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992 chassis: Is it all new? Engine moved toward the middle? Torsional rigidity?

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992 chassis: Is it all new? Engine moved toward the middle? Torsional rigidity?

Old 12-15-2018, 01:51 PM
  #16  
JMartinni
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Originally Posted by groundhog View Post
The engine mounts are 20cm further forward according to the marketing document supplied to dealers.
Note that's engine mounts, not the engine.
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Old 12-15-2018, 01:55 PM
  #17  
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Torsional rigidity?



Document can be found here: https://presskit.porsche.de/workshop...downloads.html
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Old 12-15-2018, 02:08 PM
  #18  
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Originally Posted by JMartinni View Post
How does this compare with previous models?
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Old 12-15-2018, 03:50 PM
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Has someone seen this?





It means that non-S models will have narrow body?!
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Old 12-15-2018, 04:21 PM
  #20  
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Originally Posted by garfunkle View Post
How does this compare with previous models?
Some static torsional rigidity numbers that float around online. How accurate these are I don't know.
918 Spyder (roadster) -- ~40000 Nm/deg
991 Carrera (coupé) -- ~30359 Nm/deg
991 Carrera (cabriolet) -- ~11699 Nm/deg
987 Cayman (coupé) -- ~31500 Nm/deg
997 Carrera (coupé) -- ~33000 Nm/deg
980 Carrera GT (roadster) -- ~26000 Nm/deg
996 Turbo (coupé) -- ~13500-27000 Nm/deg
996 Turbo (cabriolet) -- ~11600 Nm/deg
996 Carrera (coupé) -- ~20120 Nm/deg
993 Carrera (coupé) -- ~13876 Nm/deg
964 Carrera (coupé) -- ~11563 Nm/deg
959 (coupé) -- ~12900 Nm/deg
G series 911 Carrera (coupé) -- ~7050 Nm/deg
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Old 12-15-2018, 06:44 PM
  #21  
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Originally Posted by JMartinni View Post
Some static torsional rigidity numbers that float around online. How accurate these are I don't know.
918 Spyder (roadster) -- ~40000 Nm/deg
991 Carrera (coupé) -- ~30359 Nm/deg
991 Carrera (cabriolet) -- ~11699 Nm/deg
987 Cayman (coupé) -- ~31500 Nm/deg
997 Carrera (coupé) -- ~33000 Nm/deg
980 Carrera GT (roadster) -- ~26000 Nm/deg
996 Turbo (coupé) -- ~13500-27000 Nm/deg
996 Turbo (cabriolet) -- ~11600 Nm/deg
996 Carrera (coupé) -- ~20120 Nm/deg
993 Carrera (coupé) -- ~13876 Nm/deg
964 Carrera (coupé) -- ~11563 Nm/deg
959 (coupé) -- ~12900 Nm/deg
G series 911 Carrera (coupé) -- ~7050 Nm/deg
Those can't be right... the 992 chases is the same so it can't have THAT much difference. *Also - no way the 997 was stiffer than the 991. * You did say that you just found these numbers and not stating as gospel so I'm not directing this at you personally
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Old 12-15-2018, 08:25 PM
  #22  
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This website also has a list:

http://youwheel.com/home/2016/06/20/...ehensive-list/

Porsche

Porsche 911 Cabriolet 991 (2012) 11,699
Porsche 911 Carrera GT 26,000
Porsche 911 Carrera Type 997 33,000
Porsche 911 Coupe 991 (2012) 30,359
Porsche 911 Turbo (2000) 13,500
Porsche 911 Turbo 996 27,000
Porsche 911 Turbo 996 Convertible 11,600
Porsche 959 12,900
Porsche 987 Cayman 31,500
Porsche Carrera GT 26,000

If that list is to believed that's some pretty solid gains for 992.
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Old 12-15-2018, 08:27 PM
  #23  
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Originally Posted by garfunkle View Post
Those can't be right... the 992 chases is the same so it can't have THAT much difference. *Also - no way the 997 was stiffer than the 991. * You did say that you just found these numbers and not stating as gospel so I'm not directing this at you personally
Read the Technology Workshop guide. The chassis has been seriously modified/upgraded.
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Old 12-16-2018, 01:07 AM
  #24  
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Originally Posted by erik_plus8 View Post
So there will be a GT3 Cab.
Not necessarily. That chart really doesn't mean anything. Not only is it developed by the marketing department for public viewing, but even if it did mean such, cars can be cancelled late into development.

Originally Posted by garfunkle View Post
Btw, since it’s the same chassis... that’s a testimony to just how good the 991.1 chassis is! With the likes of carbon fiber and monocoque coming down market, no way Porsche would release a new 911 that wasn’t competitive.
It is not the same. Very different.

Originally Posted by garfunkle View Post
How does this compare with previous models?
Most are according to jumper5836:

911 A-F: 3,500 NM/deg (????? I seem to recall reading something like this somewhere)
911 G: 7,000 NM/deg (according to burgermeister on Pelican)
959: 12,900 NM/deg
964: 11,500 NM/deg
993: 13,900 NM/deg
996: 20,100 NM/deg
996.2: 25,100 NM/deg
996 TT: 27,000 NM/deg
997: 33,000 NM/deg
991: 40,000 NM/deg

Those are coupes. And to be taken at face value; none are proven or documented.

Fun comparison.....
Lamborghini Countach: 2,300 NM/deg !


Originally Posted by Cautery View Post
It means that non-S models will have narrow body?!
It has been stated that base and S 992s receive the same width fenders.
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Old 12-16-2018, 01:31 PM
  #25  
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Originally Posted by garfunkle View Post
Those can't be right... the 992 chases is the same so it can't have THAT much difference. *Also - no way the 997 was stiffer than the 991. * You did say that you just found these numbers and not stating as gospel so I'm not directing this at you personally
The 992 chassis is not the same as 991.1/991.2.
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Old 12-16-2018, 03:25 PM
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Originally Posted by Cautery
Has someone seen this?





It means that non-S models will have narrow body?!

Just saying the S is wider body since it's the one released. The base models will have he same wide body.
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Old 12-16-2018, 05:11 PM
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Originally Posted by STG View Post
Just saying the S is wider body since it's the one released. The base models will have he same wide body.
the new car is wider than the old one
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Old 12-17-2018, 05:09 PM
  #28  
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Originally Posted by erik_plus8 View Post
So there will be a GT3 Cab.
or just a GTS...
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Old 12-17-2018, 07:38 PM
  #29  
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Originally Posted by erik_plus8 View Post
So there will be a GT3 Cab.
...very likely, or just a Speedster.
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Old 12-18-2018, 05:20 AM
  #30  
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Originally Posted by FrenchToast View Post
R&T claims the 992 is 5% stiffer than outgoing 991.2. (click for source)

R&T specifies the 991.2 rather than saying 991; are they are implying a 991.2 is stiffer than a comparable 991? I don't know.

Anyway, the 991 is supposedly 40,000 NM per degree.

5% increase would place the 992 at 42,000 NM/deg.

The same R&T article also says the engine mounts (says nothing about engine centerline) have moved forward a not-really-believable 6.6" (168mm), rather than the 20mm previously quoted.

While everything is relative, I would not say the 992 is just a "991.3." The chassis is entirely different and reengineered. Things changed include the wheelbase, suspension geometry, engine placement, track width, etc. Engineered from the ground up? No, but nothing ever is.

Anyway, the 992 chassis uses around 60% aluminum, 991 was around 30%. That statistic alone is evidence the chassis would have to be comprehensively reevaluated for stiffness, deflection, handling, crashworthiness, corrosion resistance, fatigue, etc.
Appears via Porsche, the 992 is 39,000 NM/deg, which means the 991 being officially claimed as 5% less stiff, should be around 37,150 NM/deg, which makes sense considering Porsche said it was around 20% stiffer than the 997. The 6.6" statement is clearly inaccurate. Also, the wheelbases are identical in dimensions. Something just seems odd to me that Porsche is stating it's an all new chassis (heavily reworked, makes sense) when the wheelbase is identical, the actual proportions are identical (minus the front getting a longer overhang, that's it), the engine placement appears identical, minus a microscopic movement, the windshield rake, roofline, etc. are identical. Perhaps it's simply in keeping with 911 tradition ("not messing with perfection"), but the likeness is so stark, it seems odd they'd position an all new chassis to be so identical to an apparently completely different previous one (i.e not one bit of difference in fundamental proportions, not a cm of difference in wheelbase, etc.).

Originally Posted by JMartinni View Post
Interesting. So the 991 is just over 37K nm/deg.

Originally Posted by JMartinni View Post
Some static torsional rigidity numbers that float around online. How accurate these are I don't know.
918 Spyder (roadster) -- ~40000 Nm/deg
991 Carrera (coupé) -- ~30359 Nm/deg
991 Carrera (cabriolet) -- ~11699 Nm/deg
987 Cayman (coupé) -- ~31500 Nm/deg
997 Carrera (coupé) -- ~33000 Nm/deg
980 Carrera GT (roadster) -- ~26000 Nm/deg
996 Turbo (coupé) -- ~13500-27000 Nm/deg
996 Turbo (cabriolet) -- ~11600 Nm/deg
996 Carrera (coupé) -- ~20120 Nm/deg
993 Carrera (coupé) -- ~13876 Nm/deg
964 Carrera (coupé) -- ~11563 Nm/deg
959 (coupé) -- ~12900 Nm/deg
G series 911 Carrera (coupé) -- ~7050 Nm/deg
Originally Posted by OHWHATDA View Post
This website also has a list:

http://youwheel.com/home/2016/06/20/...ehensive-list/Porsche

Porsche 911 Cabriolet 991 (2012) 11,699
Porsche 911 Carrera GT 26,000
Porsche 911 Carrera Type 997 33,000
Porsche 911 Coupe 991 (2012) 30,359
Porsche 911 Turbo (2000) 13,500
Porsche 911 Turbo 996 27,000
Porsche 911 Turbo 996 Convertible 11,600
Porsche 959 12,900
Porsche 987 Cayman 31,500
Porsche Carrera GT 26,000

If that list is to believed that's some pretty solid gains for 992.
These are all fake figures for the 991. It's unfortunate how easily misinformation gets spread on the internet (not blaming you guys, blaming those who publish said figures). Someone posted an inaccurate rigidity figure once, and every single "rigidity compilation" since has copy/pasted it.

The 991 was stated by Porsche to be 20% stiffer than the 997, and 5% less stiff than the 992. Easy to do the math. So stiff that after nearly 8 years, they "only" could squeeze 5% out of its replacement model. That puts it around 37-38K nm/deg.
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