AEM 30-6905 Universal Programmable EMS-4 - Manual (Page 240)

Page 240 of 279 EMS-4 Install and Tuning Guide_Rev 1.6
Traction Control Tuning Procedure
1. If the vehicle has a manual transmission with no gear position sensor, use the
Configure Gear Ratio Wizard to setup the gear ratio table. If the vehicle has an
automatic transmission with a gear position sensor, select the option TC Gear from
Sensor.
2. AEM recommends starting with the following options settings for calculating Raw Engine
Acceleration:
TC Speed/Time = ONTC Timebase = OFF
3. With the option Traction Control turned off, log the channels Engine Accel raw and
Engine Speed under hard vehicle acceleration through each gear with optimum traction
conditions.
4. Review Engine Accel raw to determine a maximum acceleration rate. Define this value
using the option TC Max.
5. Use the sensitivity tables to adjust the acceleration sensitivity at varying engine or
vehicle speeds. If vehicle speed is used, the option TC vs Road Speed must be
enabled. The parameter Engine Accel Rate can be viewed or logged to see the results.
6. Once the sensitivity tables are defined and a good signal for Engine Accel Rate is
established under optimum traction, define the trip tables. This should be just above the
values for Engine Accel Rate under optimum traction conditions in each gear.
7. Start with the TC Ign Retard option by defining the amount of retard (20 deg is a good
starting point). Define the TC Ign Retard Resto option (2 deg is a good starting point).
These settings will retard the spark timing 20 degrees when thetrip limits are exceeded
and will restore the timing 2 degrees per engine revolution when the accel rate falls
below the trip limits.
8. Enable traction control by selection the option Traction Control from the option list.
9. The settings and results can be tested under free-rev conditions by lowering the trip
table limits until the traction control functions activate: