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    997 GT2 Shifting Light

    Can someone confirm if the 2008 Gt2 gets this option ? or is it only in the 2009 Gt2s?


    Re: 997 GT2 Shifting Light

    Pretty sure it does - it is a bit of a waste of time anyway IMO, by the time it flickers you have usually hit the limiter, the limiter really needs to be a few hundred rpm higher the way this bad boy rips up the top end :)


    --


    2009 997 GT2 RS Tuning 542PS/736NM


    Re: 997 GT2 Shifting Light

    actually not.....it lights up wel before you hit the rev limiter. more in line with peak toqrue/rpm.

    i find myself always shifting later than the light comes on......


    --
    Speed has never killed anyone, suddenly becoming stationary... That's what gets you.

    Re: 997 GT2 Shifting Light

    intouch1:

    actually not.....it lights up wel before you hit the rev limiter. more in line with peak toqrue/rpm.

    i find myself always shifting later than the light comes on......

    I think I am talking about second/third gear, this is where you seem to get ~0.5s between shift light and rev limiter - higher gears are more relaxed but not used so often in the UKSmiley


    --


    2009 997 GT2 RS Tuning 542PS/736NM


    Re: 997 GT2 Shifting Light

    TB993tt:
    intouch1:

    actually not.....it lights up wel before you hit the rev limiter. more in line with peak toqrue/rpm.

    i find myself always shifting later than the light comes on......

    I think I am talking about second/third gear, this is where you seem to get ~0.5s between shift light and rev limiter - higher gears are more relaxed but not used so often in the UKSmiley

    If I am not mistaken, the light is timed to come on further ahead of the rev limiter trigger point in lower gears than in higher gears (at least in terms of the "rpm-delta" if not in terms of time), to allow for the different rates of acceleration in the various gears.


    --

    fritz


    Re: 997 GT2 Shifting Light

    fritz:
    TB993tt:
    intouch1:

    actually not.....it lights up wel before you hit the rev limiter. more in line with peak toqrue/rpm.

    i find myself always shifting later than the light comes on......

    I think I am talking about second/third gear, this is where you seem to get ~0.5s between shift light and rev limiter - higher gears are more relaxed but not used so often in the UKSmiley

    If I am not mistaken, the light is timed to come on further ahead of the rev limiter trigger point in lower gears than in higher gears (at least in terms of the "rpm-delta" if not in terms of time), to allow for the different rates of acceleration in the various gears.

     Is that in order to take into account the expected time until the driver has actually changed the gear or in order to get the best possible acceleration given the shape of the hp curve and the gearing Smiley


    Re: 997 GT2 Shifting Light

    MKSGR:

    .

     Is that in order to take into account the expected time until the driver has actually changed the gear or in order to get the best possible acceleration given the shape of the hp curve and the gearing Smiley

    Has to be the first, these make peak power right near the limiter in fact they really do need another few hundred rpm IMO, a 7300rpm limit would be nice Smiley


    --


    2009 997 GT2 RS Tuning 542PS/736NM


    Re: 997 GT2 Shifting Light

    MKSGR:
    fritz:
    TB993tt:
    intouch1:

    actually not.....it lights up wel before you hit the rev limiter. more in line with peak toqrue/rpm.

    i find myself always shifting later than the light comes on......

    I think I am talking about second/third gear, this is where you seem to get ~0.5s between shift light and rev limiter - higher gears are more relaxed but not used so often in the UKSmiley

    If I am not mistaken, the light is timed to come on further ahead of the rev limiter trigger point in lower gears than in higher gears (at least in terms of the "rpm-delta" if not in terms of time), to allow for the different rates of acceleration in the various gears.

     Is that in order to take into account the expected time until the driver has actually changed the gear or in order to get the best possible acceleration given the shape of the hp curve and the gearing Smiley

    Why should it be a question of "either / or"? Smiley

    If the "resources" available have been used to the optimum, then getting the best possible acceleration out of the available engine output involves accounting for the time required  by the driver to react to the light and to actually initiate the shift.  Smiley

    You regularly drive a GT2. Have you had any cause to doubt that?  Smiley


    --

    fritz


    Re: 997 GT2 Shifting Light

    fritz:
    MKSGR:
    fritz:
    TB993tt:
    intouch1:

    actually not.....it lights up wel before you hit the rev limiter. more in line with peak toqrue/rpm.

    i find myself always shifting later than the light comes on......

    I think I am talking about second/third gear, this is where you seem to get ~0.5s between shift light and rev limiter - higher gears are more relaxed but not used so often in the UKSmiley

    If I am not mistaken, the light is timed to come on further ahead of the rev limiter trigger point in lower gears than in higher gears (at least in terms of the "rpm-delta" if not in terms of time), to allow for the different rates of acceleration in the various gears.

     Is that in order to take into account the expected time until the driver has actually changed the gear or in order to get the best possible acceleration given the shape of the hp curve and the gearing Smiley

    Why should it be a question of "either / or"? Smiley

    If the "resources" available have been used to the optimum, then getting the best possible acceleration out of the available engine output involves accounting for the time required  by the driver to react to the light and to actually initiate the shift.  Smiley

    You regularly drive a GT2. Have you had any cause to doubt that?  Smiley

    Good question. I always asked myself how the shift light is programmed. Sometimes it feels that the light goes on a bit earlier than I would usually do the shift into a higher gear.


    Re: 997 GT2 Shifting Light

    "Just like the current 911 GT3 models, the new 911 GT2 features a shift indicator in the instrument cluster for the first time. Shortly before the maximum engine speed of 6,750 rpm is reached, an upward-facing arrow lights up in the rev-counter. During sporty acceleration using the entire rev range, the illuminated arrow requests the driver to shift to the next higher gear. The time at which the arrow lights up depends on the gear and is designed to enable the best possible acceleration."

    [Dr. Ing. h.c. F. Porsche]


    Re: 997 GT2 Shifting Light

     


    Re: 997 GT2 Shifting Light

    it lights up at peak horsepower.....higher up in the rev band you lose horsepower and therefore would accelerate slower.


    --
    Speed has never killed anyone, suddenly becoming stationary... That's what gets you.

    Re: 997 GT2 Shifting Light

    intouch1:

    it lights up at peak horsepower.....higher up in the rev band you lose horsepower and therefore would accelerate slower.

     That's actually the question I ask myself: does it light up at peak horse power - or is there a more complex formula behind this light (taken into account the gearing of the next gear, taking into account the delayed reaction of the driver, etc.)...


    Re: 997 GT2 Shifting Light

    MKSGR:
    intouch1:

    it lights up at peak horsepower.....higher up in the rev band you lose horsepower and therefore would accelerate slower.

     That's actually the question I ask myself: does it light up at peak horse power - or is there a more complex formula behind this light (taken into account the gearing of the next gear, taking into account the delayed reaction of the driver, etc.)...


    Marcus

    I think what you are alluding to here is correct... I have done some testing recently and as is quoted the shift point varies per gear. I changed exactly when "told" to by the shift light and the resultant acceleration seemed to be the best possible - a clever feature.....

    It seemed to be change slightly earlier in gears 1 to 3 then very close to the limit 4 and 5... makes sense I guess


    --


    2009 997 GT2 RS Tuning 542PS/736NM


    Re: 997 GT2 Shifting Light

    TB993tt:
    MKSGR:
    intouch1:

    it lights up at peak horsepower.....higher up in the rev band you lose horsepower and therefore would accelerate slower.

     That's actually the question I ask myself: does it light up at peak horse power - or is there a more complex formula behind this light (taken into account the gearing of the next gear, taking into account the delayed reaction of the driver, etc.)...


    Marcus

    I think what you are alluding to here is correct... I have done some testing recently and as is quoted the shift point varies per gear. I changed exactly when "told" to by the shift light and the resultant acceleration seemed to be the best possible - a clever feature.....

    It seemed to be change slightly earlier in gears 1 to 3 then very close to the limit 4 and 5... makes sense I guess

     Thanks for posting your observation on this Smiley


     
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