Atrox

I'll take the 911 01 and 02 turbo structural differences for $1000 Alex...

Answer: what is, going around in circles.

jumper5836

The article is based of other references and the 996 Porsche essential companion says the same thing. "The 996.1 is 45% torsional and 50% bending stiffness over the 993."

The 2001 Turbo is 49% and 82%, this is a 4% and 32% difference over the 996.1 and the 996.2 is stated as 25% over the predecessor meaning the 996.1.

Maybe cutting a whole in the dash to fit a glove box reduced the torsional and bending stiffness of the later 2002 shell to be only a 25% increase over the predecessor.

jumper5836

some other info I found based on 911 model differences

'88 911 7k nm/deg (measurement by burgermeister)
964 11.5k nm/deg (993 was 20% stiffer)
993 13.9k nm/deg (996 was 45% stiffer)
996 20.1k nm/deg (Excellence was Expected p.1381)
996.2 25.1k nm/deg (996.2 was 25% stiffer)
997 33k nm/deg
991 40k nm/deg (porsche used 20% torsionally stiffer as a design target, has claimed "up to 25% stiffer")

also
Porsche 911 Turbo 996: 27k Nm/deg
Porsche 959 12.9k Nm/deg
Porsche Carrera GT - 26k Nm/deg
987 Boxster 16.5k NM/deg
981 Boxster 23k NM/deg (40% more)
987 Cayman 30k NM/deg
981 Cayman 40k NM/deg

"02996ttx50

it only goes in circles relative to the preponderance of evidence presented here and elsewhere, that the chassis of the mk2 was "stiffened" by 25%, as compared to the mk1, vis a vis those who are still willing to try and dispute such "evidence', as measured against the continued willingness of those of us who still enjoy playing along.

beyond that, it's game over, and the circle will not be broken.

rmc1148

Eventually someone will show pictures of actual or supposed reinforcement locals and we will know. I think no difference actually. We will see.

jumper5836

Basically I am still under the same conclusion as said in post #3 and believe the only additional change

was in post #10 and #23 where it explains it best, with the side tube added in 2002.

I believe from all the other evidence that the 2001 was based of the 996.1 C4 shell and strengthened. This is proven by the evidence that the 996.1 strength and the 2001 Turbo were not equal.
That the 996.1 was 45% stronger over the 993 which had a 993 13.9k nm/deg strength, the 996.2 was 25% strengthened over the 996.1. There has been nothing else that has been brought to this thread that proves the 2001 Turbo shared the same shell as the 996.1 with no improvements. I think if fact there is more evidence that this is not the case.

Also is the myth that the 996 C2 and C4 are different strengths, these were both equally strengthened. The C4 shell used in the GT3 and Cup cars, for the main reason that was the fact that this was the only body which could be used to meet the fuel tank requirements for a range of race series (FIA GT Championship, etc).
Under these regulations, no part of the fuel tank may extend beyond the forward-most point of the front wheel.

The resulting tank in the street (homologated car) offered a refill volume of 89 litres. This additional capacity was achieved solely by extending the tank into the front differential cavity, without any modification to the shell.

In the end the rigidity strength of the Turbo equals or exceeds the strength of even the super car 959 and Carrera GT but in any way 2001 or 2002+ is less then a late model Cayman and 997

mcbit

Since you are happy to quote Adrian Streather, try this one from Page 49 of the Essential Companion: Brief description of incorporated change by model year.


2002
However I would put my faith in the 2 Porsche Technical documents already referenced.

jumper5836

Yes I agree over the 996.1 shell but the 2001 Turbo tub all ready had this done.

the 2001 Shell was increased by 4% and 32% over a 996.1, which if you try and translate that into total rigidity strength probably equates to 25% that the 2002 says. You think that in 2001 they after increasing everything stated in the 2001 release doc, that then scrap it for 2002 models. No they would use this as the new 2002 shell.

Mark Dreyer

The car as is from the factory is so unsuitable for track use, I doubt any difference in chassis stiffness would be observable as your attention would be directed to fighting body roll and under steer on the track. Now with a proper suspension upgrade (I installed a PSS10 suspension on my 01 TT), perhaps chassis stiffness could be evaluated. :-) BTW I've never tracked my TT, and don't intend to as I have a dedicated Boxster track toy. I do take the cloverleaf highway entrance turns at pretty good clip however and what a difference in TT handling with the Bilstein suspension!

rmc1148

Yes upgraded suspension will allow car to be pushed harder for sure and one could play that game all day= more power pushed harder need more this that etc. I usually upgrade my suspension but with this car have left stock as I would like to see at least a few 996tts remain stock lol. There are many good examples of 996tts doing well on the track but would not be my first choice for such use.