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Originally Posted by Isaac Zachary
Install a less powerful engine. A less powerful engine will need you to keep the throttle open more, reducing intake restricion.
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Thi might explain why the last variant of the Ford Flathead V8 to be made in France had some quite narrow ducts, which were bad for power yet better for low-end torque. They were fitted to some military trucks, which ultimately had a Renault Diesel engine as a replacement for the Flathead...
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Adding EGR or lean burn. The less fuel there is to everything else in the intake charge means it produces less power. Less power means you have to make up for it by opening up the throttle even more.
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Occasionally the heat recovered along the EGR flow may lead to a more accurate vaporizing of the fuel too. But it seems to only be good for gassers. Most often on Diesels EGR is quite a PITA...
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Get a diesel. Diesel engines don't have a throttle. On them you next step would be things like the air filter.
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Choking too much a Diesel engine with an undersized air filter would be a matter of concern, at least for the mechanically-governed ones. But I would still take it with a grain of salt even with an electronically-governed one.