Edelbrock Pro-Tuner, Руководство пользователя

Страница: 175 / 235

Advanced Tuning with the Pro Tuner System 175
•
The idle control gains - (bottom array of slide controls) will tune the behavior of
the idle controller. During idle mode, your ECM will control the idle speed by
automatically adjusting spark advance and idle airflow. These sliders let you tune
the system for your combination.
As you increase the gains, the controller will become more aggressive. If the idle
droops severely and the controller is slow, you may want to increase the gain to
prevent stalling or other problems. If the gains are too aggressive, the engine will
become unstable, surge, or otherwise be too erratic.
You need to experiment with your engine to find the right combination of gains for
the Idle Air Control valve (IAC) and the Spark control.
•
The user command buttons on the right side of the panel contain important aids
to tuning your idle. By depressing the Tuning Chart button, a tuning chart will
come up - displaying your spark, idle speed, and IAC duty cycle.
This running chart should be used to aid you in deriving the most stable idle your
engine is capable of. you can monitor the rpm fluctuation and use the gain sliders to
minimize it.
Also available are buttons to lock fuel and/or lock the spark. This is very helpful to
isolate the interaction of one or the other. For instance, by depressing the spark and
fuel lock button, the spark will not be allowed to move; letting you see the tuning
effect of the IAC only on the engine's stability. The theory behind the PID gains is
not covered within this document, but many resources are available for those
interested in learning more about it.
Tuning Tips:
•
Tune only enough to get the engine idling reasonably.
•
Set the throttle blade to provide 30% IAC duty cycle when at operating
temperature and no load on engine.
•
Rescale the TPS sensor using the TPS SETUP feature under the "Tools"
menu.
•
Then complete ALL base calibration mapping on the spark, AFR target, and
VE maps.
The values in these base maps will affect your idle tune, so you will want to
finalize them before spending a lot of time fine tuning idle quality. Make sure
spark, fuel, and VE are smooth and relatively flat at the idle set point.
Once you have completed all base map calibrations and are ready to optimize
the idle, start by having the P,I, and D gains as low as possible.
The most common error is tuning the controller too aggressively. Gains too high will
cause unstable running. If the gains are too low, the idle controller will not react fast
enough; causing instability, RPM variation, or engine stalling on hard deceleration. USE
THE TUNING CHART BUTTON TO DISPLAY A RUNNING CHART OF IDLE PARAMETERS.
TUNE THE PARAMETERS TO OBTAIN THE LEAST RPM VARIATION (SMOOTHEST IDLE).