LS1 In An FFR Roadster
^^ I dont understand by that last pic above there how you are planning to regulate the fuel pressure??
Have the pump feed the rail(s) directly, then FROM the rails into the regulator...the bottom port on that Aeromotive regulator is the return part which goes back into the tank....
Have the pump feed the rail(s) directly, then FROM the rails into the regulator...the bottom port on that Aeromotive regulator is the return part which goes back into the tank....
^^ Yes the bottom port on the FPR will be the return line going back to the tank. Looking directly at the FPR in the last pic the line going into the left side is the feed from the tank, the line going out the rightside of the FPR is feeding the rails. I still have to cap one side of the rails so fuel doesn't spew out all over the place.. 
Tails
Tails
^^ Yes the bottom port on the FPR will be the return line going back to the tank. Looking directly at the FPR in the last pic the line going into the left side is the feed from the tank, the line going out the rightside of the FPR is feeding the rails. I still have to cap one side of the rails so fuel doesn't spew out all over the place..
Tails
Tails
Very Nice build up by the way!!
When I was putting the system together I was told to route the fuel that way. Why the other way? Or will I run into issues doing it like this?
Thanks for noticing BTW...
Tails
Thanks for noticing BTW...
Tails
I think it would be better if you fed the rails directly from the tank, and the regulator after the rails are fed, instead of regulating the fuel before they go into the rails....<---Going by what you said above ^^ it looks like you are going to regulate the fuel before they go into the rails??
I would rather have all my fuel stuff out back
They I mentioned, really is the proper way to do it in a Fuel Injected Application! will keep the rails pressurized and filled (volume) at the set PSI at all times at all RPMs (as long as the pump keeps up, ie. no voltage drop and pumps less volume)...and the injectors will fire out the fuel as needed as the RPMs rise....
If you regulate the fuel pressure before the rails: bascially you are just regulating line pressure and NOT Rail pressure which is really needed in an EFI app. Also, When the fuel injectors open, they will drain the rails before the regulator allows more fuel to fill up the rails...you WILL run out of fuel in an instant! The car wont run well if at all!
Now if it was a carburated application, then the way Tails already had it setup, regulating the fuel pressure before it goes into the carb, is the "proper" way...
Just my cpl cents on the matter.
If you regulate the fuel pressure before the rails: bascially you are just regulating line pressure and NOT Rail pressure which is really needed in an EFI app. Also, When the fuel injectors open, they will drain the rails before the regulator allows more fuel to fill up the rails...you WILL run out of fuel in an instant! The car wont run well if at all!
Now if it was a carburated application, then the way Tails already had it setup, regulating the fuel pressure before it goes into the carb, is the "proper" way...
Just my cpl cents on the matter.
Last edited by magic; Sep 9, 2008 at 09:08 PM.
They I mentioned, really is the proper way to do it in a Fuel Injected Application! will keep the rails pressurized and filled (volume) at the set PSI at all times at all RPMs (as long as the pump keeps up, ie. no voltage drop and pumps less volume)...and the injectors will fire out the fuel as needed as the RPMs rise....
If you regulate the fuel pressure before the rails: bascially you are just regulating line pressure and NOT Rail pressure which is really needed in an EFI app. Also, When the fuel injectors open, they will drain the rails before the regulator allows more fuel to fill up the rails...and in doing so especially at WOT, you WILL run out of fuel in an instant = CATASTROPHE!
Now if it was a carburated application, then the way Tails already had it setup, regulating the fuel pressure before it goes into the carb, is the "proper" way...
Just my cpl cents on the matter.
If you regulate the fuel pressure before the rails: bascially you are just regulating line pressure and NOT Rail pressure which is really needed in an EFI app. Also, When the fuel injectors open, they will drain the rails before the regulator allows more fuel to fill up the rails...and in doing so especially at WOT, you WILL run out of fuel in an instant = CATASTROPHE!
Now if it was a carburated application, then the way Tails already had it setup, regulating the fuel pressure before it goes into the carb, is the "proper" way...
Just my cpl cents on the matter.
well ****.. I wonder if my fuel setup is correct then I have stock rails/stock FPR with a corvette filter and return.. although the return is before the fuel rail (in the back of the car).
Return and Returnless....Im going to assume you already know about these two types? But Im just going to re-iterate it and going to explain it the way it was explained to me....
The Return is what it is...has a return line, with a fuel pressure regulator regulating the fuel pressure (a set pressure at all rpms), and the excess is returned back into the tank....because the pump, pumps out a specific amount based on time at all rpms... (litres per hour, gallons per hour)
The returnless, is just that...has no return line....there is a fuel rail pressure sensor (on the fuel rail) that does as it says... senses fuel rail pressure, along in conjuction with rpm...if the rpm rises, the fuel rail pressure sensor, tells the computer to tell the fuel pump to pump more flow....so basically this system sends fuel to the rail as its required....
What your system has, is a returnless I believe, on the Corvettes...Im more familiar with the Mustangs, but just about any EFI system is all inter-related somehow.
However, Im curious to learn exactly how this setup works on the Vettes?? Its almost like its an inbetween of those two types of fuel systems?
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Verdad Gallardo See now, I should have mentioned the two different types of fuel system setups....
Return and Returnless....Im going to assume you already know about these two types? But Im just going to re-iterate it and going to explain it the way it was explained to me....
The Return is what it is...has a return line, with a fuel pressure regulator regulating the fuel pressure (a set pressure at all rpms), and the excess is returned back into the tank....because the pump, pumps out a specific amount based on time at all rpms... (litres per hour, gallons per hour)
The returnless, is just that...has no return line....there is a fuel rail pressure sensor (on the fuel rail) that does as it says... senses fuel rail pressure, along in conjuction with rpm...if the rpm rises, the fuel rail pressure sensor, tells the computer to tell the fuel pump to pump more flow....so basically this system sends fuel to the rail as its required....
What your system has, is a returnless I believe, on the Corvettes...Im more familiar with the Mustangs, but just about any EFI system is all inter-related somehow.
However, Im curious to learn exactly how this setup works on the Vettes?? Its almost like its an inbetween of those two types of fuel systems?
Return and Returnless....Im going to assume you already know about these two types? But Im just going to re-iterate it and going to explain it the way it was explained to me....
The Return is what it is...has a return line, with a fuel pressure regulator regulating the fuel pressure (a set pressure at all rpms), and the excess is returned back into the tank....because the pump, pumps out a specific amount based on time at all rpms... (litres per hour, gallons per hour)
The returnless, is just that...has no return line....there is a fuel rail pressure sensor (on the fuel rail) that does as it says... senses fuel rail pressure, along in conjuction with rpm...if the rpm rises, the fuel rail pressure sensor, tells the computer to tell the fuel pump to pump more flow....so basically this system sends fuel to the rail as its required....
What your system has, is a returnless I believe, on the Corvettes...Im more familiar with the Mustangs, but just about any EFI system is all inter-related somehow.
However, Im curious to learn exactly how this setup works on the Vettes?? Its almost like its an inbetween of those two types of fuel systems?
The way it was explained to me was with the external walbro I will probably run into and over pressure issue if I ran it directly to the rails with the FPR after. This way it keeps the pressure under control coming from the pump into the rails.
Interesting discussion non the less.. I might change it up just to see what happens..
Tails
Interesting discussion non the less..
I might change it up just to see what happens.. Tails
Here's some pics from last weekend. Decided to do a trial fit of the body so I could see what I'm going to need to move. Looks like all I gotta do is move the brake/clutch fluid reservoirs down or out a little. Like I said rough fit to see what I got to work with. Enjoy...
Tails
Tails
Damn been almost a month since an update. Nothing major going on right now. Working on lots of little stuff, not really post worthy. Got the radiator, fan, and shroud done this past weekend. Will work on getting the side pipes mounted and the body back on again to check alignment. It's to the point now that all the mojor stuff is installed. Just have all the little nit picky stuff to take care of so don't worry I haven't stopped. Here's some pics..
Tails
Tails
Started the wiring this past weekend. Got the engine harness and the chassis harness routed and layed out. We'll see how much I get done next weekend with it being Thanksgiving and all. Either way gotta start on the gauges, fuel pump, relays, etc... Sorry about the lack of updates just not as many major things done now. It's more little stuff, not really pic worthy. However still moving ahead as much as I can. Next major goal is to get this thing fired up. Getting close..
Tails
Tails
Did you think of trying the 5.0 headers that most people use. Basically you can just hack off the flange from the 5.0 header round out the primaries and weld the Ls1 flange right onto it. Its really easy.
The external dimensions of the ls1 and the 5.0 should be similar but I'm not sure.
The external dimensions of the ls1 and the 5.0 should be similar but I'm not sure.