fuel preasure setting?

[stang_racer69]

What do you guys run on your fuel preasure with simular combos to mine? I set it to 40 with the vacum off for a base and it is around 30 with the vacum on.



Cobra intake
65mm TB
75mm mass air
24.lb injectors
afpr

shorty headers
off road exahust
underdrives
14* timing with spout off

 

[Rick 91GT]

I start at 38psi (vac off) and go up in 1/2 pound increments

 

[jrichker]

Use the SOP meter...

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.

 

[stang_racer69]

I'll have to try that, thanks jrichker