It defies all the laws of physics to expect the same or more power from less oxygen delivered to an internal combustion engine.
An intake choke physically restricts oxygen delivery, anywhere it exists in the intake duct.
It doesn't matter what fudged or mis-labled charts, graphs, and opinions of uneducated, biased persons are presented here, regardless of their nationality.
Octane combustion is a chemical process and is pretty well known in the scientific community:
2 C8H18 + 25 O2 → 16 CO2 + 18 H2O
Note the essential ingredient O2 in the process. Nearly every Internal Combustion hop up in history involves getting more air (oxygen) into the combustion chamber in order to pair it with more hydrocarbons to yield increased power output. Less inlet air restriction, velocity stacks, larger air filter area, ram air, turbos, superchargers, have all been key players, and all function to increase O2 delivery to the combustion chamber.
NASCAR dictates restrictor plates in the induction path for the expressed purpose of limiting and equalizing horsepower among contestants. It is very effective at limiting speeds.
https://en.wikipedia.org/wiki/Restrictor_plateTo cling to the notion that restricting air delivery has no impact on engine power availability, is blind folly, or an overt attempt to corrupt reader's understanding of how things actually work in the real world without regard to rational thought processes, or scientific understanding.
Magazine articles are not required to adhere to the scientific process, only to promote sales of more magazine articles by appeasing the reader's psyche.
You, as a reader, require oxygen to function. Do you think you could work harder with less oxygen available to you? Try climbing a mountain.
Finally, putting a restrictor plate at the intake duct entrance modifies the vacuum profile inside the entire intake duct, including the carbs. All behavior or fuel metering orifices, must be altered to supply the motor with equitable ratios. A crankcase breather system connected to the intake tract would also experience more drastic air flows due to the increase suction.
Such behavior is in no way representative of all the carbs in the USA (and most of the world). To take your tuning and operation queues from such a dissimilar model, is ill advised, at best.
If, however, you have 649A carbs, then there is some merit to wrote, mindless following, and do operate with that inlet restrictor plate and filter box. I'll watch for you in my rear view mirror, should you escape countries where they were mandated by political interests.
Oh, and I will continue to use partial choke while driving whenever necessary. I'm smart enough and educated enough to know when it is appropriate.
Works for me!
