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It's amazing that people are still talking about power band like it's the same thing as responsiveness.
Sure a small or VGT turbo might make full boost by 2000 rpm or whatever, on a dyno pull starting at 1500. That's where the power band starts, cool.
However, transient response is "what do I get right when I step on the throttle?" How long does it take to get the engine's full output (at a given rpm)? On an NA it's almost instantaneous, same with a SC. With a turbo, no matter how low of an RPM it can make boost, it's still needs to spool after you crack the throttle and adds to the transient response.
For example a Rotrex setup will make less low-to-mid range torque than a properly sized turbo setup, but the Rotrex will still have a sharper response to throttle inputs in the real world.
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