TB993tt:
Had the opportunity to give a friends 991 turbo S a good thrashing round an airfield today. The first surprise was when we compared its acceleration to a non S 991 turbo there was zero difference at all both two up.
The next interesting thing was that at the top end, over 250kph the acceleration falls off quite badly, in fact the maximum speed it was managing was around 190mph/306kph (after ~1.5 miles) and this was about the same top speed as the 997 turbo S which was there. A 480PS 997.1 Mezger was managing similar top speed numbers numbers. It seems the Dfi motor will deliver its hp in the lower speed ranges but at high loads the engine reduces the power.
For comparison of real Mezger hp my 993 turbo (with draggy GT2 bodywork and wing) with 577PS and Secan intercooling was hitting its rev limiter at 201mph 150 metres before the timing beams.
The Turbo S was supremely stable and quiet, taking launch control launches in its stride, it is incredible how they have made it feel 200kg lighter in the way it handles, it changes direction probably better than my 7GT2 and the lateral acceleration it can pull is incredible it seems the back end is fully tamed
My experience has been different...twice. Up to 180 kph or so, the 997 Turbo S keeps up quite nicely (without using launch control on the 991 Turbo S) but over 220 kph, the 997 Turbo S clearly falls back. Weird. I always have full 1.2 bar boost pressure (according to digital display) over 220 kph, almost up to top speed (337 kph on the speedo, real 320 kph measured by GPS). I use 100 octane VPower fuel (95 octane US), car has 7200 km on it.
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RC (Germany) - Rennteam Editor Porsche 991 Turbo S, Porsche Boxster S (981), Jeep Grand Cherokee SRT (2014), BMW X3 35d (2013)