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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 12-18-2018, 05:42 AM
  #31  
K-A
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And this, like most other articles, state that the chassis is essentially a reworked carry over of the 991 chassis, which makes logical sense when you look at, and realize the incremental rigidity increase of the new car.

https://www.roadandtrack.com/car-sho...specs-details/

Something seems "odd" about the claim that it's a "new platform." Perhaps Porsche's "new modular platform" designation really means taking a clearly over engineered 991 platform and tweaking it to be universally applicable to other models?

Also, an article linked above states that the new 8 speed has a "shorter first gear" while every other article states that the only difference is an additional overdrive gear, while all other gear ratios stay the same. Seems lots of bits of misinformation out there in regards to the technicalities of the new car. Maybe too many "resources" have gone into talking about the ever so interesting "wet mode."
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Old 12-18-2018, 10:05 AM
  #32  
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Originally Posted by K-A View Post
And this, like most other articles, state that the chassis is essentially a reworked carry over of the 991 chassis, which makes logical sense when you look at, and realize the incremental rigidity increase of the new car.

https://www.roadandtrack.com/car-sho...specs-details/

Something seems "odd" about the claim that it's a "new platform." Perhaps Porsche's "new modular platform" designation really means taking a clearly over engineered 991 platform and tweaking it to be universally applicable to other models?

Also, an article linked above states that the new 8 speed has a "shorter first gear" while every other article states that the only difference is an additional overdrive gear, while all other gear ratios stay the same. Seems lots of bits of misinformation out there in regards to the technicalities of the new car. Maybe too many "resources" have gone into talking about the ever so interesting "wet mode."
This is what I thought.... and reading about the rigidity stated from 997 ----> 991 stating the 997 has a stiffer chassis. That is certainly false. The new reworked chassis will absolutely be stiffer but not to the degree of increase stated by the numbers in this thread. So much misinformation, like my reply to your comment on the transmission gearing, for example
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Old 12-18-2018, 10:17 AM
  #33  
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Originally Posted by garfunkle View Post
This is what I thought.... and reading about the rigidity stated from 997 ----> 991 stating the 997 has a stiffer chassis. That is certainly false. The new reworked chassis will absolutely be stiffer but not to the degree of increase stated by the numbers in this thread. So much misinformation, like my reply to your comment on the transmission gearing, for example
Yep. The actual fact is that the 991 was 20% stiffer than the 997, and the 992 is 5% stiffer than the 991. Seems to me it's clear that one was an all new chassis (with all new wheelbase dimensions and vastly different proportions), and the other is a modified version of an existing chassis.

Re: Transmission. Very confusing which is true, indeed. Especially after reading your other comment.
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Old 12-26-2018, 03:14 PM
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The chassis doesn't float in thin air.

All the stuff bolted to it can be bolted on so that it carries some forces and thereby makes the car stuffer. Just think of Aston Martin and bars over the top of the engine. Same chassis whether you remove them or not, but stiffer.

Also keep in mind that a rear engine car flexes more than a mid-engine on the same bumps at the same rigidity. Lever forces.

Same for wheelbase. Short wheelbase means less bending on same bump at same rigidity.

A 911 has a need for a stiffer chassis.
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Old 01-05-2019, 02:20 AM
  #35  
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Originally Posted by K-A View Post
Yep. The actual fact is that the 991 was 20% stiffer than the 997, and the 992 is 5% stiffer than the 991. Seems to me it's clear that one was an all new chassis (with all new wheelbase dimensions and vastly different proportions), and the other is a modified version of an existing chassis.

Re: Transmission. Very confusing which is true, indeed. Especially after reading your other comment.
The gear ratios for the 992 have been released and the PDK in the new car has shorter ratios in first through seventh in the 991.2 PDK. Eighth provides a much taller top gear.
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