I just ordered the gz lim and just wanted to see if the cj motorsport fuel system was modified to fit this manifold. If so, how much is it and where can I get it?
Thanks.

 

I have the new setup. It fits fine..straight bolt on. Excellent support from Brandon.

John

 

oorx7, your pm box is full.

I too am talking to xcessive and am going to get the lim, what would be involved in getting a single 4 injector top mount rail similar to the one excessive sells, but with the quality and finish of your kit. I guess it would be a one off rail. I will also be purchasing the dual fuel pump setup from you guys, let me know.

 

any pics on the new rail

 

on the website, cj-motorsports.com - look in the rx7 catalog, its the only item currently functional on the new website

 

I have the gz manifold and the cj fuel system, no problems here

 

I have a couple of functionality questions.

Why not just plug the primary injector ports and use all four of the GZ manifold ports with a single rail? This would simplify the fuel system greatly. Less fittings = less leak points.

Or if you want to use all 4 ports on the gz lim for injectors, you could run saturated injectors in the primary, and then run 4 smaller injectors in the gz lim. if you have the pfc, just run 4 p&h injectors and use the fjo driver to clone the signal to two of the injectors. So you would run 1 injector signal from the pfc to 2 of the input wires on the fjo unit. considering how high of a resistance it puts on the ecu signal, it wouldn't hurt a thing. Correct me if I am wrong, but wouldn't 4 smaller injectors create a better atomized fuel pattern?

Which one of these options would work best?

 

it all seems to be user preference since iv been looking. ive seen people do all of the above. the one that got me though is a rx8 450 primaries and 4 1000cc secondaries for better atomization.
z

 

I really don't see a point in running smaller than stock primaries. the PFC can dial the 550's in perfectly. And wouldn't 4 1000's create an issue with spiking rich once the secondaries kicked in? Or could it be tuned smooth?

The setup I am leaning towards is running somewhere between 550's and 850's for the primaries, and then 4 800's (or close to) as secondaries. Perhaps smaller if I can keep the duty cycles at a safe level.


Also: I found out why the primaries are closer than the secondaries. The closer an injector is to the combustion chamber, the better the throttle response. the further away, the better the power. I guess the distance helps with mixture. So running a single rail would really only benefit a vehicle that is in constant high rpm or boost. a street driven vehicle would suffer from the lack of primaries in the stock location.

 

This past week I've installed the GZ (Xcessive now) LIM, CJ Motorsports fuel rail and a 500R-SP. The turbo went in with no problems. The fuel rail and LIM are another story.

It actually wasn't TOO bad overall, just one problem. The bolt near the front of the engine on the secondary rail is hitting the fitting for the primary rail. At the moment I have them pressed against each other, and while they may not vibrate against each other or anything like that, just the fact that they're pressing against each other doesn't sit well with me. The only thing I could think of is if I had a 45 or 90 degree elbow coming out of the primary rail that is small enough to get by, or if the primary rail itself on that side weren't as long as on the rear.



This is the side that's hitting.


The other side is ALMOST hitting.

 

never seen that issue before... running an intake manifold gasket? has the manifold or flange surfaces on the housings been resurfaced? definately never had that complaint before! There should be no contact there at all... while it isnt likely to hurt anything, its not supposed to be like that.

 

ill post up pictures showing the clearance our engine has even without a gasket... there is no contact. perhaps variances in manufacturing tolerances on the LIM? our billet parts are going to be well within tolerance from one another, so we will have to investigate what has changed on your LIM to cause the clearance issue.

 

i am unable to tell by the photos, have you placed in additional spacers/washer to raise the primary rail any to accomodate a taller type of injector? due to the angles of everything, that would reduce clearance where you are having a problem.

 

I recently installed a GZ manifold but I used the KG Parts fuel rail that Keith made for the GZ manifold. It went in perfectly, no issues with clearance, no issues with leaking, no issues with normal size injector clips. I had no issues whatsoever. I am using 6x1680cc injectors and all injector clips plugged in perfectly.

On the KGPARTS secondary rail for the GZ Manifold I left the 2 center injectors angled closer the manifold and the outer 2 in the normal location, basically I just spun the 2 center ones backward. No leaks whatsoever and easy to unplug the 2 outer ones by hand with the upper manifold on if you need to.

A huge plus was the price and Keith sells the secondary rail for the GZ manifold separately. I sold my old secondary rail and put a little more in to get the new one. I got the rail in 2 days too since he has them in stock.

http://www.kgparts.com

Anthony

 

I do have an intake manifold gasket. Nothing has been machined nor resurfaced, I put the manifold on exactly how I got it, and I put the rails together and put them on exactly how they came, no washers added for anything. It's not the spacer for the rail that's hitting, it's the bolt itself. I'm assuming it's just the way the LIM is made. I ordered an elbow fitting today to fix the problem. I don't remember if he was ordering a 45* or a 90* elbow but either one should work fine.

I had a KG Parts kit on the car, and while it's a great kit and never failed me, I just didn't like how it bolted to the engine, it didn't seem sturdy enough. Plus my roommate needs to upgrade his fuel system anyway and he doesn't really have a lot of money to do that right now so it helped him out too.