First i was wondering what stock fuel pressure was on a 5.0. im wondering this because i installed a 255lph intank fuel pump and i have an Aeromotive adjustable fuel pressure regulator on the way. I here that if you bump the timing up and fuel pressure you will gain a few ponies. what should the timing be bumped up to and where should my fuel pressure be with all the bolt ons( gear, cold air intake, upper and lower intake, pullies, headers and flowmasters).
fuel pressure & Timing
- Thread starter yelbigbirdlow
- Start date
Stock FP is 37-39 PSI at idle,vacuum disconnected from the regulator and capped.
Get one of your buddies to ride along with you. Find a level stretch of road where you can do some testing. Don't choose a speed range that will make you shift gears, the shift quality & speed will affect your results. Use 2nd or 3rd gear and do a run from 2000 RPM to 5800 RPM. Call out the RPM as it increases and have you buddy record it and the elapsed time. If you have one of those cheap digital watches like I do, a stop watch is built in. Start the fuel pressure at 36 PSI, vacuum off and make a run. Turn it up to 37 and make another. Be sure to reconnect the vacuum every time you set the pressure. Keep turning up the pressure and making runs until you notice a drop off in time. If your bud was careful to record the results, you'll have a nice chart to use to find the optimum pressure.
Stock timing is 10*, use 14* and expect to use 89-93 octane gas with iron heads.
You'l get more kick by advancing the timing than playing with the fuel pressure on a mostly stock engine.
Get one of your buddies to ride along with you. Find a level stretch of road where you can do some testing. Don't choose a speed range that will make you shift gears, the shift quality & speed will affect your results. Use 2nd or 3rd gear and do a run from 2000 RPM to 5800 RPM. Call out the RPM as it increases and have you buddy record it and the elapsed time. If you have one of those cheap digital watches like I do, a stop watch is built in. Start the fuel pressure at 36 PSI, vacuum off and make a run. Turn it up to 37 and make another. Be sure to reconnect the vacuum every time you set the pressure. Keep turning up the pressure and making runs until you notice a drop off in time. If your bud was careful to record the results, you'll have a nice chart to use to find the optimum pressure.
Stock timing is 10*, use 14* and expect to use 89-93 octane gas with iron heads.
You'l get more kick by advancing the timing than playing with the fuel pressure on a mostly stock engine.
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