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MASTER THREAD: Comprehensive Road-Course Modification Guide — Optimizing the 3 for the track
- Thread starter MasterC17
- Start date
it was a combo of track mode (not reliable) and vbox. I used racerender to put it together
a mix of the track mode data and my own vbox logger for g forces. I use racerender.
a mix of the track mode data and my own vbox logger for g forces. I use racerender.
Keep in mind the problem is not battery heat. What the UI is displaying is the limited amount of current the battery can discharge due to drive unit heat
Solution(s) are in progress!
True, but not nearly to the degree that you are limited due to the drive unit overheating. I'll take a 10-20% power loss from low SOC compared to a 50% loss from thermal limits.
I have 3-4 psi pressure increase just with a city driving on 275 tires. Stock wheels on a track for me was doing +18 psi before I had to back off. CUP2 275 19r was 28->42 psi on a Nurburgring single lap.
I can't imagine how it's possible to do +2 psi on a stock tires on any track.
I agree, this is exactly what I'd really like to see quantified. We have a good understanding of the % of power loss from SOC based on the methodology MPP used on their dyno runs (waiting an hour between each run to let things cool), but not from thermal limits. It would be great to isolate this and to get a better understanding of the interaction between the two factors.
This is data from lap 1 vs lap 4. At lower state of charge with a non heated up car, the car is slower, but recoverable. Problem is that once it heated up, it heats back up very quickly even after if you cool it for a lap or two. Before you are half way into the lap, the car is already losing massive amount of power. There is no coming back from that power deficit.
Great info, this result does seem to indicate that the battery heats up more quickly when running at a lower state of charge than it does when starting with a higher SoC. I'd like to try to quantify the this with Scan My Tesla data next weekend - if I can compel myself to not charge before one of the sessions.
I don't know if I agree with that statement 100% because I did one hot, one cool and one hot. Once again you could see how everything heated up way quicker than before. I will post a video shortly on it.
I should clarify when it heated up, it doesn't necessarily mean it is pulling power. The dash just becomes red and orange quicker than before.
That's what I want to validate. I'd like to compare the power output at a given SoC with an overheated battery, and then start another session with a fresh happy battery at that same SoC. I don't think that a one lap cool down is enough.
This is a case of H-C-H.
In the video, you will see my dash became orange nearly .5 mile before it did on lap 1. It doesn't seem to be pulling power at this point though.
In the video, you will see my dash became orange nearly .5 mile before it did on lap 1. It doesn't seem to be pulling power at this point though.
Not try to harp on this but let's be consistent with our message, the battery is NOT overheating. The drive unit(s) are overheating, which is restricting the amount of power they can pull from the battery. The UI is very confusing, but dozens of data sets confirm the same thing - the battery temperature is not the problem.
I agree that the cooling system for the drive units is not adequate for long-term use on the track. I highly doubt this was a consideration when the Model 3 was designed. At the time, tracking the vehicle was likely not of any consideration. Fortunately, this condition can be resolved. We should have more information to share in the next few weeks.
I agree that the cooling system for the drive units is not adequate for long-term use on the track. I highly doubt this was a consideration when the Model 3 was designed. At the time, tracking the vehicle was likely not of any consideration. Fortunately, this condition can be resolved. We should have more information to share in the next few weeks.
MarcG
Active Member
Has anyone used the "Enduro Drive Unit Oil Cooler"? From @UnpluggedP If so what were the on track effects?
Adrian Cockcroft
Member
I get the data from the CSV file. I think the tires were to hard to start with and it was a cold day, so they never really heated up much. I’ll plot the data and see what it looks like.
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