I used the wideband's 0-5v output together with a custom circuit to alter the narrowband switchpoint anywhere from 12:1 to 17:1.
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I also wonder if an engine with a wideband sensor would have more of tendency to behave this way (i.e., be more linear than one would expect).
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That wouldn't make a difference. Ignoring fuel completely, your engine's torque curve is a product of how much AIR it can suck in at WOT at a given RPM. The reason torque falls off at high RPM is because at those speeds, your intake valves aren't open long enough to fully charge the cylinder. The reason you may have more torque at 3k than at 2k is because of the resonant effects of the intake and exhaust systems.