Gio93z

I own a 93 camaro LT1 but I would like to change over to the 94+ fuel delivery at the engine. I already have the correct intake manifold. If I purchase the 94+ style fuel rails and the plastic lines will it be a direct fit?

Thank you.

Injuneer

What are you attempting to accomplish? You'll still have batch fire as long as you have the 93 ECM. With the 94 hard lines, you'll be missing the 93's pulse damper. Not sure if the 94 crossover configuration is as well suited to the 93's batch fire..... could cause a sudden drop in pressure at each injector as four injectors pulse simultaneously.

What size injectors are you running?

Gio93z

Just trying to relocate the feed/return line hook up to the rear of the manifold in case I want to install my after cooler down the road. The after cooler set up is for 94+ LT1 and my fuel lines are in the way. 60lb Siemens injectors

Injuneer

My concern would be the impact of opening up four 60#/HR injectors simultaneously, with the rails flowing in series, as the 94+ rails do. But then I really don't know the details of what those two crossover pipes on the back of the 93 rails connect to. I run 78#/HR injectors, and we repiped the 94 rails to run in parallel - feed fuel into the rear of both rails, and take the return off a connection welded to the front crossover pipe. And that's with running full sequential injection, and running the system at 4bar (58psi) to minimize the effects of fluctuating pressure in the rails.

I just don't know enough of the dynamics of the 93 system to state whether it is set up better for batch fire than the 94 rails. But I do know that when you open the four injectors on one rail, with the rails flowing in series, that there is going to be a sudden drop in pressure, and it's going to be worse at the last injector than it will be at the first of the four injectors.

When you get the 94 rails installed, I would program it rich, and check for significant differences in the plugs between the groups of four cylinders - watch out for #2 and #7 running lean. My aftermarket ECU can be trimmed for each individual cylinder, but with the realigned rail setup, there was no perceptible difference from cylinder to cylinder, and we left the fuel to each cylinder identical.

Gio93z

I see what you mean. Without knowing the full details of the different rail setups I may just be better off leaving it alone. It's set up to run rich at higher rpm under boost and I have the boost juice injection into the TB at 7 psi anyway so I probably don't need the after cooler anyway