does anyone know how much power the factory fuelrail can support in my 93 z28 and in the 94-97 lt1 cars..... thanks for the info...
chase

 

quite a bit...
I cut the ends off the back and ran AN line to the rail, there are many ways to do it but the rail itself can flow pretty good

The stock system...I have not a clue I would guess 450 h.p. NA with a good pump but i don't know

 

i think the factory system with a dual walbaro is good for about 700 rwhp but if you do the fuel rail mod and add an aftermarket fuel regulator i think it is good for 1000 flywheel horsepower. others chime in if i am wrong here, i tried doing a search on this and have started a couple threads on this, do a search and see. there is good info on how to do the mods!

 

the 93s are a little more restrictive tho, there is a tube on the inside of them for a fuel return since there is no cross over like the 94-97 has. you can put an fittings on 93 rails but its a lot more work than a 94+ rail is. heres my 93 rails with an fittings welded in

 

Anyone have pics of 94+ with AN lines/fittings? I was thinking of modding mine since i'm about to install dual intanks.

Ken R.

 

wow thanks for all the info i will also look into it some more.... thanks again

 

I've done 635rwhp/700tq on my '94 with stock fuel lines and rails.

 

The stock diameter lines are fine at 800HP.... the rails will start to show a differenece in pressure from the inlet end (#8) to the outlet end (#7) if you continue to increase flow excessively. That leaves you with unbalanced injector flow. Putting the rails in parallel, rather than in series helps solve the pressure imbalance issue. I run 800HP on a 300-shot of DRY nitrous (all fuel through the 78# injectors), with a single -6AN supply line, splitting into the rear of each fuel rail, and a -6AN return line off a fitting welded to the diagonal cross-over pipe on the front of the rails, to a Weldon AFPR under the cowl.

Approaching 1,000HP you need the full parallel configuration, shown in the photo above, and an -8AN line might be in order. A buddy on mine used the stock rails, running in parallel for a 383 with 20+# of Vortech boost, making 1,125 flywheel HP.

The 93 rails are different though, as noted in a post above.