I was wondering today...if after 7 or 8 runs, the pressure gets low on the nitrous bottle, woudln't it still shoot the extra fuel when I hit the button? If so, wouldn't the A/F ratio get to like 7:1? and if so, would it stall the car out or just smoke and run crappy? Can I put a gauge on the bottle to keep track of how much is in there, and at what point does it no longer work well? Getting a bit antsy to install this bugger...
as the bottle pressure drops the gain of power drops. your right the fuel pressure stays the same and will run richer and richer. a pressure gage is very help full. also a bottle heater and blanket will help keep your pressures up and consitant. the little gage that nos sells is not very dependable. ive had a few of them that will read as high as 400psi when there is no pressure on them. i use an autometer gage in my dash and a nos gage by the bottle. a purge vavle is also fun and will help the intial hit be good and not stumble.
So, when you get a shot of gas but not nitrous, will it stall the car, or just make it run horrible for a few seconds? I am not sure how much extra gas is shot in there on 150 hit.
usually it will stumble and you will lift off the gas wich turns off the fuel flow and the motor usually recovers the instant you lift. you usually noltice the performce of the nitrous droping long before you get to the point that it floods the motor. generaly i hear from people who just installed the nitrous that the system worked good for a little while then it stoped work as well then seemed to have no effect. that when you tell them they need to refill the bottle and they then get bummed that they have to spend more money. for some reason some people think that nitrous lasts forever once installed.
Hey Scott. Long time no see/hear. You'll have a blast with the Nitrous. I'm sure you've googled Nitrous a lot so you already know it can be harmful to your engine, tranny, converter, and wallet! If you do not already have one, a bottle warmer is nearly a must for a nitrous bottle. It keeps the pressure up as long as possible, and gives you more consistant e.t.'s (arguably). The warmer should have a built-in thermostat. A guage is a must also (it just makes sense). Another thing, I, personally, would not run nitrous without a Hobbs fuel pressure switch. It automatically cuts power to the nitrous solenoids when your fuel pressure drops into the danger zone (all nitrous and no fuel = bad news for engine). Also - I'd recommend an rpm window switch - to keep your nitrous from coming on too soon in the rpm range (harmful to engine) AND from coming on too high in the rpm range. If your drive train was to break (say, a broken u-joint), power to the nitrous solenoids would be shut off. Otherwise, the nitrous would cause the engine's rpms to blast to the danger zone. I know this sounds a bit much, but these relatively inexpensive items could prevent major engine problem$ for you. Yes, there are others out there who will only put the bottle in the back floor board and hit the button whenever they feel it's right - without gauges, blankets, brackets, safety switches, etc., - and have done okay with it. I can't argue that side of spectrum. Anyway, I wish you the best of luck and I'll know you'll have tons o' fun. P.S. The purge kit is fun - however, I rarely used mine because the initial burst of nitrous caused me to spin the tires. The 'gradual' load of nitrous worked better for me. P.S. If you want the immediate hit of nitrous on launch - and do not have a purge - you can do a quick "blip" in your burnout (not the water box) to purge the line. Edit: In my experience, when the pressure got down to around 875psi, the nitrous didn't "work well" (relatively speaking).
Hey Rick! Good to hear from you again! I have been looking at the window switch and the gauge. Never heard about the fuel pressure switch, and it sounds like good insurance! Thanks for the suggestions. Didn't you use this cam in a nitrous application? What times were you running with it?
edit: the numbers I gave were from a completely different engine and cam. Good luck. I'll check back in to see how it goes for you.
