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- 2011 F150
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- Badlands
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I just finished watching the video below. The video explains how an electronic throttle-body leads to rev hang with a manual transmission. In short, to prevent additional emissions of either CO and HydroCarbons (Rich fuel/air mixture) or NOx (Lean fuel/air mixture), the closing of the throttle-body is delayed to allow excess fuel coating the header to be burnt efficiently and opening of the throttle-body is delayed to allow fuel to be mixed properly.
Since the 2.3L is direct injection, there is no fuel coating the intake reducing the time needed to clear the excess fuel when the throttle-body closes shorting the rev hang.
In short, are emissions are a part of the reason preventing the manual transmission being used with the 2.7L Port and direct injection?
Now I drove a Scion FR-S with a 6 speed MT and the Toyota DS-4 Fuel system with direct and port injection and I don't recall any issues with rev-hang on that car.
Since the 2.3L is direct injection, there is no fuel coating the intake reducing the time needed to clear the excess fuel when the throttle-body closes shorting the rev hang.
In short, are emissions are a part of the reason preventing the manual transmission being used with the 2.7L Port and direct injection?
Now I drove a Scion FR-S with a 6 speed MT and the Toyota DS-4 Fuel system with direct and port injection and I don't recall any issues with rev-hang on that car.
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