dradon03

iTrader: (2)

Just thinking about how to do up my fuel system for my FD. It will have KG Secondary Rail and stock primary rail typical 1600/550, with a Denso 50mm pump and Aeromotive regulator.

I see people with all kinds of different ways to tie this all up but I was trying to think is there an advantage to running a parallel system? I would have thought that maybe if the fuel is run in series but all the fuel is taken before it can reach the next rail it would blow an engine. But on the other hand if this were to happen wouldn't it still happen on a parallel system as well because there will be a T joint between the rails and it would happen here anyways.

Also does anyone have a list of the fittings they used? I searched and came upon Damian's which is for a parallel system but it doesn't list the fittings and also tried to PM some people but no responses. Any help would be really appreciated!

Mahjik

iTrader: (1)

Here's a decent thread:

https://www.rx7club.com/3rd-generation-specific-1993-2002-16/fuel-rails-series-parallel-537456/

Indian

iTrader: (1)

From what I see in here, alot of people base which way to run their system on Hp goals and budget.
The stock system run in a series setup. Alot of people have successfully run the series layout. I decided to run my fuel setup in parallel because I want to go way above the 500whp goal, and most single pumps (streetable) cant take you that far.

Some people Y two pumps into one line also, and this was popular a while back too.

In the end it comes down to piece of mind.

I am curtain that more people will chime in on this topic, although, there are quite a few threads that comment on these two setups.

As in fittings, it all depends on how you configure your lines and FPR. I suggest you draw it out and go from there. Kgparts and cjmotorsports both have complete engine room kits for series setup.

I have both and I love the cjmotorsports setup, not saying keith's rails weren't good (they worked great), but everyone has preferences .

Julian

iTrader: (14)

The size and number of fittings will need to be worked out on a case by case basis. Are you going to run -6AN or -8AN lines, tap to metric or NPT, which way are you going to route them, FPR fwd of UIM or behind, etc.? It is a simple system, best to draw a sketch of what you want to do. Then lay some PVC hose to get rough lengths. When you buy your hoses & fittings get a few extra elbows, etc. you may need them before all said and done, you can always return the unused items. Build hose fitting setups up from one end, install, route and then cut and terminate other end. Provide enough swivel feature in lines so and to prevent kinking. After completion of hoses, reinstall with appropriate o-rings or teflon as appropriate for your threading selection and tighten AN’s.

While you are playing you may want to bore Primary Rail to 13mm ID so as to reduce pressure drop, but be careful of the dog leg on inlet end wall thins out in parts so don't drill too far. I had purcahsed a Primary rails just to play with taps sizes, bore sizes, and drilled through waal at various points to measure wall thinkness.

As to parallel vs series; I really don’t think anyone is running enough flow to need the parallel setup when under 600 700 Hp, but some setups may require it for pump, FPR, filter layouts or whateverr you want to do; if that is what you want go ahead. I designed and laid it out once and ordered all the parts, but in the end stayed in series after studying other cars HP fuel systems.

arghx

iTrader: (3)

for your power level it's a waste of money

use all that money on replacing some busted interior parts or something.

dradon03

iTrader: (2)

My power goals are sub 500 rwhp. Rather atm it is even sub 400 rwhp.

Thanks for everyone chiming in. I thought that 6AN was already overkill I think hoses the size of my oil cooler hoses would be just too crazy but I am sure people with more experience than me would know better. Considering that I will be struggling to get to 80% duty at the power level I am going for I think that the 8AN hose would push the pump to much for what I am looking for at FWIW 8AN hose has an ID of 0.44" and the 6AN is 0.34" that is almost 30% larger!

FWIW, the regulator I chose is a 1:1 rate riser with the boost rate.

Julian

iTrader: (14)

The larger lines do not push the pump. Larger lines reduced pressure drop, just like larger wires do not change current, but they due reduce voltage drop.

Only negative is larger space taken up under the UIM AND larger bend radius unless your go with Goodridge's high end 910 lines, Kelvar exterior, convoluted teflon inner hose with smotth bore. Best of all worlds, light, very high temp, very tight bend radius and larger and smoother ID bore for given AN size. They are beautiful; check out Pegasus Auto Racing.

oo7arkman

iTrader: (2)

I really struggled with this same decision a few years ago when I went single turbo. Like Julian mentioned above I did some research and found that I would be just fine running the system in series just like stock. BUT I do not really ever plan on breaking the 500whp mark. It is just not what I want to do with the car. Not to mention running in series is very simple to set up and also more cost effective (less fittings and line to purchase).

The advice above is also great advice on how to go about planning out what fittings you will need. Just simply draw it out.

I am currently using the KG fuel rails and they perform great. I did purchase them before cjmotorsports released thier system and for purely vanity reasons I would like to replace my KG's with theirs.. The rail design is just really attractive, but it is also more expensive.

Good luck with your project!!

NoPis10

iTrader: (29)

I am actually working on my single setup as we type.
I ran it in series like the stock setup for simplicity. I also chose fittings that would hide the lines as much as possible for the stealth look. I also mounted the regulator where my cruise control use to be.
Here are some pics...





L8R

arghx

iTrader: (3)

There is a guy on here (J-rat) who is doing in the 550whp range on his FC3S with methanol injection. He is using the factory fuel lines and factory 2nd gen top feed rails with a single walbro pump.

WaachBack

iTrader: (21)

Since meth is a fuel, that isnt to hard to do if you run a lot of meth and toward the lean side with a rewired pump.