Edelbrock Pro-Tuner, User Manual

Page: 193 / 235

Features Available with Pro option only 193
Tips for tuning:
The fueling maps for each cylinder act as multipliers, offsetting the fuel from the base
value. That is, a value of 1.0 is
NO change from the base fueling. A multiplier greater or
less than 1.0 will change the fueling for that cylinder by that percentage from the base
value. Do not attempt to adjust cylinders individually until the overall base fuel and
ignition calibration is complete, otherwise you will not get an accurate picture of what
each cylinder may need for minor adjustment.
When ready to tune individual cylinders, only adjust the furthest ones away from the
average. For example, if you want to richen the #4 cylinder (pictured) at 1800 rpm/ light
load by 4.0%; you would enter 1.04 into the map at 1800 rpm and the corresponding
load's cell. If you want to lean it out 5%, you would enter .95 in that cell. You can think
of the "1.00" value as 100% of base fueling. You would go richer and leaner from that
point, treating the change as a percentage value.
DO NOT ENTER "0" INTO THE MAP!
This will effectively shut off fuel to the affected cylinder at that point, and severely lean it
out near that point.
Engine damage could result!
Be conservative. Make small incremental changes and note the effect. Never offset
cylinders before completing good base map calibrations.
It is strongly advised not to tune individual cylinders without proper
instrumentation
in place to provide tuner feedback. EGT, per cylinder O2 sensors, or
other combustion pressure analysis is recommended to measure each cylinder and its
response to map changes. Without instrumentation, you are only guessing - and could
easily cause damage to your engine!
Note that the load scaling of ALL maps will be automatically be based upon the type of
fueling method which you have chosen. ECM48 systems have injectors "Paired" together
in 4 pairs. Any change in fuel mult maps will affect BOTH cylinders in that pair. Tune to
be within the safe limits of the leanest cylinder in the pair.
Individual Cylinder Spark Control (Pro Option Only)
With the Pro USB key, individual cylinder control of ignition timing is available by
adjusting the
Cyl1-8SparkOfstMaps . These maps apply an offset (positive or negative)