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Old 09-17-2013, 11:33 AM
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nitrous plumbing

I know that most of u will think this is a dumb *** question. But ive never used electric pumps or regulators before now so it's really all new to me. Here is my question. I have a fuel cell that does not have a bottom outlet.its at the top so I have to drill a hole and put a bulk head fitting in( or could I use the fitting that's on top?) Then I have a magna fuel 300 pump which has a bypass and of course will be using 2 2 port regulators. ( I think quickfuel most likely) and it is feeding a double pump holley. Im needing help on exactly how to plumb it and does mounting location matter on the pump? And what about filters how many and where do I need to put them? And on the regulators do I need to stick a guage straight on the other port? I know this is all basic atuff but ive always used mechanical pumps and never nitrous so if one of you could use this parts list and give me a step by step on the correct way to get from the fuel cell to the carb and solenoid and everything in between I would really appreciate it because cant find ANY plumbing diagrams on Google

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Old 09-17-2013, 07:46 PM
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Pumps

One port on the top of your cell should be a vent with a rollover valve, if it has no rollover valve in the vent, it needs one. The other should have a line running to the bottom of the tank, usually rubber and angled to the front right. As long as you mount your pump slightly below the tank, it should feed just fine. However, we have been running an old AC Delco pump on our Bocar since we got it in '85, and it is mounted slightly above the tank. Also we run a holley red pump above the top of the cell in our '67 Trans Am series Camaro. I would mount your filters before the pump to keep any garbage out of it. One should do the trick, two for redundancy maybe. As for the regulators, I have never dealt with the ones you describe. Perhaps another member can answer that one. But by no means should you knock a hole in the cell, that is just begging for a leak. Holleys like no more than 7 psi fuel pressure, unless they have been modified for more, and the holley reds have an internal bypass thats set at 7.

Last edited by Speedshift_Sam; 09-17-2013 at 07:48 PM. Reason: More info.
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Old 09-18-2013, 05:53 AM
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I mounted the pump last night its level with the tank and only about a foot away from it. If im running both nitrous and the carb at 6 pounds is it necessary to have a regulator for both or will one handle the pressure drop when the spray comes in? Also all these different style regulators and bypass stuff I dont understand the difference. What kind do I need?
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Old 09-18-2013, 03:39 PM
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And yes it has a vent and an outlet but I need another port to run the return line back to. If I plumb as of this up and I set the regulator for the fuel solenoid to wat NOS recommends then everything should b correct but is there a way to test it as far as making sure its not lean other than just hitting the button and hoping for the best
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Old 09-18-2013, 03:58 PM
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You would need to flow test the whole system (NOS plate + carb fuel needle seats ) while flowing at its maximum demand and at the running operational supply voltage, and then set the fuel pressure regulator.

If then you change the nitrous fuel jets and or the supply voltage changes, you have to do it again.

it is much better to have a complete separate fuel system for the nitrous system.
Not piggybacked to he engines fuel system.
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Old 09-18-2013, 04:12 PM
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If you are good with math you can calculate the combined orrifce area of both carb needle seats + the fuel jet in the plate. AREA not diameter.

Then test flow thru the calculated test orrifice into a big wine bottle to see the total GPH and set the regulator while flowing.

Easist to first fill the wide bottle with a known volume of water and mark that water level (say 1 quart US)
on the test wine bottle. measure how many seconds to flow 1 Quart of gas in to the bottle when at the recomended operating fuel pressure. Get the pressure set right first.
you need .1 gallon per hour per total horsepower nitrous+ engine.
if the fuel system cannot maintain the required pressure when all flowing, it won't work.
The nitrous sytem will be lean unless you do some fancy math and recalc the required fuel jet size , when at the system pressure to flow the specificed fuel per hour thru the nitrous fuel jet.

Then toggle the fuel solenoid on and off while its all flowing to see the dynamic performance of the system and fuel pressure regulator.

Last edited by F-BIRD'88; 09-18-2013 at 04:18 PM.
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Old 09-18-2013, 04:13 PM
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The higher the nitrous shot the more critical the fuel setup.
Area is pi x R squared... R ='s radius

pi is 3.1416 Verify the real supply voltage measured at the fuel pump + terminal using a volt meter, with the car running.
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Old 09-18-2013, 05:03 PM
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example:

2 x .110" needle seats + 1 .028" NOS fuel jet.... the equivelent test orrifice is .158"

( a 5/32" drill bit hole is good enough.) flow the system thru this 5/32" test orrifice. set the fuel pressure regulator.
Then measure the fuel flow volume . GPH. measure the supply voltage at the pump with the car running.

Engine horsepower + nitrous horsepower ='s total horsepower.
.1 gallon per HP per hour fuel flow at the system pressure.

EG 400 HP engine + 150hp nitrous ='s 550HP x .1 requires 55 GPH system fuel flow at operating flowing pressure.
fuel system Flow test thru the test orrifice should be 1 quart US in 16.30 seconds @ the specificed fuel pressure.

This is just a example of teh math for when a single regulator is used for the whole system... The 150hp nitrous system may not use a .028" fuel jet

Last edited by F-BIRD'88; 09-18-2013 at 05:10 PM.
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Old 09-18-2013, 05:18 PM
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If when you drill a hole to create a test orrifice, bevel the entrance of the test jet to break the sharp drilled edge
of the hole to eliminate the flow lose of the edge effect on a a small orifice.
Or the indicated pressure will be slightly to high and the flow slightly too low on the flow test.
A larger drill bit gets it done. Don;t get all carried away just smooth the edge.
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Old 09-18-2013, 05:35 PM
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Are you seeing the wisdom of using separate fuel systems?
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