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Re: Fuel pump for NOS
[Re: Cab_Burge]
#1537345
11/20/13 02:26 PM
11/20/13 02:26 PM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
OP
Not enough dumb comments...yet
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OP
Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
Quote:
I'm going to run a 100-150 shot next season. I'm looking at running a seperate line and small pump for the NOS will a simple 4-7lb 35-40 gph pump work? It's only going to be used when the N2O is flowing.
Do the math with the G force and then decide, another thing is will you add more NOS later?  I wouldn't run that small of a pump on anything I own, I know better  so do you  110 or bigger 
Cab this is just for the NOS, the primary pump is a Holley Black.
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Re: Fuel pump for NOS
[Re: challenger451ci]
#1537347
11/20/13 02:42 PM
11/20/13 02:42 PM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
OP
Not enough dumb comments...yet
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OP
Not enough dumb comments...yet
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Posts: 24,562
Brookeville, Md
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Quote:
I think it's more about the ability of the pump to recover quickly when the solenoid(s) open. Once everything is flowing at steady state, you're right, a small pump should flow enough on paper. Nitrous fuel pressure usually drops off when the solenoids open on the data log(on my junk anyway). A decent sized pump will recover and the pressure settles sooner after the hit.
So should I just run a 1/4" line off my black pump and be done w/ it?
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Re: Fuel pump for NOS
[Re: Mr.Yuck]
#1537348
11/20/13 03:31 PM
11/20/13 03:31 PM
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Joined: Mar 2008
Posts: 292
NY
challenger451ci
enthusiast
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enthusiast
Joined: Mar 2008
Posts: 292
NY
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Quote:
Quote:
I think it's more about the ability of the pump to recover quickly when the solenoid(s) open. Once everything is flowing at steady state, you're right, a small pump should flow enough on paper. Nitrous fuel pressure usually drops off when the solenoids open on the data log(on my junk anyway). A decent sized pump will recover and the pressure settles sooner after the hit.
So should I just run a 1/4" line off my black pump and be done w/ it?
I'm a fan of using a dedicate nitrous fuel system. IMHO it keeps things more consistent and allows for the future. Once you hit the sauce once, you're going to be addicted to it for life and will go bigger. I promise you that!
I don't think a Holley black with a 1/4" line would have the ideal flow/recovery for a nitrous system while also feeding the motor. I think a lot of guys use a Holley blue with an 803 regulator up to a fairly decent shot.
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Re: Fuel pump for NOS
[Re: Mr.Yuck]
#1537349
11/20/13 03:38 PM
11/20/13 03:38 PM
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Joined: Sep 2012
Posts: 1,563
Janesville, WI
SpareParts
pro stock
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pro stock
Joined: Sep 2012
Posts: 1,563
Janesville, WI
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Quote:
Quote:
I think it's more about the ability of the pump to recover quickly when the solenoid(s) open. Once everything is flowing at steady state, you're right, a small pump should flow enough on paper. Nitrous fuel pressure usually drops off when the solenoids open on the data log(on my junk anyway). A decent sized pump will recover and the pressure settles sooner after the hit.
So should I just run a 1/4" line off my black pump and be done w/ it?
No. That's too small of a supply anyway. Here's what I did and used many times, supplies the motor and kit. This will work great.
Holley black pump, 1/2" line to the regulator that fed the carb out of one outlet. I came out of the 2nd outlet into another regulator which supplied the fuel solenoid with a -6 whip. Set that second regulator to 5.5psi flowing through an .073f jet. I used this exact system spraying 175hp jetted 73n/73f. Even if you go bigger on the fuel jet you set the pressure through a .073f jet. When it comes to a good nitrous fuel regulator you can not beat the cheap Holley regulators
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Re: Fuel pump for NOS
[Re: SpareParts]
#1537351
11/20/13 04:16 PM
11/20/13 04:16 PM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
OP
Not enough dumb comments...yet
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OP
Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
Quote:
Quote:
I think it's more about the ability of the pump to recover quickly when the solenoid(s) open. Once everything is flowing at steady state, you're right, a small pump should flow enough on paper. Nitrous fuel pressure usually drops off when the solenoids open on the data log(on my junk anyway). A decent sized pump will recover and the pressure settles sooner after the hit.
So should I just run a 1/4" line off my black pump and be done w/ it?
No. That's too small of a supply anyway. Here's what I did and used many times, supplies the motor and kit. This will work great.
Holley black pump, 1/2" line to the regulator that fed the carb out of one outlet. I came out of the 2nd outlet into another regulator which supplied the fuel solenoid with a -6 whip. Set that second regulator to 5.5psi flowing through an .073f jet. I used this exact system spraying 175hp jetted 73n/73f. Even if you go bigger on the fuel jet you set the pressure through a .073f jet. When it comes to a good nitrous fuel regulator you can not beat the cheap Holley regulators
I have a 3/8 from tank to carb(s). I have the Fuel pressure set at 6.25 and I was going to add a seperate reg for the NOS fuel line. I have the original 5/16 hanging on the wall, I guess I could use that as the fuel feed line and run another pump.
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Re: Fuel pump for NOS
[Re: Thumperdart]
#1537353
11/20/13 05:56 PM
11/20/13 05:56 PM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
OP
Not enough dumb comments...yet
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OP
Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
Quote:
I'm going to run a 100-150 shot next season. I'm looking at running a seperate line and small pump for the NOS will a simple 4-7lb 35-40 gph pump work? It's only going to be used when the N2O is flowing.
Why oh why do people skimp in one of the most critical areas in hp and dependability is beyond me.............. 
not trying to skimp, I've never dome this before. How much fuel does a 100-125 shoot require? (thru the plates) it's only needed for maybe 10 seconds at 4-5psi (from what I've read) It's not like I'm feeding a 1050 dom atop a 500ci engine
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Re: Fuel pump for NOS
[Re: Thumperdart]
#1537354
11/20/13 06:04 PM
11/20/13 06:04 PM
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Joined: Dec 2003
Posts: 2,586
Illinois, Indiana, Louisiana
ProStDodge
master
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master
Joined: Dec 2003
Posts: 2,586
Illinois, Indiana, Louisiana
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Quote:
Why oh why do people skimp in one of the most critical areas in hp and dependability is beyond me..............
What???!!! You mean it doesn't make sense that since NOS is one of the least expensive ways to add HP, that I shouldn't install the least expensive system I can find?
Make little or no upgrades to the fuel system, or the rest of the drive line components to handle the extra HP because this is supposed to be "cheap" HP?
Make little or no upgrades to the safety equipment on the car for the new HP levels since I only use it when I try to go fast?
Break the car or motor by bumping the NOS jetting up for more HP than the kit is recommended for because I want to go faster for no more money?
Go on the internet and to car shows (since I now have to push my broken car) and tell everyone how bad and ridiculous NOS is?
Sorry, didn't mean to get off subject.
My 2-cents
If the system is to only be used occasionally, generally at stop lights with street tires to impress my friends, then I would just tee off the Holley black pump.
If I wanted to bolt on some slicks and try my hand once or twice at the strip, I would use a Hobbs switch (Low pressure switch) on the fuel system to shut off the NOS if the fuel pressure drops under 4psi. That way when the car runs, slows, runs, slows, runs, slows,.. while going down the track I would know I should upgrade the fuel system.
If I wanted to hang out at the weekly track Fun Night or bracket race regularly, or run more than the "125hp" pills. I would install a small front mounted fuel cell and separate pump for the NOS system.
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Re: Fuel pump for NOS
[Re: Mr.Yuck]
#1537355
11/20/13 06:05 PM
11/20/13 06:05 PM
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Joined: Sep 2012
Posts: 1,563
Janesville, WI
SpareParts
pro stock
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pro stock
Joined: Sep 2012
Posts: 1,563
Janesville, WI
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Quote:
Quote:
Quote:
Quote:
I think it's more about the ability of the pump to recover quickly when the solenoid(s) open. Once everything is flowing at steady state, you're right, a small pump should flow enough on paper. Nitrous fuel pressure usually drops off when the solenoids open on the data log(on my junk anyway). A decent sized pump will recover and the pressure settles sooner after the hit.
So should I just run a 1/4" line off my black pump and be done w/ it?
No. That's too small of a supply anyway. Here's what I did and used many times, supplies the motor and kit. This will work great.
Holley black pump, 1/2" line to the regulator that fed the carb out of one outlet. I came out of the 2nd outlet into another regulator which supplied the fuel solenoid with a -6 whip. Set that second regulator to 5.5psi flowing through an .073f jet. I used this exact system spraying 175hp jetted 73n/73f. Even if you go bigger on the fuel jet you set the pressure through a .073f jet. When it comes to a good nitrous fuel regulator you can not beat the cheap Holley regulators
I have a 3/8 from tank to carb(s). I have the Fuel pressure set at 6.25 and I was going to add a seperate reg for the NOS fuel line. I have the original 5/16 hanging on the wall, I guess I could use that as the fuel feed line and run another pump.
Does your carb like that low of fuel pressure? Mine really liked being bumped up to about 8psi. Fuel line is cheap man, is there a speed shop or circle track place near you? If you are plumming both off one pump come up to a 1/2 or -8 line. If you do go to a stand alone then supply the solenoid with a -6.
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Re: Fuel pump for NOS
[Re: Mr.Yuck]
#1537356
11/20/13 06:27 PM
11/20/13 06:27 PM
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Joined: Dec 2003
Posts: 2,586
Illinois, Indiana, Louisiana
ProStDodge
master
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master
Joined: Dec 2003
Posts: 2,586
Illinois, Indiana, Louisiana
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Quote:
not trying to skimp, I've never dome this before. How much fuel does a 100-125 shoot require? (thru the plates) it's only needed for maybe 10 seconds at 4-5psi (from what I've read) It's not like I'm feeding a 1050 dom atop a 500ci engine
The problem comes from the extra HP creating additional g-forces, which attempt to push the fuel back towards the tank. A small or weak pump will tend to stall or reduce flow at that critical point in time. As mentioned aboce, the NOS is entering the motor at 950 psi, and the fuel at 6 psi. At this 6psi, a 1 lb drop in fuel pressure can be a 16% change in air/fuel ratio.
Therefore most reliable NOS systems go "overkill" on the fuel system to insure the system is running at the air/fuel it was tuned for.
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Re: Fuel pump for NOS
[Re: SpareParts]
#1537359
11/20/13 07:29 PM
11/20/13 07:29 PM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
OP
Not enough dumb comments...yet
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OP
Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
I didn't realize it was a six pack. Very cool. My sperate tank is a 1 gallon. It lasts a few passes at over 200hp. I top it off just to avoid any stupid mistakes
only looking at 125 max...maybe 150 if I feel silly. What pump are you using?
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Re: Fuel pump for NOS
[Re: Mr.Yuck]
#1537360
11/20/13 08:11 PM
11/20/13 08:11 PM
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Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
Leon441
master
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master
Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
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Not going to beat on you for asking questions.
Simply put that 3-5 PSI pump will not push fuel to the front of the car when the nitrous is on. Your black pump will do fine for the carbs but the nitrous will be out of fuel a second after the car hooks up.
Y off the line just before the fuel pressure regulator. Run a separate holley regulator for the nitrous system. Buy a Y that has a gauge port on it. In that port install the Hobbs switch ProStDodge was speaking of. Leave the Hobbs switch set at the factory setting 7 psi. This will work fine sense the pump should push at least 12 PSI. When it does not the hobbs switch wired correctly will kill the nitrous.
You really could use more pump. Sense we do not know how much power the car has on motor or how hard it hooks it's hard to say how much pump you really need.
Car launches hard it kills line pressure to the front. The larger the fuel line the more it hurts the line pressure.
How much your car can MPH now in the 1/8 or 1/4 would give us some idea what kind of HP you really have.
I have run nitrous on a lot of cars that was fuel pump limited. I also installed a hobbs switch for security. Customers are always tight when it comes to upgrading the fuel system especially when they do not think they will become hooked on nitrous.
You can PM me some more about how your car runs now and I can tell you if you need more pump or if you can get by. I understand if you may not want to share with the world that information.
Leon
Career best 8.02 @ 169 at 3050# and 10" tires small block power.
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