Tesla Motors Club

I am wondering if torque sleep is not functioning properly on some cars. In particular, I'm interested in determining if torque sleep is functioning properly or not on my P85D. I have some pretty solid evidence that it is not. I have been trying to discuss this with Tesla, but not having much success. Before I make even more of a nuisance of myself than I already have, I thought I would present my case for torque sleep not working properly in my car here, to see what some of you think.

I have a P85D, with 19 inch Cyclone wheels and the Pirelli Sottozero Series II winter tires. They have been inflated properly. Last night I checked them and they were all at about 43.5 PSI and I increased them all to 46 PSI.

When I first contacted Tesla about this it took a couple of days and a few phone calls, but eventually I received the following:

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One of our field engineers reached back out to me regarding torque sleep on your vehicle.
He said that torque sleep is active on your vehicle. When he looked at the logs for your vehicle, here is the information the car told us.

1/23 through the end of 2/1 (before torque sleep update was pushed to your vehicle)
Total Avg consumption: 417wh/mi
Avg HVAC (A/C and Heater) Consumption: 47wi/mi
Avg 12v consumption: 11wh/mi
Total avg – avg HVAC – avg 12v = 359wh/mi

2/2 through 2/12 (after torque sleep update was pushed to your vehicle)
Total Avg consumption: 434wh/mi
Avg HVAC (A/C and Heater) Consumption: 68wi/mi
Avg 12v consumption: 15wh/mi
Total avg – avg HVAC – avg 12v = 351wh/mi

So it looks like any efficiency increase you gained from torque sleep, was canceled out by the increased usage of the HVAC system and the 12v battery (increase in 12v consumption could come from the seat heaters, radio, lighting, etc). He said your car is operating normally and torque sleep is enabled and working. He said that there are a lot of variables that can affect your efficiency, like speed, temperature, tire PSI, acceleration rate, cargo in the vehicle, and terrain.

So at this point in time everything look like it is working properly on your vehicle. If you have more questions, let me know.
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Note that the conclusion that torque sleep is working is in no way supported by the numbers, which show a decrease of 8 wh/mi after adjusting for HVAC ad 12V usage. 8wh/mi is basically noise over such a short time period. It is also roughly 2% of the 359 wh/mi original figure.


I have photos of trip data I took on February 4, just a few days into torque sleep, and again today. Using the February 4 information as "before", I get the following:

This shows a very slight reduction of 14 wh/mi in the month we've been driving with torque sleep. But before we get too excited about this 14 wh/mi, let me point out a couple of things. One is that those first 2358 miles include the first 1000 miles, on brand new tires, which are supposed to be at worse efficiency. Also I certainly did a lot more Insane Mode 0-60 launches in those first 2000 miles than I've been doing lately. So without any benefit from torque sleep we would have expected to see some improvement in this last month. Also before 02/04 we never used range mode. We have been using range mode almost exclusively once we learned that torque sleep worked more effectively in range mode, with the exception of a few trips while we still had .167 installed and knew that we should not be using range mode in .167. Even before torque sleep existed, there were efficiency gains from using torque sleep, so some of the gains of the last month should be attributed to that. If any of the 14 wh/mi improvement is due to torque sleep itself, it's probably only a small part of the improvement.





In addition to the evidence above, I've been logging all of our highway trips, which are the vast majority of our trips, and comparing them to EV Trip Planner expectations. The result is that we're typically near or above EV Trip Planner energy usage estimates. Other P85Ds that have compared trips to EV Trip Planner are typically 8-12% better than EV Trip Planner expectations. (I started a thread on this here: Comparing P85D Torque Sleep efficiency (versions .139 and .140) to EV Trip Planner)

The vast majority of the driving we do and all the logged trips include a highway segment of at least 30 minutes as well as a good bit of time on rural roads with speed limits of 45-55 MPH. This would seem to be the perfect environment for torque sleep to kick in. Whenever possible, meaning whenever weather conditions permit, we use TACC on the highway portion of the trips, so driving style does not come into play. And as for driving style, both my wife and I are probably on the very mellow end of the curve. She sets the TACC speed to 68 and I set it to 70 (the speed limit is 65) and we both set the following distance to the max of 7. These trips are also all taken in sport mode. Here are all those trips, with the comparisons to EV Trip Planner:


What do you think? Is it reasonable for me to believe torque sleep isn't working correctly on my car, based on my efficiency numbers as compared to other P85Ds, and as compared to my numbers from before torque sleep was implemented? And if it's not working correctly on my car, there's a chance it's not working correctly on others as well.

Thanks for any input.