My theory on what RPM to run is based on how far the throttle is open. Around town, when I am in traffic and I have the throttle barely open, I will run it in the 2500-3000 range. If I want to go near full throttle, I am never below around 4500. So usually, when I'm on the freeway and I'm going to do some slicing and dicing, I keep it around 4000 and when I accelerate, shift around 5500, maybe 6000. No need to goto redline since the max HP on our cars drops off around 6500 and max torque is around 4500.
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Current car
2000 Boxster 2.7l red/black
Previous cars
1973 Opel Manta
1969(?) Fiat 850 Convertible
1979 Lancia Beta Coupe
1981 Alfa Romeo GTV 6
1985 Alfa Romeo Graduate
1985 Porsche 944
1989 Porsche 944
1981 Triumph TR7
1989 (?) Alfa Romeo Milano
1993 Saab 9000
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