What injector data do I need to enter when installing larger injectors?
- Flow rate is the foundation of the fuel calculation. If it's wrong, the engine never runs right, or the error hides a mechanical problem. Injector setup is among the first steps of any tune.
- Enter the full characterization, not just flow. In one 1,000cc injector swap, the tuner entered the supplied flow rate, offset (dead time) and short-pulse adder data.
- Match the fuel pressure. Injectors are rated at a set pressure, commonly 43.5 psi (3 bar) or 58 psi (4 bar), and flow scales with the square root of the pressure difference. Set the fuel-pressure reference correctly (atmospheric vs manifold-referenced), because flow and dead time both change with differential pressure.
- Use characterized injectors. Fully characterized injectors let the tuner get idle and drivability right.
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