Fuel pressure

myroc · Mar 24, 2004

With these mods what should my fuel pressure be set at:
RPM heads and RPM intake
2040 crane cam 1.6 RR ARP head bolts
BBK CAI 70mm TB and EGR and 73mm mass air 24 tube
24# injecters
MSD dig 6 wires and cap
March under pullies
Double roller timing chain
FMS roller lifters
190 forced holley fuel pump
Hurst line lock
TCS 3000 9.5 non loc stall with shift kit,B&M tranny cooler
BBKequal lenght shorties,H-pipe and 2 chanber flowmasters
3:73 gears
And last 100 shot nitrous not used YET and i think thats everthing.

stangbear427 · Mar 24, 2004

40psi @0"vaccuum. Tune it from there with an A/F gauge, wideband, or dyno. If all you have at your disposal for tuning is the seat of your pants, and 40 doesn't feel quite right, step it back to 39, and work your way up from there- x:41,42, etc. 40 will be safe and if not best, close. Where you will notice the if it's right or not is WOT. If it smells or idles funny, it isn't right. The best pressure at WOT won't have any drivability issues. This is for your virgin combo as sig, once you hit the NOS all bets are off. I couldn't tell you for that.

jrichker · Mar 24, 2004

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.

Gearbanger 101 · Mar 24, 2004

jrichker said:
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.

LOL....the poor mans dyno, but it's a good way to go about it.

Fuel pressure

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