Innovate Motorsports LogWorks 3 - Manual (Page 127)

LogWorks3_Manual_1.01.doc - 127 -
and acts against the acceleration force, it must be accounted for. The frontal area and Cd value
for many cars can be found here:
http://www.mayfco.com/tbls.htm
The resulting values are corrected for different meteorological conditions as well as using
standard SAE correction.
To use the power calculations correctly, use the selection tool to select ONLY the areas of
full throttle at the correct gear.
The results should not be relied upon in the areas at the edges of the selected areas. Rounding
of the signal by smoothing will affect the calculated results at about 1 second from the edges if a
smooth value of 1 second is used. Smoothing is required for calculations involving slopes
because slope calculations will vastly exaggerate any noise or digitizing artifacts in the signal.
These artifacts show up as oscillations on top of the calculated channel.
The required data to be entered must be as accurate as possible. The vehicle weight entered is
the weight as tested, incl. fuel, liquids and driver, not the dry weight.
The aerodynamic force calculations are based on dry air. The published numbers by the
manufacturers might be on the low side of actual, even for an unmodified vehicle. Addition of
aerodynamic devices like wings, splitters, side-skirts and so on can drastically change the cd-
value and frontal area. The same is true for wider tires, lowering and so on.
NOTE:
These calculations should be used to compare the results of modifications made to
fueling and/or timing and their relative effects on power and torque. They are NOT
intended as replacement for dyno time if the actual power and torque numbers are needed.
Torque/power from Accel/RPM
This calculation uses primarily the acceleration channel from the LMA-3 and RPM to calculate
torque and power. It also uses the tire diameter and gear ratios to calculate speed for the
aerodynamic force calculations.
Torque/Power from speed and acceleration signal
This calculation uses a speed signal input and acceleration signal from the LMA-3 to calculate
torque and power.