cwerdna
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Re: Official Tesla Model Y Thread

Sun Jul 26, 2020 5:11 pm

GRA wrote:
Sun Jul 26, 2020 5:07 pm
C&D:
Tested: 2020 Tesla Model Y Long Range Crosses Over Into the Mainstream

https://www-caranddriver-com.cdn.amppro ... numbers%2F


Somewhat tepid review.
Thanks. https://www.caranddriver.com/reviews/a3 ... e-numbers/ is formatted better.

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Re: Official Tesla Model Y Thread

Tue Jul 28, 2020 7:19 pm

cwerdna wrote:
Sun Jul 26, 2020 5:11 pm

Thanks. https://www.caranddriver.com/reviews/a3 ... e-numbers/ is formatted better.

BTW, that's the second Mod Y review I've read that says the steering's too quick. 2 turns lock-to-lock for a top-heavy CUV makes no sense: 2.5 - 3 would seem to be more reasonable.
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Re: Official Tesla Model Y Thread

Tue Jul 28, 2020 8:32 pm

I'll bet it uses the same steering rack as the Model 3.
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Re: Official Tesla Model Y Thread

Tue Jul 28, 2020 10:26 pm

LeftieBiker wrote:
Tue Jul 28, 2020 8:32 pm
I'll bet it uses the same steering rack as the Model 3.

That's the implication. It's apparently the same turns lock to lock. The reviews I've read indicate it's okay for the lower and more agile 3, but not the Y. I'll try to find the other review that mentioned it. It wasn't on one of the usual sites, and I don't recall where it was.

Edit: I take it back, it was ABG:
One performance caveat. I love quick steering racks, but the Tesla’s is just too quick for a family-friendly SUV, at two full revolutions from lock-to-lock. Especially at rocketing speeds, the Model Y will overshoot your steering target if you’re not careful, requiring extra concentration to place accurately in its lane. Knowing Tesla, that issue could be fixed with the flip of an over-the-air software switch — another area where legacy automakers are still playing catch-up.

https://www-autoblog-com.cdn.ampproject ... t-drive%2F


I don't see how an over the air update could change the steering ratio. They might be able to adjust the assist. He also writes:
The steering transmits precious little road feel, but you quickly learn to trust the Model Y, which can corner at speeds that will confound the typical SUV family.

He may be willing to trust it, but I hate cars with steering like that - I almost rolled my dad's '87 Legend once while cruising down the freeway (I was drifting into microsleep, jerked awake, made a quick tug to get it back centered in the lane and felt it start to go up on two wheels. After recovering it I got off at the next exit to nap). The cause of the near roll was its quick steering, over assistance and lack of feel and feedback. Never would have happened in a car with better steering qualities, not that that excuses me from continuing to drive while that tired. It was a salutary lesson, and I've never done so since.

Those elements of driving dynamics rank very high with me when choosing a car. I want be able to feel what's happening at the wheels, especially when driving on snow and ice. I normally drive fingertips-only in those conditions, just so I can feel as early as possible when the tires are losing adhesion. But you've got to have steering with good feel and feedback to do that.
Last edited by GRA on Wed Jul 29, 2020 5:17 pm, edited 1 time in total.
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Re: Official Tesla Model Y Thread

Wed Jul 29, 2020 7:50 am

LeftieBiker wrote:
Tue Jul 28, 2020 8:32 pm
I'll bet it uses the same steering rack as the Model 3.
Remember that most all vehicles presently are "drive-by-wire", which means that there's no mechanical connection from the steering
wheel to the steering rack. The system uses an ECU to drive a motor with feedback to control the ratio. This can provide for various
steering ratios, e.g. a sport mode.
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Re: Official Tesla Model Y Thread

Wed Jul 29, 2020 9:09 am

GRA wrote:
Tue Jul 28, 2020 7:19 pm


BTW, that's the second Mod Y review I've read that says the steering's too quick. 2 turns lock-to-lock for a top-heavy CUV makes no sense: 2.5 - 3 would seem to be more reasonable.
CUVs may be top-heavy in general but with the battery under the floor that isn't the case for most EVs, especially Teslas. The higher seating position may make drivers used to regular top-heavy CUVs feel uncomfortable but once they get used to the very low CG they may become accustomed to the flat EV handling on curves.
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Re: Official Tesla Model Y Thread

Wed Jul 29, 2020 9:30 am

lorenfb wrote:
Wed Jul 29, 2020 7:50 am
LeftieBiker wrote:
Tue Jul 28, 2020 8:32 pm
I'll bet it uses the same steering rack as the Model 3.
Remember that most all vehicles presently are "drive-by-wire", which means that there's no mechanical connection from the steering
wheel to the steering rack. The system uses an ECU to drive a motor with feedback to control the ratio. This can provide for various
steering ratios, e.g. a sport mode.
https://en.wikipedia.org/wiki/Drive_by_ ... er_by_wire
The first production vehicle to implement this was the Infiniti Q50., but after negative comments they retrofitted the traditional hydraulic steering.
Is there any production car today that is steer by wire?
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Re: Official Tesla Model Y Thread

Wed Jul 29, 2020 10:33 am

Hmmm. Not sure. Open the hood and inspect the firewall. Do you see any mechanical linkage running back to the steering wheel like in cars of old?

In the case of our SL+, I can't tell, as there's plastic cladding around *something* in line with the steering and above the steering rack. I'm guessing that's where the power steering motor lives, and it could be mechanically linked back to the steering wheel.

In the case of my 2015 Q5, color me skeptical. Again there is cladding around that area, but the top of the front strut is in line with the steering wheel axis and positioned aft of the axle, putting it very much in the way of any mechanical linkage from what I can see.

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Re: Official Tesla Model Y Thread

Wed Jul 29, 2020 1:10 pm

Drive by wire means 'accelerator pedal to speed control' to me, not steering or braking or anything else. I'd be surprised if any production cars don't have a direct mechanical link between the steering wheel and the tie rod ends. I'd also be surprised if there were any that didn't have a direct hydraulic link between the brake pedal and the calipers.

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Re: Official Tesla Model Y Thread

Wed Jul 29, 2020 1:16 pm

The easiest way to check would be to turn the steering wheel with the car completely Off. There should be enough play in the steering lock to feel if you are turning a mechanical system or not. I too would be surprised to find a 'steer by wire' system.
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