Parallel Fuel Setup
 

Hey guys,

I just got my Aeromotive FPR and I'm trying to decide how to setup my fuel. I just read a post that said that S4 fuel rails will fit on my S5 which will make it much easier to build the parallel setup. Now I need to decide if I should just keep the fuel system in a series setup or spend the money and switch to a parallel setup. Is there any real advantage to a parallel setup?

I've got a TD07-25G, Haltech E6K, 1600cc secondaries, etc......you all know the drill. Would the parallel setup be better for this high horsepower setup or is the series setup ok?

Thanks for the help.

-Kenji

Parallel allows you to ditch the FPD, I believe. That's as far as I know about it.

I may be mistaken, but you may want to verify the S4 rails fit. I seem to recall hearing something about either the primary or secondary interfering with something else...though that may just be in an NA application.

Parallel rails are supposed to minimize pressure drop and turbulance when using large injectors. There's certainly nothing wrong with the series rail setup as it will make loads of power...but if you are going to an aftermarket regulator and SS braided lines, you might as well go for it.

That's not true. A PD is still required on each fuel rail (or at least the one with the big injectors) unless your pressure regulator has an integrated damper. Even then I would question that logic and still use a descrete pulsation damper.

The series setup will work. But parallel would be a good idea, the only real thing that will hold you back is whether or not you want to spend the money on the AN fittings and line (it can add up pretty quick)

IMHO going parallel doesn't become a necessity until well into the 450whp range. But there is no doubt that the fuel delivery to a large secondary injector setup is more efficient and less turbulent with a parallel arrangement.

Any suggestions on where to get an aftermarket Pulsation Dampener?

If I plan on going with.....850cc in the primary would that need a PD for that fuel rail as well?

-Kenji

I got mine at maren. Look up a thread by hondahater. He has a great thread on it. Also, I have one under, " progress thus far".... several pages in.

You only need 1 PD for the entire system.

Ok, that answers that. Now, if the S4 rails will fit on my S5 block, do the -AN fittings just thread in to the ends? Could it really be that simple?

-Kenji

here is what I did:
I have a j-spec S5 engine & intake manifold with a-spec S4 fuel rails (don't know if the "a" & "j" spec really matter) I had to grind down the mounting point on the (the boss that touches the lower intake manifold) on the secondary fuel rail.
I did this because the fuel injectors did not fit tight to the fuel rail.
The primary fuel rail fit just fine.

If I remember correctly it was about an 1/8" of material that I had to remove from both mounting points.

I did this a while ago so I don't remember all the details but I can tell you this....it will work but I spent a lot of money on fuel line and AN connectors.

good luck
-Bill

you need to buy metric adapters...don't remember the size.

This would be true if he was running the fuel system in series but since he wants to run the system in parallel wouldn’t he need one for each rail. Because each rail would be independent and have its own "pulsations" from the injectors.


Correct me if I am wrong

here is a pic of my fuel rails

and the diagram...I'm sure you've seen.

I do not think so. Both fuel lines go into the FPR. The PD even though is on 1 rail, the lines do not completely seperate fomr each other. They are looped. Now, if there was a true parralel, two fuel pumps, one to each rail and there own FPR's, then I would say yes. But, I could be wrong.

I went with a Parallel setup.

KG Parts FC Fuel Rails
-6AN Stainless Lines
Earl's Aluminum Fittings
Aeromotive FPR
Marren FPD - on secondary rail only
New Fuel Filter

Everything has worked out great with this setup.
Easily supported the 470rwhp that my car put out.
It was a little pricey, but well worth it when you are "doing things right the first time".

Here are a few pics of my setup.

sweet... i get to show my setup off again:) mine is run parallel

ding ding!

and the PD (if using a seperate one, not integrated into the FPR) is before the split in the line anyways....I suppose if you felt like buying two, you could mount one on each rail...but the single one works fine.

100 forum bucks?

Thanks for all the good info guys!

Comitatus, where did u get u're fuel rails? are they after market?

I'm actually getting ready to store my car in a couple weeks for the comming winter so I figure this will be something that is on going over the winter.

Thanks again for all the help and keep it comming if there is any more!!

-Kenji

Yep, they are aftermarket. I got them from Keith @ KG Parts.
His website is www.kgparts.com

Just shoot him an email.