Nos fuel pressure question
12-31-2001, 04:18 PM
#41
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Join Date: Nov 2000
Posts: 464
Originally posted by SprintMax
to best of my knowledge.. synki and i run different FP at WOT.. .. but we still round off to 80 - 85 PSI on 100 shot.. i don't understand the skematics and the underling of it.. maybe Matt or Thomas could explain futher.. but i don't think its a 40 PSI increase by the regulator.. i think the regulator will determind a FP by the amount of pressure and with the Stock FPR... which means.. say if you did run 65 PSI at WOT.. with the same fuel jet as stynki and myself.. you would still be at 80 - 85 PSI.. not by a constant PSI increase..
to best of my knowledge.. synki and i run different FP at WOT.. .. but we still round off to 80 - 85 PSI on 100 shot.. i don't understand the skematics and the underling of it.. maybe Matt or Thomas could explain futher.. but i don't think its a 40 PSI increase by the regulator.. i think the regulator will determind a FP by the amount of pressure and with the Stock FPR... which means.. say if you did run 65 PSI at WOT.. with the same fuel jet as stynki and myself.. you would still be at 80 - 85 PSI.. not by a constant PSI increase..
12-31-2001, 05:49 PM
#42
Originally posted by CoOlKidS1979
You said I THINK when you anwsered, and you said to ask Matt or Thomas, but I will try to ask the question again, here goes. Does the nitrous pressure regulator bring the pressure up BY a set amount depending on jet size, or does it bring it up TO a set amount depending on jet size? and Sprint thanks for answering my questions even though you didnt really anwser the last one I do appreciate it, and everyone one else who replied as well.
You said I THINK when you anwsered, and you said to ask Matt or Thomas, but I will try to ask the question again, here goes. Does the nitrous pressure regulator bring the pressure up BY a set amount depending on jet size, or does it bring it up TO a set amount depending on jet size? and Sprint thanks for answering my questions even though you didnt really anwser the last one I do appreciate it, and everyone one else who replied as well.
12-31-2001, 08:16 PM
#43
Originally posted by CoOlKidS1979
You said I THINK when you anwsered, and you said to ask Matt or Thomas, but I will try to ask the question again, here goes. Does the nitrous pressure regulator bring the pressure up BY a set amount depending on jet size, or does it bring it up TO a set amount depending on jet size? and Sprint thanks for answering my questions even though you didnt really anwser the last one I do appreciate it, and everyone one else who replied as well.
You said I THINK when you anwsered, and you said to ask Matt or Thomas, but I will try to ask the question again, here goes. Does the nitrous pressure regulator bring the pressure up BY a set amount depending on jet size, or does it bring it up TO a set amount depending on jet size? and Sprint thanks for answering my questions even though you didnt really anwser the last one I do appreciate it, and everyone one else who replied as well.
01-01-2002, 08:32 AM
#44
Originally posted by sx7r
ok, the nitrous pressure regulator brings up the fuel pressure via NITROUS PRESSURE - which is REGULATED by the jet in the bypass tee. the jet in the bypass tee does exactly what the name implies - it controls how much nitrous pressure is bled off into the intake manifold and the remaining pressure is what bumps up the fuel pressure. since nitrous pressure is basically what is bumping up the fuel pressure, with the jet in the bypass tee acting only as a regulator - then the amount the fuel pressure rises depends a lot on bottle pressure. lets say you use a .069 jet in the bypass tee(assuming stock FPR). if your bottle is at 900psi, then your fuel pressure may rise only to 75psi whereas if your bottle pressure is at 1000psi, fuel pressure may rise to 85psi on the same .069 jet. HOWEVER, if you assume constant bottle pressure at all times, then theoretically the nitrous pressure regulator brings up the fuel pressure BY a set amount. BUT, this is all in theory, because everyone FPR is different and reacts differently to a higher flowing fuel pump. this is exactly why NOS makes so many different jet sizes because everyone's setup is going to be a little different. once you get a kit and start using it, you'll see how everything works.
ok, the nitrous pressure regulator brings up the fuel pressure via NITROUS PRESSURE - which is REGULATED by the jet in the bypass tee. the jet in the bypass tee does exactly what the name implies - it controls how much nitrous pressure is bled off into the intake manifold and the remaining pressure is what bumps up the fuel pressure. since nitrous pressure is basically what is bumping up the fuel pressure, with the jet in the bypass tee acting only as a regulator - then the amount the fuel pressure rises depends a lot on bottle pressure. lets say you use a .069 jet in the bypass tee(assuming stock FPR). if your bottle is at 900psi, then your fuel pressure may rise only to 75psi whereas if your bottle pressure is at 1000psi, fuel pressure may rise to 85psi on the same .069 jet. HOWEVER, if you assume constant bottle pressure at all times, then theoretically the nitrous pressure regulator brings up the fuel pressure BY a set amount. BUT, this is all in theory, because everyone FPR is different and reacts differently to a higher flowing fuel pump. this is exactly why NOS makes so many different jet sizes because everyone's setup is going to be a little different. once you get a kit and start using it, you'll see how everything works.
01-01-2002, 09:57 AM
#45
Senior Member
Join Date: Sep 2000
Location: NJ
Posts: 5,630
Originally posted by dmbmaxima88
so that's why i ran so rich at 1100psi.
so that's why i ran so rich at 1100psi.
Thomas has spoken and answered. :_
Steve, what FP did you run at when you sprayed @ 1100psi? At that bottle pressure, i ran at 85psi exactly.
01-01-2002, 10:01 AM
#46
Originally posted by Synki
Thomas has spoken and answered. :_
Steve, what FP did you run at when you sprayed @ 1100psi? At that bottle pressure, i ran at 85psi exactly.
Thomas has spoken and answered. :_
Steve, what FP did you run at when you sprayed @ 1100psi? At that bottle pressure, i ran at 85psi exactly.
i ran about 93 but i liked running a little rich because it's safer and at that much bottle pressure i'm sure you needed the extra fuel.
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