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Discussion Starter #1 (Edited)
While this is about the Tesla Model 3 performance it highlights the advantages of electric cars in general and level of controls in the drivetrain.


How Track Mode Works
The Tesla Team 8 November, 2018

Electric powertrains have numerous advantages over internal combustion engines. In addition to low cost of ownership, energy efficiency, and near silence, they also offer unparalleled responsiveness. Since the introduction of Tesla Roadster in 2008, we’ve exploited the immediate availability of motor power and torque to achieve unprecedented straight-line performance, making the car’s forward acceleration a pure extension of the driver. With Track Mode, which is designed specifically for use on closed autocross circuits and racetracks, our goal was simple: use that same motor power and torque to make cornering on the track feel just as natural as forward acceleration.


The fundamentals

How does motor power help you corner? If you’ve ever pulled a car’s handbrake in an icy parking lot, you know that you can make a car turn with more than just the steering wheel. That’s because torque – whether accelerating or decelerating a vehicle – reduces a tire’s ability to hold the car in a turn. Apply torque to the rear wheels, and the car will rotate more in the turn (if you see a car drifting, that’s drive torque; or think about pulling that handbrake, that’s brake torque). Conversely, if you apply either kind of torque to the front wheels, this reduces a car’s ability to turn.

By precisely controlling whether torque goes to the front or the rear wheels, Model 3’s dual motors can immediately and silently increase or decrease the car’s rotation in a corner at your request. This requires lightning fast torque control and the ability for the car to precisely regulate traction on each tire – both of which are standard features in every Tesla, but that we’ve expanded upon with Track Mode to make highly technical driving effortless.

More than just stability

The most exciting aspect of Track Mode is how we can change the balance of the car using just the motors – a technique that would typically be interrupted by a system known as stability control.
Stability control is an important safety feature found in all modern passenger vehicles that applies brakes to certain tires in order to prevent your car from spinning out of control during dynamic maneuvers. The feature is designed to make a car’s behavior more predictable in emergency situations, but it also constrains a driver to a limited range of capabilities at the expense of driver authority and fast lap times. As a result, many cars have “sport” modes that reduce or even disable these safety systems in order to allow a professional driver to maximize the capability of what a car can offer.
Instead of taking away features to enhance the experience of professionals, Track Mode adds features to make any track driver, amateur or professional, feel superhuman on a track. This is possible because with Model 3 Performance, we replaced the stability control system with our own in-house Vehicle Dynamics Controller – software developed specifically for Tesla vehicles that acts both as a stability control system and also as a performance enhancement on the track.

More features, not fewer

Here is a summary of many of the features we employ with Track Mode while you’re on the track:


  • Motor Torque for Rotation
    Our Vehicle Dynamics Controller constantly monitors the state of the vehicle and all of the inputs from the driver to determine the driver’s intention and affect the rotation of the car in a matter of milliseconds. Track Mode relies heavily on the front and rear motors to control the car’s rotation, and we have the ability to command a 100% torque bias. When cornering, if rotation is insufficient to the driver’s request, the system commands a rear biased torque. Conversely, when rotation is excessive, we command a front biased torque.
  • Increased Regenerative Braking
    Heavy regenerative braking may not be comfortable for day-to-day driving, but on a track, it has several key advantages. It gives the driver more authority with a single pedal, improves the endurance of the braking system, and sends more energy back into the battery, maximizing the battery’s ability to deliver large amounts of power. It also gives the Vehicle Dynamics Controller more authority to create or arrest rotation with the motors when your foot is lifted off of the accelerator pedal.
  • Track Focused Powertrain Cooling
    The high output power required for track driving generates a lot of heat, so endurance on the track requires more aggressive cooling of the powertrain. We proactively drop the temperatures of the battery and the drive units in preparation for the track and continue to cool them down in between drive sessions. We can also allow operation of the powertrain beyond typical thermal limits and increase our refrigerant system capacity by overclocking the AC compressor into higher speed ranges.
  • Enhanced Cornering Power
    We typically think of using brakes to slow down a car, but you can actually use them to make the car faster out of a corner. All Model 3s are equipped with open differentials, which send an equal amount of torque from the motors to both the left and right wheels. When cornering, the wheels on the inside of the corner have less load on them, which means they can provide less tractive force than the outside wheels. To prevent excess slip on this inside tire, we have to limit the torque for both wheels, leaving power on the table. In Track Mode, we simultaneously apply brake and motor torque to produce a net increase in tractive force while cornering. This is similar to how a limited slip differential works, except when using the brakes, the differential can be optimized for various driving conditions.

Model 3 Performance with Track Mode integrates active controls with the vehicle’s already planted chassis and nimble, responsive steering by maximizing the driver’s authority under any condition. We do this with the same secret weapon used for 0-60 mph launches: the two motors that sit on each axle. And like most aspects of a Tesla, we’ll continue to improve and enhance Track Mode over time with future over-the-air updates.


https://www.tesla.com/en_AU/blog/how-track-mode-works?redirect=no
https://electrek.co/2018/11/08/tesla-track-mode-model-3-performance-how/
https://www.motorauthority.com/news...3-performance-adds-track-mode-system-detailed


Great video inside of below article (below is screen image):
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https://www.motortrend.com/cars/tes...erformance-track-mode-release-version-review/
 

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That sounds like some crazy performance. Makes me wonder how to lock my teenage son out of that kind of driving when I'm not around.
 

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That sounds like some crazy performance. Makes me wonder how to lock my teenage son out of that kind of driving when I'm not around.
Put the car in Valet mode and attach a low max speed. I think you can even do that through the phone app...
 

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Discussion Starter #4

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Those limits are some good options to have. Ford has a similar feature, but I think this is rare among the other car makers. I'd really like to see a speed limiter that was indexed to the legal speed limit. 70 mph is slow on the expressway but insane in a neighborhood or school zone.
 

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Discussion Starter #6
Added the excellent article and a couple images to bottom of my initial post from MotorTrend.

They had a professional driver and a lot of computer analysis going on with a track run.
_

 

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Very nice, seems like they tuned "track mode" to match what a racecar driver expects, as opposed to previously, when the car was intervening too much, limiting an expert driver's ability to extract max performance. Would have liked to see a racetrace of that corner with standard mode vs track mode.
 

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Discussion Starter #8

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awesome article ,wonder if I can get those engineers from tesla to work on my cadi.:p
 

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Discussion Starter #10
Title: Tesla update gives Model 3 drivers more power and control for track events
https://www.teslarati.com/tesla-model-3-tmps-update-track-mode

It appears that Tesla is starting to release a number of new features that will make its vehicles more fun to drive on the track. Recent reports from Model 3 owners indicate that version 2019.12 includes optimizations for the electric cars’ high-speed performance and Tire Pressure Monitoring System (TPMS).

The updates being rolled out by Tesla were shared recently by Tesla Owners Online forum members and Model 3 owners
dannyskim and MGallo, both of whom shared screenshots of 2019.12’s Release Notes. In its section for “High Speed Performance,” Tesla noted that “your car can now maintain torque and power for longer periods of time when driving at high speeds.” An update for the vehicles’ Tire Pressure Monitoring System was listed as well.
 

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Discussion Starter #11 (Edited)
Tesla made significant track specific customization to the Track Mode (v2) feature recently in an OTA.

Several videos in this article: https://insideevs.com/news/402743/video-release-notes-tesla-track-mode-v2/

Here's one: Jump to 3:30 in the video for a screen overview.

https://youtu.be/QXyEgl9rFN4?t=184


ESLA’S NEW SECRET TRACK WEAPON! Model 3 Track Mode V2 & Track Package
Mar 2, 2020 Salomondrin with 1.63M subscribers


Below are Tesla's full release notes related to the Track Model V2 software update:


Track Mode has been improved to make it easier to monitor the status of your car, create custom track mode settings profiles and record your track day data.


Monitor the status of your car motors, battery, brakes and tires, allowing you to adjust your driving in real time. G-meter, a real-time accelerometer, can now be viewed in the Cards area of the touchscreen. The map now displays a Lap Timer. Follow the onscreen instructions to place a start/finish pin on the map. At the completion of each lap, the Lap Timer displays the duration of the lap. It also displays the times associated with the previous and best laps in the driving session.


Track Mode allows you to save up to 20 Track Mode profiles to suit your preferences or driving scenario, or customize for a specific track. A new settings profile can be created by tapping Track Mode Settings and; Add New Settings, entering a name for the settings profile, then adjusting settings including Handling Balance, Stability Assist, Regenerative Braking, Post-Drive Cooling and Compressor Overclock. Refer to the Owner’s Manual for more information regarding each setting.


You can now save a video and data of the Track Mode driving session to a plugged in USB flash drive which must contain a folder named “TeslaTrackMode” (without the quotation marks). When “Save Dashcam for Laps” is enabled, Track Mode stores a video of each lap in a driving session when using the Lap Timer.

Track Mode also stores the car status and telemetry data including details about the vehicle’s position, speed, acceleration, and use of accelerator which is stored as a .CSV file on the USB flash drive.




 
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