Fuel Rails

04 Mach1 · 05-26-2008, 05:53 PM

So what's the HP limit with stock fox body fuel rails.

qkjuicedpony · 05-26-2008, 06:05 PM

We made 700rwhp with stock fuel rails...but we did have aftermarket braided supply and return lines

04 Mach1 · 05-26-2008, 06:31 PM

Quote:

Originally Posted by qkjuicedpony

We made 700rwhp with stock fuel rails...but we did have aftermarket braided supply and return lines

Was this a stick car??? How much spray?????

I think I might be maxing them out. C4 car with a vortech and 50lbs injectors. Car pulls hard to about 6400 then starts cutting out (acts like a rev limiter)wideband shows lean. I have a 255 forced induction with a 310 external and a KB boost-a-pump -6an feed and a -4an return. I have taken back to the tuner had the chip reflashed rev moved to 10,000rpms. Last week swap out valve springs thinking valve float. Fuel preasure holds steady. Any Ideas??????????

EHardy1971 · 05-26-2008, 07:33 PM

So you're still having the same problem?

qkjuicedpony · 05-26-2008, 08:01 PM

This car was a Glide with two kits.One on 150 one on 100. with 42# Injectors.

You really need a -8 feed and a -6 return on your car

qkjuicedpony · 05-26-2008, 08:02 PM

I had a car do the same thing once.

It had 2 BAD Injectors.

Did you buy those injectors new?

Have you had them checked or flowed lately

coupe · 05-26-2008, 08:37 PM

I was thinking bigger feed too. Pressure is only part of the story....flow is the other.

04 Mach1 · 05-26-2008, 08:43 PM

This is the second set of new injectors in the last year. Was thinking I'm running out of volumn. I have heard of several 650hp + but they were on spary with either a seprate fuel system or tapped into the fuel line meaning the fuel rail did not what supply "all the power" I"m sure both of those kits had their own fuel supply. Is there anywhere near that flow test them? That would make sense having a bad injector.

qkjuicedpony · 05-26-2008, 08:55 PM

1TONY1 on SCF does them.He is in Ringgold Ga and has a pretty quick turn around time.

qkjuicedpony · 05-26-2008, 08:56 PM

Quote:

Originally Posted by coupe

I was thinking bigger feed too. Pressure is only part of the story....flow is the other.

Correct.

Not only that but you have a tiny return with that -4.

If it was me I would swap it to a -10 feed and a -6 return.

05-26-2008, 05:53 PM	#1
04 Mach1 Bet I red light B4U Join Date: Aug 2005 Location: ANNISTON, AL Posts: 975	Fuel Rails So what's the HP limit with stock fox body fuel rails. __________________ 89 gt 2.3 stroked holley head with n12n port high flow intake with great big fart can skunk 2 seat belts with kool glow water squirters and new light up shift knob basically everything from wal-mart art carr C4 10.53@127.3 w/ 1.53 60' 89 gt vert 347 eldebrock heads and intake AOD w/3000 stall unknown with 5spd went 12.7 on steet tires 04 Mach1 automatic flowmaster K+N drop in 13.9

05-26-2008, 06:05 PM	#2
qkjuicedpony Dayuuuuuuum!!!!! Join Date: Dec 2004 Location: Dallas GA Posts: 2,933	We made 700rwhp with stock fuel rails...but we did have aftermarket braided supply and return lines __________________ 86 Mustang Gt......Mods piling up in my garage. 07 F350 dooly.....Tows my fifth wheel

05-26-2008, 07:33 PM	#4
EHardy1971 Trunk Monkey Join Date: Jun 2007 Location: Home Posts: 5,708	So you're still having the same problem? __________________ Eric 89 LX Coupe-Juiced 01 Lightning-Boost 06 TBSS

05-26-2008, 08:01 PM	#5
qkjuicedpony Dayuuuuuuum!!!!! Join Date: Dec 2004 Location: Dallas GA Posts: 2,933	This car was a Glide with two kits.One on 150 one on 100. with 42# Injectors. You really need a -8 feed and a -6 return on your car __________________ 86 Mustang Gt......Mods piling up in my garage. 07 F350 dooly.....Tows my fifth wheel

05-26-2008, 08:02 PM	#6
qkjuicedpony Dayuuuuuuum!!!!! Join Date: Dec 2004 Location: Dallas GA Posts: 2,933	I had a car do the same thing once. It had 2 BAD Injectors. Did you buy those injectors new? Have you had them checked or flowed lately __________________ 86 Mustang Gt......Mods piling up in my garage. 07 F350 dooly.....Tows my fifth wheel

05-26-2008, 08:37 PM	#7
coupe Super Moderator Join Date: Dec 2004 Posts: 6,313	I was thinking bigger feed too. Pressure is only part of the story....flow is the other. __________________ " If you can't explain it simply, you don't understand it well enough. " - Albert Einstein

05-26-2008, 08:43 PM	#8
04 Mach1 Bet I red light B4U Join Date: Aug 2005 Location: ANNISTON, AL Posts: 975	This is the second set of new injectors in the last year. Was thinking I'm running out of volumn. I have heard of several 650hp + but they were on spary with either a seprate fuel system or tapped into the fuel line meaning the fuel rail did not what supply "all the power" I"m sure both of those kits had their own fuel supply. Is there anywhere near that flow test them? That would make sense having a bad injector. __________________ 89 gt 2.3 stroked holley head with n12n port high flow intake with great big fart can skunk 2 seat belts with kool glow water squirters and new light up shift knob basically everything from wal-mart art carr C4 10.53@127.3 w/ 1.53 60' 89 gt vert 347 eldebrock heads and intake AOD w/3000 stall unknown with 5spd went 12.7 on steet tires 04 Mach1 automatic flowmaster K+N drop in 13.9

05-26-2008, 08:55 PM	#9
qkjuicedpony Dayuuuuuuum!!!!! Join Date: Dec 2004 Location: Dallas GA Posts: 2,933	1TONY1 on SCF does them.He is in Ringgold Ga and has a pretty quick turn around time. __________________ 86 Mustang Gt......Mods piling up in my garage. 07 F350 dooly.....Tows my fifth wheel