For us non "S" owners that would like to mod our cars and add some power, we are losing out on 7000-7200 rpms that the tts comes as a standard shift point. Is anyone working on it?

I currently have the GIAC Stage 2 and has not changed the shift point.

Hopefully GIAC and Austin can get back to us on a higher rev limiter and if its safe to run.

 

In TTS Porsche assure it is safe to hit 7200 no problems, noise is special at 7200!

 

This goes back to the question of whether the difference between the two motors is just software. If it is just software, then it should be easy to solve. If the internals were different, then maybe not. I would think that if the internals were different (reinforced crank, forged vs. cast pistons, etc.) we would know it. But that's a guess.

 

If the car shifts 200 RPM higher, that is likely something controlled by the PDK version, which likely differs from Turbo to Turbo S.

 

According to an article in Christophorus magazine states that the only difference between the S and the non S is the programming of the ECU. the internals of the motor, size of the turbos are the same.

 

If that was true, then can someone please explain why even after the GIAC tune, the horsepower on the Turbo S is still more than the Turbo?

 

One of the inner inlets in the 991 turbo s exhaust is slightly wider in diameter compared to the 991 turbo if I am not mistaken.
Wonder if that is the reason why the s sounds better than the normal turbo. If they accelerate under load the s sounds better
than the turbo.

 

I was told the system is same on both cars. Also put same AM system on both and power difference is still there.....so can't be this.

 

Interesting. Whatever it is, all I know that with every type of tune out there, the end result is that the Turbo S still produces slightly more power than the Turbo.

 

Check Dec 2013 Excellence Magazine Pg 62 Second column, second paragraph. The S and non-S have the same motors only difference is ECU programming.

 

I know what Porsche has said officially, but it still doesn't explain the fact that with an aftermarket tune, the power difference still exists between the Turbo and the Turbo S, even though the tune is running the same boost for both.

 

Where are you seeing that there is more power on dyne pulls? Not disagreeing, I just always see one dyne plot on ECU sites.

 

I agree seems very strange if it's just an ECU difference. i guess you could start looking at part numbers for turbo and turbo S. intercooler, pistons, heads, cams, everything to possible find a difference. I thought it would be something simple like a slight increase in compression. Almost bought a turbo thinking after the warranty I could just reflash the ECU to get the extra hp/tq.

 

If I remember correctly I believe Stef from Europipe mentioned that the S had a slightly different angle on the turbo vanes compared to the regular turbo. I'm not sure about anything else but I would think their is some other minor differences internally.

 

Hi,

I work for a Porsche dealership and stumbled upon you question on my lunch break.

I became curious as to the answer, and although I am not sure of what the differences are, what I can tell you is that a 991 Turbo replacement engine has a differente code than a 991 Turbo S replacement engine,

Hopefully I have been of help,

Good luck.