the pitman arm and idler arm at sharp turning radii, the steering ratio decreases as the wheels approach the steering stops. In other words, the tighter the wheels are turned, the more you have to turn the steering wheel to turn the wheels a given amount.

Cybertruck's steer by wire actually works in reverse, making it very easy to use the last bit of steering angle without having to bring the truck to a stop as you make a full transition from left to right as you maneuver through a constricted situation that requires maximum turn angles in both directions.

I'm not talking about Silverado EV 4 wheel steering... talking about the GM Quadrasteer system (2002-2007). Completely different system.

The 43.5 turning circle figure was directly from the current Cybertruck manual: https://www.tesla.com/ownersmanual/cybertruck/en_us/GUID-32CD64C8-5661-45A8-BFB6-35603858F7FB.html

 

[HaulingAss]

The 43.5 turning circle figure was directly from the current Cybertruck manual: https://www.tesla.com/ownersmanual/cybertruck/en_us/GUID-32CD64C8-5661-45A8-BFB6-35603858F7FB.html

Tesla hasn't updated the Owner's Manual from the original turning radius from back in January. And to be clear, I'm not saying the Cybertruck has a tighter turning radius than your old Quadrasteer vehicle, I'm saying the variable steering ration of Steer-By-Wire makes the Cybertruck more maneuverable at low speeds.

 

[HaulingAss]

Another interesting fact:

Tesla has already sold more 4 wheel steering units with one model (Cybertruck) than all the Quadrasteer vehicles sold over the four years that GM offered it on four different models (Silverado, Sierra, Suburban, Yukon). Probably more than twice as many.

They even lowered the price of the option to only $1000 to boost sales but ended up writing it off as a failure.

Do you wonder why GM didn't use the Quadrasteer trademark on their EVs with Four-Wheel-Steering? Probably because Quadrasteer was developed by Delphi, not GM, which is owned by BorgWarner.

 

[scottf200]

The 43.5 turning circle figure was directly from the current Cybertruck manual: https://www.tesla.com/ownersmanual/cybertruck/en_us/GUID-32CD64C8-5661-45A8-BFB6-35603858F7FB.html

That is wild because the video clearly shows it was way less. 3 feet is substantial.

 

[scottf200]

FYI, that it is closer to 40' 3" -- @T Sportline video with measurements below

Saw this GMC Sierra Denali w/4WS (37.4 feet) diagram from another thread post I had.

Image above via:
General Motors Quadrasteer Technology
https://gmauthority.com/blog/gm/gen...chassis-suspension-technology/gm-quadrasteer/

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