fuel pressure question

speedy2000ls

New Member
here is my set up:
t3 turbo
12:1 fmu
xs power ic 24x12x3 3in inlets and outlets
2.5 ic piping
2.5 down pipe and exhaust
drag manifold
xs power wastegate 8.9 spring
b&m fuel press reg.
STOCK injectors
STOCK fuel rail

my question is what should my fuel pressure during
regular idle
and
wide open throttle

same question except add a warlbro 255 fuel pump
 

slow_99integra

Stinkin & Drinkin
35-40psi on idle, keep that stock.

and the 12:1 fmu means 12 extra pounds of fuel PER cylinder PER pound of boost. this is constant and cannot be changed

so that means 35 psi idle your run 7psi that is 7x12+35=119psi of fuel at WOT.

way too much fuel, get an wideband O2 sensor and check your air fuel ratio. forced fed car need to be around 12:1. you are probebly close to 10:1 or maybe less
 

slow_99integra

Stinkin & Drinkin
speedy2000ls said:
what about after i install my 255 fuel pump
Click to expand...
that doesn't fix your air/fuel ratio, that just allows you to pump that much fuel. hook a wideband up to it, you will see what i am talking about

i have a JRSC and that has a 5:1 FMU, we leaned out some fuel and i gained almost 10whp on the dyno. my air/fuel ratio was 11:1 too rich. so at WOT i have 70psi of fuel.
 


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