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Message: <blockquote data-quote="shiroitenshi" data-source="post: 2446008" data-attributes="member: 27518">Intake manifold affects plenum volume. I believe this is related to how well the part throttle torque will be like.TB size affects max flow possible at WOT, for NA engines, this is how much air your engine can suck at max, while for Turbo's, since air is pushed in, naturally the TB sizes are always a lot bigger.bigger TB's give better response, but it's more like due to their 10% opening is bigger than a smaller TB with 10% opening.. So for drag, I don't think small plenums matter much, as you will be running 100% throttle all the way, so the plenum volume doesn't matter much as it will be for a track car.One of the main reason is, if you have studied map sensor graphs, you are more or less at 100KPa = a.k.a 1bar at full throttle (absolute pressure, not gauge pressure) which means there is no vaccuum in the plenum, so there's not really a volume problem, but rather making it bigger so there's less restriction to flow.</blockquote>

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