It definitely feels like I am accelerating faster but a salesman told me that it actually does not actually affect performance just perception. If it is indeed advancing throttle response, isn't it adding performance? Love to hear from those that are more technically saavy than me on this.

 

It simply gives you a more aggressive throttle response. In short, you don't have to push the accelerator down as far to get the same throttle position. To prove it to yourself select cruise control, and place your foot on the throttle, and then click it off. You can feel the pedal move but there is no change in the car's power. For those of you with PSE is turns that on as well.

 

Also gives you a hard rev limiter as oppsed to a soft(I forget what this means lol) It makes your PSM less intrusive as well. Basically you can slide the car before it kicks in. Oh, and dont forget the really nifty stopwatch ; )

 

Also adds seat memory and other memory to 3 presets that can be activated my the car keys.

 

as others have said. its much like the m3's sport button in terms of its throttle sensitivity.

 

On the 997TT's, it also adds "Overboost", raising boost on the turbos to 1.2 bar for 10 seconds.

 

This is perhaps the most debated subject on the forums. Do a search and you can read about SC until you want to scream.

For the 997, 997s it does not give any more performance... Increasing PSM limits does nothing, really. PSM does not intrude as it is on the base car - you can do 2 or 4 wheel drifts, rotate the car, etc. without PSM ever turning on. If, however, you do something really wrong, it will kick in (I've experimented with this on street and track). So to me, I wouldn't want a different PSM - either it's on or it's off as with the base car.

All reports I've read or heard from guys on the track agree that the sport throttle map is worse than the stock one. It's too jumpy, just like the one on my E46 M3 was. The stock throttle map is fine - linear and easier to modulate.

 

PSM is really awesome...it really stands for Please Save Me! If you drive the car correctly at the limits on the track PSE never intrudes.

 

That is true. I tried with it on and off at Lime Rock this spring and it never got in the way. I actually had to try to make it kick in, which is a testiment as to how well Porsche designed it. Much better than DSC was on the BMW. Keep it smooth, do your 4-wheel drifts trying to eek out every bit of performance out of chasis and tires, and it will never get in the way. But hit some invisible fluid, it'll help straighten you out. With enough experience, you don't need the help - you can correct on your own - but it's one of those tools that's nice to have in the box...