Fuel line diameter for 500+ hp?
#1
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Fuel line diameter for 500+ hp?
Hey,
i'm just about to upgrade my fuel system, my actual setup is:
T04Z turbo (plan to upgrade to Garrett GTX or BorWarner EFR next season)
big street ported engine (oil passage mods, weightened rotors)
V-Mount, upgraded cooling system, 3" DP and exhaust system and so on...
Last point on my list was the fuel system, i already have
- NipponDenso supra pump (planning to upgrade to Bosch 044 or FueLab 41402)
- 4x 850cc injectors,
i bought 2x 1000cc and 2x 2200 EV14 bosch injectors and SARD fuel rail, i'm not sure if i should go with AN6 feed and return lines or AN8 would be better. I also read some members hit hp numbers over 500 with OEM fuel hard lines, so i guess AN8 would be too much...
What do you guys choose....?
In any case i would go with black nylon braided fuel lines, do you have any ideas for a great deal on these...?
i'm just about to upgrade my fuel system, my actual setup is:
T04Z turbo (plan to upgrade to Garrett GTX or BorWarner EFR next season)
big street ported engine (oil passage mods, weightened rotors)
V-Mount, upgraded cooling system, 3" DP and exhaust system and so on...
Last point on my list was the fuel system, i already have
- NipponDenso supra pump (planning to upgrade to Bosch 044 or FueLab 41402)
- 4x 850cc injectors,
i bought 2x 1000cc and 2x 2200 EV14 bosch injectors and SARD fuel rail, i'm not sure if i should go with AN6 feed and return lines or AN8 would be better. I also read some members hit hp numbers over 500 with OEM fuel hard lines, so i guess AN8 would be too much...
What do you guys choose....?
In any case i would go with black nylon braided fuel lines, do you have any ideas for a great deal on these...?
#3
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...i think it wouldn't be smart to upgrade the rubber lines as the flow would be limited because of the small diameter of the hard lines - but correct me if i'm wrong...?
#5
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Stock lines are 8mm(5/16") and will become the limiting factor. Yes you may be able to reach your goal, but you'll be pushing it to the limit.
Really you should upgrade, and if your going to do so why pick the smaller -6 size, if you're already investing in the parts, what's the difference in going to -8?
Really you should upgrade, and if your going to do so why pick the smaller -6 size, if you're already investing in the parts, what's the difference in going to -8?
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#8
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Stock lines are 8mm(5/16") an will become the limiting factor. Yes you may be able to reach your goal, but you'll be pushing it to the limit.
Really you should upgrade, and if your going to do so why pick the smaller -6 size, if you're already investing in the parts, what's the difference in going to -8?
Really you should upgrade, and if your going to do so why pick the smaller -6 size, if you're already investing in the parts, what's the difference in going to -8?
#10
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Look at the upper right hand chart. Note this is for water and 25' length of hose.
A 5/16 hard line is approximately .235 ID. Lets use 1/4" as the OEM return line.
If you use 1 GPM as the flow rate, then the 1/4" ID line is producing an estimated 15 PSI back pressure. (9.0 PSI @.8 GPM).
The pump is capable of providing this pressure to compensate for hose friction but your are at the flow limit for 1/4" hard line and loading the pump.
Same flow with a 3/8" ID hose is 1.8 PSI. The pump likes some loading so no need to operate it at no load.
Factor in your hose length, fittings and actual flow for your HP requirements.
A 5/16 hard line is approximately .235 ID. Lets use 1/4" as the OEM return line.
If you use 1 GPM as the flow rate, then the 1/4" ID line is producing an estimated 15 PSI back pressure. (9.0 PSI @.8 GPM).
The pump is capable of providing this pressure to compensate for hose friction but your are at the flow limit for 1/4" hard line and loading the pump.
Same flow with a 3/8" ID hose is 1.8 PSI. The pump likes some loading so no need to operate it at no load.
Factor in your hose length, fittings and actual flow for your HP requirements.
#11
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...well, i just thought -8 on the other hand could be too much. If its really the case that -6 is a limiting factor i will go with -8 of course. Its not a big difference in price, but i was trying to add not to much weight as neccessary - as -8 is bigger than -6, it also weighs a tad more...
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...but one i have the lines under my car, i don't want to change these anymore - to change a pump is done in a few minutes, perhaps...
Every post of you guys is helpful in a certain way, but if one says "-6 is fine", there is the next who states "better go with -8" ...that doesn't help me much...
#16
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Agreed with above, stock lines are perfect. I made over 500+ no issues on walbro 400 and 43psi base.
Now running -8 feed and factory return, still no issues with controlling fuel pressure on factory return. If both walbro 400 pumps are on, it overwhelms the line a little and raises FP up to around 50psi but thats a TON of fuel. You should be great with one high flow pump and hardlines.
Now running -8 feed and factory return, still no issues with controlling fuel pressure on factory return. If both walbro 400 pumps are on, it overwhelms the line a little and raises FP up to around 50psi but thats a TON of fuel. You should be great with one high flow pump and hardlines.
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