I have a 76 Camaro that I am installing a new engine in.. The engine is a 10:1 383 stroker with JE nitrous pistons, JE HNS rings, 4340 crank, 4340 rods, and Dart 215cc Pro1 Aluminum Heads.. I built this engine for the soul purpose of running on large doses of nitrous. I have already purchased a NX Gemini Quad dual stage kit, and plan on a stage 1 of 150hp, and a 2nd stage of an additional 150hp (total of 300 shot). My question to you is mainly about the fuel system. I was planning on running a sumped stock tank feeding into dual Holley Blue's, and Y'ing into one large fuel line going to the front to my fuel pressure regulators. According to NX, the dual stage system must have a seperate regulator for each stage, so I will have a total of 3 fuel pressure regulators... My question is: should I run dual holley blues, or just one big badass fuel pump??? I know that if I run a dedicated system to the nitrous that I will have to run a return line to the tank. On a 300 shot on a small block chevy, a single badass magnaflow electric pump should flow more than enough fuel for the carb, and both stages of the nitrous system correct??? I am kinda leaning away from the dual holley blue's idea, and towards just one big badass pump... What do yall think???? Any input would be greatly appreciated.

 

Here is what I am doing:

1 gallon jaz nitrous enrichment fuel cell in the engine compartment
Holley Blue pump with a holley regulator with return line to fuel cell feeding the fuel solenoid
Holley 110 gph mechanical fuel pump feeding the carb

Cheap and easy, and you will have a nice dedicated fuel system. Also, you can fill the 1 gallon fuel cell with some potent race gas .

 

And btw, on a 300 shot you better be running some potent race gas anyhow heh.

 

This I know... the race gas thing... I'm currently running low 11's on 175 shot on a stock bottom end.. lol How large is your return line??? Do you have any pictures of your dedicated fuel system??? I would love to see them...

 

Its all in pieces in my room at the moment, but I have a pic of what I am copying:

http://www.thirdgen.org/techbb2/atta...postid=1442150

I planned on running a -6 AN return.

 

How safe is that under-hood setup?

Is it more efficient than running a second line from the gas tank?

 

Good question.. If you run a dedicated fuel pump for the nitrous, then you HAVE to run a return line (I've heard), so I'm trying to figure the best options for the fuel system on a 300 shot...

 

Hey 12second3rdgen, what kind of fuel pressure regulator is that???? It is running a bypass, correct??? What exact parts did you buy????? I appreciate it...

 

In the picture that is a mallory 3 port regulator. I will be running a holley $22 3 port regulator (the one that comes with the holley blue pump). You want to run a return so that you dont get air in the line before the fuel, otherwise you will go extremely lean whenever you first apply the squeeze.

 

Mean SBC,
With that size shot you have moved up to the point of making sure you have enough fuel.I would run two seperate systems.One pump for motor and one for Nitrous.You can run a small fuel cell for just N20 or you can tap a seperate spout in your stock tank. The holley blues will work. Make sure you have a return line for the N20 or the pump will burn up.The holley blues are decent pumps but if you can afford it use the Holley Blacks.If you were running a small single stage kit one big fuel pump would work.But you will be safer this way.

 

The fuel cell in the engine compartment is the easiest and probably the best way to go. I would run the Holley blue on the nitrous, UNLESS you are using the 10psi tuneup. I have found that the holley pump is very inconsisant at that pressure. I have used it on many many kits though that use the standard low pressure tuneup. These low pressure tuneups are very safe, and are actually what the kits were designed for. If you have any questions, feel free to hit me up, and I can answer them. As for the return line, I would use a cheapo Holley regulator. 1 IN and 2 OUT. 1 Out would go to the fuel solenoid, and the other out, you would put a small jet into, and return it to the cell. You only need a small jet to clear out any air bubbles, and to keep the fuel pressure from creeping. Have used this in low 9 high 8 second cars, and it works great. Feel free to ask me any other questions about the Gemini Quad. I have tuned many of them, and they are very good kits.

Scott 925-998-1517

 

Thanks for the info guys... I have decided to go ahead an do a 16 gallon summit cell in the trunk, and also a Jaz 1 gallon cell under the hood for the nitrous. The nitrous kit came with the 10psi tune-up specs, and that's what I was planning on using..

Scott, I may hit you up tomorrow, and ask you a few more questions...

Is it true that on the Gemini Quad you have to have a seperate regulator for each stage??? And if so, do you have to have a return running for each regulator???

Thanks.

 

Yes, you always want a seperate regulator for each nitrous kit, and yes you would want the bypass I was talking about for each stage. You could Y them together though and run 1 line back to the cell.
Feel free to call me.

 

What size line is that??? I was planning on going out to the fuel pump with 1/2" 8AN, out of the fuel pump and y'ing it into 2 6an lines to two regulators, and then to the solenoids.... 6an line is sufficient isn't it???

 

FYI: Those Holley Blue Pumps SUCK!!! Not to mention the blue pumps are prone to breaking the internal plastic pump vains. It doesn't take much for one of these pumps to take a dump. I've seen these pumps die more times then I care to say. These pumps are dog S H I T!!!

If your not in favor of running two fuel systems then my advice would be run one big pump. Your on the correct path regarding pump manufactures, go with a Manaflow Quick Star 500. This pump will in deed provide enought fuel flow for the engine and for the nitrous kit in your car. I know of on person in fact that uses this same pump in a frt mounted system that feeds both the motor and nitrous kit. Car runs mid 7.50's in the 1/4 mile.

Stay away from those cheap a s s Holley Blue pumps if you value your engine.

Good Luck!