When changing to larger volume injectors, the stock fuel pressure is often to low to fully atomise fuel. Raising the fuel pressure can allow injectors to work at full efficiency.
Also, raising fuel pressure using the standard injectors can increase the fuel flow without changing injectors (Although, it may be worth noting that ,as the load on the fuel pump will be increased due to fuel pressure increase - You may need to upgrade your fuel pump).
Range: 200 ~ 490kPa (2.0 ~ 5.0kgf/cm2)
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