Consolidated 991RS thread
03-04-2015, 05:49 PM
#6196
Preuninger also explained his decision to only offer a manual gearbox on the Cayman GT4, saying ‘We put a manual in it for good reason – to show people that we listened.’ Clearly, then, Porsche Motorsport is responsive to its customers’ demands. If enough people call for a Cayman GT4 RS, it might just happen…"
Porsche shouldn't be surprised by the demand for the GT4. Many of us have been trying hard to articulate this alternate perspective. The fact that they were surprised suggests they still don't entirely understand quite a few of their customers, something I've felt over the last couple years. The fact that they are willing to listen and change, at least partly, is excellent. I still live in hope.
03-04-2015, 06:03 PM
#6197
They are not reduced when stroked.
Because excessive engine speed/piston speed cuts into reliability.
When the piston travel is lengthened (stroked) engine speed rises. In this example, 3.8 vs. 4.0, the latter has the same engine speed as the former (as the latter is stroked), hence the necessity to reduce red-line.
The RS's 4.0L 8,800 rev ceiling has the same engine speed as the GT3's 3.8L @ 9,000 rpms.
Because excessive engine speed/piston speed cuts into reliability.
When the piston travel is lengthened (stroked) engine speed rises. In this example, 3.8 vs. 4.0, the latter has the same engine speed as the former (as the latter is stroked), hence the necessity to reduce red-line.
The RS's 4.0L 8,800 rev ceiling has the same engine speed as the GT3's 3.8L @ 9,000 rpms.
03-04-2015, 06:05 PM
#6198
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That colour is crazy: once it looks red once orange! I am just arrived in geneva and will attend the show tomorrow morning! Keep u posted cheers
03-04-2015, 06:19 PM
#6200
Rennlist Member
03-04-2015, 06:22 PM
#6201
See this post for more info:
https://rennlist.com/forums/991-gt3/...l#post12060807
03-04-2015, 06:23 PM
#6202
Race Car
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Location: The way to hell is paved by good intentions “Wenn ich Purist höre...entsichere ich meinen Browning” "Myths are fuel for marketing (and nowadays for flippers too,,,)" time to time is not sufficient to be a saint, you must be also an Hero
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Yep. I'd pull them out when I got the car. I suspect the mesh is regulations driven and of little practical value (unlike mesh protecting radiators, etc).
Thanks...
Actually the GT3 RS 4.0 had a larger bore (102.7) and shorter stroke (80.4). So they did doubly well to extend the redline- in theory the RS 4.0 should be able to rev higher.
Thanks...
Actually the GT3 RS 4.0 had a larger bore (102.7) and shorter stroke (80.4). So they did doubly well to extend the redline- in theory the RS 4.0 should be able to rev higher.
03-04-2015, 06:25 PM
#6203
Three Wheelin'
03-04-2015, 06:27 PM
#6204
Rennlist Member
If we go by corrected piston speed (mean piston speed x (bore /stroke)^.5) we find the 991 RS's 8,800 rpm is the harder technical challenge vs essentially any motor currently made barring the 918. It's under significantly more stress than the 458 SP's 9,000 rpm (26.7 vs 26.2), etc. Could Porsche have pushed futher? Perhaps- motorcyles are higher still. But it seems likely Porsche felt it best not to push its luck after the GT3's engine problems.
See this post for more info:
https://rennlist.com/forums/991-gt3/...l#post12060807
See this post for more info:
https://rennlist.com/forums/991-gt3/...l#post12060807
03-04-2015, 06:31 PM
#6206
Burning Brakes
I met with a couple Porsche engineers last month. They were genuinely interested in hearing why I preferred a manual. I've lived with the Autobahn and driven the 'Ring, so I can understand much of the environment that influences cars Porsche makes. Hopefully I was also able to share my perspective that those are in part geographically specific- different factors influence our diving experience elsewhere. Porsche shouldn't be surprised by the demand for the GT4. Many of us have been trying hard to articulate this alternate perspective. The fact that they were surprised suggests they still don't entirely understand quite a few of their customers, something I've felt over the last couple years. The fact that they are willing to listen and change, at least partly, is excellent. I still live in hope.
03-04-2015, 07:03 PM
#6207
Rennlist Member
03-04-2015, 07:03 PM
#6208
Not sure what you mean, was there was a question? Wider hips mean the RS has a better high pressure area there than the GT3, so it makes sense to move the intakes and it should get a bigger effect...
They've got 430 through 500 hp engines sitting there, and it's still got strut rear suspension. If the gloves are coming off one can still ask for them to come off completely... Understanding it would need to cost more.
03-04-2015, 07:04 PM
#6209
If we go by corrected piston speed (mean piston speed x (bore /stroke)^.5) we find the 991 RS's 8,800 rpm is the harder technical challenge vs essentially any motor currently made barring the 918. It's under significantly more stress than the 458 SP's 9,000 rpm (26.7 vs 26.2), etc. Could Porsche have pushed futher? Perhaps- motorcyles are higher still. But it seems likely Porsche felt it best not to push its luck after the GT3's engine problems.
See this post for more info:
https://rennlist.com/forums/991-gt3/...l#post12060807
See this post for more info:
https://rennlist.com/forums/991-gt3/...l#post12060807
Now I inderstand the real value of the Mezger, and how you described it as modular and the DFI as tuned to its potential.
03-04-2015, 07:15 PM
#6210
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I spoke with porsche of melbourne today and they said I could have allocation #11 for the RS. If I were to get this allocation # would I have a chance of getting the car at all or would all the orders porsche allows be filled out by the time it gets to me?