Quote:
Originally Posted by camcojb
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
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That's not entirely true. On most aftermarket systems once the O2 turns on it'll correct to the programmed air/fuel ratio. The only time it fattens it is in cold start or any other condition that the O2 isn't operating in. Most injectors are rated at 3 bar or 43.5 psi, that's why most regulators are set at that. Some older style injectors get slower as you increase pressure. Doesn't mean much on a programmable Sequential ECM like the Gen 7 but on others it can effect performance, especially at idle. Increased pressure can enhance the spray pattern and atomization though on some injectors, just depends on the type.
OEM stuff works differently. Most of it is programmed to run at stoich throughout much of the rpm range. However they will run richer in power mode with more pressure cuz the O2 turns off and goes to as premapped fuel curve.
If you need help on your Gen 7 let me know. I'm the guy on their website.
Mark