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Old 10-31-2013, 04:57 PM   #51
Flat 4 Motorsport
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Quote:
Originally Posted by Maxwell Power View Post

No. It does not. Parallel would be appropriate, but every step should be taken to maximize flow though the rails evenly and quickly to help control temperature.
This is why I run them in series, less lines to heat up, and the injectors are not all open at the same time.

I feed after a pre filter cyl 3-1 first crossover to 2-4 then to fpr and return back to the tank.

Key here like Dom said is keeping fuel temps down and pressure consistent.


-Phil
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Old 10-31-2013, 04:59 PM   #52
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Originally Posted by Flat 4 Motorsport View Post
This is why I run them in series, less lines to heat up, and the injectors are not all open at the same time.

I feed after a pre filter cyl 3-1 first crossover to 2-4 then to fpr and return back to the tank.

Key here like Dom said is keeping fuel temps down and pressure consistent.


-Phil
We're talking about a 6 cylinder. For a 4 cylinder it should be 4-2-3-1
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Old 10-31-2013, 05:01 PM   #53
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Originally Posted by Maxwell Power View Post

We're talking about a 6 cylinder. For a 4 cylinder it should be 4-2-3-1
Feed that number 4 cylinder first!!!!! What Dom said
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Old 10-31-2013, 05:13 PM   #54
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How do you feel about fuel dampers, specifically on a car with upgraded lines? Do you recommend still using them, and have you noticed a difference with or without dampers in the system? Iv heard that more total volume of fuel in the system from bigger lines will smooth out the pulses and dampen the flow good enough, but not sure how true this is or at what point it would become unnecessary to use them. Appreciate your posts and information
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Old 10-31-2013, 05:17 PM   #55
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How do you feel about fuel dampers, specifically on a car with upgraded lines? Do you recommend still using them, and have you noticed a difference with or without dampers in the system? Iv heard that more total volume of fuel in the system from bigger lines will smooth out the pulses and dampen the flow good enough, but not sure how true this is or at what point it would become unnecessary to use them. Appreciate your posts and information
I'm having my fuel rails and lines done Monday. Aeromotive stated and I quote "dampers are bandaides and you don't one". This was from the head tech over at aeromotive. Now I'm not agreeing or disagreeing because I haven't heard much about dampers w fuel rail upgrades. Now I know two nasioc guys running the marren w there rails. Dom what say you on the marren damper?
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Old 10-31-2013, 06:00 PM   #56
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I'm having my fuel rails and lines done Monday. Aeromotive stated and I quote "dampers are bandaides and you don't one". This was from the head tech over at aeromotive. Now I'm not agreeing or disagreeing because I haven't heard much about dampers w fuel rail upgrades. Now I know two nasioc guys running the marren w there rails. Dom what say you on the marren damper?
The factory dampers main purpose is limiting noise in the cabin. Without dampers you will experience louder tapping noises throughout the car due to the quantity of hard lines.
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Old 10-31-2013, 06:42 PM   #57
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Originally Posted by Maxwell Power View Post

The factory dampers main purpose is limiting noise in the cabin. Without dampers you will experience louder tapping noises throughout the car due to the quantity of hard lines.
So you recommend the marren w an aeromotive rail/line upgrade??
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Old 10-31-2013, 06:59 PM   #58
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So you recommend the marren w an aeromotive rail/line upgrade??
It sounds like dampers are more for your comfort than anything.
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Old 10-31-2013, 07:19 PM   #59
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It sounds like dampers are more for your comfort than anything.
Yea it makes aense
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Old 10-31-2013, 09:41 PM   #60
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Quote:
Originally Posted by Maxwell Power View Post
We're talking about a 6 cylinder. For a 4 cylinder it should be 4-2-3-1
My sequence is 4-2-1-3.
Fuel: E100
Fuel Rails: Aeromotive 8AN

Can it be harmful?
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Old 11-01-2013, 03:49 AM   #61
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Hi Guys,

I've been searching about series vs parallel set up for a while, and i gotta tell U Guys IM CONFUSED. I remember couple of nasioc members reporting that parallel set up looks better on paper then series. For me it make a sense but after reading Maxwell posts it doesn't anymore. So please explain why Prodrive has used parallel fuel lines in their WRC Subarus ?? Wouldn't that suggest the paraller is more efficient?? I've a aeromotive fuel lines already and Im about to buy all necessary fittings and hoses to put this fuel system together so please steer me in right direction ( parallel = more spend $$$$$$, series = less $$$$ ) before i ll throw my money on something that I don't need.

Thanks

Last edited by Ukashi82; 11-01-2013 at 04:52 AM.
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Old 11-01-2013, 09:08 AM   #62
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Originally Posted by Ukashi82 View Post
Hi Guys,

I've been searching about series vs parallel set up for a while, and i gotta tell U Guys IM CONFUSED. I remember couple of nasioc members reporting that parallel set up looks better on paper then series. For me it make a sense but after reading Maxwell posts it doesn't anymore. So please explain why Prodrive has used parallel fuel lines in their WRC Subarus ?? Wouldn't that suggest the paraller is more efficient?? I've a aeromotive fuel lines already and Im about to buy all necessary fittings and hoses to put this fuel system together so please steer me in right direction ( parallel = more spend $$$$$$, series = less $$$$ ) before i ll throw my money on something that I don't need.

Thanks
From what I have read from maxwell power series when done properly is better. This is because it keeps fuel temps down and more consistent over all four cylinders. At least that's what I gleaned from the reading. Someone chime in if I read wrong but I'm pretty sure that's what they were getting at.
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Old 11-01-2013, 11:12 AM   #63
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Originally Posted by Ukashi82 View Post
Hi Guys,

I've been searching about series vs parallel set up for a while, and i gotta tell U Guys IM CONFUSED. I remember couple of nasioc members reporting that parallel set up looks better on paper then series. For me it make a sense but after reading Maxwell posts it doesn't anymore. So please explain why Prodrive has used parallel fuel lines in their WRC Subarus ?? Wouldn't that suggest the paraller is more efficient?? I've a aeromotive fuel lines already and Im about to buy all necessary fittings and hoses to put this fuel system together so please steer me in right direction ( parallel = more spend $$$$$$, series = less $$$$ ) before i ll throw my money on something that I don't need.

Thanks
Pretty sure by this point everyone has had their say in the matter. At this point it's up to you too choose which route you take.
In the end, with all the science aside, it seems to me that you should pick the way that has the least amount of reported problems: serial.

I mean people have all these "theories" that they use to justify going parallel, but the only real documented problems anyone has is with parallel. I mean, heck, the first time subaru went parallel, misfire issues for days. Ask any 08 STi guy.

In the end, the choice is yours.

Last edited by Maxwell Power; 01-03-2014 at 01:52 AM.
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Old 11-01-2013, 01:09 PM   #64
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Maxwell if i decide to keep it in series, what is your recommendation on fuel line size between rails ?? Im thinkin about -6AN from hard fuel line to the fuel rail then -8AN between rails and then -6AN from rail on pass side going to FPR. And -6AN going back from FPR to return hard line. Or keep it simple and do -6AN all around ?? BTW do I need to zero out fuel compensation tables ( Im going to run modified dark blue WRX injectors ) with this setup ??
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Old 11-01-2013, 01:54 PM   #65
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that makes no sense at all.

if your supply is -6, then the whole thing should be -6 or smaller. If your supply is -8, then -6 or -8.
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Old 11-01-2013, 03:04 PM   #66
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that makes no sense at all.

if your supply is -6, then the whole thing should be -6 or smaller. If your supply is -8, then -6 or -8.
Thanks a lot
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Old 11-01-2013, 03:08 PM   #67
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What about compensation tables ??? Should I zeroed them out ???
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Old 11-01-2013, 04:01 PM   #68
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You guys seen this yet?
http://www.rhdjapan.com/sard-jet-pum...preza-gdb.html

Seems like the stock jet pump is VERY small and would be a huge restriction on the return line, I have my hanger assembly apart now looking at it, almost seems like it wouldnt matter how big or small of a return line you used as the stock jet pump would still be the restriction by far, I bet you could run a big pump like the walbro 460 and not overrun the stock FPR if you had one of these sard jet pumps.

I know alot of evo guys also drill out the siphon orfice after upgrading the fuel pump to get their base fuel pressure back in check, but a properly designed jet pump thats made for a bigger fuel pumps flow seems like it would be a better option.
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Old 11-01-2013, 05:04 PM   #69
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Quote:
Originally Posted by NA STI View Post
You guys seen this yet?
http://www.rhdjapan.com/sard-jet-pum...preza-gdb.html

Seems like the stock jet pump is VERY small and would be a huge restriction on the return line, I have my hanger assembly apart now looking at it, almost seems like it wouldnt matter how big or small of a return line you used as the stock jet pump would still be the restriction by far, I bet you could run a big pump like the walbro 460 and not overrun the stock FPR if you had one of these sard jet pumps.

I know alot of evo guys also drill out the siphon orfice after upgrading the fuel pump to get their base fuel pressure back in check, but a properly designed jet pump thats made for a bigger fuel pumps flow seems like it would be a better option.
Looks like it only fits JDM imprezas...
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Old 11-02-2013, 06:44 AM   #70
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It should fit all imprezas. They all use the same jet pump.

I'm actually a bit upset inside that I didn't even think about the jet pump.. I missed something obvious.
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Old 11-02-2013, 03:36 PM   #71
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It should fit all imprezas. They all use the same jet pump.

I'm actually a bit upset inside that I didn't even think about the jet pump.. I missed something obvious.
Yeah I noticed none of the subie guys ever messed with the stock jet pump, I didnt understand this at all, as its one of the first things the evo guys tinker with after upgrading the fuel pump to get the base pressure back to how it should be.

I think most of the subie guys just simply dont care if the fpr is getting overrun or running unstable after throwing in a big pump, and just tune around it to try and cover it up. Also it makes trying to do a bulkhead fitting on the hanger a pain, trying to adapt the return bulkhead fitting back to that stock jet pump somehow. I think im going to order one of these SARD jet pumps and get my fuel hanger setup legit, with 6an bulkheads on the return and feed and also modify the STi plastic fuel box by installing a slightly bigger fitting on it to match the size of the sard jet pump outlet, as id like to keep that stock STi "surge" box in the system with the return running right back in it like it should be so your less likely to get a fuel cut when running low on gas.

Ill be sure to post up nice pics and a mini review
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Old 11-02-2013, 05:29 PM   #72
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Originally Posted by Never Summer View Post

Feed that number 4 cylinder first!!!!! What Dom said
The injector ia still getting fuel?

Its the firat one to open that line should always have base pressure. I run my fuel lines the saem way all the time.

Doesn't matter. I guess if all the injectors opened at the same time it would make a difference.

The goal is not a lot of line to heat up.

The rails constantly have pressure.
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Old 11-02-2013, 05:51 PM   #73
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Originally Posted by Maxwell Power View Post

We're talking about a 6 cylinder. For a 4 cylinder it should be 4-2-3-1
Okay i didn't read through the entire thread but isn't the firing order 1-3-2-4

-Phil
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Old 11-02-2013, 06:26 PM   #74
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Okay i didn't read through the entire thread but isn't the firing order 1-3-2-4

-Phil
Yea. 1-3-2-4 is correct.
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Old 11-02-2013, 06:49 PM   #75
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Yea. 1-3-2-4 is correct.
So wouldnt it make more sense if the fuel rail feeding 1-3 gets fuel first?

4 is getting fuel last regardless.

So length of lines and fuel temps are the most important things to think about when doing lines/rails.

Ive thought about all of this stuff extensively. This is how I have designed my rails/line setups.

Im working on some reflective film ideas for the lines.

polyamide mylar is cool stuff.

-Phil
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