Also have to remember that as you increase the engine RPM you are spinning the SC unit higher/faster.
I know with GTMs kit that at around 7500 RPM (factory set) you are at the max limit of spinning most rotrex units, especially once you drop below the 90mm pulley size. So pushing the engine RPM up will put you out of spec for the SC and overspinning gives you no benefit other than killing the SC faster.
This is strictly speaking for the rotrex units, stillen's kit (vortech) might different but I imagine it has limitations as well but it might have a higher threshold.
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