fuel rail?

mudchucker · 12-31-2006, 11:55 AM

Hey guys, what advantage does an aftermarket fuel rail have over the stock one, other than the looks? I need to get a rail that has a fitting to test the pressure and mine does not have it. Any thoughts are greatly appreciated.

Thanks

Unit 5302 · 01-01-2007, 02:01 PM

Aftermarket fuel rails need to be used in very high horsepower applications because their larger I.D. allows for greater fuel flow. There is some dissent as to where the stock rails no longer provide enough fuel flow in terms of horsepower (this is especially so because so few cars actually need them), but I don't think you should start even comtemplating them until you're at or above 500hp or so. Unless you want them for looks, that is.

Jeff Chambers · 01-01-2007, 02:23 PM

Like Unit says, higher horsepower applications really benefit from the increased fuel flow. However, even moderate HP applications can see an improvement with reduced starvation at the injectors, particularly because of the 6-5 pulse. On the engine dyno, we've seen lower EGT's on #5 with an aftermarket rail because it isn't so affected by #6 firing right in front of it.

mudchucker · 01-02-2007, 09:16 AM

Thanks guys!!!!!

Coupe50h · 01-02-2007, 06:15 PM

Did anyone really help this guy?
What year car? mods?
There is a factory shcrader valve on the fuel rail on all efi 5.0's to my knowledge, actually it's on the fuel line coming up from the passenger side lower area, and the stock regulator can be replaced with an adjustable one.
later

Jeff Chambers · 01-02-2007, 09:06 PM

Good read Coupe.....missed the second part of the question. Correct. Use the schrader valve on the factory rails. You can buy complete gauge kits from Accel, BBK and others. You can also get a temporary fuel pressure test kit from Actron at Sears for about $40 that will have fittings to work with most import and domestic systems.

Coupe50h · 01-04-2007, 01:28 AM

Quote:

Originally Posted by Jeff Chambers

Good read Coupe.....missed the second part of the question. Correct. Use the schrader valve on the factory rails. You can buy complete gauge kits from Accel, BBK and others. You can also get a temporary fuel pressure test kit from Actron at Sears for about $40 that will have fittings to work with most import and domestic systems.

Didnt mean to sound rude, you and unit are two guys I would be glad to see in my 'help me' post

I guess I read between the lines on that one lol.......
Later

12-31-2006, 11:55 AM	#1
mudchucker Registered Member Join Date: Mar 2004 Posts: 73	fuel rail? Hey guys, what advantage does an aftermarket fuel rail have over the stock one, other than the looks? I need to get a rail that has a fitting to test the pressure and mine does not have it. Any thoughts are greatly appreciated. Thanks

01-01-2007, 02:01 PM	#2
Unit 5302 Registered Member Join Date: May 1999 Posts: 5,246	Re: fuel rail? Aftermarket fuel rails need to be used in very high horsepower applications because their larger I.D. allows for greater fuel flow. There is some dissent as to where the stock rails no longer provide enough fuel flow in terms of horsepower (this is especially so because so few cars actually need them), but I don't think you should start even comtemplating them until you're at or above 500hp or so. Unless you want them for looks, that is.

01-01-2007, 02:23 PM	#3
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	Re: fuel rail? Like Unit says, higher horsepower applications really benefit from the increased fuel flow. However, even moderate HP applications can see an improvement with reduced starvation at the injectors, particularly because of the 6-5 pulse. On the engine dyno, we've seen lower EGT's on #5 with an aftermarket rail because it isn't so affected by #6 firing right in front of it. __________________ Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!"

01-02-2007, 09:16 AM	#4
mudchucker Registered Member Join Date: Mar 2004 Posts: 73	Re: fuel rail? Thanks guys!!!!!

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01-02-2007, 06:15 PM	#5
Coupe50h Registered Member Join Date: Aug 2002 Location: SanAntonio, Tx Posts: 957	Re: fuel rail? Did anyone really help this guy? What year car? mods? There is a factory shcrader valve on the fuel rail on all efi 5.0's to my knowledge, actually it's on the fuel line coming up from the passenger side lower area, and the stock regulator can be replaced with an adjustable one. later __________________ X-Texas highway patrol ssp 1990 coupe - exploder Gt-40 iron heads, Explorer intake, 19 lber's. E-cam. crane 1.7 rollers. 190fp. 75mm maf. 65mm tb, tubular subframe connectors, mac cai, Asp crank pulley, T-5, king cobra clutch, flowtech 1-5/8 unequals, mac X-pipe Frpp driveshaft, lakewood Lca's. race weight 3,160 12.69 @ 107.35, 1.71 60' 26x8.5 drag's 3.90 gear 13.20 @ 106.91 - 235/60/15 firestones 2.3 60' 3.27 gear

01-02-2007, 09:06 PM	#6
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	Re: fuel rail? Good read Coupe.....missed the second part of the question. Correct. Use the schrader valve on the factory rails. You can buy complete gauge kits from Accel, BBK and others. You can also get a temporary fuel pressure test kit from Actron at Sears for about $40 that will have fittings to work with most import and domestic systems. __________________ Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!"