Fuel rails
 

So I see tons of people going to dual feel rails because of some info? about the stock one not flowing fuel evenly.

Anyways I was looking around and found begi product. Anyone have a review or used\use the begi fuel rail setup?

Or you can just modify yours to be a dual feed, I believe there is a thread about that somewhere.

Drill/tap NPT one end of your rail and add a barb.

Or buy the Mtuned one (which I did) and never look back. Due to my horsepower goals I decided to go with something that had a larger inner diameter.

Didn't someone prove (Abe) that this made no difference?

Wether or not someone on the internet proved it doesn't make a difference, I will still continute to run dual feeds on all my high performance cars. Increased flow and equal presure across the whole rail is better.

For what it's worth, I witnessed this test. So while I guess I'm just a guy on the internet from your point of view, collectively, we are two guys on the internet.

Speaking of which, I haven't seen Abe around here in forever. He still owes me money...

Well.. if it's TWO guys.... ;)


Still, for peace of mind I think the fact that it cost $100 is OK. What exactly did you witness? How did you test the flow?

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IMO the most bad @$$ fuel system ever in a festiva lol... trust me, the big fuel rail and nice FPR will make a big diffrence in looks and performance :D

Not just two guys, mind you- two guys on the internet! :D

Abe constructed a test stand consisting of a fixture to hold a stock fuel rail with four injectors above four graduated cylinders. A hose was used to tap into his car's fuel system and the fuel pump was switched on to supply fuel to the test fixture. The fuel rail was from an NA with the FPR still attached, and it was set up to be operated in either single-feed or dual-feed mode.

Then, a Megasquirt was attached to the injectors and set to test mode. The injectors were run for a while at varying duty cycles, then stopped and the level of fuel in each of the graduated cylinders compared.

In each test there were some variations in the amount of fuel in each cylinder, however to determine whether this was due to variations between the injectors themselves or their position in the rail, the injectors were moved around and re-tested.

Basically, there was a measurable difference in net flowrate from one particular injector to another (regardless of its position in the rail), however the flowrate did not, on average, seem to vary substantially from one location on the rail to another. In other words, if during the first test cycle injector A in position 1 flowed 150cc and injector D in position 4 flowed 140cc, then on the second test cycle with injector A in position 4 and injector D in position 1, injector A would still flow 150cc and injector D would still flow 140cc. (the exact numbers here are made up, but that's basically the trend that the data revealed.)

Here's a picture of the test setup:

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I honestly can't recall what sizes of injectors we had available at the time. They certainly weren't anything really large like 750s (or Gotpsi's 1200s, which are just silly) so it may well be that at significantly higher flowrates than we had available, you'd start to see a difference. Whether this would be a product of the dual-feed-ness of the rail or simply the larger bore is a question for which I have no answer.

Wow, I had been dreaming up something of that sort in my head. Glad I dont have to do it now. I didn't figure a dual feed rail made any difference. Especially on a stock rail. Just seemed like another potential point of failure.

I'd imagine that with huge injectors a larger bore diameter and better FPR would make a difference though.

I have my stock rail converted to a dual feed, it was easy enough to do, But I have been wondering if when I start running E-85 or 100 if I should get a bigger rail.

I'm still on the stock rail and its doing just fine at 300 on the ID1000's and e85
If you're planning on flowing something ungodly like 500-600+ worth of fuel I'd also probably go with a larger rail.

And there were a couple people that did the same test as Joe and Abe, and the results were pretty much exactly the same. Patrick (patsmx5) did one too IIRC.

I was wondering about the higher HP but not to bad, 350-365ish whp on the corn.

Hmm, pretty cool. De bunks a new myths, but I still like my shiny black m-tuned rail :D. I'll keep pretending like it gives me extra power, even if it doesn't at least it looks pretty. I like the speaker wire for injector wiring... lol

Are you still running returnless? What sort of pump and FPR?

I knew I returned mine to stock for a reason.

Has anyone set up a return setup 1999 rail in a 2001 motor with dual feed goodness? I'd imagine leave the FPR on the end of the rail drill out the firewall end and drill into the top near the FPR (between 1 & 2 injectors)? The issue with putting it in the location in Joe's picture is that the FPR hits the intake manifold.