Edelbrock Pro-Tuner, User Manual

Page: 129 / 235

Basic Tuning with the Pro Tuner System 129
Tips for Tuning:
It is important to remember that the Accel/Decel strategy will tune deceleration as well
as acceleration and load dump fueling.
Start modifications conservatively!
ALWAYS complete and optimize ALL steady state mapping and idle calibration
before tuning transient running! Otherwise your base fueling may be affected by
transient settings.
You do not want transient fueling hiding deficiencies in the
base steady state calibration.
Start by opening the Accel/Decel tuning chart. For ease of tuning, the tuning chart
will give you a running graph of Delta MAP and Delta TPS and shows the A/F ratio from
the oxygen sensor. You will want to perform throttle stabs and adjust the fuel multiplier
to eliminate momentary lean out compared to your steady state Air/Fuel ratio. Continue
this procedure over various speeds and loads until the Delta TPS and/or Delta MAP tables
have been optimized. NEVER enter a value of less than 1.0 in the tables.
The Delta MAP ordinate which is across the top of the Delta MAP table; is defined as the
difference between the raw or instant MAP sensor value and a filtered value (in kPa).
Thus, a faster rate of change will result in a larger Delta MAP value since the filtered
value will "lag" behind the raw or instant value. The same principle applies to the Delta
TPS table, where the Delta TPS = TPS Raw minus TPS Filtered. This type of ordination
emulates the magnitude and rate of load change that the engine is seeing during a
particular throttle change. A fast throttle change from idle to wide open will appear as a
large delta. A slow rate of change, or a change from one part throttle position to another
- will yield a small delta value. Based upon that delta ordinate and the engine speed; the