Part 3: The Quest for the Perfect Tune

[Rik_CT4s]

I can't really measure 1/4, it's too cold here and my tyres don't work yet in this weather. We have around 6C. 100-200 is ok though.

That said, my car is waiting on some broken climate flap replacements atm with the center console disassembled, which might take longer than expected, in which case I might not be able to get to this until next Friday.

No problem. Appreciate your efforts in this matter.
Personally, I am looking for a tune that addresses my slow 100-200 and 1/4 mile.
0-100 will be unchaged and is generally fine with 2.8-2.9s generally.
1/4mile not bad. But not great either.
Disappointing 100-200 on the TS. Did you measure stock 100-200 before on yours?

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[prj]

No problem. Appreciate your efforts in this matter.
Personally, I am looking for a tune that addresses my slow 100-200 and 1/4 mile.
0-100 will be unchaged and is generally fine with 2.8-2.9s generally.
1/4mile not bad. But not great either.
Disappointing 100-200 on the TS. Did you measure stock 100-200 before on yours?

I have not yet. I did do measurements on the E-tron GT and on the Taycan 4S with the small battery when I was tuning them.

My car well... the biggest difference was from the filter bypass together with the launch hack. The extra power wasn't even as impressive. But then I drive mostly around town.

That said, it's now quicker at speed than my Audi S8 (which is not stock), so that's good.

 

[whitex]

What makes the tuned Taycan 4 capable of sustaining higher torque than tuned Taycan 4S with PB+ after ~68km/h (green line I added in your graphs above)?

 

[prj]

What makes the tuned Taycan 4 capable of sustaining higher torque than tuned Taycan 4S with PB+ after ~68km/h (green line I added in your graphs above)?

You are comparing the graph with PB not PB+.

All Taycan 4's have PB+ afaik no cross- or sport turismo has PB.

 

[whitex]

You are comparing the graph with PB not PB+.

All Taycan 4's have PB+ afaik no cross- or sport turismo has PB.

Touché. My bad. In my head I mistakenly assumed there was a 4S and 4S Performance Battery, rather than 4S Performance Battery and 4S Performance Battery Plus. There is no such thing as a 4S in your graphs.

 

[prj]

0-100 will be unchaged and is generally fine with 2.8-2.9s generally.

Btw, I wanted to just highlight that on the Turbo S with the launch enable patch your 0-100 will be very much affected outside of launch mode. So if you're rolling at low speed and then you floor it the difference will be significant.

 

[lcarron]

The stock graph is copy-pasted torque limit out of the ASG (!!!).
Yes, it is much slower, because already from 20mph the torque is faded out.

Have a look at the overlay:

Don't read feels. Trust the actual values out of the stock software.

Here.... go crazy

Hello,



I must admit that a lot of work has been dedicated to this, and I appreciate the Excel document. However, I am a bit confused by the three graphs for the 4S and need further explanation.

What do columns B and C represent compared to D and E? Is it a comparison of before and after the tune? It appears that the launch control power is slightly higher. Additionally, your competitor has a maximum of 610 HP, while yours is 730. This represents a massive gain over theirs, and I do not understand how it is possible unless they are calculating an average of some sort.



Anyway, a bit of legend on the column name will be very welcome.

 

[prj]

I must admit that a lot of work has been dedicated to this, and I appreciate the Excel document.

Please note the Excel document is not "official release", it's just what I used internally.

However, I am a bit confused by the three graphs for the 4S and need further explanation.

You did not mention the sheet.

What do columns B and C represent compared to D and E?

If you mean the "4S Total" sheet, then this is the maximum possible power and torque that the inverter controllers deliver. B and C is outside launch mode, and D and E is with launch mode active.

Is it a comparison of before and after the tune?

No. For that look at the "4S 1st" sheet, this gives you the total powertrain torque before-after with speed up to 100kph (61mph).

Additionally, your competitor has a maximum of 610 HP, while yours is 730. This represents a massive gain over theirs, and I do not understand how it is possible unless they are calculating an average of some sort.

They probably have no idea what they are selling because they never datalogged anything. Same like promising 1050Nm on the Turbo and GTS or 500+hp on the Taycan RWD when that's not possible, as it's hard limited by the inverter controllers. Very much possible their tune makes more than the advertised power. But for sure it does not make the 830Nm advertised torque - it will make 640Nm outside of launch control and 660Nm with launch control, and not a bit more.

Nobody who is selling tuning for these cars has logged or measured anything. They just max a limiter, come up with an arbitrary made up number, charge big bucks and call it a day.
That's why I posted all this, to put a stop to it.

The numbers are the maximum anyone can attain by tuning the ASG. If you want more torque or power then the inverter controllers need to be modified and/or the BMS. I would not recommend messing with that unless it's a race car where you don't care about battery or motor damage and are chasing the last 5%.
Modifying the ASG is perfectly safe and keeps all components within their factory tolerances. Overriding the battery discharge rate or the motor controller maximum amperages in their respective controllers is unsafe.

Anyway, a bit of legend on the column name will be very welcome.

I appreciate that, but I was not planning to release the Excel data, people just kept overlaying stuff and bugging me about it, so I gave it as-is so you can have the raw data and don't have to resort to image manipulation.

 

[Mr.Smith]

What are your thoughts on the amount of power that is lost as the SOC decreases?

I wonder in the J1.2 battery pack would be any better?

 

[prj]

What are your thoughts on the amount of power that is lost as the SOC decreases?

I wonder in the J1.2 battery pack would be any better?

I mean what can I say about it?

Of course the J1.2 battery pack is better. But probably on the Taycan GT you have the same issue like on the J1.1 Turbo S. Where you are limited by the battery pack.

Just the limit is around 1050hp instead of 800hp on the old pack. Which if you think about the capacity increase pretty much make sense too.

I will know the exact numbers once I can flash the J1.2 cars and inject my logging code. Then we can have all of these curves for J1.2.
Of course I will share them here. All the OEM ASG torque limits I already have, but to get the invcon limits I need to log.

 

[bn8959]

Ive just placed an order with @prj for my GTS. Looking forward to testing your work out!

 

[BjörnfromHamburg]

When you tune, do I assume right:

No LC necessary anymore, as the car uses it "all the time" (given the time brackets).

Car feels "sharper" on throttle all the time.

Sport-chrono modes "only" provides different chassis-settings and different use of gear-box.

 

[prj]

When you tune, do I assume right:

No LC necessary anymore, as the car uses it "all the time" (given the time brackets).

Car feels "sharper" on throttle all the time.

Sport-chrono modes "only" provides different chassis-settings and different use of gear-box.

Yes, everything correct.
Sport-chrono modes can be all changed to have different power settings as well, but it is not done like that from factory. The biggest difference is in the gearbox behaviour anyway, whether it shifts to 2nd and has to kick down or not.

 

[Emm]

Interested, just sent you an email .

 

[prj]

Looked a little into regen settings today.
From factory there's only 2 modes as far as the ECU is concerned (the Auto mode is a separate topic). On/off. There are 2 maps calibrated and 2 maps disabled.
It is possible to expand it to 4 modes, and also change recuperation amount based on drive mode.

Before someone yells at me - yes the recuperation feels different between the driving modes, but that is not due to the base amount - the base amount is always the same. The reason it feels different is because the antisurge damper (or torque filter) is calibrated differently in each mode, so in the Sport Plus mode the recuperation is faded in much faster than in Normal. Resulting in a stronger feel.
But after the fade-in is complete, all the modes have the same basic amount, which is fully adjustable.

I also wonder if one pedal driving could be achieved. I personally can't stand it, but it might be doable, or at least close. The creep control is going to put up a fight though, and in the very end you would still have to use the brake (from factory all regeneration is disabled below 3.5km/h and severly reduces below 10km/h).

I drive mine with regen on Auto all the time. I find it works quite well to slow down when a car is in front. The brakes are blended anyway, and the one pedal driving on Tesla is a giant hack because they couldn't manage to get brake blending to work. So they made the engineering failure a feature and spun it off like the next best thing.

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