[Diy_efi] Area under torque curve?

Marcell Gal cell at x-dsl.hu
Sat Jan 4 00:43:13 GMT 2003


Hi,

> Power in linear motion is force times velocity; in rotational motion
> it's torque times omega, where omega is the angular velocity in
> radians/sec

correct.

> Since the area
> under the curve has units of power, if you multiply by time you get
> energy.

The area under the torque curve from RPM1 .. RPM2 does NOT show power.
To get power, you have to multiply torque by _RPM_ 
(actually omega, which is RPM/60*2*pi) _NOT RPMdiff_  ( RPM2-RPM1)!

The torque curve is informative since it is flatter than the power curve
 (and it's like VE).

    Marcell

A common misconcept that high torque is more important than high power.
Power accelerates car, not torque. (One can simply make a low rpm motor
with extremely high torque). Reasonable power in a reasonable rpm-range makes
an engine reasonable ;-)
If you really want some "area", you should look at the average power
in a range that reflects your gear ratios, somewhere around RPM of maxP.
Than you almost know at which points you should change gears for
max acceleration and what performance to expect.

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