KillSwitchNY

i need to know what would be optimal fuel pressure for these mods that i have... i have an adjustable regulator so i want it set right





302 bored .30 over to 306ci
edelbrock rpm performer head
gt40 upper/lower intake
bbk shorty headers
H pipe
MSD 6AL
MSD coil
24# Injectors
255LPH fuel pump
Adjustable fuel pressure regulator set at 47 psi
Mass air conversion
75mm Mass air sensor calibrated for 24 injectors
8mm bosch wires soon to be 9mm motorsport wires or 8.5mm msd wires... wich would you choose?

soon to have 75mm throttle body

HATCHEDIN87

I ran mine at 50 psi on my 89 with many bolt-ons. It seemed to work good there. I would get the 9mm fms wires they are cheaper than the msd and they are just as good.

KillSwitchNY

yeah that is what i am running at now.... 50psi it does seem to be running good there but i wasnt positive if it was the perfect pressure..

as for the wires i wanted to go with msd because someone said the boot angle is adjustable so i can get a 90* angle to keep it from touching the header

although i would rather have the cheaper and larger ford racing wires but i do not know if they have a 90* i think they are 45*


i have autolite pluges that are designed for the edelbrock performer heads i have.... but since the heads take that specific plug the boot is forced to touch the BBK shorty header and it is constantly burning thru and arcing

fordguy17

there is no perfect pressure. it changes with every car/mod/weather.

you could probably set it down seeing that you have a 255lph pump.

put it on a dyno to know for sure.

KillSwitchNY

yeah im trying to mess with it to get it right but for ssome reason at idle even with a ful tak my fuel presure guage bounces between 40 and 45 psi the pump is brand new and is a walbro so i cant see there being anything wrong with the pump....

also do you have a problem that when you have less than 3/4tank right turns drop your fuel pressure for a second


BTW niiicceeeee car i need a cowl hood

primetime5.0

you want to lean the car out not make it richer, i have 32psi in my right now btw you dont need a 75mm tb thats to big

KillSwitchNY

well i wanted to match the mass air sensor with the throttle body....

will a 75mm make my car run worse than say a 70mm? or will it just be pointlessly big?



about the fuel psi.. you say u run 32 isnt stock 43psi? i should go lower than stock? sounds contradicting

KillSwitchNY

i got 8.5mm MSD wires... they are great... i was going to get fms but they only have a 45* boot and will burn on my header the msd clears the super tight spot being that they can be bent to 90* and i noticed a huge difference in rev's and power

KillSwitchNY

any idea what my car should be timed at? and with the mods i mentioned... what do you think my idle should be at ... with the cam it fluctuates between 950 and 1100 rpm