I have a 95Z with a 383 stroker, worked heads, etc... Currently I am running a 255lph fuel pump along with 42lb injectors. I got those injectors with inetions to run nitrous. Well my mind is following a different path now. I am looking at bolting up a set of AFR 227cc lt-4 heads along wth a D1 procharger (approx 12-15psi). As I know the fuel system I currently have stands NO chance to support my new setup. I have looked and all the injectors I have found that are high impedence (sp?) for use with the stock pcm max at 42lbs. What kind of hp are the stock fuel rails rated for? What kind of software will I need to support the injectors I will have to use (F.A.S.T., DFI, etc.) Or is there a way to retain the stock pcm? I already plan on running fuelcell, inline pump along with stainless steel line with an fittings.

 

The fuel rails can handle quite a bit if you don't mind removing the stock fuel inlets and installing AN fittings. They are 5/8" diameter on the inside.

As for the fuel injectors, you can use an acceleronics box along with the stock PCM to drive 8 low impedence injectors.

 

I would have no issues installing an fittings onto the fuel rails. Do you just remove the stock inlets and tig an fittings onto the rails? If not, how do they mount (im guessing you have done this)? I looked at accels website and found a generation 7+ spark/fuel kit for the lt-1 is that what you are refering to?

 

Motron makes a 60# high impedance injector that will work with the stock PCM. But a low impedance injector will generally be faster in large sizes. If you're going with an aftermarket ECU, there are really no limits, since the popular ECU's will drive high or low impedance injectors.

To add -AN fittings to the rails, you actually have to cut the ends of the rails off, along with the swaged on stock connections, then weld in a -6AN or -8AN fitting. I've seen the stock rails support in excess of 1,000 flywheel HP, but it helps to run them in parallel rather than in series. That would require inlets on one end and returns on the other end on both rails. In the 800-1000HP range, you can get away with a single return, welded to the diagonal cross-over pipe in the front of the rails.

You need to estimate your flywheel HP goal and size the injectors and pump(s) based on that. At 1,000HP you'd be looking at at least 83# injectors and 450 LPH fuel pump capacity.

 

So I can run one fuel line from the pump going into a splitter before the fuel rails. At the end of the rails I can have two lines going into another splitter that would enable me to only run one return line back to the tank? Do you have any pictures or links to modified fuel rails?

 

>GM HighTech Performance magazine did an article a few years back on this and gave the part numbers for the an fittings and seals.
I unfortunately don't have the article right now, but maybe someone here does.

 

I run a -6AN line from the SX billet filter to the back of the engine, an NOS -6AN "Y" fitting, and -6AN connections welded to the back of each rail. Then a -6AN fitting welded to the diagonal cross-over pipe at the front of the rails, a braided S/S line back to a Weldon AFPR mounted under the cowl, and a -6AN line back to the tank. Proven to support 800 flywheel HP, 78# injectors, operating at 58psi. Dual Bosch 205LPH pumps, one in the stock tank location and one running off a sump pat the bottom/back of the tank. The outboard pump only runs when the nitrous sytem is armed, so the one 205LPH pump can easilly support 500 flywheel HP without the nitrous.

I'll post some links to photos... I don't have the links bookmarked on the computer I'm on right now.

 

I am in the process of building my fuel system, but I have put it on hold because I'm trying to figure out an issue with my 383. My setup is similar to Fred's, except the lines to the regulator will be setup a little differently due to my fuel rail covers.

As stated, you have to remove the stock inlets and some of the rail itself (to remove the steel ring inside it). Then you just tig which ever fitting you want onto the rails. Running in series is easier than parallel, but you can eventually run into fuel starvation problems.

You can buy the acceleronics box at http://www.acceleronics.com/versafueler.htm