Part 3: The Quest for the Perfect Tune

[iReminisce]

Nice, where in FL?. I would love to see the 60-130mph if you can find a spot!.

I'm in Miami, FL, and the roads have quite literally been wet or downpour minor flooding all month every time I have a moment to go for a ride. Will try to get some numbers this week.

Sponsored

 

[Vonlutt]

I've been following these threads for a few weeks and have read most of the comments but may have missed this being answered. I picked up my 2025 Taycan GTS this weekend and I am considering making this purchase (waiting on the BMW ENET Cable to be delivered in the next couple of days).

Since I purchased it outright, from your (or anyone's) opinion what kind of impact will this modification have on the battery or power train long term? I won't be flooring it/driving it very hard, and I can't imagine I would have really used the launch feature at all, so if I am driving it pretty tamely can I expect any real degradation from this upgrade on the battery or power train? Obviously it will be driven a little bit harder having this accessible, but just curious if this will cause any unexpected impacts to long term battery health or wear and tear?

Same question for range -if I am driving it tamely in Normal will there be any additional impact to range?

Thank you for your time.

 

[prj]

I've been following these threads for a few weeks and have read most of the comments but may have missed this being answered. I picked up my 2025 Taycan GTS this weekend and I am considering making this purchase (waiting on the BMW ENET Cable to be delivered in the next couple of days).

Since I purchased it outright, from your (or anyone's) opinion what kind of impact will this modification have on the battery or power train long term? I won't be flooring it/driving it very hard, and I can't imagine I would have really used the launch feature at all, so if I am driving it pretty tamely can I expect any real degradation from this upgrade on the battery or power train? Obviously it will be driven a little bit harder having this accessible, but just curious if this will cause any unexpected impacts to long term battery health or wear and tear?

Same question for range -if I am driving it tamely in Normal will there be any additional impact to range?

Thank you for your time.

No to both of those questions.
The motor and battery loads stay within the limits allowed by Porsche. Only the commercial limits are removed.

Range is not affected.

 

[Vonlutt]

No to both of those questions.
The motor and battery loads stay within the limits allowed by Porsche. Only the commercial limits are removed.

Range is not affected.

Thanks for the prompt reply and taking time to answer. I'll have an order in to you in the next week or so. Thank you

 

[MidwestPCar]

@prj and others
I have a question about the anti-surge dampers alone. I read through all 21 pages of forum text before asking. I generally drive in the city in my 2020 4S, in tight traffic. The only small downside I need improved is what I perceive as a "delay" on acceleration. I presume it's because of the anti-surge dampers. It feels like the car is "laggy" to pedal input (albeit admittedly more refined). When I try to close a spot in traffic, there's a gap before I get there.
In the older ICE cars (BMW and Porsche), there were modules (Sprint Booster, etc.) which in addition to changing pedal response rate, also claimed to eliminate this "programmed delay (for refinement)". I found this to be true. Even at base mode, just eliminating this "programmed delay" seemed to turn it into a more responsive car.

Does the tune significantly reduce this delay? How much does this tune help/gain (theoretically) from just eliminating the "delay" vs eliminating power limits (which has had lots of discussion)?

My use case is clearly different from those wanting faster 60-200, I want a more "responsive car", for e.g. in high speed traffic, when keeping tight or merging with moving traffic, or when going from stop sign to the next.

Thanks

Another detail I noticed - for an EV the car has a significant amount of throttle delay. It takes 0.2-0.4s for the power to fully come in depending on drive mode.
This is caused by a set of modules called "Anti-surge dampers". One is on the powertrain torque path and another on wheel torque path.

They have two tasks:
a) Protect the drivetrain from excessive lash and bucking
b) Add refinement to the driving characteristics of the car

The easy way out is to just disable the torque filtering. However, this results in jerky behaviour in normal driving and is also unnecessarily hard on the drivetrain.

Luckily, the ASG has a special module to combat this throttle delay, which is disabled and not calibrated from factory. The English translation is "unfiltered driver request in case of pre-tensioned drivetrain".
Essentially you set a minimum forward torque and a maximum torque request gradient. If the minimum forward torque is fulfilled (the drivetrain is tensioned) and the torque request gradient (how fast you mash the loud pedal) exceeds the preset value, the filter is bypassed.

After calibration of the modules the end result worked exactly as expected - car drives refined like stock in normal situations, but when you make a sudden throttle change the delay is greatly reduced.

When you tie all this together with setting the launch bit + damper hardening and TC action plus some power increase, the end result is quite impressive compared to stock when you floor the car at speed.

 

[prj]

1. Sprint booster
The only thing this does is cheat the accelerator pedal input, so when you press e.g. 20% it presses 40% for you. Nothing else. It does not take care of any delay or accomplish anything that you couldn't do by mashing the throttle harder.

2. The Taycan slow response is due to two things:
a) The Gearbox - If you have sport chrono, then configure individual mode to have everything in comfort and the drive in sport. This will make the gearbox stay in first gear and will give you a much better response.
b) The anti surge damper delay - tune takes care of it on sharp throttle movements and gives you better response, but compared to a) this is a small difference.

If you are happy with the power, then try a) first, you might not need to do anything else.

 

[MidwestPCar]

1. Sprint booster
The only thing this does is cheat the accelerator pedal input, so when you press e.g. 20% it presses 40% for you. Nothing else. It does not take care of any delay or accomplish anything that you couldn't do by mashing the throttle harder.

2. The Taycan slow response is due to two things:
a) The Gearbox - If you have sport chrono, then configure individual mode to have everything in comfort and the drive in sport. This will make the gearbox stay in first gear and will give you a much better response.
b) The anti surge damper delay - tune takes care of it on sharp throttle movements and gives you better response, but compared to a) this is a small difference.

If you are happy with the power, then try a) first, you might not need to do anything else.

Thanks for the response.
Unfortunately I don't have sport chrono. Does putting it in sport mode via the button essentially accomplish the same responsiveness? (perhaps I can combine that with manually switching suspension mode)

 

[prj]

Thanks for the response.
Unfortunately I don't have sport chrono. Does putting it in sport mode via the button essentially accomplish the same responsiveness? (perhaps I can combine that with manually switching suspension mode)

Yes, it does. But I think without Sport Chrono you have to do this every time (push the sport button and then put the dampers to comfort).

It is also possible to remap the ASG so that it holds gears as high in normal as it does in sport, I have done that for someone in the past. And then range mode is always 2nd gear.

 

[MidwestPCar]

Yes, it does. But I think without Sport Chrono you have to do this every time (push the sport button and then put the dampers to comfort).

It is also possible to remap the ASG so that it holds gears as high in normal as it does in sport, I have done that for someone in the past. And then range mode is always 2nd gear.

Thank you. Something for me to ponder.

 

[prj]

Here's a 100-200 km/h from a roll on a J1.1 Taycan 4 Cross Turismo.
Before (13.99s):

After (6.85s):

 

[taycan_bud]

Impressive, half time with the tune

 

[prj]

J1.2 Taycan 4S put down 900 WHP at 70% SoC on a dynojet with our tune.

 

[Mr.Smith]

J1.2 Taycan 4S put down 900 WHP at 70% SoC on a dynojet with our tune.

Was this an AWD Dyno? How much is the real HP to the "Crank" when you factor in drive trian loss?

 

[prj]

Was this an AWD Dyno? How much is the real HP to the "Crank" when you factor in drive trian loss?

AWD of course, how else.

The dyno showed 900 at the wheels.
The motors produce 940 PS, I have this info from datalogging the motors themselves, so that is the 100% accurate number.

We had a J1.1 4S on the dyno as well in Greece:

That shows 770PS at the crank, but I know from the motors it makes 730 PS.
Ignore the torque figure, impossible to get that right on the dyno because the front and rear RPM is different and the dyno gets the torque by dividing the power by the rpm (well a bit more complicated than that before someone corrects me).

 

[Emm]

J1.2 Taycan 4S put down 900 WHP at 70% SoC on a dynojet with our tune.

Quick question: Is the figure 800 PS for the J1.1 GTS the actual output from the combined engines, or is it the output measured at the wheels (like the J1.2 4S above; hopefully this :–)? If the latter, what is the actual engines output; if the former, what is the estimated output at the wheels?

Sponsored