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Mitsubishi Evo X (CZ4A) Fuel System FAQ's

Please read our FAQs page to find out more.

When do Evo X owners need larger injectors?

Beyond basic bolt-ons or when switching to E85, larger injectors prevent maxed duty cycle and maintain safe AFR. Size injectors with headroom for future turbo plans.

Is a high-flow fuel pump required for ethanol on the Evo X?

Yes. E85 needs more volume; upgrade the in-tank pump and wiring if needed to maintain pressure under boost. A retune is mandatory.

Do I need a return-style fuel system on the Evo X at high power?

A return system with an adjustable FPR stabilizes rail pressure and simplifies tuning at elevated flow rates, especially on ethanol blends.