Nitrous Usage
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Nitrous Usage
I did a search for this but was unable to find results here are on the net. Maybe somebody here with better seaching skills could point me in the right direction to answer this question:
I was wondering how much nitrous is used during 1/4 mile pass according to horsepower. Like 150hp of nitrous uses how many pound of nitrous per 1/4 mile pass. Is there a calculator or chart on the internet for this that would show say from 100hp to 500hp in 50hp increments?
I was wondering how much nitrous is used during 1/4 mile pass according to horsepower. Like 150hp of nitrous uses how many pound of nitrous per 1/4 mile pass. Is there a calculator or chart on the internet for this that would show say from 100hp to 500hp in 50hp increments?
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The old general rule of thumb use to be...
100hp=1lb in 10seconds
so, say
200=2lbs in 10 seconds
50=.5lb in 10 seconds
500=5lbs in 10 seconds
so if you go 15 seconds just multiply 1.5 times your lb useage! A 200 shot would be 3lbs in 15 seconds useage....
One other thing to know.....a 10lb bottle would last 100 second at 100 hp. However, must sytems don't perform well below 20% full (just think of a standard 10lb bottle is really at 8lbs, useage). So, say 80 seconds instead of a 100 seconds. The less shot you have the less you'll notice the bottle surge in the last 20%. Import guys hit so little they may not even notice N2O bottle surge
This is assuming standard rich jetting numbers that the big companies quote you. A leaner setting might get you 10% or so, more power (on Nitrous power). But could go boom..and there is little room for error.
175 at 8.9 seconds = .89lbs for 100hp...so, 1.75 times .89...= 1.55 lbs per run. On a full 10lb bottle, 5 runs should be good (shooting for 8lbs useage max out of the bottle)....You really don't have to calculate out if you just remember the general rule it will get you close!!!
Jimbob
100hp=1lb in 10seconds
so, say
200=2lbs in 10 seconds
50=.5lb in 10 seconds
500=5lbs in 10 seconds
so if you go 15 seconds just multiply 1.5 times your lb useage! A 200 shot would be 3lbs in 15 seconds useage....
One other thing to know.....a 10lb bottle would last 100 second at 100 hp. However, must sytems don't perform well below 20% full (just think of a standard 10lb bottle is really at 8lbs, useage). So, say 80 seconds instead of a 100 seconds. The less shot you have the less you'll notice the bottle surge in the last 20%. Import guys hit so little they may not even notice N2O bottle surge
This is assuming standard rich jetting numbers that the big companies quote you. A leaner setting might get you 10% or so, more power (on Nitrous power). But could go boom..and there is little room for error.
175 at 8.9 seconds = .89lbs for 100hp...so, 1.75 times .89...= 1.55 lbs per run. On a full 10lb bottle, 5 runs should be good (shooting for 8lbs useage max out of the bottle)....You really don't have to calculate out if you just remember the general rule it will get you close!!!
Jimbob
Last edited by jimbob; 09-29-2005 at 05:57 AM.
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Thanks for the info guys. On another racing forum I visit this guy's car runs 8.90s in the 1/4. He claims he is only spraying a 175 shot but using 3 pounds of nitrous per run. People accused this guy or someone else of drilling his nitrous jet. I'm not getting into the middle of that one but it made me curious to find out what normal nitrous usages was. Thanks again.
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Originally Posted by 1slow01Z71
100 shot I get 4 good hits off of it( ) and the 5th is strong at first but trails off.
three83 If your guy their, is using 3lbs in 8.9 seconds, he's shooting some serious N2O. Something like 350 to 400 depending on useage. If he purges a lot though, before the actual run, it might be 300 to 350 a run...Still a big shot!!
Jimbob
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three83 If your guy their, is using 3lbs in 8.9 seconds, he's shooting some serious N2O. Something like 350 to 400 depending on useage. If he purges a lot though, before the actual run, it might be 300 to 350 a run...Still a big shot!!