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Originally Posted by Tobz
Hey blue2000s
I think ur getting engine torque mixed up with gearing. Yes a lower gear will produce more torque, but the engine will be losing it pulling power as the rev rise. So yes u are correct a lower gear at 40kmh will produce more torque than 40kmh at a higher gear, but ur poor engines torque output is in decline after it reaches its peak output.
What u will find is even though the higher rev range may be available, if the engines peak torque is at 5000rpm and peak power at 6000 rpm u won't want to rev past 6500 as the engines pulling ability just won't be there, it would be more beneficial to change to the next gear. Remember a gear box only multiplies the engines torque output, and Porsche spent hours working out the ratios to ensure maximum performance through the gears.
If in this case the turbo has changed where peak power and torque is, then yes the limit might need to be raised, but this could have reliability issues for the engine as it was made to rev to a certain limit.
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Torque follows a curve, but it's multiplied by the gear ratio. As long as the gear ratio is low enough, the torque at the lower gear will exceed the torque at the next gear up. As long as it's making more torque in the lower gear, that's where you get the best acceleration. Just about every sports car will be geared to take advantage of the entire rev range. See attached for the 986S.