If you check either torque or hp delivery at any point in the rev range and compare an SC equiped car with a non SC car then the amount of hp and torque is identical. No difference regardless of whether SC is switched on or off.

Also the time taken to rev from 1000rpm to 7200 rpm and any two points between that you choose to measure are identical car to car. Again it's identical regardless of whether Sc is switched on or off.

The only thing that changes with SC on or off is the amount of throttle travel it takes to get there.

If any of this were different then Porsche would publish a different set or curves between the cars and charge a great deal more for the privilage.

 

I did laps at Sebring last month with my Porsche Club. I have a C2S w/ Sport Chrono and ended up turning it off because the throttle is way too sensitive on input in some of the corners.

Sport Chrono will not make your car faster on the street or laps on the track. Sport Chrono would be very useful to time laps and I got it because I wanted the shock settings and the seat/air/radio memory system.

 

As a Tip guy you are soooo right. It really changes the tip in a positive way. However when tracking I shift the tip manually anyway.

 

you keep saying this over and over. I hear you. I agree. It is because on a dyno where these plots are produced all measurments are taken at 100% throttle and at 100% we have all agreed that the SC and non-sc throttle graphs converge and nothing is different. When floored 100% both cars are identical, assuming egas isn't being effected by some other factor and the throttle is indeed open 100%.

if you find you lap times are faster w/o SC then by all means turn it off and enjoy the car...

just don't get mad when I drive past you exiting a turn LOL!!

dw

 

I don't know whether this concept is too complex for you to understand, but SC does not change the physical characteristics of the engine, except for throttle travel. So whether the dyno measures at 20% or 50% or 100% of the throttle opening (as oppposed to throttle pedal travel) and at whatever rpm you choose to measure at, there is no difference in torque or hp between an engine with SC on "Sport" and an engine without SC.

And again if you don't believe me ask PNA.

If a car is faster with SC on then it's because of PSM using a more liberal set of parameters before it begins to take control, and nothing to do with throttle travel.

 

thats awsome...yes I'm just to plain dumb to understand. I wish I could, but the lord just didn't bless me with such a high level of brain power.

whatever...there is really no need to start insulting people.

I've been designing and building professional race cars for decades. Many of the cars we build have about 1" of total throttle travel by design because it allows the driver to be on the gas more at an earlier point in the corner and tends to lead to faster lap times. Now you can argue that the time difference to get on full throttle with 1" or 3" is milliseconds...but most of the accomplished professional drivers that I have worked with prefer to have a shorter travel and run faster laps when they do for the reasons I have tried to explain above. The basic concept (which even I can understand) is that the faster you open the throttle the faster the acceleration, or put another way the more time spent on the track with more open throttle the faster the lap. Ideally if you could remain controlled through an entire lap at WOT the car would run at its max speed and lowest times. The closer you can get to this ideal the better...the faster the throttle opens the closer you are. Dyno plots are completely irrelevant.

This is thread is starting to get a bit heated and too personal for my liking. I could really care less if you agree or not or ever get my point. The bottom line is each driver needs a car that is most comfortable to them. If some drivers are more comfortable with a longer travel (virtual with egas) and can run faster lap times so be it.

I'm done...happy holidays.

dw

 

Nurburgring lap times, taken from http://www.supercars.net/PitLane?vie...ID=0&tID=10073 :

8:02 --- 153.858 km/h -- Porsche 997 Carrera S, PASM setting “Sport”, (Walter Roehrl WHEELS 06/ 04)

8:05 --- 152.907 km/h -- Porsche 997 Carrera S, PASM settino “Standard”, Walter Roehrl (WHEELS 06/04)

The -20mm suspension setting, not offered in North America, had the best time for the Carrera S:
7:59 --- 154.822 km/h -- Porsche 997 Carrera S, PASM setting “Performance”, (Walter Roehrl WHEELS 06/ 2004)

 

Thanks for the information but my question had to do with Sport Chrono lowering lap times, not PASM.

Your link references PASM but makes no mention of Sport Chrono.

PASM (Porsche Active Suspension Management) changes the dampening and compression characteristics of the shock absorbers and is part of the Sport Chrono settings but the Sport Chrono option is not necessary in order to have PASM.