This makes a huge difference in the average temperature the engine operates at and prevents run away coolant temps on hot days and high loads. The EVAP model is also safer because the return fuel line has been eliminated and in general, the fuel pressure is lower than the previous rising rate setup.Д®VP has made more power on this model than any previous generation stock turbo - stock injector vehicleOur tunes not only improve boost, fuel, timing, rev limit and speed limit changes, we also help the cooling system issues by lowering the fan on temperature by 20 Deg F. EVP has made more power with our tuning on this model than any previous generation, stock turbo, stock injector vehicle.Stages 1-5R are done using the stock injectors and stock fuel pump! Not only that, our tunes for this vehicle are the most refined we have done for this family of vehicles. In boost, the controller raises the fuel pressure back to 70 psi.The system makes for a much better running and safer setup as compared with earlier models. Once the engine is started, the fuel pressure drops to 40 psi and stays there until the engine sees boost pressure. When the vehicle is keyed on, the fuel pressure initially rises to approximately 70psi.

The controller accomplishes this by raising and lowering the voltage to the pump.

The new hardware includes a separate fuel pump controller which varies the pressure to the fuel rail based upon input from an inline fuel pressure sensor and programming. The biggest change is the fuel system was changed from a return style, rising rate setup to an automotive type return less configuration. For 2019-2021 Polaris made many changes to both the fuel system and tuning of the Bosch ME17 ECU.

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