Sep 26, 2007 1:40:01 PM
Sep 26, 2007 1:47:20 PM
Quote:
Porsche will also tweak the VTG (Variable Turbine Geometry) system. And finally there's a strong possibility that the Turbo will inherit the GT2's 'expansion intake manifold'. Longer intake pipes mean cooler air enters the engine. The air is less dense but by upping the boost pressure the volume of air entering the engine remains the same. However, lower temperatures bring more efficient combustion. So it's cleaner and more powerful - the holy grail of sports car makers at present.
Sep 26, 2007 2:07:55 PM
Sep 26, 2007 2:33:15 PM
Sep 26, 2007 2:48:20 PM
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Alex (UK) said:Direct Injection
I think the difference with DI will be too small to notice myself. Yes, 4% extra power would be nice, but will you actually feel that?
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eclou said:
The car magazine article makes little sense regarding the intake:Quote:
Porsche will also tweak the VTG (Variable Turbine Geometry) system. And finally there's a strong possibility that the Turbo will inherit the GT2's 'expansion intake manifold'. Longer intake pipes mean cooler air enters the engine. The air is less dense but by upping the boost pressure the volume of air entering the engine remains the same. However, lower temperatures bring more efficient combustion. So it's cleaner and more powerful - the holy grail of sports car makers at present.
- colder air is MORE dense, not LESS dense
- lower temps do not bring more efficient combustion, it just prevents pre-ignition and maintains charge density
Quote:
edz61 said:Quote:
eclou said:
The car magazine article makes little sense regarding the intake:Quote:
Porsche will also tweak the VTG (Variable Turbine Geometry) system. And finally there's a strong possibility that the Turbo will inherit the GT2's 'expansion intake manifold'. Longer intake pipes mean cooler air enters the engine. The air is less dense but by upping the boost pressure the volume of air entering the engine remains the same. However, lower temperatures bring more efficient combustion. So it's cleaner and more powerful - the holy grail of sports car makers at present.
- colder air is MORE dense, not LESS dense
- lower temps do not bring more efficient combustion, it just prevents pre-ignition and maintains charge density
Noop cooler air means less dense
Quote:
cannga said:
I see a couple of problems with waiting:
1. By 2009/2010 or so, there will be talk of 998. It would be tough for me to spend 140k on a car when there is thought of a major redesign.
2. For US customers, worsening performance of dollar vs. Euro might be a problem. Porsche takes steps to protect itself against currency fluctuation, but this protection is not unlimited. I think the possibility is there of a higher than usual 1-2% annual price increase.
The ideal time for buying a car IMHO is first few months of second year (recent talk of Porsche's unannounced slight modification to 2008 997 Turbo's supports this move). Meaning YMMV, but: THE SWEET SPOT IS *EXACTLY* NOW!!
Sep 26, 2007 5:02:00 PM
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cannga said:
recent talk of Porsche's unannounced slight modification to 2008 997 Turbo's supports this move
Sep 26, 2007 5:49:14 PM
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Alex (UK) said:Quote:
cannga said:
recent talk of Porsche's unannounced slight modification to 2008 997 Turbo's supports this move
Did I miss that thread? I know the exhaust sound has been unofficially improved for MY08, what other rumours have there been? PTM improvements perhaps?
I have also been told that the PCM will be getting a fix soon for poor telephone module conversations.
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Crash said:Quote:
edz61 said:Quote:
eclou said:
The car magazine article makes little sense regarding the intake:Quote:
Porsche will also tweak the VTG (Variable Turbine Geometry) system. And finally there's a strong possibility that the Turbo will inherit the GT2's 'expansion intake manifold'. Longer intake pipes mean cooler air enters the engine. The air is less dense but by upping the boost pressure the volume of air entering the engine remains the same. However, lower temperatures bring more efficient combustion. So it's cleaner and more powerful - the holy grail of sports car makers at present.
- colder air is MORE dense, not LESS dense
- lower temps do not bring more efficient combustion, it just prevents pre-ignition and maintains charge density
Noop cooler air means less dense
You're incorrect. Why does hotter air lift and colder air sinks to the ground?
Sep 26, 2007 11:26:53 PM
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MMD said:
Ugh! Here we go again.
480 vs. 500+ hp? There's zero possibility of telling the difference on public roads without doing something stupid and dangerous.
Sep 27, 2007 1:15:19 AM
Sep 27, 2007 4:10:30 AM
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Ron (Houston) said:Quote:
MMD said:
Ugh! Here we go again.
480 vs. 500+ hp? There's zero possibility of telling the difference on public roads without doing something stupid and dangerous.
Exactly, also the ones that want to wait for supposedly the extra 20hp and DI will have to pay probably 10k to 15k more too.
Sep 27, 2007 8:07:19 AM
Sep 27, 2007 8:11:37 AM
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SoCal Alan said:Quote:
Ron (Houston) said:Quote:
MMD said:
Ugh! Here we go again.
480 vs. 500+ hp? There's zero possibility of telling the difference on public roads without doing something stupid and dangerous.
Exactly, also the ones that want to wait for supposedly the extra 20hp and DI will have to pay probably 10k to 15k more too.
Ron, the article states a 10% increase in power. Not a 20hp increase. Similarly a 10% increase in fuel economy.
But you're right. Probably, it will cost us, since nothing comes free from Porsche.
However, I doubt if we get a 10% hp increase as that will kill GT2 sales.
Sep 27, 2007 8:21:17 AM
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Ron (Houston) said:Quote:
MMD said:
Ugh! Here we go again.
480 vs. 500+ hp? There's zero possibility of telling the difference on public roads without doing something stupid and dangerous.
Exactly, also the ones that want to wait for supposedly the extra 20hp and DI will have to pay probably 10k to 15k more too.
Sep 27, 2007 8:46:20 AM
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Alex (UK) said:Quote:
Ron (Houston) said:Quote:
MMD said:
Ugh! Here we go again.
480 vs. 500+ hp? There's zero possibility of telling the difference on public roads without doing something stupid and dangerous.
Exactly, also the ones that want to wait for supposedly the extra 20hp and DI will have to pay probably 10k to 15k more too.
If we assume that the facelift car will be a MY10, and also assume Porsche puts the Turbo price up 2.3% each year like they did for MY08...
Then yes, the base price will indeed be a lot more expensive (about Pounds4.5k here in the UK).
Sep 27, 2007 2:20:30 PM
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Alex (UK) said:Quote:
Eric (Plug Guy) said:
PSE is due in April '08 or thereabouts for the turbo.
I started that rumour, and I also finished it too.
No PSE.
Sep 27, 2007 2:33:16 PM