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The rear drive unit can take 1400 AMPS?!!! Wow. That's a lot of power for a small unit. Did you do something special with the thermal monitoring, to ensure that you don't cook the motor? Or is the drive unit smart enough to protect itself?
How much is the basic P85's max power? motor and battery
Would you be able to mod cars that have upgraded to 8.x?
I know the backdoor you used has been closed now, but can you downgrade the firmware to get access?
With the knowledge and talent you have who needs warranties?
get some slicks and head to the 1/4 mile track
Perhaps a dumb question, but how do you get the cool stats to show up on the right side of the instrument cluster? Something you did or something we could all do?
Can't wait to see the new 0-60 times.
Might have to consider a road trip to NC now.
How many launches/WOTs before power is limited?
@wk057 as i understand it's not just software, you need battery pack and fuses, contactors, etc... from the new models?
Anyway to take a S90D and turn it into a P90D?
The P85s cars are RWD and have a large motor in the rear...
Wish there were a track open nearby. Will probably be a few months.
The next obvious question being, is there room for rear drive unit in the front? And would a 100kwh battery be better able to fully utilize them with the proper amps?I've been offered positions at Tesla, but I refuse to move to California. Apparently that's a deal breaker. Besides, probably wouldn't be as much fun.
The front frame rails are totally different on the RWD cars. It would take extensive modification to do so. Certainly not impossible, but would need way more power available to even bother. A P100D cant even max out a small front and large rear, let alone two large DUs.
Not just software hacks. The pack is actually a Ludicrous pack now. The motor is a recent warranty swap that happened to be a P85D compatible unit that is the same revision as was in my P85D. So, overall, should be perfectly fine. Definitely kissed those warranties goodbye, though.
So, I just finished some initial testing of my latest modification to the yellow P85 (the one that has retrofitted autopilot hardware). Haven't gotten a lot of pics or videos together yet (roads have been wet from melting snow, so not great conditions for testing), but I can't resist sharing some initial details.
So far the car is a ~570HP RWD monster that desperately needs wider rear tires. It doesn't even have the staggered rims, so I'm putting this all through 245's at the moment and traction control stays on up to like 45 MPH. lol.
The car and everything in it are now running P85D firmware. The battery has been upgraded to a P85D Ludicrous pack. The car does not actually have a front motor, however. The front motor is being emulated by custom hardware and software that essentially tricks the car into thinking there is a front motor and that all of the power needs to go to the rear... and it does exactly that.
The performance rear drive units appear to have a max current of around 1400A. Ludicrous allows ~1520A, so even with HVAC on and such the motor can still max out.
In my testing at around 90% SoC and battery at about 32C the power maxed out at about 426kW. I plan on trying Max Battery Power @ 100% charge. Oh, and launch mode works too.
I finished up some code to make the car happy enough to not display any errors at all finally, but by then the pack was down to about 50% SoC. Did a few more test runs and snapped some photos of the dev readouts screen.
(Even at 50% SoC was still getting ~380kW/508 HP)
Hopefully roads dry up and I can grab the VBOX tomorrow for some testing at 100% SoC and a warm pack.
More soon.
(Yes, it's technically the wife's car.... although she uses the X mostly now)
Jason Hughes on Twitter
Edit: Oh, and um... I may plan on offering this modification as a service at some point to P85/P85+ folks.
If I understood correctly, the drive unit is physically the same as a P car, but would require software change (is that currently possible?)
The front frame rails are totally different on the RWD cars. It would take extensive modification to do so. Certainly not impossible, but would need way more power available to even bother. A P100D cant even max out a small front and large rear, let alone two large DUs.
We need @wk057 to clarify this, because my understanding is that non-P cars have a smaller rear motor. Only the P cars got the big boy rear motors.
J
Can anything like this be applied to a plain 85?
Thanks
D.C.
We need @wk057 to clarify this, because my understanding is that non-P cars have a smaller rear motor. Only the P cars got the big boy rear motors.
This is what I'd like to see as well. It could really make up ground on the last 1/8get some slicks and head to the 1/4 mile track
holy crap... I can't imaging what that ride must have been like!
Seriously though, wouldn't this be possible on an early 85 (S85) from 2012 with new battery, fuses, etc?