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[benmcc2003]

When using aftermarket injectors or pressure sensors follow these specific steps BEFORE attempting to start the vehicle. This will greatly reduce tuning time, and starting problems.

1. Upload the base calibration that is most closely suited for the modifications that you have to your vehicle. These calibrations are located in the AEMPro folder under Startup Calibrations, then by vehicle manufacturer, then part# of the ems with a brief description of any specific modifications from stock.

2. If you have aftermarket injectors, perform the following changes to the calibration
a. Select the injectors from the Injectors wizard under Setup/Injectors from the main menu (See figure A). This will set the proper battery offset for the chosen injectors, but will NOT change the fuel calculations.
b. Open the Fuel map, this can be accomplished by clicking on the Injector button, the Home button, or by pressing ‘ctrl+f’. Once the fuel map is open, press ‘m’ for modify, then select “change injectors/pressure at the bottom of the pop up list. A new window will open asking you to enter the old injector size, and old pressure. Enter the old injector size, and if you are unsure of the pressure, enter 43psi. Then proceed to enter the new injector size, and the new pressure. If the pressure is unchanged, enter 43psi again. This will perform all the fuel changes to accommodate the new injectors. Note: some adjustments will still need to be made.

3. If you have an aftermarket Pressure sensor, run the setup wizard for the pressure sensor under the main menu Setup/sensors/Manifold pressure the click on the ‘W’. This will bring up a new window with a selection of pressure sensors to choose from. Make sure you select the proper sensor, otherwise the engine will NOT run properly. After selecting the sensor from the list, it is IMPERATIVE that you arrange the ignition and fuel tables so the values are returned to the proper pressure ranges. For example: The stock pressure sensor range was –13psi to 11psi and the values for fuel and timing were appropriate in that range. When you change to a 5bar pressure sensor the values that were at 11psi are now at 60psi (Not Good), and the values at –13psi are now at –14.7psi (also not good). The good news is the AEMPro software is designed to rescale the values when pasted in. So after you select your pressure sensor
a. Changing the fuel table

(taken from AEM forum) but needed info.