LS7 Feul Rail limits
Thread Starter
Burning Brakes
Joined: Feb 2006
Posts: 844
Likes: 46
From: Southaven MS
LS7 Feul Rail limits
I'm having trouble with leaks on billet fuel rails, and was considering using a stock LS7 fuel rail. I'm shooting for 1000rwhp with an F1a-94 supercharger. Anybody with experience pushing big power through these rails I'd like to hear from you.
Drifting
Joined: Feb 2006
Posts: 1,585
Likes: 15
From: New Hartford IA
Drifting
Joined: Nov 2007
Posts: 1,261
Likes: 26
From: Concord NC
Drifting
Joined: Feb 2006
Posts: 1,585
Likes: 15
From: New Hartford IA
Drifting
Joined: Nov 2007
Posts: 1,261
Likes: 26
From: Concord NC
I just switched over to aftermarket rails. Wanting to see if it helps anything at my power level to switch. I'm hoping it may reduce idc a tiny bit with the added volume at injectors. But will only help that if the factory rails were being sucked dry.
Last edited by Shoaf85; Aug 20, 2015 at 09:17 AM.
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Drifting
Joined: Feb 2006
Posts: 1,585
Likes: 15
From: New Hartford IA
Yes, I have aftermarket dual feed rails I tweaked to fit, but up to say 800 whp on e85 one should be good on stock rails with a return (way more on gas). My friend noticed much less pressure ripple in the logs with large bore aftermarket rails a long time ago so I always planned to use some when I switched to FI.
I attribute my fuel system keeping up due to the dual outlet fuel hat I made, good lines and high flowing rails, etc. I only run a 255/400 combo and it supported ~1000whp on e70-75.
I attribute my fuel system keeping up due to the dual outlet fuel hat I made, good lines and high flowing rails, etc. I only run a 255/400 combo and it supported ~1000whp on e70-75.
Last edited by slow ride; Aug 20, 2015 at 11:56 AM.
Thread Starter
Burning Brakes
Joined: Feb 2006
Posts: 844
Likes: 46
From: Southaven MS
I think I've resolved the leaking rails problem. I shimmed the rails up with a washer under the rail hold downs. Without the washer the rails were actually pinching the injectors into the intake and I guess that was distorting the upper O-rings in the rails. With the shims its not leaking anymore, but now I'm nervous that they could still leak.