PCM (Computer that controls the Engine) Tuning with the Unichip (new Q version)
The modern-day Multiport Fuel Injection System is made of electrical sensors which observe the particular engine conditions, the Powertrain Control Module (PCM) which controls the system based on return signals from these electrical feedback sensors, and actuators which operate under the control of the Engine Control Module (ECM).
The ECM (Computer that controls the engine) carries out activities such as fuel injection control, idle air control, and ignition timing control.
In addition, the ENGINE CONTROL MODULE (ECM) is equipped with several analysis test modes which usually streamline troubleshooting in the event that a DTC code appears.
The two important maps that you need to control or correct will be the ignition map (timing) as well as , fuel tables (calibrations)
spark ignition timing control
The ignition power transistor centrally located located in the ignition main circuit turns ON and OFF to manage the primary current rate to the ignition coils. This approach regulate the spark timing to be able to deliver the the best ignition timing with respect to the engine working conditions. The ignition timing is decided through the PCM using crank speed, intake air volume, engine coolant temperature (ECT), as well as manifold pressure.
fuel injector solenoid management
The fuel injector open milliseconds (MS) and injector timing remain managed so that the ideal air to fuel mixture is supplied to the engine which will correspond to the continually-changing engine operation requirements. A correctly sized single injector is strategically mounted near the air intake port of each cylinder. Petrol is delivered using pressure (around 55 psi) from the fuel tank to the fuel injectors through the fuel pump motor, with the pressure being regulated by the fuel pressure regulater at around 55 psi. The controlled fuel is distributed evenly to each of the injectors. Fuel injection is usually completed one time for each cylinder for every two rotations of the engine. On a four cylindr motor the firing order is usually 1-3-4-2. Each cylinder will have a dedicated petrol injector. This is called sequential injection. The PCM (Powertrain Control Module) provides a richer air/fuel mixture by carrying out “open-loop” control when the engine is cold or operating under high load conditions in order to maintain engine performance.In addition, when the engine is under normal operating temperature after warming-up, the Electronic Control Module manages the A/F (air to fuel ration) mixture by using the heated Lambda sensor signal to use “closed-loop” control. The closed-loop feedback defines the theoretical air/fuel mixture ratio at which the catalytic converter can obtain the absolute maximum cleansing performance.
With the Unichip Computer you have complete control over these parameters in order to make modifications to the timing and fuel tables. The Unichip has 24 RPM sites in between 100 RPM and 24000 RPM and 13 load sites between closed throttle full throttle position. This equates to 312 possible tuning sites for each map. In turn the Unichip (Q version) will interpolate between each speed and load site 16 times which gives a decent resolution densed map.
UniQ is Unichips most up-to-date software package for tuning engine ECU’s. This software program is a significant change from old style DOS program that has been in operation for over a decade. Take the Unichip Module Tuning software for a test drive and see for youself.
Free Unichip Tuning Software downloads at Unichipwholesale.
Free Unichip Tuning Software available now.
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