I don't know why it would have to do that. At 65mph cruise you're using 25-30 hp - which is nothing for the front motor.
Maybe the greater friction losses in the rear gear motor have something to do with it?
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I don't know why it would have to do that. At 65mph cruise you're using 25-30 hp - which is nothing for the front motor.
Maybe the greater friction losses in the rear gear motor have something to do with it?
Now, where do I get my robes and book of chants?
You can leave a deposit with me. Delivery expected sometime end of Q1, more likely Q2, maybe. Can't guarantee the robes will fit and that the chants won't get better after that. :-D
Was wondering that too. If the rear motor is sleeping, then the only difference between the 85D and the P85D is the front motor (188hp vs 221hp). Is the 221hp version less efficient at higher highway speeds than the 188hp version?
majorlance
Member
One reason for the decreased performance of the P85D at higher speeds could be that it weighs more than a standard D. The differences shown in the graphs are pretty minor.
Adding weight makes a difference in start-stop driving. It makes almost zero difference at a steady speed (regardless of what the speed is). At higher speeds it's mostly wind resistance plus a bit of drive train resistance and tire rolling resistance that make up the majority of energy usage (although tire rolling resistance goes down slightly with speed).
People keep forgetting about wheel alignment. Driven wheels have different "optimal" angles from non-driven wheels.
I bet P85D has different front (and maybe even rear) setup from P85.
I bet P85D has different front (and maybe even rear) setup from P85.
LOL.
i I see a common thread between the behaviour of the cult and its leader!
dennis
Model S Plaid
So does this explain why P85D has 12 less miles of range than the P85 in the EPA test (253 vs. 265) and the same 285 mile range at a constant 65 mph?
ToddRLockwood
Active Member
Coming soon to a D near you... Torque Sleep
In a software update to be released by the end of January, all D series Model S vehicles will incorporate a new energy saving feature called Torque Sleep which instantly reduces rear motor torque when not needed.
Driving Range for the Model S Family | Tesla Motors
In a software update to be released by the end of January, all D series Model S vehicles will incorporate a new energy saving feature called Torque Sleep which instantly reduces rear motor torque when not needed.
Driving Range for the Model S Family | Tesla Motors
MarcG
Active Member
Well, it's past the end of January and we haven't confirmed whether any recent update (2.2.115 or 2.2.139) contains the torque sleep software. Some service centers apparently claimed it's been going out since the weekend, but no confirmation from any P85D owner yet.
If you have any updates please feel free to post them here. Thanks!
Andyw2100
Well-Known Member
In the Firmware 6.1 thread here Firmware 6.1 - Page 93
Spentan reported that there is a note about torque sleep in range mode only, and reported hearing a difference when trying it. This is in version .139.
Everyone had been saying there was nothing in the release notes, and apparently there isn't. This was kind of buried.
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