fuel system for 400-450hp

procharge94 · 01-30-2005, 11:53 PM

I plan on tuning my car for a conservative 400-450hp once the blower is hooked up. Will the stock fuel lines and fuel rails support this amount of horsepower, considering the fuel will be fighting about 10lbs of pressure inside the intake manifold? I currently have a 255 pump and an adjustable fuel pressure regulator that is boost sensitive. The car is a road course car, so reliability and consistency are crucial. I will NOT be using an FMU. I plan on using 42lb injectors as well.

Dave_mustang_50 · 01-31-2005, 11:17 AM

I`m detunned to 480 rwhp until my lines and rails are changed out by my speed shop. I would think you would be fine , im not sure what there rated for though.

procharge94 · 01-31-2005, 03:00 PM

What about injectors? I currently have 30lb injectors with a 255 pump. Will I be able to push enough fuel pressure in order to keep the motor in a good air/fuel range?

Dave_mustang_50 · 02-01-2005, 08:58 AM

I would stick with using the 42`s and no fmu myself.

Stang_Crazy · 02-01-2005, 03:35 PM

You'll be fine with the stock lines and rails. I agree with 42's and the 255lph pump.

drudis · 02-01-2005, 09:47 PM

I run 500rwhp with a 255 and 42# and no FMU (just custom chip).

87Saleen197 · 02-02-2005, 03:17 AM

508rwhp on stock rails and 38# inj. with a 255lph in tank and a T-rex inline. No problems.

procharge94 · 02-02-2005, 05:21 PM

My fear is that with 42lb injectors, and only putting down about 425 to the wheels, that I will have to turn the fuel pressure down too much. I was personally certain of my stock fuel rails and lines, but just wanted some outside confirmation.

ohnothe5.0 · 02-03-2005, 12:00 AM

how do u turn down your fuel pressure ?

procharge94 · 02-03-2005, 06:08 PM

With an adjustable fuel pressure regulator.

01-30-2005, 11:53 PM	#1
procharge94 Registered Member Join Date: Oct 2004 Location: Gainesville, FL Posts: 103	fuel system for 400-450hp I plan on tuning my car for a conservative 400-450hp once the blower is hooked up. Will the stock fuel lines and fuel rails support this amount of horsepower, considering the fuel will be fighting about 10lbs of pressure inside the intake manifold? I currently have a 255 pump and an adjustable fuel pressure regulator that is boost sensitive. The car is a road course car, so reliability and consistency are crucial. I will NOT be using an FMU. I plan on using 42lb injectors as well.

01-31-2005, 11:17 AM	#2
Dave_mustang_50 Registered Member Join Date: Aug 1999 Location: New Port Richey, Florida Posts: 483	Re: fuel system for 400-450hp I`m detunned to 480 rwhp until my lines and rails are changed out by my speed shop. I would think you would be fine , im not sure what there rated for though. __________________ 1969 Mach 1 351C with a c6(for now) Sold 92 Rag Top GT Procharged & intercooled DSS 331 LC Holley Systemax 2 Intake, Edelbrock RPM Heads,E 303 ,blow thru air meter, race bypass, 42 pph injectors,65mm tb,1.7 rr, Mac long tube headers w/off road H pipe, Force 2 catback, TKO,Pro 5.0, K&N, Alum DS,3 core radiator, subframe connectors,3.73`s, Nitto DR`s and a Heavy Foot.

01-31-2005, 03:00 PM	#3
procharge94 Registered Member Join Date: Oct 2004 Location: Gainesville, FL Posts: 103	Re: fuel system for 400-450hp What about injectors? I currently have 30lb injectors with a 255 pump. Will I be able to push enough fuel pressure in order to keep the motor in a good air/fuel range?

02-01-2005, 08:58 AM	#4
Dave_mustang_50 Registered Member Join Date: Aug 1999 Location: New Port Richey, Florida Posts: 483	Re: fuel system for 400-450hp I would stick with using the 42`s and no fmu myself. __________________ 1969 Mach 1 351C with a c6(for now) Sold 92 Rag Top GT Procharged & intercooled DSS 331 LC Holley Systemax 2 Intake, Edelbrock RPM Heads,E 303 ,blow thru air meter, race bypass, 42 pph injectors,65mm tb,1.7 rr, Mac long tube headers w/off road H pipe, Force 2 catback, TKO,Pro 5.0, K&N, Alum DS,3 core radiator, subframe connectors,3.73`s, Nitto DR`s and a Heavy Foot.

02-01-2005, 03:35 PM	#5
Stang_Crazy It's never clean enough! Join Date: Jan 1999 Location: Shaler, PA Posts: 1,542	Re: fuel system for 400-450hp You'll be fine with the stock lines and rails. I agree with 42's and the 255lph pump. __________________ ~Dan 2001 SVT Lightning 89' GT : Taking up garage space and waiting for a buyer... Rice Hater's Club - Member #11

02-01-2005, 09:47 PM	#6
drudis Moderator Join Date: Dec 1999 Location: Livonia, MI, USA Posts: 1,194	Re: fuel system for 400-450hp I run 500rwhp with a 255 and 42# and no FMU (just custom chip). __________________ Darius Rudis, Moderator Corner Carvers Delight 1989 Mustang LX - Open Track Car http://www.dariusrudis.com

02-02-2005, 03:17 AM	#7
87Saleen197 Registered Member Join Date: Dec 2004 Location: Douglasville, Ga. Posts: 4	Re: fuel system for 400-450hp 508rwhp on stock rails and 38# inj. with a 255lph in tank and a T-rex inline. No problems. __________________ 1987 Saleen #0197 restored. Dyno Sheet Saleen/Vortech intake lower ported. Edelbrock heads, Cobra 1.7RR, B303 cam, mac 1 5/8 shorties unequals offroad H pipe, 2chamber flowmasters, Pro M-80 maf, MAC 70TB, 38# inj. Vortech S-trim. 3.12" and 6.87" pulleys, Unlimted Performance PowerPipe. FRPP harmonic Balancer and spacer. Tremec TKO and SPEC stage 4 clutch, Steeda Tri-Ax shifter. 508.2rwhp / 465rwtq SAE corrected, with 14# of boost.

02-02-2005, 05:21 PM	#8
procharge94 Registered Member Join Date: Oct 2004 Location: Gainesville, FL Posts: 103	Re: fuel system for 400-450hp My fear is that with 42lb injectors, and only putting down about 425 to the wheels, that I will have to turn the fuel pressure down too much. I was personally certain of my stock fuel rails and lines, but just wanted some outside confirmation.

02-03-2005, 12:00 AM	#9
ohnothe5.0 Registered Member Join Date: Jun 2004 Posts: 5	Re: fuel system for 400-450hp how do u turn down your fuel pressure ?

02-03-2005, 06:08 PM	#10
procharge94 Registered Member Join Date: Oct 2004 Location: Gainesville, FL Posts: 103	Re: fuel system for 400-450hp With an adjustable fuel pressure regulator.

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