Whomever they called was misinformed. The 20" wheel has the same outer diameter and circumference as both the 19" and 18" once tires are installed. The increased top speed is likely just a software unlock to allow full rpm of the motors.
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Performance Package on Performance Model
- Thread starter robt_sf
- Start date
@Garlan Garner
The 20 inch tires might be W speed rated (168 MPH) vs V (149 MPH) for the 18s...
https://www.tirerack.com/tires/tiretech/techpage.jsp?techid=35
There is no such thing as a "full rpm of (electric) motor".
It will rotate with the frequency the inverter creates. Inverter will create what computer demands.
Of course, as long as wires don't melt, rotors don't do Rapid Unscheduled Disassembly and bearings do not suddenly decide to seize up.
At high rpm such things tend to start to happen, also such things which accelerate wear and tear on mechanical components increasing the risk of failure.
Increased risk of failure means higher count of failed units and higher warranty costs.
Tesla bins their motors to find exceptionally stable units that have lower vibrations and can be pushed to higher frequency without drastically lowerinh their lifetime. It is still lower hence a bit higher warranty reservations.
18's are still W rated.
Full RPM of rear motor is 17900 RPM. Check the manual.
Garlan Garner
Banned
I called myself and I was assured its not a software limited thing. the diameter of the 20 inch combination of rim and rubber is 5/8 of an inch larger.
Garlan Garner
Banned
Just call Tesla. Don't call a sales rep.
The sales rep I saw last week tried to put the tow hook in the frunk where the clips to hold the groceries bags were.....and told me it was for something crazy....I didn't even listen because it was sooooo embarrassing.
Garlan Garner
Banned
You don't want 17900 RPM on the front wheel of this thing. Maybe the rear wheel.
My point - Tire diameter matters. LOL
Garlan Garner
Banned
Its not dependent on math. Not all rubber has the same sidewall height.
You can have an 18 inch rim with a 5 in sidewall or a 3 inch sidewall. What tire and sidewall height is Tesla using on each of their tires.
Here are some twenty something inch rims. Tire sidewall height matters.
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Those are the exact tire specs pulled from the Model 3 Owner's Manual.
Even if the 20's were somehow 5/8" larger in diameter as you said, the top speed would only increase ~2.2% from 145mph to 148mph.
Garlan Garner
Banned
That's not what Tesla is saying.
Call them and tell them that they are wrong. Let us know how that turns out.
Garlan Garner
Banned
JADCa
Member
if you look at the pictures with the 18s ordered you see black calipers if you order the 20 inch package you see much larger red calipers
I would like to know as well what changes from AWD to P other than faster 0-60.
Because from LR to AWD you are getting a motor and an improvement in 0-60mph of 0.6 sec per Tesla for $4,000.
From AWD to P for you get and improvement of 1sec in the 0-60 for $11,000 and what else do we get?
Knightshade
Well-Known Member
The aspect ratio in the tire spec literally tells you the sidewall height as a ratio. That's what the number means.
How To Read Tire Sizes | Goodyear Auto Service
Goodyear on how to read tire specs said:
Whoever you spoke to at Tesla is wrong (which happens reasonably often), the previous posters math is accurate.[/QUOTE][/QUOTE]
Garlan Garner
Banned
[/QUOTE][/QUOTE]
I don't have a problem knowing or reading the tire size. Its kindergarten math.
My 1st question is: What makes the 10 MPH difference? - Even though - I will never test it or use it.
My 2nd ( and much more important ) question is: Will the difference it tires affect my 0-60 times? Keeping in mind that there might be other changes that accompany the 20" tires. Tesla hasn't been entirely clear as to what comes in the Performance Upgrade package on the Performance Model 3.
Knightshade
Well-Known Member
Then your previous claims of "Its not dependent on math" and that we "don't know" the sidewall size make even less sense.
it's exactly dependent on math- as far as tire sizes go. And the tire specs tell us the sidewalls.
Which is why the explanation you got from the Tesla person made so little sense.
At this point, since both tires are rated for speeds over 155, there's only 2 possible explanations-
1) It's just a software unlock (more likely)
2) There's some bizarre instability that only happens above 145 mph that is fixed by the spoiler included in the "performance" pack (this is exceedingly unlikely- but is the only, relevant, mechanical difference we know of between the 18"P and the 20"P)
Given both versions list the same 0-60 spec, obviously not.
Garlan Garner
Banned
If you want to argue? - Aint gonna happen.
Called Tesla as they just told me .5 hours ago that there are no software limits on any Performance versions.
Please share with us what they tell you.
Tesla / Elon and the crew obviously don't know what they are talking about.
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