Hi guys....
About the MAP ECU and UniChip.
All Fuel Injection cars has ECU. In which, it controls the Air intake, throttle position, RPM/REV, Injector timing and others....
So, upgrading the ECU can be expensive. (Example, change Civic EG9 ori ECU to a Mugen or Spoon will cost you a boom) Audi, Volvo ECU upgrade alone is about 7k~9k.
Now, engine kosong with fixed cam loop and standard piston, injectors, throttle body need a brain to runs it. so start the car, the ECU need to tell the injector to pump fuel when and how much. Now let think about binary and ECU control in terms of voltage from 0V ~ 5V. (example, no air in AFM = 0V, Max air=5V, atmosphere pressure in manifold = 5V and -10PSI = 0V)
So if your feilo now "average" driving at about 2500RPM, your AFM shows 0.5V, pressure at 0.5V, you ECU is pumping fuel to your injector based on AFM 0.5V and match the air intake. Say your FC is about 18cents/KM now.
So, if you put in a piggy back MAP-ECU, based on Manifold Absolute Pressure you will be able to map your AFM voltage accourding to your RPM, throttle position and manifold pressure. so at 2500RPM, you get the MAP ECU to tell your car's ECU that the current AFM voltage is 0.45V only. With that, your ECU will reduce the fuel mixture to your engine.
With this, you get to cut fuel when you don't need power.
Then, at 2500RPM, if your manifold pressure changes! meaning you slam on the throttle, you pressure in the manifold will drop to near atmosphere 0 PSI indicating alots of air rushing in...you will change your setting in the MAP ECU to have your AFM voltage get to 1.5V and this instruct the car's ECU to pump more Fuel!
With this, you only apply fuel when you need it and your can max up the fuel pumping by cheating the ECU! Good for those cars that using open port air filters or changes to larger throttle body.
Whatever i share above is a bit different when you have a force induction motor. Where manifold will have + pressure or more then atmospheric pressure aka boost.
its crazy.
