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Yes. And I should've added tire diameter as another differentiating factor.
For example the Cup rear tire is a 31/71-18, which has an overall diameter of 27.8" whereas the new RS is spec'd with a 325/30-21, which has a diameter of 28.7". Almost an inch taller.
This photo from last weekend's Sebring IMSA race gives a good sense of just how much lower they run the GTD class 911's.
Yes. And I should've added tire diameter as another differentiating factor.
For example the RSR rear tire is a 31/71-18, which has an overall diameter of 27.8" whereas the new RS is spec'd with a 325/30-21, which has a diameter of 28.7". Almost an inch taller.
The net result of the larger rear tire diameter is more speed at any selected gear/RPM combination compared to the 991GT3 or earlier cars with smaller rear tire overall diameter. If you have the torque to support it the new 991.1 GT3RS will be a faster car, i.e. faster speed at any point in the gear range. Now since the reported redline is lower in the GT3RS perhaps Porsche is planning marginal gains in speed with lower RPM when compared to the GT3.
in my opinion such a higher rear (with the flat underbody panel) could be a hint of diffuser with aerodynamic purpose as we can can see in mid engine cars..
poor picture...white balance is off...White would match my Cayenne GTS perfectly...however, I am ballz out magma if my allocation/build comes through...
poor picture...white balance is off...White would match my Cayenne GTS perfectly...however, I am ballz out magma if my allocation/build comes through...
in my opinion such a higher rear (with the flat underbody panel) could be a hint of diffuser with aerodynamic purpose as we can can see in mid engine cars..
Diffusers are useless unless they operate very close to the road surface; rear of the RS is well above the functional threshold.
The net result of the larger rear tire diameter is more speed at any selected gear/RPM combination compared to the 991GT3 or earlier cars with smaller rear tire overall diameter. If you have the torque to support it the new 991.1 GT3RS will be a faster car, i.e. faster speed at any point in the gear range. Now since the reported redline is lower in the GT3RS perhaps Porsche is planning marginal gains in speed with lower RPM when compared to the GT3.
They changed the final drive ratio to cancel out the wheel diameter change, so net gearing is almost identical to the regular GT3.
03-23-2015, 05:17 PM
