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I need help with understanding and identifying the Model S drive units . The EV Controls T-1C has capability to control model s dual motor. However it would have to be P85D , P90D, or P100D rear drive unit coupled with front.

Are large rear drive units only in the P85D P90D P100D and all others (rwd or awd) use a small rear drive unit ?
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  • A rear-wheel-drive Model S has a just large rear drive unit,
  • a non-performance AWD (called "Dual Motor" and indicated by "D" on the end of the designation, but no "P" in front) has a small front and a small rear drive unit, and
  • a Performance AWD (indicated by a "P" on the front of the designation, plus the usual "D" on the end) has a small front and large rear drive unit.

There is no 2WD Model S with a small drive unit.
 

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That is what I was not sure about is that a rwd model s can have a large rear motor.
A RWD not just "can have", but "always has" a large motor.

Do you know how I can identify if a large motor is from a rwd model s or from a Performance D ? (Without knowing the donor car VIN)

Is there a way to identify via the drive units part number or serial number ?
I have no idea. Whether the drive unit came from a PxxD or a RWD car doesn't matter to the motor or transaxle. If it matters to EV Controls, it's probably a matter of controller programming; I don't know if there's a way to check that.
 

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You are majorly confused with the "D" which has nothing to do with a P car's rear drive unit.
As explained above, "D" means dual-motor, which is Tesla-speak for AWD. Adding the Performance option ("P") to a Dual-motor changes the rear motor from small to large.

The Performance cars will have "sport" on a paper sticker on the inverter case. Otherwise, there's no easy way to tell without a serious teardown of the drive unit.
It doesn't take a teardown, or even any tools, to see the obvious difference between the large drive unit in a PxxD and non-P xxD Model S. This is the illustration provided by Tesla (from an enthusiast site, because from Tesla it had to assembled from multiple pages as build options were explored in the online configuration tool).



Distinguishing P and non-P rear drive units from RWD cars is another matter entirely, as they are all large drive units. As already noted:
Whether the drive unit came from a PxxD or a RWD car doesn't matter to the motor or transaxle. If it matters to EV Controls, it's probably a matter of controller programming; I don't know if there's a way to check that.
Since there were P and non-P RWD cars, and they had the same motor, there is presumably a difference in at least controller programming.
 
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