Edelbrock QwikData 91001 Manual page 19

MPH Example (Measured at Driven Wheel)
The input type should be set to "Frequency Rise". To measure the vehicle speed, you need to calibrate a speed sensor mounted on
the wheel.
To complete the calibration, you must know the rolling radius of the tire being measured, and the number of magnets being used. To
determine the rolling radius of the tire, measure the distance from the center of the wheel to the ground with the car fully loaded and
on level ground. Use the following formula to determine appropriate table value to enter into the calibration table. (See the Manuals
section of the QwikData CD-ROM).
Brake On/Off Example
This is an example of recording a pure digital signal and is the default setting for channel 4. The input type must be set to "Pure
Digital". The calibration numbers are simply (0), (0) and (I), (I). This means that with the input not triggered (input of "0"), the output
for the graphs read "0". With the input triggered (Brake lights "on" in the example), the output reading is "I". The third element is (0),
(0) which indicates to QwikData that this is the end of the calibration table data.
Injector Duty Cycle Example
Duty cycle is the percentage of time that a signal is high or low. Duty cycle is often used to characterize an injector output. The input
type is set for "Duty High" or "Duty Low". (Duty Low is simply 100-Duty High). The calibration numbers are (0), (0), and (100), (100).
The third element is (0), (0) which indicates to QwikData that this is the end of the calibration table data.
Injector On Time Example
Instead of Duty Cycle, you may want to measure the absolute on or off time of the injectors in milliseconds for each firing cycle. Select
"On Time" or "Off Time" for the input type. Ensure that the maximum length of time of the signal is within the pre-set limits of the
system, See "Advanced Options" . The default setting allows you to measure pulse widths of up to 210.5 ms. This is well within the
range of most injector pulses which are usually in the 1 to 30 ms range. So for this example, the calibration numbers can be (0), (0),
and (30), (30).
Note: (We could use any number up to 210.5). The third element is (0), (0) which indicates to QwikData that this is
the end of the calibration table data.
Catalog #91001, 91003, 91004, 91005, 91007, 91009
Rev. 9/06 - RS/mc Page 16 of 47
©2006 Edelbrock Corporation
Brochure #63-0282