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Message: <blockquote data-quote="shiroitenshi" data-source="post: 3208882" data-attributes="member: 27518">Yes, siputmagic, in the carburetor days, it does affect flow velocity, due to the venturi effect in the carb intake opening, but with new intake manifold designs, it seems that the venturi effect is determined by the runners leading down to the combustion chamber.I'm not sure if any book/technical paper discusses this topic specifically, but if I remember right, venturi effects work best in a straight path, which isn't the case with these intake design.So, in my thinking, the runners play a bigger part than the TB in this case, and using bigger TB usually means you'll hit peak flow at lesser throttle angle, like if the stock one gets peak flow at around 80% throttle with the 70mm, then with a 90mm, it'll be earlier, possibly at 60% throttle. Since ultimately limited by runner size, running bigger TB simply means it will only consume as much air as the engine can suck, unlike boosting, where air is forced in, hence any bottlenecks is a restriction.</blockquote>

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