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For my El Camino, the torque band starts at 1,400 RPM and peters out at 4,000 RPM from restrictive heads. The highway cruise at 75 (legal limit) is 2,700 RPM.
For my 85 911 with the 3.2 engine, 2,200 RPM is my minimum on level ground. I changed out the 5th gear to the tallest 5th made for a 915 transmission, and I will have to look up the numbers. At 80 I am turning 3,500 RPM and my rear tires are 255/40 17s. The bad news with the tall 5th is below 55 to 60 MPH, 4th is required as 5th gear is below 2,200 RPM. I do regular long road trips. I have driven my 911 to 41 states and Canada and plan to visit all the lower 48 states in my 911. From northern Maine, Key West, and California three times. I love the taller 5th gear.
In our Cessna 182T, redline, emergency power we might die with less is 2,500 RPM. Normal cruise is 2350 but it is a 540 cubic inch, flat 6 with 240 HP.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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