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Can. I get insane mode on 2013 P85

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The only difference would be ~ 40 hp increase since P85 have 1200 A P85D have 1300 A fuse.
At high loads a voltage drop will occur and therefore 100 A x 300 V = 30 kW or 40 hp.

Charge up to 90-100 SOC when you need the performance. You can feel the 40 hp bump from 50 % SOC compared to 100 % SOC. I
 
Isn't the P85+ limited by the rear motor being only 470bhp and as the battery in a P85D is limited to about 555bhp before ludicrous, going P85+L would just mean the battery exceeds what the rear motor can handle by even more?