Part 2: The J1 Powertrain

[rs38]

wow, this takes some time to read but great to find it at this level.

two main points came into my mind:

1. Porsche has a launch control counter implemented which can be easily read with carscanner/piwis. There is also a hard limit which needs to be factory reset if reached.
This is a very obvious indicator that the OEM thinks that pushing to the advanced limits is stress for the hardware (axles, gearbox, shafts, motors, power electrics, diffs etc.)

2. the actual battery limit can be observed by everyone with carscanner, there is a value "max. amps" for charge and discharge, which is a result of the (so far) unknown multi-dim map mainly depending on SoC and temp. Afaicr this is ~860A from 100% SoC down to at least 50% if the temp is > 25 °C or so.
This means the batt max. power limit is directly dependend on the system or cell voltage. so you can do the math 100% SoC = 198 x * 4,2V (OCV) * 860A = 715 kW in theory but voltage drops under load, so it will be at 600kW like Dmitri just explained. Either log by yourself or find some cell info at batemo for the LG cells.

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[prj]

wow, this takes some time to read but great to find it at this level.

two main points came into my mind:

1. Porsche has a launch control counter implemented which can be easily read with carscanner/piwis. There is also a hard limit which needs to be factory reset if reached.
This is a very obvious indicator that the OEM thinks that pushing to the advanced limits is stress for the hardware (axles, gearbox, shafts, motors, power electrics, diffs etc.)

Yeah because you're slamming in the power hard when stationary. When moving this is not a problem.

One more benefit to have LC power available all the time - launch counter does not get incremented

 

[rs38]

I kindly disagree, as I think the tires are the limits of traction at least until 60-70kph and so there is no less stress for the hardware if you kick full throttle a 60 or at 0 kph (1st gear RA). There is probably Lastschlagdämpfung or other limitors or smoothening as in ME7 etc. but this is as well happening during stand still start as you would lose traction without

 

[prj]

I kindly disagree, as I think the tires are the limits of traction at least until 60-70kph and so there is no less stress for the hardware if you kick full throttle a 60 or at 0 kph (1st gear RA). There is probably Lastschlagdämpfung as in ME7 etc. but this is as well happening during stand still start as you would lose traction.

If you have bad tires then sure. I had traction from 70kph on winter tires on my Turbo S, idk what you are putting on yours.
Anyway that's the reason it pre-tensions the drivetrain and it has heavy filtering on the torque - to avoid heavy lash in the drivetrain. Also why it's a pretty bad idea to completely disable the filtering.

 

[Mr.Smith]

Yeah because you're slamming in the power hard when stationary. When moving this is not a problem.

One more benefit to have LC power available all the time - launch counter does not get incremented

Happened to my friends RS E-Tron GT, broke the drive shafts. Audi said the launch puts a lot of stress on the hardware.

 

[prj]

Happened to my friends RS E-Tron GT, broke the drive shafts. Audi said the launch puts a lot of stress on the hardware.

Yep, especially if you do that on a prepped track, then it's brutal on the car.

 

[Mr.Smith]

Yep, especially if you do that on a prepped track, then it's brutal on the car.

Yes. He was doing too many launches on the street.

 

[tigerbalm]

These control units are Bosch Invcon controllers

Out of interest, what is this component made by Hitachi in Japan ?

Porsche Taycan Rear Motor by Damien Glancy, on Flickr

 

[freeforall]

Out of interest, what is this component made by Hitachi in Japan ?

Porsche Taycan Rear Motor by Damien Glancy, on Flickr

I think it is the inverter https://www.ltec-biz.com/en/report/...n2019-gate-drive-pcb-circuit-analysis-report/

 

[prj]

I think it is the inverter https://www.ltec-biz.com/en/report/...n2019-gate-drive-pcb-circuit-analysis-report/

Yeah, that's the inverter itself, not the inverter controller.

 

[Mr.Smith]

I think it is the inverter https://www.ltec-biz.com/en/report/...n2019-gate-drive-pcb-circuit-analysis-report/

Shame Taycan doesn't use SiC for all of their inverters, on all variants

 

[Rik_CT4s]

One for the team...pre tuning testing
Germany Nurburgring Eiffel....with a full battery this time.
Due to Tesla short charging cables this is the way ....some Tesla drivers waiting (well sorry, I need full juice before hitting the track)

 

[Kainlow]

I am working on the temp website and the descriptions.
I do a few things other than giving the real full launch power & torque all the time. The antisurge damper (torque filter) is recalibrated to disengage when the powertrain is pretensioned and there's a sharp throttle movement giving much better throttle response during dynamic driving, the shiftpoints are optimized to deliver the maximum power better in all modes, the top speed limitation is removed, only the motor rpm limiter remains, and few other bits...

If your car is not tuned yet, then I'd say it's a nobrainer. Certainly the difference is big in normal driving.
The theoretical launch control is all well and good, but 99% of the time it is just that - theoretical. Together with the other modifications the car goes from being fast to brutal snap power delivery when you want it, yet drives exactly like stock when you don't.

But of course I am selling this stuff. So one of you will have to take the plunge.
If you're not happy with it - send it back and I'll give you a refund. I don't think I will ever have to do that, but maybe that gives some peace of mind


The ASG constantly records this information in the background, but yeah they don't send that online ... yet. Only when warranty work needs to be performed they have to do a check, and only at that moment the information is communicated.

That said, I am sure in the future this will go online (on new platforms). BMW already do that. Tune the car and your warranty is gone before you can blink.

Say we have the tuned ASG in for several months, and then have to take the car in for service. Would the original ASG show "gaps" in recording time wince it was removed? Could this raise flags for the dealer to investigate further?>

 

[prj]

Say we have the tuned ASG in for several months, and then have to take the car in for service. Would the original ASG show "gaps" in recording time wince it was removed? Could this raise flags for the dealer to investigate further?>

No. None of that matters. Only the TD1 readout at the moment of service, and if unsigned software download has taken place to the unit at any time in the past.

The dealer doesn't investigate anything! I have said this many times before. It's only Porsche themselves who can void a warranty. It's not in the interest of the dealer to have a warranty voided.
The whole dealer "investigation" is pushing a button in PIWIS, that's all. The dealer doesn't know anything about how this works. This is not in any training materials, this information is "top secret".

Right now they don't even flag your car if it's tuned - and they might never do. It's just a precaution.

 

[Sly_North]

One for the team...pre tuning testing
Germany Nurburgring Eiffel....with a full battery this time.

Oh I'm suuuuure this was a painful one taken for the team: oh snap, I HAVE to ride the Nurb Nordschleife for testing, too baaaad
Good that they have this Tesla SC - but having more charging slots would be nice.

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