Thanks. It appears that AWD combined with the advanced "digital" traction control systems are able to control the torque so well that they make ECO tires a non-issue for traction on this car. It is quite amazing actually that you can have over 450lb ft of instant torque and not even screech the tires.
When compared to traditional torque management systems on ICE cars where you have to retard timing and use other mechanical methods to control wheel slip the tires size and compound becomes so much more important to get traction.
Well it's an interesting question as to whether or not in fact traction control is actually being applied to launch or whether the system simply doesn't have the requisite torque to spin Michelin PS4s. It's pretty clear that in snowy and very slippery conditions traction control is on and being applied, but the speculation has been that the rear motor which has a switched reluctance/permanent magnet system with vulnerability to torque ripple may not either have adequate torque at super low RPM to spin the tires (unlike the induction motors on the Model S) or whether there is some kind of basic current reduction being applied at low rpm. Ludicrous mode appears to apply some kind of battery heating to maximize potential current to the inverters. Model 3 does not have that. So it appears that the Model 3 has both a different drive system that may not create as much low rpm torque, as well as a cost-saving deletion around ludicrous mode. One would think that the latter is just a software issue, and you have to wonder if the preconditioning of the battery while you're on the way to the supercharger could serve the same purpose, but nobody has shown that that type of preconditioning actually improves launch torque or 0 to 60 times.
Bottom line – we're still kind of in the dark about why the Model 3 can't launch with the same or at least closer to an approximation of the same force as the Model S. It's probably a combination of factors including the difference between Induction versus switched reluctance, current limitations on the inverters in the M3, and perhaps even a deliberate limiting of launch torque by Tesla to maintain a gap between its flagship and the Model 3.
Your guess is as good as mine – we just don't know.
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