996 Turbo / GT2 Turbo discussion on previous model 2000-2005 Porsche 911 Twin Turbo and 911 GT2.

Theoretical Top Speed

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Old Mar 25, 2008 | 04:00 PM
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Like they always say... IT IS HOW YOU GET THERE. How often do you do to the max anyway?
 
Old Mar 25, 2008 | 05:25 PM
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is my tach off ?
i hit 202mph as indicated on the digital speedometer @ 6400 rpm
 
Old Mar 25, 2008 | 05:30 PM
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Tach is off. I hit 197 laser verified a couple weeks ago at Brunters and I was definitely over 6500. That equates to 203 on the speedo.

What size tires are you running?
 
Old Mar 25, 2008 | 07:22 PM
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Originally Posted by Terminator
Just curious, why would you say it's dangerous? I only stayed up there for 15 seconds (didn’t see much point holding it there for longer anyway) but temperature was fine (80 degrees) and oil pressure was right up. All seemed fine to me.
It's only my speculation. I guess when you reach the limitation of the car, you are also very close to the critial point of some mechanical fail.


Originally Posted by Kaizu
It isn't that dangerous for the mechanics. More dangerous for your driver's license unless there's free speeds
You are right!
 
Old Mar 25, 2008 | 09:21 PM
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In the 3.6 Carrera, I showed 184 mph on the speedo at 7000rpm (I think there was 200 rpm left before redline) which was actually 178 mph on the GPS.

I was pretty surprised because Porsche lists the top speed at 177 mph! This was also done with 2 people in the car and a full trunk of luggage!

Given this observation, I thought the Turbo might actually have a top speed a few mph than the 189 that Porsche states.

Originally Posted by Kaizu
It isn't that dangerous for the mechanics. More dangerous for your driver's license unless there's free speeds



Yep those 3.6l Carreras are fast! I've driven myself a same car to the same speed!
(It was too 178 mph on GPS, atually it was 296 km/h in the GPS and 305 km/h in the speedo)
...we have tested the limits...almost

That car's rated considerably lower at 285 km/h by the factory. Porsche is a bit conservative in its claims, always has been. That is a known fact.

Turbo isn't massively faster due to drag. That's why many fast Autobahn Porsches are narrowbodies (Ruf and 9FF for example have very fast narrowbody models.)
 
Old Mar 25, 2008 | 11:18 PM
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At 190mph you have about 300bhp equivalent aerodynamic resistence in the 996TT. So if your car has more than 300bhp, you can keep going.

High downforce cars such as the CGT also have downforce penalty at high speeds, equivalent to an incremental 600lbs of additional weight at top speed, over and above the aerodynamic drag, but on the 996TT downforce is very limited so not a factor.
 
Old Mar 26, 2008 | 03:07 PM
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Agree with the CGT comment Jean - spot on! Talking to a few owners at VMax, they said that at 175mph it hits a brick wall.
 
Old Mar 26, 2008 | 03:42 PM
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Originally Posted by jimmer23
Agree with the CGT comment Jean - spot on! Talking to a few owners at VMax, they said that at 175mph it hits a brick wall.
As early as that? Jesus...
 
Old Mar 26, 2008 | 06:53 PM
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