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Upgrading AWD
- Thread starter Nb1277
- Start date
They use the same Motors, but not the same inverters exactly. Silicon carbide inverter on performance model are hand picked, longer burnin . I'm sure after thousands of hours of reliability testing they may allow an uncorking like they did on the S75D for normal AWD
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Yes. To be precise, the P and AWD inverters are probably the same part number, except that the P inverters are the best of the best from a given lot of parts.
AWD does not use silicon carbide inverter, why would they use more expensive part for regular AWD?
I think they would use the same part to avoid even more expense due to: 1) Switching costs on the production line to install a different part, 2) Cost to manage another part in the supply chain, 3) Cost to support another part in the finished product. Did you have a different read on Elon’s tweet?
There's already existing inverter for the RWD, Tesla can just use that? Why does a regular AWD need Silicon Carbide inverter?
Elon is clearly talking about Performance Model having Silicon Carbide Inverter in Front and Back.
The S as a whole will likely be improved. If they can't make it faster they will have to give it better interior, better toys, etc.
The 3 at any trim level is too much range, too much performance for much less money than the S.
Daniel in SD
(supervised)
Why does the performance need a special inverter? That's the real question. It makes no sense that it would need one if it is just 50% more powerful. All you need to do is just add a motor in the front and use the same rear motor and controller.
This is true but CPUs have nanometer feature size. Is there really much variation in power transistors? I doubt it.
Not according to Elon Musk and the engineering team thus why they are using Silicon Carbide inverter for the Performance Model 3? or are you doubting Tesla design team's decision?
Both the AWD and Performance models have the same inverters and motors per Elon's tweet.
What if all the motors are really good from prosucprod and there is no real variation between the AWD and the performance motors?
I already quoted Elon's tweet couple posts above, he was answering question on the performance not AWD
I don’t know. Maybe the current demand of the additional motor exceeds the capability of the “regular” inverter.
That's not how I read his tweet. He said the drive units are hand picked for highest sigma for the performance version.
Drive unit to me is both the motor and inverter.
Someone needs to ask him again to clarify because I thing the consensus is that both the AWD and Performance have the same units
Because on the earlier main tweet from Elon he talks about getting the configurator ready for AWD and performance
It's twitter so everything is speculation, but you can interpret his sentences in two ways.
1) All three sentences are directly answering the question from Ryan about Performance. Evidence for this is because his next post lists additional items that are definitely exclusive to Performance. I.e. seems to be a continuation of the tweet about performance.
2) The first and second sentence is continuing his earlier post listing general things about "Working on dual motor AWD & Performance versions..." while the third sentence alone is answering the question from Ryan. Evidence for this is that he specifically calls out Performance in the third sentence but not in the first and second. I.e. seems to be two separate "thoughts" in one tweet.
IMO, doesn't matter. Even if motors and inverters are the "same", Tesla could offer a software upgrade from AWD to P, but it either won't or it'll be so expensive it wouldn't make any sense to do it. At most, Tesla might uncork the AWD a little more down the road, maybe 0.1 or 0.2 seconds quicker. But don't expect a free or cheap upgrade from AWD to P.
Knightshade
Well-Known Member
Nope
Elon Musk said:
The AWD and Performance use the same drive unit (which is motor and inverter)
If they didn't his second sentence wouldn't make any sense at all.
What would they be "sorting" if the actual unit wasn't the same part as the AWD?
Daniel in SD
(supervised)
Not exactly. I think all Model 3s have silicon carbide inverters. They're the most efficient power transistors. I'm questioning whether the rear drive unit actually has more power in the performance Model 3.
I think you are probably correct but the sorting could be of LR Model 3 drive units. That's what they did for the S, they added a smaller motor up front and kept the larger rear motor of the RWD version. Then for regular D they used the new smaller motor in the back as well.
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