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LS3 Fuel Rails Vs. HP

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Old 03-21-2011, 07:57 AM
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eric04
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Default LS3 Fuel Rails Vs. HP

How much WHP will the stock LS3 fuel rails handle before you need to upgrade them to better fuel rails?
Old 03-21-2011, 10:23 AM
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no one has any ideas?
Old 03-21-2011, 11:45 AM
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700 is about the limit on 93
Old 06-30-2017, 02:48 AM
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What is a good rail to upgrade to but will work with the stock manifold and ID1050's
08 ls3, A&A blower, cam and headers and x pipe. Right at 700rwhp
Old 06-30-2017, 07:14 AM
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EnviedC6
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Best bang for buck would probably be the Holley's. It's all about available volume in the rails, and almost all aftermarket fuel rails use the same size fittings.. Meaning, the internal volume capacity is similar.
Old 06-30-2017, 08:30 AM
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schpenxel
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Go to Holley's if you're upgrading

I'm at at least mid 600's on E85 on stock rails, no problems. I don't think stock is the restriction people act like they are. I've seen shops cut the Schrader valve off and install a real AN fitting there and then use the stock rails at 1000rwhp no problem

Last edited by schpenxel; 06-30-2017 at 08:30 AM.
Old 06-30-2017, 08:46 AM
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I'm guessing I'm gonna need to replace or upgrade because I'm pretty sure this broke off or isn't suppose to be like this. I'm over 700hp so I thought if I would benefit from upgraded rails I would try to do it.

Old 06-30-2017, 09:04 AM
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The stock rails can easily handle 700hp on 93 but I'd go with Holley since you broke it.
Might want to look into upgrading the fuel system if that's still stock
Old 06-30-2017, 09:13 AM
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Planning on probably going with the ECS Stage1 dependjng on how it will do with meth. The whole reason it's broken is because I was trying to find out fuel pressure at the rails because I have been having a drop in fuel pressure. Seems like the stock pump and the boost a pump isnt enough with the A&A supercharger. I would like to try to stay steady at 60PSI but I have been dropping down to 50 according to my gauge but I was trying to of make sure my gauge was correct and broke that piece off
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Old 06-30-2017, 09:21 AM
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**** happens for sure....Lucky you broke it off totally and didn't just over stress it where it breaks while pressurized. I did the same thing when over tightening a connector on an AN hose end.

When did it drop to 50psi? During heavy pulls? And did it smoothly drop or bounced around when on the throttle?

EDIT: meth? in the fuel, or spray?

Last edited by NJ_phil; 06-30-2017 at 09:28 AM.
Old 06-30-2017, 09:40 AM
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Yeah might as well go with some Holley rails then since you have to buy something anyways...
Old 06-30-2017, 09:48 AM
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Originally Posted by NJ_phil
**** happens for sure....Lucky you broke it off totally and didn't just over stress it where it breaks while pressurized. I did the same thing when over tightening a connector on an AN hose end.

When did it drop to 50psi? During heavy pulls? And did it smoothly drop or bounced around when on the throttle?

EDIT: meth? in the fuel, or spray?
Meth in the fuel. And it's not a drastic Or jumpy drop. As the car warms up I start to lose fuel pressure.The warmer the car gets the lower the pressure. I also lose pressure under boost as well. Once the fuel pressure has dropped it is very hard for the car to recover and bring it back up. If the car sits and cools down then it will be backup to about 58. The fuel pump is only about 6 to 7 months old So I'm pretty sure the pump is good. I was looking for a higher output drop-in pump but I can't find anybody that makes a direct drop in. I was thinking possibly the boost a pump is not working but I'm not exactly sure where to test it. I tested it at the hops switch and it came back 13.2v. I know that's connected to a vacuum line and probably won't turn on until boost has been reached. And then will probably show the 17 that it's supposed to be? But that's a whole 'nother problem
Old 06-30-2017, 09:57 AM
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The hobbs only controls a relay that switches on the BAP driver so it will always ready somewhere around battery voltage. I think the BAP has PWM output to the pump so not so easy to check with a DVM.

Sounds like the ECS stage 1 kit is what you need. I don't run it but a lot of others do and it looks like a killer setup for under 800hp. Fragola PTFE lines and their A1000 pump will handle E85 so it should handle meth at low dosages. Best to check with the guys there
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Old 06-30-2017, 10:19 AM
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Originally Posted by schpenxel
Yeah might as well go with some Holley rails then since you have to buy something anyways...
Just got off the phone with summit racing and Holly does not make 1 to fit my car because I still have the stock manifold. Guess I'm going stock temporarily until I figure out something else
Old 06-30-2017, 10:21 AM
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I think they are mistaken. I've tuned cars with them installed on both LS2 and LS3 vehicles with stock intake

Do some searching before you take their word for it.

Last edited by schpenxel; 06-30-2017 at 10:21 AM.
Old 06-30-2017, 10:35 AM
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https://www.holley.com/products/fuel.../parts/534-209

EDIT: Looks like it's setup for the standard shorty LS3 injectors and you'll need their 534-212 bracket kit for the ID1050s a lot taller.
Not sure if you run the stock plastic covers over the coils and if they will still fit

Last edited by NJ_phil; 06-30-2017 at 10:42 AM.
Old 06-30-2017, 11:00 AM
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Stock rails have made well over 1000rwhp time and time again. They are not a restriction until way up there. I don't know if anyone has found the limit.

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Old 06-30-2017, 11:44 AM
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Originally Posted by NJ_phil
https://www.holley.com/products/fuel.../parts/534-209

EDIT: Looks like it's setup for the standard shorty LS3 injectors and you'll need their 534-212 bracket kit for the ID1050s a lot taller.
Not sure if you run the stock plastic covers over the coils and if they will still fit
Just got off the phone with Holly and they do have the parts that I need so I ordered them. They were unsure about the injector height so I contacted ID and they said that the ID 1050's are the same height as stock injectors so I should be good without the 534-212 bracket.
Thanks for everybody's help !
Old 06-30-2017, 11:46 AM
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Good deal, figured they would work one way or another
Old 06-30-2017, 11:51 AM
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Originally Posted by Unreal
Stock rails have made well over 1000rwhp time and time again. They are not a restriction until way up there. I don't know if anyone has found the limit.
I have heard conflicting opinions about that. Some people say the stock rails are good up till 600 other people say they're good way past that. I'm right at about 700rwhp now So better to be on the safe side. Plus The Holly's look much cooler 😊


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