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Unit 5302 · 12-14-2005, 12:29 AM

Higher fuel pressure does allow the system to deliver more fuel to the engine. That being said, changing the fuel pressure will not really create a lean/rich fuel mixture so long as you stay within the air fuel ratio tables available to the computer.

As your fuel pressure increases, the EEC will adjust the duration of the injector to bring the air/fuel ratio back into spec.

Increasing fuel pressure may have the advantage of more complete atomization of the fuel, allowing a more efficient and consistent burn. Of course, this depends on what fuel pressure you're running at currently. Anything below 30psi will result in a less than ideal spray pattern and atomization, and I don't expect you'll see any real gains in atomization or efficiency above 40psi.

I'd expect your combination to be producing anywhere from 400-425hp N/A properly tuned. With your 30lb/hr injectors, you won't need anything more than the stock 40psi pressure. Quite frankly, depending on how much power your engine makes, the 30lbers may be a little more than you need, but stepping down to 24lb/hr units would definitely require significantly greater pressure than stock.

12-14-2005, 12:29 AM	#5
Unit 5302 Registered Member Join Date: May 1999 Posts: 5,246	Re: Fuel Pressure Question Higher fuel pressure does allow the system to deliver more fuel to the engine. That being said, changing the fuel pressure will not really create a lean/rich fuel mixture so long as you stay within the air fuel ratio tables available to the computer. As your fuel pressure increases, the EEC will adjust the duration of the injector to bring the air/fuel ratio back into spec. Increasing fuel pressure may have the advantage of more complete atomization of the fuel, allowing a more efficient and consistent burn. Of course, this depends on what fuel pressure you're running at currently. Anything below 30psi will result in a less than ideal spray pattern and atomization, and I don't expect you'll see any real gains in atomization or efficiency above 40psi. I'd expect your combination to be producing anywhere from 400-425hp N/A properly tuned. With your 30lb/hr injectors, you won't need anything more than the stock 40psi pressure. Quite frankly, depending on how much power your engine makes, the 30lbers may be a little more than you need, but stepping down to 24lb/hr units would definitely require significantly greater pressure than stock.