Mallory Ignition ACCEL DIGITAL NITROUS PROCESSOR 74186 - Manual (Page 3)

3 ACCEL/DFI TECHNICAL SUPPORT 248.380.2780 www.accel-dfi.com
HANDHELD CONTROLLER INSTRUCTIONS
The controller has a 9-pin DSUB socket which plugs into the end
panel. It does not need to be plugged in for the ignition to run,
only to change the settings.
The control “modes’ are listed below. To set the modes, plug the
controller in and turn on the ignition. After a brief pause, the
controller display will light up. Use the “MODE” keys to select the
desired mode, and then use the up/down “VALUE” keys on the
right side to change the values.
Once you have finished with your settings, you can either turn the
power off and unplug the controller, or just leave it plugged in.
PROGRAMMING USING HANDHELD PROGRAMMER
Display Range/Resolution Explanation
Engine RPM NO2/Status 10 RPM Actual Engine RPM and NO2 Status
NO2 Delivery
Four choices of No2 Delivery.
1st 100% On (No time or RPM PWM)
2nd RPM Control
3rd Time Control
4th RPM & Time Control
100% ON
NO2 turns on full with any pulse width modulations on the
programmed thresholds are met.
NO2 Settings
Start RPM
1000-12700
RPM/100 RPM
RPM where the nitrous system starts working. Lowering the
value until the display says “OFF” disables this function.
RPM Control
1000-12700
RPM/100 RPM
The software linearly increases the duty cycle percentage as
a function of RPM between the two (N2O Start and N2O
100%) values. This RPM setting should be 1000 RPM above
the activation RPM.
NOTE: Regardless of the nitrous settings, the nitrous
system is shut off 300 RPM before the main RPM limiter.
Time Control
.0 to 20.0 seconds/
.1 second increments
Launch time modulates the pulse width as a function of
time. This is useful when traction becomes a problem.
Once the arming and triggering conditions are met, the
launch timer modulates the solenoids to help with tire spin.
For example: If Launch time is set at 5 seconds and when
the NO2 activates, the pulsing of the solenoids will increase
as the time set decreases. (.1second 1% Flow 5 second
100% Flow)
RPM & Time
Control
1000-12700/
.1 – 20 Seconds
This mode is useful for a car with a loose converter or a
weak clutch. It prevents the user from driving through the
converter with the NO2 full on. It allows the user to have
complete control over ramping the power in, so that when
the NO2 is at 100%, the full power of the Nitrous hit is well
past the converter RPM threshold. (Example of this is on
page 18)