Quote:
Originally Posted by supremeefi
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
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that's not entirely true............
Do you tune a car just enough to get it so closed loop can add or subtract and keep the desired a/f? Or do you tune it so the add/subtract from the O2's is minimal when in closed loop? Bottom line, bumping pressure from 43.5 to 58 psi is going to richen the a/f, and should be accompanied with a tuning change. My humble opinion anyway..........
Jody