Fuel: Parallel vs. Series
12-06-12, 10:45 AM
#1
Fuel: Parallel vs. Series
I'm getting ready to start building my fuel system and I've bought enough hose and fittings to run either a series OR parallel system.
I'm using bosch ev14 550/2000 with FFE rails.
Aeromotive 340 fuel pump
Aeromotive FPR
Power goals on my ball bearing TD61 with methanol injection will be around 400whp.
I'm just curious to see what others have done and why.
I'm using bosch ev14 550/2000 with FFE rails.
Aeromotive 340 fuel pump
Aeromotive FPR
Power goals on my ball bearing TD61 with methanol injection will be around 400whp.
I'm just curious to see what others have done and why.
12-06-12, 11:06 AM
#2
That turbo will hit 400whp on pump easily. Water injection is always a great mod to have nonetheless. If you are limited to 91 octane, I can see the need.
The idea behind parallel configuration is to distribute equalized pressure across the system. So the primaries dont lower the pressure of the secondaries, they are given their own source. I personally never saw a need for parallel. The root would be large primaries and a barely adequate fuel pump. Pressure drops because the pump can't keep up. I am making 454whp on 720/2000 with the Stealth 340lph and have had zero fuel issues in a series configuration. I plan to hit 500 with the same setup.
In a big power setup, I can see the possibility of needing parallel fuel lines, but for most setups, it just isn't needed. This is my experience.
The idea behind parallel configuration is to distribute equalized pressure across the system. So the primaries dont lower the pressure of the secondaries, they are given their own source. I personally never saw a need for parallel. The root would be large primaries and a barely adequate fuel pump. Pressure drops because the pump can't keep up. I am making 454whp on 720/2000 with the Stealth 340lph and have had zero fuel issues in a series configuration. I plan to hit 500 with the same setup.
In a big power setup, I can see the possibility of needing parallel fuel lines, but for most setups, it just isn't needed. This is my experience.
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Warrior777 (03-31-22)
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Warrior777 (03-31-22)
12-06-12, 11:18 AM
#4
That makes no sense. The injector duty cycle of all 4 injectors comprises the desired AFR. Yes, the secondaries supply more fuel, but only as much as the ECU is tuned for. I would not want to sacrifice any pressure loss to any injector.
To me, its all about adequate pump supply. The Stealth is a beast. It has been proven on 520whp. I would be more hesitant to move to the Walbro 400 before simply running 2 Stealths.
To me, its all about adequate pump supply. The Stealth is a beast. It has been proven on 520whp. I would be more hesitant to move to the Walbro 400 before simply running 2 Stealths.
12-06-12, 11:22 AM
#6
I'm running mine in parallel... So truthfully... is it an absolute necessity with your power goals and set up? ...probly not.. But if you have enough line and fittings to do it. Then I say do it for the sake of having that much better of a system..ya know?
12-08-12, 08:43 PM
#12
My opinion...
I'd run two pumps, in the tank, and 5 no. 6 hardlines to the engine compartment. That gives you a supply and return for each pump and the charcoal line to keep the fumes down. They like the fuel and thats how I build em and have never had a problem. Others will likely say that is overkill, to each their own. I myself do not like two pumps on the same supply line, that is just my opinion. Also, I like two big DENSO's, and have never had a fuel supply issue, assuming injectors and everything else is up to par. I'm sticking with two in tank DENSO's and five no. 6 hardlines, because it works. Spare no expense!
Last edited by KD-93R1; 12-08-12 at 08:48 PM. Reason: Add ons
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Erosangel (07-03-19)
12-08-12, 09:19 PM
#15
I'd think about it...
LSX swap is NEVER an option for mines, not ever!
12-09-12, 12:56 PM
#17
F'n Newbie...
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That said, brand new lines, fittings, and a good filter came out to cost approx $475.
If anybody is interested I can direct them to my build thread on the "other" forum that has everything broken down in an itemized fashion with costs and part numbers from Summit.
Last edited by fendamonky; 12-09-12 at 12:59 PM.
04-23-14, 10:46 PM
#20
Ok, i was actually going to run mine in series, but the new rails are -8an so will have to buy fittings anyway.
The diagram below is how I'm thinking of doing it instead of the traditional y-block in - y-block out arrangement.
I'm using t-blocks on both sides of the primary rail, for aesthetics more than anything and to keep down clutter
Everything connected to the rails is -8AN except the feed and return lines which will be -6AN to conventional 3/8 fuel hose/ bundy.
Any conceivable problems with this before i start ordering fittings? Thanks in advance.
The diagram below is how I'm thinking of doing it instead of the traditional y-block in - y-block out arrangement.
I'm using t-blocks on both sides of the primary rail, for aesthetics more than anything and to keep down clutter
Everything connected to the rails is -8AN except the feed and return lines which will be -6AN to conventional 3/8 fuel hose/ bundy.
Any conceivable problems with this before i start ordering fittings? Thanks in advance.
04-25-14, 07:57 PM
#21
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Why not run the system in parallel?
I made my system parallel and the cost of the fittings and lines were not that much money.
Line was like $2-3/foot. te Y fitting was $13-14/piece, few extra fittings were $20-30.
Cost of the difference was maybe $50 more?
If people want, I can start sourcing parts for people to make a Parallel system and sell it as a kit. I am helping another one local in his system. I can start stocking parts and fuel lines and selling them to people if you want. Obviously I will do this for a small profit but it should still be cheaper than other "systems".
To take it a step further, I can also cut lines to length and install the ends on the lines and will obviously have to charge some for it. I can write install instructions and sell it as a kit. I could even buy a FPR/Gauge etc.
I made my system parallel and the cost of the fittings and lines were not that much money.
Line was like $2-3/foot. te Y fitting was $13-14/piece, few extra fittings were $20-30.
Cost of the difference was maybe $50 more?
If people want, I can start sourcing parts for people to make a Parallel system and sell it as a kit. I am helping another one local in his system. I can start stocking parts and fuel lines and selling them to people if you want. Obviously I will do this for a small profit but it should still be cheaper than other "systems".
To take it a step further, I can also cut lines to length and install the ends on the lines and will obviously have to charge some for it. I can write install instructions and sell it as a kit. I could even buy a FPR/Gauge etc.
04-25-14, 09:31 PM
#22
It still is technically "parallel" , i probably could have labelled the sketch a bit better, with one feed and a return, i just thought it might be a bit neater in yhe engine bay like this. All the lines looping the rails together are -8an because my new rails are -8, so should have plenty of volume, going back down to -6 for the supply and return.
Re the parallel kits, im sure there is a market for it. I for one find listing all the stuff im going to needa fair head-****.
Got any pics of what you have in mind?
Re the parallel kits, im sure there is a market for it. I for one find listing all the stuff im going to needa fair head-****.
Got any pics of what you have in mind?
04-25-14, 10:12 PM
#23
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It still is technically "parallel" , i probably could have labelled the sketch a bit better, with one feed and a return, i just thought it might be a bit neater in yhe engine bay like this. All the lines looping the rails together are -8an because my new rails are -8, so should have plenty of volume, going back down to -6 for the supply and return.
Re the parallel kits, im sure there is a market for it. I for one find listing all the stuff im going to needa fair head-****.
Got any pics of what you have in mind?
Re the parallel kits, im sure there is a market for it. I for one find listing all the stuff im going to needa fair head-****.
Got any pics of what you have in mind?
04-26-14, 01:04 AM
#24
Ok, thanks for that mate. I might just wait till i get my engine back before ordering anything anyway just to make sure it will actually fit neatly. who knows, i might end up justgoing with the conventional y-block and twin return to both reg ports.
04-27-14, 04:05 PM
#25
F**K THE SYSTEM!!
I have mine wired in series. Could this be the reason my afrs lean a bit when my secondaries kick in? I can see in the log, when duty cycles drops(secondaries kick on) it spikes a couple of tenths of AFRs. I run 40psi base fuel pressure with ID1000pri and ID2000sec injectors fed by Aeromotive stealth pump. I've been wanting to sort that out, as im not sure if it is a tuning issue or not. I cannot currently log fuel press. im working on it.