Quote:
Originally Posted by Denvervet
I am planning on using one of Ricks new efi tanks that is set up for 58psi regulator. Brings up a good question. Why do aftermarket EFI system suggests 42-45psi vs some other pressure? What could or would be the downside of running more or less?
I will be running accel Gen 7 but that's just the ECM . I am not running their regulator or fuel pump, etc.
Is there a difference with how the injectors perform with pressure difference? I can imagine there is but....?
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most of the later model LS stuff is all 58 psi. I have heard the reason they did that was because they also went to returnless systems and the higher pressure helped avoid any vapor lock issues. (actually they still return, but the regulator is built into the fuel filter and bypasses there instead of going to the fuel rails and then bypassing to the tank.
With that said I don't think there's any issue running the higher psi as long as the tune is set up for it; if you convert from a 43 psi tune to 58 psi the higher pressure will make it richer and require re-tuning.
Jody