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post #1 of 18 Old 12-02-2006, 12:39 PM Thread Starter
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Smile fuel systems ?

At what point does the oem fuel system (fuel rails and fuel lines) become unefficent (hp?)? I know there are a few people here who are making huge power with 30# injectors (moovs) but i didn't want a fmu. I was thinking about going to 42# (or bigger) injectors and was told that i needed new fuel rails and lines because the injectors would not get enough volume through the rails? I already have 30#'s and a 255 pump, but its losing pressure above 4500, (like 15lbs)

Also i was wondering about the injectors i am still planning to go to a 410w next year and i had heard that you can always dyno tune around too big injectors but not too small ? I was hoping to by my last set for a while and was going to buy some 60# injectors and use them on this motor and my new motor any input welcome
Thanks

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post #2 of 18 Old 12-03-2006, 07:51 AM
 
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if you go with 60# injectors you will need bigger fuel lines, rails and a bigger pump. If your plans are a 410w then you will deffinately need the bigger fuel system.

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post #3 of 18 Old 12-03-2006, 09:01 AM
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Going with slightly bigger injectors is what you want to do. It really depends on how much Hp your going to be making. There's formulas to figure that stuff out.

Larger diameter fuel rails are theoretically better because the pressure drop will be less each time an injector fires. This is especially true when you have a bank fire injection system as opposed to SEFI. I'm sure there have been posts about the capability of the stock fuel rails and how much power they will support. Take a look around on this site and also turbomustangs. If you find a thread about how much they can handle naturally aspirated, they'll be able to do only about 80% of that figure because of the BSFC of a turbo engine.

The fuel pump obviously needs upgraded. Again, it's going to depend on how much power you want but if you're using a stock block, you're limited to somewhere around 650-700. Dual Walbro 255lph pumps would work great for that setup and it would be relatively inexpensive compared to the bigger pumps. You wouldn't need fuel line any bigger than 3/8"(-6AN). It's been proven many times to handle over 1000hp.

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post #4 of 18 Old 12-12-2006, 09:19 PM
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I run 36's with a 255 in tank, stock lines and rails and no I repeat NO FMU.
Thanx Smurfy-"Huge Power" I like that, but I'm getting bord of it, I need more. If 700 is good then 800 must be better!!!

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post #5 of 18 Old 12-13-2006, 07:31 AM
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I would watch out with "losing pressure". That is what started all my headlifting problems. My fuel pump was dieing that is what caused the pressurre drop. Switched to a new 255 and no more drop.
Moovs-what headgaskets are you running again???
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post #6 of 18 Old 12-14-2006, 10:16 AM Thread Starter
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moovs you have meth is that the reason for no big injector and no fmu?? erich i have a brand new 255 pump and thats kinda the reason that i was thinking it was the injectors or fuel rail , i ordered a fuel rail and i was hoping that it might be a quick fix for winter,

i really want to put my .40 over 351w block together 410 with the jeggs/kasse heads and a 88mm turbo for x-mas please...... come on santa i'll take you for a ride when its done, promise
lol
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post #7 of 18 Old 12-14-2006, 10:18 AM Thread Starter
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rails coming i already have 20ft of -10 line i was hoping to use it, and i was guessing on this one but how about 2 255lph pumps in take and then y into the -10?? and use the factory feed for the return?
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post #8 of 18 Old 12-14-2006, 12:57 PM
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255 should be fine, you could run a Trex inline pump if you're still worried.

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post #9 of 18 Old 12-14-2006, 01:48 PM
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Im getting a Cartech renegade fuel system for my setup.http://www.cartech.net

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post #10 of 18 Old 12-14-2006, 05:45 PM Thread Starter
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thats was a nice kit, wayyyyyy outta my price range i think that i might be able to do it cheaper

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post #11 of 18 Old 12-14-2006, 07:03 PM
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Erich- o-ringed heads with the felpro gaskets, 1101 or something like that.

89'LX 306,T.W.heads,perf.intake,36's,stock cam/1.7's,70mmT.B.,T-56,3.27's,Twin 60/63 T3's intercooled,14psi,Evolution WG's, Meth inj.
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post #12 of 18 Old 12-14-2006, 10:56 PM
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Quote:
Originally Posted by smurfmobile8586 View Post
rails coming i already have 20ft of -10 line i was hoping to use it, and i was guessing on this one but how about 2 255lph pumps in take and then y into the -10?? and use the factory feed for the return?
You probably will be fine. Back in the olden days the common upgrade to the fuel system would be to run like a -8 feed line and use the old stock feed as the return.

--Admiral Aaron

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post #13 of 18 Old 12-15-2006, 07:46 AM Thread Starter
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olden days wow you mean back in the 1900's before the 2000 that must have been cool !! lol sorry

the -10 then is way over kill then? i am going to try the 30# injectors with the fuel rail when ever it gets here and if it doesn't work out then i don't know
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post #14 of 18 Old 12-15-2006, 11:27 AM
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No, like back in the late 80s and early 90s when we were all trying to figure out how to make these things go fast instead of following a cook book these days.

Yes, -10 is a bit overkill but with two 255s you should be fine perhaps it would mean putting on a -6 or -8 return line though. Probably just have to try it out to see.

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post #15 of 18 Old 12-16-2006, 08:55 PM
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The stock fuel rails are acceptable to use with 42lb injectors. Beyond that you must upgraded to reduce deflection in the rails. One thing you should never do is tune around something. You will invite problems of some sort down the road. Piece together a fuel system as funds will allow. You should plan on the preasure and volume you will be running with your new engine and this will lead you to the parts you need.
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post #16 of 18 Old 12-18-2006, 10:41 AM
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I have a set of rails for sale

Never installed UPR Blue Fuel Rails with fittings
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post #17 of 18 Old 12-19-2006, 05:24 PM Thread Starter
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well darn i just ot mine in the mail today
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post #18 of 18 Old 12-19-2006, 05:28 PM Thread Starter
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dna clean out your pm box i tried to pm you
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