Could be temperature dependent?
I was lapping at 10% in an ambient temperature of 62F and no noticeable difference. Even in track mode with better temperature control, maybe it struggles over a certain temperature?
-
Want to remove ads? Register an account and login to see fewer ads, and become a Supporting Member to remove almost all ads.
Has anyone tested the decline of power on the P3 with the decline in total battery?
- Thread starter AndrewAllen
- Start date
I was lapping at 10% in an ambient temperature of 62F and no noticeable difference. Even in track mode with better temperature control, maybe it struggles over a certain temperature?
destructure00
Active Member
Ultron
Member
If you are below 10% battery left shouldn't you be driving very easy anyway. I'm gonna be looking for a charing station rather than someone to race.
destructure00
Active Member
When I'm below 10% at the track I'm trying to see how much longer I can go before throwing in the towel
MagnusMako
Member
The voltage curve for most battery types is sharp near 100% and near 0%. In the middle it is flatter. I've never heard of a difference in internal resistance which is the parameter that would limit current. So the major impact to power from the battery state of charge is the voltage change near the ends. Of course the temperature of the battery makes a larger difference I believe. That's why they heat the battery in performance+ mode.
These numbers make pretty good sense. The 0-60 times are all on the part of the power curve that is limited by the motor torque rather than the battery power. That is, the motor output is torque limited rather than power limited. I can't explain the large change at 30% SOC, but the rest are small or zero until getting down to 10% SOC.
The 0-100 mph is controlled much more by the other part of the power curve where the power limit very much depends on the SOC of the battery and so most of the deltas are at the high and low ends. Not sure why the 100 vs. 90% SOC points are only 1.5% different, but there may be something special about 100% SOC that impacts that.
I did some 0-60 runs today at low SoC (10-20%). There are some differences I can see from the data I logged between using Sport mode and Track mode (P3D+).
In Track mode, the acceleration and speed traces look to be much smoother, whereas in track mode there are more spikes, particularly at launch. The data is showing slightly harder initial launches in Track mode.
I've seen some reports from those who have tried both on the dragstrip and don't think there's a difference, but I believe there is, albeit a subtle one which won't always show up in time/speed measurements alone.
It needs more research, but I feel there are benefits to be had using Track mode for 0-60 runs and at low SoC generally if you want to extract the most performance regardless of whether you are on the dragstrip or a circuit. Of course, everyone who is taking their Model 3 to a track is going to want the highest SoC anyway, but it's nice to know what's going on and there may be benefits to be had at much higher SoCs in any case.
I've looked at a number of 0-60/0-100 results on various forums and it's often not stated whether the runs have been in Track mode or not. I suspect most people testing on the street have been using Sport mode.
When SoC is low and the dots appear on the right end of the power meter, I have seen a couple of times that the power is has been limited less when I've been in track mode at the same SoC as when I've been in Sport mode. This again might account for some people saying the car is a slow dog at <20% when I felt it was doing pretty well withTrack mode on at 10% recently.
Now I've got data from the Scanmytesla app as well as from other loggers, it gives me a lot more to go on besides 'feel' so I'll be looking more closely at the power and torque numbers at various SoC and different modes to see what's going on.
In Track mode, the acceleration and speed traces look to be much smoother, whereas in track mode there are more spikes, particularly at launch. The data is showing slightly harder initial launches in Track mode.
I've seen some reports from those who have tried both on the dragstrip and don't think there's a difference, but I believe there is, albeit a subtle one which won't always show up in time/speed measurements alone.
It needs more research, but I feel there are benefits to be had using Track mode for 0-60 runs and at low SoC generally if you want to extract the most performance regardless of whether you are on the dragstrip or a circuit. Of course, everyone who is taking their Model 3 to a track is going to want the highest SoC anyway, but it's nice to know what's going on and there may be benefits to be had at much higher SoCs in any case.
I've looked at a number of 0-60/0-100 results on various forums and it's often not stated whether the runs have been in Track mode or not. I suspect most people testing on the street have been using Sport mode.
When SoC is low and the dots appear on the right end of the power meter, I have seen a couple of times that the power is has been limited less when I've been in track mode at the same SoC as when I've been in Sport mode. This again might account for some people saying the car is a slow dog at <20% when I felt it was doing pretty well withTrack mode on at 10% recently.
Now I've got data from the Scanmytesla app as well as from other loggers, it gives me a lot more to go on besides 'feel' so I'll be looking more closely at the power and torque numbers at various SoC and different modes to see what's going on.
MagnusMako
Member
Thread below is some actual dyno testing that MountainPass performance just did with the P3D showing the true hp drops at various SoC levels. Below 75% there is a significant drop off. Due to voltage sag the inverter is cutting back power to protect the battery. From 95-100% is moot, with maybe 1-2 hp difference.
Vendor - Model 3 Performance Dyno Test: Binned Motors?
Video from said thread:
My own track experience showed a small, but consistent drop in ET as I moved from 92% SOC down to mid 80s. Something to worry about if you are racing it, but nothing to worry about in normal spirited driving.
