I'm running an edelbrock 1406 using a mallory adjustable fuel regulator, i'm trying to decide if I want to install a nitrous kit. I was wondering if I would need to increase fuel pressure at the same time I spray? My thoughts are the nitrous will add too much air and cause pinging/detonating. How would I set this up, or would my nitrous kit come with something to control that?

 

the same pressure you have in the carb would be needed for the N20 fuel line
like 6-7 psi for up to125

it's definately a good idea to have a seperate fule supply, but i've seen alot of guys run a stock pump, aftermarket mechanical and red holley pumps for both carb and n20.

it does pay to be safe with the n20 and use it's own red holley pump.

if i were to do a setup (and i've tossed the idea around alot)
i'd definately do a seperate fuel source.

starts adding up when you get n20 and all the gadgets and stuff to be totally safe, but it's gotta be a blast to have.

one of these days i'll do a setup, even if it's small kit, they have that cool factor

 

That's what I do, run a Holley Red for the nitrous system and a Holley Black for the engine itself. Haven't had any problems as of yet.

 

so you have a pump that gets the N20 from the bottle then? I was under the impression it was pressurized. I will certianly need to get better educated about how the setups works before trying anything. any good sources of information? I've been reading posts here in tgo, but havent really gotten any useful details.

 

Well, I use the same fuel line for the carb and the N0S. The bottle is pressurized but your main concern is the fuel pressure at WOT when you push the button. My instructions say that you must have between 4 & 5# of fuel pressure at WOT. I use a stock Chev fuel pump and a Holly "Red" pump in series with a Ford truck 3/8" valve that they use for switching fuel tanks. Here is a crude drawing of my system.

Auggie

 

thanks foir the drawing but it's almost non legable. So if i'm understanding, you basically switch on the pump for the N20 and it runs in the same line with your regular fuel then goes into the carb that way, or is that not correct?

 

Heres how it works. For normal street driving the stock mech. fuel pump cannot pull any or very little fuel through the Holly elect. pump. If you look at the diagram you will see that I have incorperated a Ford sol. used for switching fuel tanks on a truck. This sol. is normaley open so when the Holly pump is at rest it is bypassed and fuel is pulled from the tank by the mech. fuel pump to the carb. When I arm the N0S system the Holly pump turns on and the Ford sol. closes so that fuel will be pumped from the fuel tank to the carb and the N0S fuel sol. and not just go around in a circle.This system has been on my car since 1985 with out any burn downs because it matains good fuel pressure for both the carb and the N0S fuel sol. A must have is a fuel pressure gauge. I have an elect. Stewart Warner gauge. You do not want to plumb a fuel line to a gauge inside the car and always use an oil pressue swith for the elect. fuel pump. The Holly elect pump should not be able to run unless the engine has oil pressure.

Auggie

 

Ok, I see. What about my setup? I run an electric ford pump in the tank that feeds a regulator (4 port w/return) that feeds 6psi to the carb.

 

Do you have an oil pressure sw. for that elect. pump? Your next step is to buy a fuel pressure gauge and check your fuel pressure at WOT. You must have at least 5# of pressure at WOT because when you install the N0S fuel sol. you will tap into the carb fuel line with a brass tee.

Auggie

 

No I dont have an oil pressure switch, but it makes sense to have one. I will be getting a fuel pressure gauge here soon. I was gonna get one from a friend, but it was for high psi pumps and I wouldnt be able to read the difference of 4-6psi. I might put that on the incoming fuel line from the pump, but i will have on on the line to the carb from the regulator.

So the N20 will mixc with the pump gas, I wont have a plate that sprays it in under the carb? or am I thinking of a different N20 setup?

thanks for all this info, it's a big help.

 

Most fuel pressure gauges read from 0-15#. I mounted my elect. gauge sending unit right next to the carb inlet for accurate readings. (see pic). I have a plate that mounts under the carb and there are two spray bars mounted inside the plate. The top one sprays nitrouis at a 45* angle and the bottom sprays fuel at a 90* angle right into the nitrouis for better mixing.

Auggie

 

if you want to be toally safe, best bet is run a sump in the gas tank, have 2 seperate lines, one for motor one for n20 fuel, motor use the mechanical pump (or better yet a red pump) and use another red pump for the n20

yeah over kill for under 125hp, but it's safe and gaurantees fuel.

or use one of the high flow mallory pumps with the regulator and a fuel distribution block.

 

Yah, that would be the correct way to do the job all right but the system I am using is 1/10th the work and half the cost and I feel it is perfectly safe. I have had this system installed on my car since 1985 (did it all myself) with "ZERO" problems. Oh, wait a minute I did have a problem! The nitrouis filter became plugged and I hade to install a new one

Auggie