Part 2: The J1 Powertrain

[Sly_North]

Interesting… so basically RWD ECU tune is just about making available the 480 PS already available in LC and, from a torque perspective there is no increase possible.
So the +15%/20% horse power increase on top of the 480 PS promised by folks like redshift is complete BS?

Peak power is unchanged. But the graph shows an increase in torque and power everywhere before reaching the peak.

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[prj]

Peak power is unchanged. But the graph shows an increase in torque and power everywhere before reaching the peak.

No, that is absolutely not physically possible with an electric motor, as it is power as well as current limited.
Look at the graph. 480 PS is possible, that's it. Factory power in launch control is 475 PS. You're not getting magic unicorn torque or power from anywhere. All those who claim that have never datalogged one of these cars or are just out there to make a quick buck off of inflated numbers.

Really appreciate the SoC-based power caps you posted (800 → 790 → 761 → 730 PS). Could you share the rest of the table—ideally every 5 % or 10 % down to the “turtle” zone—so we can see the full profile?

Sorry, but I just don't have time to do that. For these measurements I would have to spend a whole day running my car down every 5% and then measuring it.

Any chance you can confirm how the map is structured—or better, share typical power ceilings at, say, 15 °C / 25 °C / 35 °C for a few SoC points?

The ASG does not control this! I can see these limits in the ASG because it gets them from the bus (flexray/can).
You are free to attempt to recover the AES keys (or whatever is used) for the battery controller, attempt to bribe the factory engineers to sell you an A2L document and then try to decipher this information.

My car has 52 control units. I have access to one - the ASG. Just because I have access to the ASG does not mean I have free access to the other 51 controllers. I do not work for Porsche.

 

[ct14garage]

The ASG does not control this! I can see these limits in the ASG because it gets them from the bus (flexray/can).
You are free to attempt to recover the AES keys (or whatever is used) for the battery controller, attempt to bribe the factory engineers to sell you an A2L document and then try to decipher this information.

My car has 52 control units. I have access to one - the ASG. Just because I have access to the ASG does not mean I have free access to the other 51 controllers. I do not work for Porsche.

@Sly_North I already have access to the BMS

Had to do it when we converted one Taycan battery from LG Pouch Cell to CATL Prismatic.
We emptied all the modules out of the shitty LG Pouch Cells and filled up with CATL Prismatic.
Of course some changes had to be done to the BMS firmware for everything to work.


HOWEVER, even if I could make a new BMS firmware with the max discharge rate increased for you guys to flash....
Do we want this??? Playing with fire.... who is willing to take the risk? I wouldn't!!!

Surely there must be a reason why Porsche set the max discharge rate of this battery to what it is. And with how bad the pouch cells are I wouldnt wanna play with higher currents

 

[prj]

Btw, I think it might be possible to increase the top speed by overrevving the rear motor. The invcon limit is probably higher than the 16000 rpm limiter in the ASG.
16500 rpm would probably give 278 indicated. I am not sure how safe that is long term.

 

[GTSS]

CATL cells in Taycan, now that is something interesting!

 

[ct14garage]

@GTSS Just an experiment! Built a test battery with CATL cells and drove the car!

But I wouldn't daily it, nor sell it. Just for the sake of it!

 

[BjörnfromHamburg]

16500 rpm would probably give 278 indicated. I am not sure how safe that is long term.

"Long term"...those speeds I can drive here in Germany for a total of 1 min. per 3 hours Autobahn with a knife between my teeth.

 

[prj]

"Long term"...those speeds I can drive here in Germany for a total of 1 min. per 3 hours Autobahn with a knife between my teeth.

Hehe, OK. I will test some mods tomorrow on dyno to see if I can get it higher or not

 

[Caraholic]

Random thought. If our batteries are replaced in the future with the J1.2 batteries would any more power be on tap given they have a higher capacity then the J1.1? Glad I have waited, this is the information I was looking for and is at a much more reasonable price.

 

[prj]

Random thought. If our batteries are replaced in the future with the J1.2 batteries would any more power be on tap given they have a higher capacity then the J1.1? Glad I have waited, this is the information I was looking for and is at a much more reasonable price.

The answer to that lies in the BMS. If the BMS allows a higher discharge rate with the new battery, then on the Turbo S, Turbo and GTS absolutely!

 

[paulbroere]

Interesting thread.
I drive a 2023 RWD, but ordered a new 2025 Taycan 4S.
would be nice to know what the possibilities will be for a J1.2 4S (PB+)

 

[ATCO]

No, that is absolutely not physically possible with an electric motor, as it is power as well as current limited.
Look at the graph. 480 PS is possible, that's it. Factory power in launch control is 475 PS. You're not getting magic unicorn torque or power from anywhere. All those who claim that have never datalogged one of these cars or are just out there to make a quick buck off of inflated numbers.


Sorry, but I just don't have time to do that. For these measurements I would have to spend a whole day running my car down every 5% and then measuring it.



The ASG does not control this! I can see these limits in the ASG because it gets them from the bus (flexray/can).
You are free to attempt to recover the AES keys (or whatever is used) for the battery controller, attempt to bribe the factory engineers to sell you an A2L document and then try to decipher this information.

My car has 52 control units. I have access to one - the ASG. Just because I have access to the ASG does not mean I have free access to the other 51 controllers. I do not work for Porsche.

I was just curious about temperature and how it influences the power limit, didn't realize u don't have access to the map.

Anyway, great work and thank you for sharing everything regarding the J1 platform.

I never thought about tuning the car but now I'm really tempted because in real life 4S would be transformed, almost the same performance as tuned Turbo S after 100km/h. Obviously 0-100km/h is limited by much lower torque of the 4S.

 

[Mr.Smith]

@GTSS Just an experiment! Built a test battery with CATL cells and drove the car!

But I wouldn't daily it, nor sell it. Just for the sake of it!

J1.2 battery is still LG?

 

[prj]

I was just curious about temperature and how it influences the power limit, didn't realize u don't have access to the map.

Anyway, great work and thank you for sharing everything regarding the J1 platform.

I never thought about tuning the car but now I'm really tempted because in real life 4S would be transformed, almost the same performance as tuned Turbo S after 100km/h. Obviously 0-100km/h is limited by much lower torque of the 4S.

No problem, it's just different controllers from different suppliers.

But it seems someone here already has access

If you are interested in all those numbers then you can pull them off of your car as well most likely. I need to check what the ASG and the BMS send via basic logging, there might be enough there.

 

[ct14garage]

J1.2 battery is still LG?

Of course. Still LG Pouch Cell

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