Fuel injector regulator testing
03-10-2011, 08:03 AM
#5
3rd Gear Member
Join Date: May 2008
Location: FLORIDA
Posts: 738
Increasing fuel pressure on a stock or “bolt on” Mustang is going to do more harm than good. Everyone thinks bigger is better but that is rarely the case with anything. When you increase your fuel pressure the EEC will reduce the injector duty cycle because the oxygen sensors will tell the EEC that the engine is running rich. Even worse, the EEC could get confused enough and go into limp mode causing the car to run poorly. On stock or close to stock Mustangs there is actually a benefit to reducing the fuel pressure to about 28-30lbs. This is typically worth about 4-5 horsepower across the entire rpm range. Once again, bigger is not always better. Don’t increase fuel pressure unless the engine requires it. Removing the vacuum line is not a good idea either. All you are doing there is raising the fuel pressure at idle and part throttle without changing it at wide open throttle. This will get you some worse fuel economy and most likely worse performance. If it is bad get one you can adjust and get a gauge with it.
03-10-2011, 08:12 AM
#6
Banned
Join Date: Dec 2005
Location: Lil' Rhody
Posts: 22,376
Increasing fuel pressure on a stock or “bolt on” Mustang is going to do more harm than good. Everyone thinks bigger is better but that is rarely the case with anything. When you increase your fuel pressure the EEC will reduce the injector duty cycle because the oxygen sensors will tell the EEC that the engine is running rich. Even worse, the EEC could get confused enough and go into limp mode causing the car to run poorly. On stock or close to stock Mustangs there is actually a benefit to reducing the fuel pressure to about 28-30lbs. This is typically worth about 4-5 horsepower across the entire rpm range. Once again, bigger is not always better. Don’t increase fuel pressure unless the engine requires it. Removing the vacuum line is not a good idea either. All you are doing there is raising the fuel pressure at idle and part throttle without changing it at wide open throttle. This will get you some worse fuel economy and most likely worse performance. If it is bad get one you can adjust and get a gauge with it.
03-10-2011, 08:28 AM
#7
3rd Gear Member
Join Date: May 2008
Location: FLORIDA
Posts: 738
I was just giving him the fundamentals on that part of the fuel system. Nothing bad in what i did.
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V6 (1994-2004) Mustangs
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