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tiddies
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Joined: Feb 11, 2009
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 Posted: Mon Oct 31, 2011 10:38 pm Post subject: scott, fuel info for you |
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hey man i was doing some reading on return fuel setups and ran across this thread on S197. the guy is saying that in a pre-rail regulated setup the fuel will not be getting hot because the unused fuel was not passing through the rails.
"Then do a pre-rail regulator setup.
How:
- Come with the one hose from the filter to one side of the regulator.
- Install the return line normally.
- Connect the other side of the regulator to the passenger rail.
- Install a normal crossover hose between rails.
- Cap the other end of the driver's rail.
Why:
- This way you do not heat fuel that returns to the tank (if you do post rail it heats, a lot, believe me)
- Having the FRPS in place with the proper injector data your PCM will compensate any pressure variations (that are really tiny, I can send you a fuel pressure log thru a dyno run for you to check)"
http://s197forum.com/forum/showthread.php?t=40339 |
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tiddies
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| Posted: Tue Nov 01, 2011 7:24 am Post subject: |
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Also as an add on you will need to be able to your your FPRS so it can sense changes in flow/volume
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Mystichrome
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Joined: Mar 30, 2011
Posts: 1399
Location: Jacksonville
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| Posted: Tue Nov 01, 2011 8:57 am Post subject: |
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| Thats a unique way of doing it.... But I deleted my FPRS completely.... Is this all done for keeping the fuel cool? That's the only benefit I see. |
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tiddies
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| Posted: Tue Nov 01, 2011 9:50 am Post subject: |
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yes, it eliminates the fuel haveing to go through the rails and getting heat soaked.
in all reality you wouldnt need the FPRS because the would be little to no changes in the flow but it there for peace of mind.
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Mystichrome
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Joined: Mar 30, 2011
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| Posted: Tue Nov 01, 2011 10:05 am Post subject: |
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| On cobras it's there to get blow off by pressure spikes. It's worthless in a return setup, because you don't use it to tune anymore. The are no more fuel tables to set. |
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SpeedJunky
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Joined: Jan 17, 2009
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| Posted: Tue Nov 01, 2011 11:14 am Post subject: |
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| Appreciate the info man, but I'd have to completely re-do my fuel system after the post filter and get a new regulator. I'll look into when I change the lines from stainless to fiber braided. |
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tiddies
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| Posted: Tue Nov 01, 2011 11:52 am Post subject: |
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| Mystichrome wrote: | | On cobras it's there to get blow off by pressure spikes. It's worthless in a return setup, because you don't use it to tune anymore. The are no more fuel tables to set. |
I'd like to hear Jeff's input on this setup as I don't feel like bumping an old thread on that forum. |
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Mystichrome
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| Posted: Tue Nov 01, 2011 1:54 pm Post subject: |
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| Okay bud... I don't know what I'm talking about. It's not like I am already running a full return fuel system... It's cool...LOL. |
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tiddies
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| Posted: Tue Nov 01, 2011 4:24 pm Post subject: |
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i think if you were running a FPDM and FPRS then the computer will be able to make small changes in the voltage that the pump gets.
thats why i want to hear from jeff
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Mystichrome
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| Posted: Tue Nov 01, 2011 4:49 pm Post subject: |
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| The pumps run full time in a return setup. No voltage changes at all. |
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Joey
Smokin' Tires
Joined: Jan 14, 2009
Posts: 4149
Location: J-actionville, North Cackallacky
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| Posted: Tue Nov 01, 2011 5:03 pm Post subject: |
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^ yep, the joys of the return system
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SpeedJunky
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| Posted: Tue Nov 01, 2011 5:07 pm Post subject: |
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| Mystichrome wrote: | | The pumps run full time in a return setup. No voltage changes at all. |
Unless you have a pump controller, but you wouldn't use an FPDM. My controller ran off of RPMs. |
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stang910
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Joined: Nov 02, 2008
Posts: 3066
Location: Jacksonville
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| Posted: Tue Nov 01, 2011 5:34 pm Post subject: |
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| I'm a bit confused on this. A regulator has an inlet side and a return side correct and some have more then 1 inlet right? Are there regulators that have inlet, outlet, and return sides? Sorry don't know much about aftermarket return systems. |
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SpeedJunky
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| Posted: Tue Nov 01, 2011 5:41 pm Post subject: |
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| Most regulators have one inlet from the pump, one outlet to the rails and bleed off for return. Mine has two inlets to be used after both rails and a bleed off to the tank. |
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stang910
Smokin' Tires
Joined: Nov 02, 2008
Posts: 3066
Location: Jacksonville
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| Posted: Tue Nov 01, 2011 5:44 pm Post subject: |
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Here's a question. If you keep the FRPS and the FPDM for the purpose of controlling the fuel pumps why would you go through the trouble of running a return line. If you populate the fuel voltage tables properly there's no reason for extra fuel to be in the fuel rails in the first place so why would you need the return line?
I understand going return style to run a big pump/pumps, but I don't see a single FPDM controlling it when a single FPDM has trouble overheating when controlling 2 FGT pumps. |
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