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is it safe to run bigger injectors at a lowwer psi? i wanna get bigger injectors for future mods and dont wanna break n e thing...i also have a s-afc

 
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lower psi... do you have a turbo? Because you'll never need bigger injectors with a normally aspirated (no turbo or supercharger) setup. You might with a larger nitrous setup, but most likely not.

You can run any injector that will fit, as long as you use the S-AFC to tune to a proper air fuel mixture. With larger injectors, you'll have to run them at a reduced duty cycle, which the S-AFC can do, to a point. Just make sure the S-AFC can reduce the fuel map enough to compensate for the larger injectors. My advice would be to wait until you really need them before you install them.

 
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ok so if i have intake header exhaust, cam. cam gear, fuel rail, nos, s-afc, running bigger injectors wont help?

 
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more fuel always helps, as long as you have proper fuel tuning. you don't need to go too large on injectors, maybe just 280cc or 310cc saturated. stock you're at 240cc which is plenty. you otta save your money until you get a much more serious setup.