Taycan 4S tuning - hypothetically

[or1]

The performance and equipment levels are a matter of Porsche deciding on a set of price points and then defining the configs so that each model defends its price well enough. I am not at all upset that they find they can differentiate with firmware instead of hardware in some cases. If every difference had to be hardware-based, there would have been fewer alternatives the way production is done nowadays.

Actually, I find it satisfying that I have turbo hardware without "having paid for it". That Porsche earned a little less on my car than if I had bought a turbo is not troubling me.

That there is more capacity for performance increases later without undue thermal load is also nice - if Porsche would offer it at a suitable price, I might take it. Not for launch, but if it was easily accessible when driving.

Sponsored

 

[CxM]

It translates to:

Performance increase to 620 hp / 830 Nm

• Adapted software and raising the Vmax limit
• Increasing the maximum output of the battery power by up to 150 amperes ( "overboost function" permanently active )

I assume this means it will always have access to a max 620 hp, outside of just launch mode?

 

[okkotonushi]

Yes

 

[whitex]

I'm not surprised. I deal with encrypted code or better, we have to encrypt/decrypt it. The problem is that it's encrypted in real time and sent to the client on boot and unencrypted in memory in real time so the code actually runs. This means that mitm is possible no matter how strong the encryption is because it has to be decrypted at some point by the app itself. You can obfuscate it and make someone's life miserable but adding heavy encryption is just a shot in your foot because it lags the execution.

Then again, I know a certain multi billion software company that shall not be named that encrypted one of their apps with a cheap $50 off the shelf commercial encryption. Needless to say it took an evening to defeat it.

Never assume big companies live up to their reputation.

Depending on your security design goals, there are secure ways of doing things you describe. What is considered secure depends on what you are trying to protect against whom, and what the cost of breach is. Perhaps the MITM attack you are eluding to here is between the CPU and RAM chips, but that might me out of scope for the security of your design. You could also mitigate that with a chipset which encrypts/decrypts specific RAM regions content on-the-fly if that was in scope - more expensive hardware if it's worth it for you to defend against someone who would have the equipment to snoop memory buses, or substitute their own FPGA based RAM to syphon the data. Or you could mitigate against the attack by ensuring that any information gained from such a fairly expensive attack is only useful to hack that one device, rather than "break one, break all".

I don't know many details of your design, but bottom line is that your solution should be designed to satisfy your security goals. Everything is hackable, especially with physical access to the device. The key is to make the hacking significantly more expensive than the benefit from it would be. You always start with, what are you protecting and from whom.

 

[tchavei]

Depending on your security design goals, there are secure ways of doing things you describe. What is considered secure depends on what you are trying to protect against whom, and what the cost of breach is. Perhaps the MITM attack you are eluding to here is between the CPU and RAM chips, but that might me out of scope for the security of your design. You could also mitigate that with a chipset which encrypts/decrypts specific RAM regions content on-the-fly if that was in scope - more expensive hardware if it's worth it for you to defend against someone who would have the equipment to snoop memory buses, or substitute their own FPGA based RAM to syphon the data. Or you could mitigate against the attack by ensuring that any information gained from such a fairly expensive attack is only useful to hack that one device, rather than "break one, break all".

I don't know many details of your design, but bottom line is that your solution should be designed to satisfy your security goals. Everything is hackable, especially with physical access to the device. The key is to make the hacking significantly more expensive than the benefit from it would be. You always start with, what are you protecting and from whom.

Correct. It's always based on "good enough to deter 99% of bad ppl" never 100%

 

[okkotonushi]

Anyone tried the mod now?

 

[mcr21]

Would have been cool if you could activate the equivalent of launch control for a few seconds when already at higher speeds, i.e. provide an acceleration boost on the highway etc.

 

[okkotonushi]

I used the chance to test the tuning in real. HGP had an Taycan 4S for the mod this week and i called them if it is possible to check the mod.

To make it short: I was surprised how impressive the tuning is. It’s worth it ?. Car is better in overall acceleration, you always have power independent of the actual speed.
If you have the battery plus option you would not harm anything because you are always below that what Porsche is doing in the turbo s. So, no risk for the battery and the engines are are safe as well. I’m not a journalist so sorry for the bad description. I think it’s worth it and will save money now to do it in the future.

 

[Porsche-Guru]

I used the chance to test the tuning in real. HGP had an Taycan 4S for the mod this week and i called them if it is possible to check the mod.

To make it short: I was surprised how impressive the tuning is. It’s worth it ?. Car is better in overall acceleration, you always have power independent of the actual speed.
If you have the battery plus option you would not harm anything because you are always below that what Porsche is doing in the turbo s. So, no risk for the battery and the engines are are safe as well. I’m not a journalist so sorry for the bad description. I think it’s worth it and will save money now to do it in the future.

Is there any detail on their website (or other papers) about how much th improvements are... or details about cost, how much time it takes to do this mod, is it self DIY or does it need the car to be taken to them.

I'm getting my 4S soon and would probably look to getting this done.

 

[bsclywilly]

If you have the battery plus option you would not harm anything because you are always below that what Porsche is doing in the turbo s. So, no risk for the battery and the engines are are safe as well.

@okkotonushi I’m curious in your conversations with them if they explained at all whether motor and inverters become a limit on longer durations like at the track? I’m not concerned about the battery as you explained that discharge rate is no more than a turbo but on the 4S, when pushed to thermal limits is the battery still the limiting factor and hits thermal limits first or is it the smaller rear motor? Or have they even tested it to the point that thermal limits are reached? I did not get a response from Ute for these questions over email so maybe you have better luck. Thanks.

 

[whitex]

Is there any detail on their website (or other papers) about how much th improvements are... or details about cost, how much time it takes to do this mod, is it self DIY or does it need the car to be taken to them.

There is a video explaining how to take out the ECU yourself, then ship to them for modification, then put it back in.

 

[Porsche-Guru]

There is a video explaining how to take out the ECU yourself, then ship to them for modification, then put it back in.

Link ?

Would you mind posting the link or refer to the forum post. Thanks…

 

[whitex]

Link ?

Would you mind posting the link or refer to the forum post. Thanks…

It's been a while since I watched it, I think this is it (it's linked on their main page):

 

[Raphie]

So, 7k€ for permanent boost + 1.5cm extra lowering profile?

 

[Rik_CT4s]

So, 7k€ for permanent boost + 1.5cm extra lowering profile?

For a GTS definitely worth it...for the 4s I will wait a bit, matter of time before this will be offered by numerous tuners.
More important (to me) is warranty...would Porsche take their hands off one tuned?
Cheers

Sponsored