Billiumss

iTrader: (11)

I have the LS2 / LS3 fuel rail and since I have a turbo, I'm going to need a lot of fuel for when I turn up the boost. What are the signs you maxed out your fuel rail?

Increased injector duty cycle? WB goes lean no matter how much fuel you add at WOT?

I did some searching on here and Google, but it seems that people just say a HP number without ever saying how they found out. Anyone ever do any real testing or are they just guessing?

I gotta ask, what are the real HP limits of the LS3 fuel rail?

Mavn

iTrader: (3)

Ls3 rail using the shrader valve port as a return to a boost referenced regulator good for 1000 wheel

Billiumss

iTrader: (11)

Thanks for the reply but did you personally do this or just hear about it? How did you find the limit? What were the signs of being maxed out?


What are the limits of the fuel rail being dead headed? Has anyone ever done any real testing with info to back it up?

JoeNova

Measure fuel pressure both at the rail and before it.

Fuel pressure dropping inside of the rail means you are draining them faster than you are filling them.

Billiumss

iTrader: (11)

That makes sense. Looks like you can only do that on a dyno though.

Anyone ever do that method with a LS3 fuel rail to see where it maxed out at?

ddnspider

iTrader: (26)

Your c.i. and turbo won't get you to 1000whp so nothing to worry about.

Billiumss

iTrader: (11)

I know I won't make 1000 RWHP but where does it max out at? With as many views this has received so far, I'm going to guess that no one had actually did any real tests.

A lot people upgrade to aftermarket fuel rails but did they really need to? Is it good old fashion marketing?

JoeNova

Power will depend on fuel used, fuel pressure, etc.

You could probably do 1200whp with them under ideal conditions. The only way to know whether or not your conditions are ideal is to get it together and find out what it does.
Single 3/8" feed line has made over 1500 horsepower at the flywheel on oxygenated race gas before.

ddnspider

iTrader: (26)

What is the max speed of your tires? Have you actually tested it or just going off the MFR spec and others statements? Same thing, nobody bothers because either A) they aren't making enough power to be concerned (read: you) or B) they are planning on making a ton of power and since they have to do a fuel system anyways, the added cost of some rails is negligible.

Billiumss

iTrader: (11)

The question is not just for me but for others as well. There is a local guy with a 2010 Camaro M6, forged 416 LS3, ported heads, turbo cam, 88mm Turbo that I'm helping out. He bought the car recently, already built, but wants to turn up the boost. It also has a stock LS3 fuel rail but with aftermarket fuel pumps.

ddnspider

iTrader: (26)

Has he logged anything? Read plugs? Is it stock fuel system with just pumps or a return style off the stock rails with a new feed? 93 or E85? What base fuel pressure and static or 1:1 boost referenced? There's not a 1 size fits all XXXX hp limit is the threshold. Common sense goes a long way.

Billiumss

iTrader: (11)

Damn, could you be any nicer? Your right, common sense does go a long way.

If you want, I can waste my time and a write novel about the 2010 Camaro but I doubt that will help find the info I'm looking for. There is a limit for everything in life,

ddnspider

iTrader: (26)

"I have the LS2 / LS3 fuel rail and since I have a turbo" turned into "My buddy....". Your question has been answered on A) power level and B) how to test and see if you're a candidate for rails. You just dont want to listen to either so whats the point of this thread again?

G Atsma

Yep, the story CHANGED. And the short answer to OP's original question is, "it depends on a lot of things. There is no pat answer that you are seeking".

Billiumss

iTrader: (11)

No, the story has not changed at all, you guys must like stirring the pot.... We both have LS3 fuel rails, the same part, how is the story changing?

Let's make it super easy for you: LS3 fuel rail, 58 PSI, 93 octane fuel, FIC 1000cc injectors, no return off the shrader port (dead head) , 1:1 boost reference fuel pressure regulator, upgraded supply line, unlimited fuel pump supply.

I'm not trying to start a debate or anything, just want to know what the LS3 fuel rail can really support with real world testing. I'm starting to realize that no one has actually done any real testing, just guesstimate and roll with it.

G Atsma

At first you were speaking about YOUR setup, then further down you refer to your BUDDY'S setup. At no point was it said you were referring to two different setups. Hence the confusion.

JoeNova

The choke point on the LS3 rails is the 3/8" inlet. That means they compare directly to every other fuel rail with a 3/8" inlet.
Your question isn't LS3-rail specific, but you seem to want LS3-only numbers.

Billiumss

iTrader: (11)

Good point... So, with that being said, have you ever seen any flow numbers through a rail that has the 3/8" inlet used in a LS application? I know it won't be an exact number because there are variables.

I just wonder if the LS3 fuel rail can support more HP than most people think it can. I know it won't support 1,500 HP but I'm going to guess more than 750 HP with an average LS boosted setup.

Crf450r420

iTrader: (1)

The way to know for sure is put a gauge on the bleed valve and as long as you know the line from the pump isn't restricting along with the pump is keeping up with demand, but the pressure drops it's time for new rail.