Non Return line vs Return line system?
03-01-2008, 05:03 PM
#1
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Non Return line vs Return line system? I am currently running a return style system with my Ls1 in my 87 Trans Am. I have to run new fuel line and a friend said I could eliminate the return line. I know I can do this because I am using a 99 fuel rail with an Aeromotive regulator.
Now, a friend of mine also told me that a return style system will be better for a high horsepower system. If this is true, at what horsepower levels does this come into play?
I know there are people running 408s with the stock return less lines in their f bodies.
What do you guys think?
Now, a friend of mine also told me that a return style system will be better for a high horsepower system. If this is true, at what horsepower levels does this come into play?
I know there are people running 408s with the stock return less lines in their f bodies.
What do you guys think?
03-01-2008, 06:04 PM
#2
I'm thinking there is a bit of confusion going on here. The '98+ F-bodies and Vettes all use a return style system, but the returns are in the back of the car, not from the rails, and the regulator is in the tank. Unless you can run a regulator in the tank, you'll still need a return line after your regulator to bleed off the excess fuel.
As for the higher HP application...not sure where that starts. I'm in the process of converting my current 2002 F-body system to a return at the rails style system on my stock internal engine to see if I can keep the fuel pressure from dropping so much at WOT.
As for the higher HP application...not sure where that starts. I'm in the process of converting my current 2002 F-body system to a return at the rails style system on my stock internal engine to see if I can keep the fuel pressure from dropping so much at WOT.
03-01-2008, 08:13 PM
#3
I typically see a substantial drop in pressure on the non-return styles at approx 700hp. For a boosted application it is more important as you can also boost reference the pressure.
Under this amount it is a matter of preference, but running a return from the rail with a front mount regulator is always the best way. You need to control the pressure where it matters... at the engine, not the tank.
Under this amount it is a matter of preference, but running a return from the rail with a front mount regulator is always the best way. You need to control the pressure where it matters... at the engine, not the tank.
03-03-2008, 04:19 PM
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I typically see a substantial drop in pressure on the non-return styles at approx 700hp. For a boosted application it is more important as you can also boost reference the pressure.
Under this amount it is a matter of preference, but running a return from the rail with a front mount regulator is always the best way. You need to control the pressure where it matters... at the engine, not the tank.
Under this amount it is a matter of preference, but running a return from the rail with a front mount regulator is always the best way. You need to control the pressure where it matters... at the engine, not the tank.
03-03-2008, 05:27 PM
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I have the stock rail on my 2002 Camaro and with cam and headers I made 400 hp to the tire with no problem but now that I added a blower I am now losing fuel pressure @ 5200 or so running the stock pump with a BAP. I know a guy that had the same problem and he installed a 255 pump and went to the return style rail leaving the reg in the tank and it cured the problem so that is what I'm going to do also.
03-03-2008, 05:31 PM
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I have the stock rail on my 2002 Camaro and with cam and headers I made 400 hp to the tire with no problem but now that I added a blower I am now losing fuel pressure @ 5200 or so running the stock pump with a BAP. I know a guy that had the same problem and he installed a 255 pump and went to the return style rail leaving the reg in the tank and it cured the problem so that is what I'm going to do also.
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03-03-2008, 06:16 PM
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I have the stock rail on my 2002 Camaro and with cam and headers I made 400 hp to the tire with no problem but now that I added a blower I am now losing fuel pressure @ 5200 or so running the stock pump with a BAP. I know a guy that had the same problem and he installed a 255 pump and went to the return style rail leaving the reg in the tank and it cured the problem so that is what I'm going to do also.
