Quote:
Originally Posted by delslo
Because you're crippling output. If the output required to achieve desired speed/distance is fixed, then you need more throttle and rpms to compensate for a reduction in output with a HAI. More throttle/airflow and more revs is load by definition as I understand it. More load requires more fuel as programmed into the ECU by the OEM.
Similarly, the reduced compression effect of less denser air cripples output, compounding the matter.
This is my largest quandary.
|
You appear to be assuming that the engine's ouput isn't variable per the same RPM...
You're correct in that it takes a given output to maintain a given speed, but most engines produce MORE than that given output per the RPM at which they produce the required speed (via the drivetrain).
Therefore, since RPM is fixed per vehicle speed, and necessary output is a constant, the variable is actually throttle position.
If you open the throttle more, (under normal circumstances) you're creating more output, due to more availability of air, and thus more fuel input.
With hotter air, you have to open the throttle just that much more to maintain the same output and engine RPM.
Remembering that RPM and engine output need to remain constant when speed remains constant (on a flat, level surface, assuming that losses are also a constant), the difference between the HAI's apparent effect on power production and the CAI's apparent effect on power production is simply stated by showing the same power production at differing throttle positions.
Once again, if the throttle is opened more, there are less pumping losses per the same output.