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    Sport Chrono & PSM

    I've always thought that the best reason to get the sport chrono pkg was the intermediate PSM setting in sport mode: not as intrusive as PSM can be at times, but still there to help you out a little if you get into real trouble. I couldn't find any references in the sport chrono threads on the different PSM setting, so I'd like to hear what you who are all blessed with sport chrono think: is there a noticeable difference in when PSM intervenes in sport vs normal mode? Is the sport PSM setting too crazy (ie. once it kicks in it's too late) or too intrusive?

    Re: Sport Chrono & PSM

    The dealer is telling me the Chrono will not affect the performance one way or another and it is to clock your car. The PSM will make your car rev more aggressive, better sound and faster and harder suspension. If you drive the car hard with the PSM off, it will engage automatically, true or not I don't know as my car has only 500 miles on it.

    Re: Sport Chrono & PSM

    Quote:
    edz61 said:
    The dealer is telling me the Chrono will not affect the performance one way or another and it is to clock your car. The PSM will make your car rev more aggressive, better sound and faster and harder suspension. If you drive the car hard with the PSM off, it will engage automatically, true or not I don't know as my car has only 500 miles on it.



    I think you are right about Sport Mode not affecting performance numbers, but the car may feel more sporty since the throttle response is more acute. In my opinion, this is just crap - extra cash from my hard earned pocket to get the throttle to respond more to any push of the gas - waste. Plus, if you like to heel'n'toe, the diferent throttle map could theoretically throw you off (something else I'm interested in hearing about). As for the lap timing, my impression is that if you are really driving hard, hitting that stalk control twice at each lap is just too cumbersome. I don't think I'd ever make use of it. Then there's the wart, which disturbs the lines of the classic 911 dash IMO. So the intermediate PSM setting seems to be the best thing going for the Sport Chrono pkg to me - that is if the intermediate PSM seting is of any value . . .

    As for how PSM functions when off in a 997, I don't really know either. In my 996, if PSM is off, as soon as ABS are engaged, PSM will once again intervene as well.

    Re: Sport Chrono & PSM

    The PSM is less intrusive but still there, it allows greater degree of spin before it kicks in, specially at lower speeds its more permisive, and less at higher speeds, were the margin of error is less.

    The throttle response of sport chrono makes heel-toe much easier, much better than the stock one. So if you like to heel and toe, sport chrono is a must as well.

    Basically, for its price, I recomend it. I don't know if you can retrofi it later on if you wanted to.

    Re: Sport Chrono & PSM

    Well, on day by day driving I would hardly do any heel and toe, unless I am on a winding road and/or track racing someone. I do give the car a little gas every time I down shift so the engine RPM match the wheel so the tranny does not take too much abuse. Now as for the PSM, I am not crazy about it either. I like cars simple, step on it and let the son of a gun go

    Re: Sport Chrono & PSM

    From Porsche.................

    The new 911 hails the advent of a new generation of Porsche Stability Management (PSM).

    New ABS sensors offer the input for this superior management and control, determining wheel rotation no longer by conventional pulse wheels, but rather by multi-pole seals fitted directly on the wheel bearings.

    The improved signal obtained in this way can now be used for more precise processing and control purposes, linear solenoid valves serving to adjust brake pressure with almost infinite precision, that is much more precise than with conventional shaft valves.

    This greater performance is matched by an appropriate decrease in weight, a new hydraulic pump serving to build up the brake pressure required so quickly that the system no longer needs a pre-charging pump with all its connections, which reduces system weight by 3 kilos or 25 percent.

    To ensure even more agile handling , PSM intentionally intervenes at a later point at low speeds of up to approximately 50 mph.
    And as in the past, the driver still has the option to switch off PSM, meaning that it will only be active when he applies the brakes.

    The difference is that now the system is only reactivated by forcefully pushing down the brake pedal and thus exceeding the ABS control threshold on at least one front wheel.

    This gives the sporting driver greater freedom in his style of motoring, since PSM no longer intervenes when applying the brakes only slightly, thus allowing him to brake even more smoothly and with a neutral effect in bends.

    The program is activated by the sports button in the centre console, varying the:

    gas pedal control lines
    engine speed limiter
    dash-pot on the throttle butterfly
    PSM (Porsche Stability Management)
    PASM (Porsche Active Suspension Management) and Tiptronic S as required by the driver.

    The E-gas control line is switched to a steeper configuration restricted in models equipped with Tiptronic S to the manual mode.

    The throttle butterfly will respond even more quickly to movements of the gas pedal, and the driver will enjoy an even more spontaneous response from the engine.

    Should the driver furthermore keep his foot on the gas pedal without shifting gears, the engine speed limiter in gears 1 -5 will intervene far more abruptly than in standard trim, meaning that the engine responds directly to the gas pedal up to the maximum speed limit.

    Dash-pot response is less oriented to motoring comfort, the throttle butterfly closing faster whenever the driver takes his foot off the accelerator to provide an even more dynamic, racing-like driving experience.

    The operation and intervention of Porsche Stability Management also changes in response to the sports button, providing greater agility and driving dynamics.

    Accelerating out of a bend, for example, the car is even faster and more dynamic thanks to the higher anti-spin control threshold allowing more slip on the drive wheels when giving gas.

    The system thus consciously accepts greater swerve action at the rear - particularly on slippery surfaces - without endangering driving safety.

    The other PSM activation thresholds are likewise raised to a higher level allowing a bigger deviation between the actual and the desired movement of the vehicle before PSM cuts in.

    The result, clearly, is greater agility when driving to the limit in lateral dynamics.

    Raising the ABS intervention limits, in turn, the system allows the driver to apply the brakes with more neutral behaviour when entering a bend.

    A further point is that PSM allows more drag momentum from the engine whenever the driver takes his foot off the gas pedal, ensuring a smoother load change for taking bends with a tighter angle and in more dynamic style.

    And for even greater agility, all the driver has to do is switch off PSM with the sports mode active.

    Porsche Active Suspension Management also switches automatically to the sports program with harder bumper control.

    The car thus steers even more spontaneously into bends, body movements are significantly reduced, and road contact is improved accordingly.

    With a "softer" suspension being advantageous on slippery surfaces such as wet or snowbound roads, on the other hand, the driver is able, pressing the PASM button, to set the car to its normal damper position even when the sports mode is active.

    Re: Sport Chrono & PSM

    Quote:
    edz61 said:
    The dealer is telling me the Chrono will not affect the performance one way or another and it is to clock your car. The PSM will make your car rev more aggressive, better sound and faster and harder suspension. If you drive the car hard with the PSM off, it will engage automatically, true or not I don't know as my car has only 500 miles on it.



    Never ceases to amaze me at how uninformed dealers can be about the cars they sell--Sports Chrono isn't just to clock your car. In fact the lap timer is the one feature of Sports Chrono I wouldn't miss if it wasn't there.

    Sounds like your dealer has some 997's without sports chrono he'd like to sell you.

    Re: Sport Chrono & PSM

    How does activating the Chrono help you car perform better. I do have the chrono and PSM/sport. When I turn the sport/PSM on the car becomes a different animal. But how does the Chrono help and how do you make it help, by actiavting it????

    Re: Sport Chrono & PSM

    David S: very nice, thank you for sharing. So tell me this if I want to push my car to the limit from a dead stop, I turn the PSM/Sport on and what will I do with the Chrono?

    Re: Sport Chrono & PSM

    One example of the use of Sport Chrono ... It was wet today on the streets, and a friend of mine just picked up a GT3 so, on the way back from dinner we were goofing around, I pressed the Sport Chono ON in my 997S at a stop light and from a dead stop I took off and the wheels of my 997S were still spinning and the back end still snaking even when up through second gear!. You can't do that with normal PSM setting (though the rear LSD of the -20mm probably helps too), and same with tight city turns in first/second gear to play around with the back end a bit.

    In normal PSM in those same cirscumstances it will kill your throttle completely right in the middle of it and looks quite foolish...

    Re: Sport Chrono & PSM

    Thanks - that's really good to know. I will get sport chrono for sure then.

    Re: Sport Chrono & PSM

    Love that pic
    Carlos , really smooth..

    throt..

    Re: Sport Chrono & PSM

    It was taken at the gas station on the way back, the attendant (the guy in red in the pic) was surprised by the thrist of the GT3, he needed to pump 86 Euro of gas to fill the tank!!

    Re: Sport Chrono & PSM

    Quote:
    Carlos from Spain said:
    You can't do that with normal PSM setting (though the rear LSD of the -20mm probably helps too), and same with tight city turns in first/second gear to play around with the back end a bit.

    In normal PSM in those same cirscumstances it will kill your throttle completely right in the middle of it and looks quite foolish...


    Yes, I looked "foolish" quite often with my 996C2 Glad the Sport Chrono is so much more forgiving!

    How did you like your friend's GT3 Mk1?

    Re: Sport Chrono & PSM

    Loved it! GT3 is my favorite car in the Porsche model line, if it weren't for the lack ground clearance (can't park it in my garage), no rear seats, and no PSM... I would only be driving GT3's

    Re: Sport Chrono & PSM

    Carlos: The Sport mode changes everything but the actual Chrono, the big wart on the dashboard how does that help anything when activated? It should do nothing but clock the car, right? Cool pic, how does your car stand up against the GT3. On the street I don't think the Gt3 is any faster but on track that is a different story. No offense but GT3 is not a pretty car, never liked them, but love the way they drive

    Re: Sport Chrono & PSM

    Quote:
    edz61 said:
    Carlos: The Sport mode changes everything but the actual Chrono, the big wart on the dashboard how does that help anything when activated? It should do nothing but clock the car, right? Cool pic, how does your car stand up against the GT3. On the street I don't think the Gt3 is any faster but on track that is a different story. No offense but GT3 is not a pretty car, never liked them, but love the way they drive



    You know what? I have never activated that clock yet, nor bothered even reading about how to use it Its useless really, its just a chrono-clock that you can't even see, theres is the PCM screen for that, but still useless. The good thing about Sport Chrono Pack is the throttle response and less intrusive PSM setting.

    As to the GT3, its a MkI-GT3 so even though I have not compared his side to side, but mine is more efficient in the street and at the track they should be even. The difference is that the GT3 is a bit more fun at the track and also allows further track modifications. So for a track car (which is the main purpose of this red GT3) even though the 997S may be even faster in some cases, the GT3 is the better choice.

    Re: Sport Chrono & PSM

    I only activate it for 2nd at night time so the light would come on. As for the GT3, it is just ugly but it's a gr8 car. Now I think RC or someone else on the forum mentioned once that the 997S is faster than the Mk1-GT3 but not a match for MKII.

    Re: Sport Chrono & PSM

    I think the MkI GT3 looks good, but that the MkII GT3 looks great. Neither look bad to me.

     
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