Quote:
GT2ETR said:
Quote:
MKSGR said:
One interesting fact regarding the shorter gearing: I exchanged information with a guy who has a car specced like a Rt12 (same engine, drive train, AWD etc.). This chap has the shorter gearing installed in his car. And indeed, his car is faster than a Rt12 with longer gearing. 2s translates into 4-5 car lengths. This is basically confirmed by him...

In essence, the 2s advantage seems to be reliable


MKSGR

4-5 car lengths is certainly the right answer! if this is what RUF told you, they are right! however, 2 seconds at 300kph are around 45 car lengths, not 5, (it is around 150 meters).

If a change in 6th gear could provide such an advantage, there would be no need for more than stock HP on any 997TT, gearing would take care of it..

During a 0-300kph run, the RT12 will start accelerating in 6th. gear at ca 265kph (around 5900RPMs) from 5th., all the way to 300kph. It takes 6 1/2 seconds to go from 265kph to 300kph in 6th gear. If a shorter 6th. shaves 2 seconds off this 6 1/2 seconds time, it equates to an additional 200HP or more.

If all gears have been spaced differently in the gearbox, then the 2 seconds could be more likely, but still very difficult to explain.

Back to the original discussion, the 993 car that was discussed earlier must have 650BHP + RUF equivalent power to reach those numbers.

Anyway, everyone and I apologize for the diversion.



There we have the explanation for our disagreement: A 2s reduction of the 0-300kph time does indeed translate into 4-5 car lengths, not more.

A rough estimate: 10s equal 150m. I have done some sample calculations based on the acceleration of 997TT (0-300 in ca. 41s), 599GTB (0-300 in ca. 31s) and Rt12 (0-300 in ca. 23s, assuming the shorter gearing).

When the 997TT reaches (real) 300kph @ ca. 2430m, the Rt12 has covered a distance of ca. 2790m. At this point in time, the 599GTB has covered a distance of ca. 2570m.