A larger throttle body might make the car "feel" faster at low speed but it really isn't. The down side is the car can be difficult to drive at parking speeds.
Since a larger throttle body will flow more air per degree of opening, 10% throttle peddle will equal more air over 10% of the smaller one.
This is similar to the round throttle cam sold to hop up a Porsche 924 / 944. All the round cam did was change pedal to throttle blade ratio making the car feel faster.
Late 90's GM Vortec V6 / V8 engines used a single very large throttle body but added a slab to one end of the throttle blade in order to prevent jumpy throttle response at low speed.
See 2:20 4:10
Published on Mar 21, 2012
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Easy free way to gain a noticeably better throttle response. Does not gain horsepower like companies claim. Please read description. Thanks.
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https://www.youtube.com/watch?v=okEDVwlEHvM
The only way a larger throttle body helps is at high speed " if " it is posing a restriction. If you are not maxing out the stock TB, you will see no gain other than a perceived low speed increase.