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    Short 997 GT3 Information Summary

    Maximum rev range: 8400 rpm
    Power: 415 bhp at 7600 rpm
    Displacement: 3.6 l
    Maximum torque: 405 Nm at 5500 rpm

    Performance:
    0-100 kph (62 mph) in 4.3 seconds
    0-160 kph (100 mph) in 8.7 seconds
    310 kph (193 mph) Vmax

    Dry sump lubrification system with external oil distribution tank.
    Brake system with red coloured 6-piston calipers front and 4-piston calipers rear.
    350 mm sized brake discs front and rear, PCCB optional.

    PASM (Porsche Active Suspension Management) and TC (Traction Control) are standard.
    PASM offers several settings for added control.
    The Traction Control has some PSM functions for added safety.

    Wheel Sizes:
    235/35 ZR19 on 8.5J x 19 rims (front)
    305/30 ZR19 on 12J x 19 rims (rear)
    Rear hubs are fitted with 5 mm spacers.

    Unladen weight (DIN): 1395 kg (3069 lbs).

    Clubsport package available at request as a no-cost option.
    350 kph (225 mph US cars) speedo.
    9000 rpm rev counter with automatically illuminated upshift indicator.
    Grey dials with yellow markings.
    Soft leather (Alcantara) steering wheel.

    Re: Short 997 GT3 Information Summary

    Thanks RC,

    One dumb question and sorry if it's been answered already.

    Is the new GT3 in C2 shell or C4 shell?

    Re: Short 997 GT3 Information Summary

    Quote:
    Ron (Houston) said:
    Thanks RC,

    One dumb question and sorry if it's been answered already.

    Is the new GT3 in C2 shell or C4 shell?



    I'm afraid it is in C2 shell. The RS may sit in a C4 shell but right now I don't have anything official on the RS yet.

    Re: Short 997 GT3 Information Summary

    Looks like the c4 shell to me.

    Re: Short 997 GT3 Information Summary

    I think one of the reasons for the fantastic performance 0-100mph (besides more power and just a bit more weight) is that the new higher redline (8,400 compared to 8,200rpm) will allow slightly lower gear ratios, which will help acceleration...

    Re: Short 997 GT3 Information Summary

    Quote:
    Grant said:
    I think one of the reasons for the fantastic performance 0-100mph (besides more power and just a bit more weight) is that the new higher redline (8,400 compared to 8,200rpm) will allow slightly lower gear ratios, which will help acceleration...


    Exactly right, also peak HP and TQ occur at higher revs than the 996 GT3. Engine internals have gotta be practically indestructible, this is going to be one rev-happy baby (for we primitives I converted newton-metres > lb-ft).

    996 GT3
    Horsepower: 381 bhp at 7200 rpm
    Torque: 285 lb-ft at 5000 rpm

    997 GT3
    Horsepower: 415 bhp at 7600 rpm
    Torque: 299 lb-ft at 5500 rpm


    ....so the "sweet spot"-- midway point between peak HP/peak TQ goes UP from 6100 rpm on the former car to 6550 rpm for the 997 GT3......RC, any info if these new GT3 wheels are anything special as far as weight savings (a bit surprised but glad they engineered it using 19's) or any info on wheel weights, and when can I get a set ??? thanks to the person scanned images.

    Re: Short 997 GT3 Information Summary

    anyone else still surprised it didnt go to 3.8 liters? either way, that is an outanding peak torque value, and the HP value equallly impressive, this might be one of the alltime best production engines ever...

    Re: Short 997 GT3 Information Summary

    Are the CGT CF seats a no-cost option with the Clubsport Package or extra ???

    Re: Short 997 GT3 Information Summary

    Quote:
    bostonmini said:
    anyone else still surprised it didnt go to 3.8 liters?


    RS isn't here yet

    I still think the GT3RS and 997TTS could go 3.8L...

    Re: Short 997 GT3 Information Summary

    Quote:
    360bhp said:
    Are the CGT CF seats a no-cost option with the Clubsport Package or extra ???



    They do come standard in the CS spec.

    Re: Short 997 GT3 Information Summary

    Quote:
    03-turbo911 said:
    Quote:
    360bhp said:
    Are the CGT CF seats a no-cost option with the Clubsport Package or extra ???



    They do come standard in the CS spec.



    The CS-spec. GT models have always been supplied with one-piece shell seats, i.e., no reclining-back seats as an option.

    Re: Short 997 GT3 Information Summary

    Quote:
    fritz said:
    The CS-spec. GT models have always been supplied with one-piece shell seats, i.e., no reclining-back seats as an option.



    Looking at those racing shell drawings somebody posted recently, I can't hide the feeling that we're going to see two variants of the racing shells with carbon: a one piece shell variant for the clubsport versions and a version with a movable back seat for other Porsche models like the 997 Turbo for example. It would be great if the back seats would still remain usable with the second variant.

    Re: Short 997 GT3 Information Summary

    Reading through the copies of the brochure - seem to suggest Clubsport Package is free but the CGT seats appear as optional ie not free ? isnt this a bit of a rip off then !

    Re: Short 997 GT3 Information Summary

    Quote:
    360bhp said:
    Reading through the copies of the brochure - seem to suggest Clubsport Package is free but the CGT seats appear as optional ie not free ? isnt this a bit of a rip off then !



    The "CGT" seats are part of the clubsport package...hence: they do not cost anything extra IF you're going for the clubsport package.

    Re: Short 997 GT3 Information Summary

    Quote:
    360bhp said:
    Reading through the copies of the brochure - seem to suggest Clubsport Package is free but the CGT seats appear as optional ie not free ? isnt this a bit of a rip off then !



    It's a little unclear I'd say. Maybe it's just the poor translation by the marketing department but if you read it literally then it says the Club Sport is only available with the CGT seats, which by the way are an option (i.e. cost extra).

    Will the standard seats be the usual leather 997 sports seats, and any idea what the weight penalty will likely be between Club Sport and Comfort models?

    Re: Short 997 GT3 Information Summary

    Quote:
    Grant said:
    Quote:
    bostonmini said:
    anyone else still surprised it didnt go to 3.8 liters?


    RS isn't here yet

    I still think the GT3RS and 997TTS could go 3.8L...



    Feb. PANORAMA says it's 3.8 w/ 400 hp

    Re: Short 997 GT3 Information Summary

    Quote:
    RC said:
    PASM (Porsche Active Suspension Management) and TC (Traction Control) are standard.
    PASM offers several settings for added control.
    The Traction Control has some PSM functions for added safety.




    RC or anyone,
    I need enlightment, I thought TC and PSM were two different things.
    Isn't TC just an ASR couple to either an ABD or LSD?
    In the GT3 case, it's obviously be an LSD for performance's sake whereas the PSM is an electronic device that also acts on the brakes individually, essentially an ESP?
    In which case, it would erroneous (of obvious, whichever way you look at it) to state that TC has some PSM function?

    It would seem the GT3 TC is an upto date version of the tradionnaly TC that equipps the CGT but also the first Boxster S and first 996 (I remember my Boxster S had a TC off button, basically an ABD + ASR).

    Re: Short 997 GT3 Information Summary

    I'm confused.

    I hope the GT3 gets a LSD. If it does I suppose that TC will cut power/apply rear brakes if it's on regardless of the LSD. I suppose you can switch it off for full effect without interference. I can't see how PSM wll work with that unless they found a way to decouple the LSD electronically a bit like BMW's diff. on the M3.

    On second thoughts I'm still confused...

    Re: Short 997 GT3 Information Summary

    The GT3 will come with an LSD, there's no reason to assume it will not. TC will work quite logically with an LSD as would PSM. But the GT3 'doesn't' come with PSM, so there's no need to tie yourself in a knot over this.

    Re: Short 997 GT3 Information Summary

    Quote:
    john999s said:
    I'm confused.

    I hope the GT3 gets a LSD. If it does I suppose that TC will cut power/apply rear brakes if it's on regardless of the LSD. I suppose you can switch it off for full effect without interference. I can't see how PSM wll work with that unless they found a way to decouple the LSD electronically a bit like BMW's diff. on the M3.

    On second thoughts I'm still confused...



    TC does not have an effect on the brake.
    It cuts in power when rear wheels slip.
    The way to look at it is that TC is performance optimised whereas PSM is safety optimised.
    TC is very useful in the wet for example, and to a certain extent you can consider it a safety feature. I'm talking about TC in general here, not the one of the GT3 which might be different but I doubt it.
    You can switch it off like in the CGT and the first 996s to have no assistance at all (only ABS).
    And of course, TC can perfectly go with LSD.

    Re: Short 997 GT3 Information Summary

    Thanks!

    So the sequence would be:
    One wheels slips
    LSD transmits more power to other wheel
    Two wheels slip
    TC cuts power
    Grip restored.
    Switch it off and have fun.

    And we expect it to be a mechanical LSD. How 'tight' are they on the previous GT3's?

    Re: Short 997 GT3 Information Summary

    Quote:
    john999s said:
    And we expect it to be a mechanical LSD. How 'tight' are they on the previous GT3's?



    Not sure. Definitely more aggresive than on the normal road cars.
    I think 996/ 997 LSD are a very conservative 25/35 (bc of PSM) whereas the 996 GT3 was 40/60.

    Re: Short 997 GT3 Information Summary

    Where is the extra 35HP coming from when most tuners could only get 400HP from the 380HP motor?

    Re: Short 997 GT3 Information Summary

    I was wondering that too. We can only guess but the new exhaust routing, ram air effect via the gurney flaps and generally better breathing architecture must account for some of it? Perhaps half? But the rest? A full 3600cc hints that something has changed? Shorter stroke bigger bore for a couple of hundred more revs and bigger valves? Who knows?

    Re: Short 997 GT3 Information Summary

    Quote:
    360bhp said:
    Reading through the copies of the brochure -



    What brochure are you reading?

    Re: Short 997 GT3 Information Summary

    Gurney flaps-I am talking rubbish. I meant the intakes on the rear lid. Sorry.

    Re: Short 997 GT3 Information Summary

    Quote:
    john999s said:
    So the sequence would be:
    One wheels slips
    LSD transmits more power to other wheel
    Two wheels slip
    TC cuts power
    Grip restored.
    Switch it off and have fun.


    Not exactly. LSD keeps the rear axle locked all the time, unless you are turning in a tight enough corner (exceeding the torque differential required to make the clutches slip to allow the rear wheels to turn at different speeds).

    So, it is very rare that one wheel would ever just spin. And if it did, the other wheel would not begin to transmit more power (it would be transmitting the same amount of power throughout the incident). What you described is the way a torque-biasing diff (like Quaife) would work. A clutch type is supplied with all the Porsche cars with LSD.

    If there is wheel spin, it is almost always from both rear wheels on a GT3. When TC comes on, it will first cut power to the motor and then apply the rear brakes if necessary. Braking one rear wheel will have the effect of braking both rear wheels, since the LSD effectively makes it behave like a solid rear axle (no differential).

    This is why PSM doesn't work with such a diff, you can't brake one rear wheel without also braking the other...

    Re: Short 997 GT3 Information Summary

    Quote:
    Grant said:
    Quote:
    john999s said:
    So the sequence would be:
    One wheels slips
    LSD transmits more power to other wheel
    Two wheels slip
    TC cuts power
    Grip restored.
    Switch it off and have fun.


    Not exactly. LSD keeps the rear axle locked all the time, unless you are turning in a tight enough corner (exceeding the torque differential required to make the clutches slip to allow the rear wheels to turn at different speeds).

    So, it is very rare that one wheel would ever just spin. And if it did, the other wheel would not begin to transmit more power (it would be transmitting the same amount of power throughout the incident). What you described is the way a torque-biasing diff (like Quaife) would work. A clutch type is supplied with all the Porsche cars with LSD.

    If there is wheel spin, it is almost always from both rear wheels on a GT3. When TC comes on, it will first cut power to the motor and then apply the rear brakes if necessary. Braking one rear wheel will have the effect of braking both rear wheels, since the LSD effectively makes it behave like a solid rear axle (no differential).

    This is why PSM doesn't work with such a diff, you can't brake one rear wheel without also braking the other...



    Thanks for that Grant.
    My mistake, I thought a traditionnal TC didn't interfere on the brakes but only the engine. I was wrong.

    Re: Short 997 GT3 Information Summary

    GT3 Brochure Scans, in case you havent seen it yet.

    http://bimmer.roadfly.com/bmw/forums/m-lounge/7465054-1.html

    Re: Short 997 GT3 Information Summary

    BUT 997s with -20mm/LSD has PSM

     
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