COMPUSHIFT II Manual – COMPUSHIFT II Manual
Monitoring & Tuning Your System
–
53
Automatic
4.2.6 Number of Engine Cylinders
If you connect a tachometer signal to COMPUSHIFT II (recommended), you need to tell COMPUSHIFT II how many
times per engine revolution your tachometer signal fires. The frequency of this signal varies depending on the
number and arrangement of engine cylinders.
Common Settings
The following table shows the usual relationship between engine type and pulses per revolution (PPR) for different
types of gas engines:
Engine Type
Tachometer Pulses Per Revolution
V8
4
V6 or Inline 6
3
Inline 4
2
V12
6
Crank sensor
1
Number of Engine
Cylinders
8
Be aware! In manual mode, you are in control of the shifting. This means if you place the lever in fourth-
gear position, the vehicle will be in fourth gear, even from a stop. Use care when operating the
transmission in manual mode -- there is potential for overheating the torque converter or other vehicle
damage. This mode is not recommended for street use.
You should check with your ignition, engine, or vehicle vendor to confirm this setting.