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Lost half my Ludicrous upgrade

sorka

Well-Known Member
Feb 28, 2015
9,592
7,891
Merced, CA
Recently, sometime in the last 4 months, my max battery power @90% @5 minutes from max battery ready(i.e. not fully warm but close) has dropped from 458KW (1535 amps * 298 volts) to 336KW (1535 amps * 284 volts) (+- a few KW).

It seems like it must be battery degradation since the current remains at 1535 amps but the voltage has dropped at the same charge level at the same temperature.


Prior to the upgrade, max power under the same conditions was 414KW, so this represents about half of the Ludicrous upgrade lost.

Just curious what other P85D owners Insane or Ludicrous are seeing under the same conditions?
 
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MP3Mike

Well-Known Member
Feb 1, 2016
18,811
46,784
Oregon
Recently, sometime in the last 4 months, my max battery power @90% @5 minutes from max battery ready(i.e. not fully warm but close) has dropped from 458KW (1535 amps * 298 volts) to 336KW (1535 amps * 284 volts) (+- a few KW).

Prior to the upgrade, max power under the same conditions was 414KW, so this represents about half of the Ludicrous upgrade lost.

What firmware version does your car have?

You've got some interesting math there. ;) Pre upgrade: 414kW, post upgrade: 458kW. Upgrade = 44kW. So if you lost half of your upgrade you would be at 436kW. If you are really at 336kW, you have lost 277% of the upgrade not 50%.
 
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n2mb_racing

Active Member
Jun 14, 2014
2,086
1,927
durham, NC
Recently, sometime in the last 4 months, my max battery power @90% @5 minutes from max battery ready(i.e. not fully warm but close) has dropped from 458KW (1535 amps * 298 volts) to 336KW (1535 amps * 284 volts) (+- a few KW).

It seems like it must be battery degradation since the current remains at 1535 amps but the voltage has dropped at the same charge level at the same temperature.


Prior to the upgrade, max power under the same conditions was 414KW, so this represents about half of the Ludicrous upgrade lost.

Just curious what other P85D owners Insane or Ludicrous are seeing under the same conditions?
Cold battery?
 

sorka

Well-Known Member
Feb 28, 2015
9,592
7,891
Merced, CA
How (what tool) are you using to measure kW output? I also have a v1 p90DL and new firmware was installed today. I will run same test though I don’t have baseline.

My Car also “feels” slower though I also just got car back after a week in service.

The easy one is PowerTools for iOS but that won't give you current/voltage, just power in kW.

TM-Spy is better but requires a $15 bt elm327 dongle and a cable adapter that will plug into the CANBUS connector. I made my own.
 

bhzmark

Active Member
Jul 21, 2013
3,979
7,115
Recently, sometime in the last 4 months, my max battery power @90% @5 minutes from max battery ready(i.e. not fully warm but close) has dropped from 458KW (1535 amps * 298 volts) to 336KW (1535 amps * 284 volts) (+- a few KW).

It seems like it must be battery degradation since the current remains at 1535 amps but the voltage has dropped at the same charge level at the same temperature.


Prior to the upgrade, max power under the same conditions was 414KW, so this represents about half of the Ludicrous upgrade lost.

Just curious what other P85D owners Insane or Ludicrous are seeing under the same conditions?

try 100% SOC. I know someone, maybe you, was convinced more power was at 90% SOC, but I got my higher power, and lower 1/4 mi ET closer to 100%. And I got my fastest ET, 11.3, on a very hot day, just before the battery went into cool mode.

Warm ambient temps assisting the battery heater and bringing it heat soaked right to brink of needing to implement remedial cooling, is probably the recipe for the most power. Your baseline condition that you are trying to replicate could have been more under those conditions.

Although thinking about it more, i tmight not have been the battery that was too hot and kicking in the cooling, but the motor etc. So maybe the battery still has some headroom to go hotter, over and above what max battery power heater can generate. And you need to get that through ambient temp or supercharging or use.

But it wouldn't surprise me if their were some degradation eventually as well.
 
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sorka

Well-Known Member
Feb 28, 2015
9,592
7,891
Merced, CA
try 100% SOC. I know someone, maybe you, was convinced more power was at 90% SOC, but I got my higher power, and lower 1/4 mi ET closer to 100%. And I got my fastest ET, 11.3, on a very hot day, just before the battery went into cool mode.

Warm ambient temps assisting the battery heater and bringing it heat soaked right to brink of needing to implement remedial cooling, is probably the recipe for the most power. Your baseline condition that you are trying to replicate could have been more under those conditions.

Although thinking about it more, i tmight not have been the battery that was too hot and kicking in the cooling, but the motor etc. So maybe the battery still has some headroom to go hotter, over and above what max battery power heater can generate. And you need to get that through ambient temp or supercharging or use.

But it wouldn't surprise me if their were some degradation eventually as well.

Even if that were true, my previous readings of mid high 450s was at 90%.

As far as the motor temp, the battery was heat to just shorted of reaching max battery and then driven lightly for a few miles to warm up the bearings on the DUs and then full bore so the motor was already cool and battery already warm to start out.
 

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