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Old 07-01-2002, 06:19 PM   #1
dyswtric27
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Question Parallel fuel mod from ludespeed

Hey,

I got the parallel fuel rail mod from tom at ludespeed awhile ago and put it in. I'm just wondering how this thing actually works. Its a "T" that goes into the fuel line coming from the fuel filter. You then run another fuel line over to a some bracket that is on the stock fpr. Now this fuel line goes in just before the fpr, so i'm wondering how does it actually get more fuel to cylinder #3 since it seems to be after the injector?

I'm sure it works, i'm just wondering how and trying to figure it out. Since at the same time i have some low fuel pressures ( i think thats due to a busted cartech, but i'll have to see). Thanks.

Jason
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Old 07-20-2002, 08:00 PM   #2
Rich L
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bump...

Im kindof interested in how this works too.

Anyone have an idea of how much fuel the stock rails can flow safely?

With 370cc injectors the stock rails seem to work fine.
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Old 07-20-2002, 09:26 PM   #3
STiTuner
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Default Re: Parallel fuel mod from ludespeed

Quote:
Originally posted by dyswtric27
Hey,

I got the parallel fuel rail mod from tom at ludespeed awhile ago and put it in. I'm just wondering how this thing actually works. Its a "T" that goes into the fuel line coming from the fuel filter. You then run another fuel line over to a some bracket that is on the stock fpr. Now this fuel line goes in just before the fpr, so i'm wondering how does it actually get more fuel to cylinder #3 since it seems to be after the injector?

I'm sure it works, i'm just wondering how and trying to figure it out. Since at the same time i have some low fuel pressures ( i think thats due to a busted cartech, but i'll have to see). Thanks.

Jason
it lets some of the fuel pass the other cylinders so it doesn't all leak out through the injectors before it gets to #3. basically it evens out the fuel pressure by moving some of the pressure to right in front of the FPR causing the fuel to back up there.

I think that would be an easy way to kinda simplify it.

brad
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Old 07-21-2002, 10:42 AM   #4
KillerTHC
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do you have the intructions on how to install this unit? i have the parts from tom but i never got around to putting it in because i didn't want to figure anything out.
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Old 07-21-2002, 01:42 PM   #5
skywalker
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Here is what the Fuel Rail Conversion looks like. The red line is the added line from the Ludespeed "T" Fitting. The FPR is an aftermarket one with LudeSpeed's Fuel Rail Adaptor which has a barbed fitting for the red line to connect to.
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Old 07-22-2002, 05:15 AM   #6
KillerTHC
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ooooooh... ahhhhhhh... wanna do that for me when i get back bill?
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Old 07-22-2002, 09:05 AM   #7
Graham
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I did a writeup of this a while ago for RS25.com. Basically, after attempting skywalkers Parallel Fuel Line conversion, my dad, uncle and I came up with something like this.

It is practically the same thing, just that the fuel is transported to right before the left side fuel lines instead of after, to the FPR like the schematic shows. I also noticed a drop in fuel pressure.

http://www.rs25.com/_How%20To/Fuel%20Rail%20Mod.cfm


This has been up for a while now, but I don't think many people have really seen it on the site.
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Old 07-22-2002, 09:30 AM   #8
WRC 555
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The big difference would be that for the Ludespeed parallel fuel mod the intake manifold does not need to be removed.
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Old 07-23-2002, 08:50 AM   #9
Graham
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Yes but just think, when its off, you could always throw on a red coat of paint to make it look like an STi intake manifold. Plus, you are learning more about your car and its kind of fun, but I understand where your coming from.

Graham
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Old 07-23-2002, 10:59 AM   #10
skywalker
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Hey Graham,

Great writeup, I never even knew it was there. Well I will be forwarding poeple onto there now for the other version of the fuel rail mod.

Cheers,
~Bill
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