Edelbrock 3670 User Manual - page 201
Features Available with Pro option only
201
adapted operation where it is unnecessary to attempt to adapt further. When entering
values in the other cells: TAKE GREAT CARE - DO NOT PUT TOO LARGE OF VALUE IN
THIS TABLE! A large value can cause erratic adaptation and poor running because it can
adapt a false value captured during a misfire, IAC modulation, or other nearly instant or
non-typical running condition. Generally, the slower the adaptation - the better; because
it will adapt based on a larger sample size and give the ECU a more complete picture of
true airflow.
If you are only running MAF during tuning,
be sure to deselect the sensor in the
setup wizard after the adaptive learn has been completed to return to normal
speed/density operation and prevent sensor faults from being displayed when
MAF is unplugged.
It is recommended that you then open the VE map and manually
smooth any surfaces that were not fully adapted. Such as in the corners of the map
where it may be difficult to run.
In addition to (or instead of) adaptation of airflow (VE) with MAF sensor/s in Speed/
Density mode, the system can be setup to run single or dual approved switching OR
wideband oxygen sensors in all control modes: Alpha-N (speed/throttle), MAP-N (Speed/
Pressure), or true Speed/Density modes. The oxygen sensor provides feedback on the
engine's current air/fuel ratio, which provides the ECU with the data needed for
adaptation of the fueling in order for the system to deliver the calibrated air/fuel ratio.
For more information regarding closed loop operation and adaptive functions, see the
section on Adaptive Tuning Capabilities.
MAP Fuel Trim Table
(Pro Option Only, Not Available in Speed
Density or MAP-N Mode)
In Speed/Throttle (Alpha-N) mode, there is the ability to adjust a global trim for fuel
based upon MAP. This can be useful if fueling characteristics change greatly with ambient
pressure. An example would be drag racing with a large air inlet where there is a "ram
effect" as the car gains ground speed. This table can be used to compensate fueling for
such conditions.
While not often needed, the MAP Fuel Trim table can be helpful in providing a global
fuel offset for a variety of intake charge pressures. This table is not necessary in Speed/
Density mode, as charge pressure is automatically compensated for. The table is
viewable in MAP-N mode and values can be entered. Changes will have no influence on
tuning though.
Tips for tuning
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