Porsche's new philosophy with the GT3 according to AP
04-03-2017, 02:02 AM
#181
Race Director
04-03-2017, 02:11 AM
#182
Race Director
I find that PDK-s is so intuitive, that I could never shift the paddles in as accurately/timely fashion as the system does when left alone, and manual is another planet all together. but it's still so much fun to shift manually, and nobody pays me to go faster..
04-03-2017, 02:34 AM
#183
04-03-2017, 08:05 PM
#185
Three Wheelin'
Originally Posted by armbar
Here is a good video that I hope will contribute to the discussion:
04-03-2017, 08:45 PM
#186
^^^^
power is directly proportional to torque multiplied by rpm
The action of a piston turning a crankshaft generates torque (governed by compression ratio and the lever length of the crank - hence lb and feet) the number of times it does this in a defined time defines the amount of power produced.
You will notice that the first to second gear change point in all Porsche sports cars, after a redline shift in first, will be at the far left point of maximum torque developed after variocam plus has become active e.g. always above 4000 rpm but with some subtlety between different models with different gearing, outputs and redline e.g. for a GT3 the run in second will start from around 5500 rpm..........for a GT4 or base Cayman this will start from around 4500 rpm
To achieve maximum acceleration a cars gearing and change points have to generate the maximum power "under the curve"
for each run to the redline. By doing this your cars engine is doing the maximum amount of work in the least possible time.
As a general rule of thumb, understanding torque and its rate of change can give insights into how a car will behave and feel - although some of this is very nuanced
power is directly proportional to torque multiplied by rpm
The action of a piston turning a crankshaft generates torque (governed by compression ratio and the lever length of the crank - hence lb and feet) the number of times it does this in a defined time defines the amount of power produced.
You will notice that the first to second gear change point in all Porsche sports cars, after a redline shift in first, will be at the far left point of maximum torque developed after variocam plus has become active e.g. always above 4000 rpm but with some subtlety between different models with different gearing, outputs and redline e.g. for a GT3 the run in second will start from around 5500 rpm..........for a GT4 or base Cayman this will start from around 4500 rpm
To achieve maximum acceleration a cars gearing and change points have to generate the maximum power "under the curve"
for each run to the redline. By doing this your cars engine is doing the maximum amount of work in the least possible time. As a general rule of thumb, understanding torque and its rate of change can give insights into how a car will behave and feel - although some of this is very nuanced
Last edited by randr; 04-03-2017 at 09:06 PM.
04-04-2017, 02:55 AM
#187
Its actually very simple if you look at the mathematical formula:
Power (kw) = Torque (N.m) X rpm / 9549
or
Power (hp) = Torque (ft lbt) x rpm / 5252
04-04-2017, 06:42 AM
#188
Actually, he's not wrong as he's talking about wheel torque at different rpm and gearing, not just engine torque.
04-04-2017, 07:42 AM
#189
Three Wheelin'
Originally Posted by isv
Actually, he's not wrong as he's talking about wheel torque at different rpm and gearing, not just engine torque.
04-04-2017, 07:55 AM
#190
Rennlist Member
04-04-2017, 08:35 AM
#191
Wasn't his point that you wanted to maximise the wheel torque when you changed gears ie short shift only if the wheel torque at the rev limit in the lower gear was lower than whatever it would be if you shifted gears before? given rpm is part of the calculation, power is by default being factored in as well.
04-04-2017, 11:09 AM
#192
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Look at it this way. The 991.1 GT3 cars are not going to somehow disappear. Ultimately, like every GT3, they will eventually be out of warranty. Companies will come out with fixes to address any shortcomings, just like they have in the past. Look at what Dundon is doing. Eventually we'll have power kits and revised top ends to choose from. That doesn't even consider the likely goodwill fixes that Porsche will provide.
I don't see the logic in taking a big hit selling mine and then buying another GT3 for something that may or may not even be an issue. Besides, we have no idea what demons the new GT3 will have. I have plenty of warranty left. No need to act at this stage. Car's amazing.
I also don't blame anyone for selling. Each of us have to make our own personal decision.
I don't see the logic in taking a big hit selling mine and then buying another GT3 for something that may or may not even be an issue. Besides, we have no idea what demons the new GT3 will have. I have plenty of warranty left. No need to act at this stage. Car's amazing.
I also don't blame anyone for selling. Each of us have to make our own personal decision.
Maybe I've been lucky, but my .1 GT3 is doing fine at 24K miles, about a third of them track miles (driven pretty hard). I had it on track this past weekend, after being away from the track for several months, and the car was amazing. Blows my mind what it can do on street tires with the grippy rubber only in the outer third of the tread.
I still have two years and about 25K miles of warranty, and I'm not seeing a compelling reason to 'upgrade' to the .2 GT3 for the sake of performance, reliability, or economics (I also think the .1 looks better). The .2 RS could be compelling though.
04-04-2017, 03:31 PM
#193
Nordschleife Master
Does anyone think .2GT3RS won't repeat the pricing history of the .1GT3RS? 
Seriously?
Expect prices to have dealer "market adjustments" putting prices near $300K for some time. 991.1GT3RS prices will be about $30,000.00 less.
Seriously? Expect prices to have dealer "market adjustments" putting prices near $300K for some time. 991.1GT3RS prices will be about $30,000.00 less.
04-04-2017, 04:48 PM
#195
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New rules , at least in EU, dictate
a current not too old Porsche GT or alternatively 2 ordinary Porsche ownership or no .2GT3 allocation
and once got
at least 1 year ownership of new .2 GT3 or forget next GT
no way to sell over MSRP allocations here and country porsche hq (not dealers)
verifying if buyer meets requirements
a current not too old Porsche GT or alternatively 2 ordinary Porsche ownership or no .2GT3 allocation
and once got
at least 1 year ownership of new .2 GT3 or forget next GT
no way to sell over MSRP allocations here and country porsche hq (not dealers)
verifying if buyer meets requirements