Quote:
Originally Posted by toomuch
Hypothetical and demonstrational situation:
So normally, if one is cruising along at 55mph, say the car needs 25 units of power to do this. And to achieve this power the engine needs to run at 2200 rpm.
Now say one has a WAI. Cruising at 2200 rpm, the engine is pulling in less air, and so it is making 24 units of power, and runs at 53 mph. In order to cruise at 55mph, the engine needs to run faster, at 2250 rpms to achieve 25 units of power.
Next, the same vehicle as a CAI. Cruising at 2200 rpm, the engine is pulling in more air, and so it is making 26 units of power, and runs at 57 mph. In order to cruise at 55mph, the engine needs to run slower, at 2150 rpms to achieve 25 units of power.
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Augh! please don't take this personally, but this couldn't be more wrong. If your wheels are going 55 mph, your engine is turning at only one RPM ever (assuming you are in the same gear, automatic or manual doesn't matter). If you're going 55 mph, your engine will be at say 2200 rpm, whether or not you are flooring it or coasting or whatnot. There is a physical, geared linkage between the wheels and motor, with an exact ratio of # of turns of the engine to # of turns to the wheels. If you measure in your car (in one particular gear) the engine speed at a particular wheel speed, that ratio will always hold up in that gear no matter what. The only single caveat I can think of is an automatic transmission when it's not in lockup mode, but that isn't because of the reasons you list at all.