That is a pretty steep claim. Got any data to back that up? I would be interesting in seeing it. Not that I doubt you, but I am just no familiar with it.

 

yeah hang on and i will get you the website

 

http://www.designengineering.com/pro...asp?m=sc&cid=1

there you go my friends

 

Not to NOS!

 

Dont run nitrous if your fuel system is maxed out. That's the crazyest thing I've ever seen on here. Also custom tuning is almost a necessity when running nitrous on a turbocharged car. Nitrous requires huge amounts of fuel.

Since the X's are stinking rich from the factory nitrous could be a good solution. Someone with a wideband should give it a try with a dry 30shot.

 

again, not true, nitrous does NOT require huge amounts of fuel. especially when you're only talking a 50-55 shot. you're only talking about a .018 orifce jet. how much fuel do you really think you can flow through that? as for the theory that it's dumb, i guess hot rod tuners have gotten it wrong for years! if your injectors or maxed out at 85-90% duty cycle it doesn't matter. if you spray a wet kit guess what? the injectors duty cycle doesn't go up. only thing that increases is the flow of the fuel pump. it has to keep up with the flow of a miniture orifice jet. if a stock fuel pump can't keep up with that then you're already pushing things too far on that setup. as for tuning...yes, i always recommend pulling 1-2 degrees timing for spray on anything around a 75 shot and up, but under that, it's more piece of mind. this is all unless you're running some 30 psi 1000 cfm beast. then you're in a whole other ballpark all together.

 

So my fuel system is maxed out and my IDC's are high and your telling me it's a good idea to reduce fuel pressure at the rail on an already maxed out system. Maybe if you statement was re-worded to say maxed out "injectors" instead of fuel system it would make sense. I like nitrous when used properly, but all too often it's not used properly - Hence the reason nitrous has such a bad rap.

Figuring fuel requirements from orfice size is something I dont know how to do. However I can give a decent guideline based on hp.

Assuming B.S.F.C. of .60 for turbo car and a 30 shot of nitrous that wil likely make 50hp on a boosted car due to increased air density and increased boost.

(50HP x BSFC of .60) / .80 (IDC of 1 injector) = 37.50lbs/h = ~393cc/m

That's a substantial amount of fuel for a maxed out system.

You can also figure how much a 1 or 2 psi pressure drop on the fuel rail will decrease overall flow of the injectors as well and can cause a lean condition right at the perfect time.

 

yes, you're exactly right about me needing to reword what i was saying. i think most people got my point.

as for the fuel consumption, you have to take into account more factors then just bsfc. for a 30 shot of nitrous you would use a 0.025 nitrous jet and a 0.017 fuel jet. these are in inch form. a 0.017 nitrous jet at 45 psi fuel pressure would only yeild 131 cc per minute. as i said before if your fuel pump can't keep up with 131 extra cc's for a couple of seconds then it's too close to the edge anyway, which makes the pressure drop at the rail a moot point. i DO agree that you have to be carefull not to effect pressure at the rail but we're talking about such a small amount of flow it's kind of irrelevant. if we were talking a 75-100 shot or more then as i said it's a whole different ball game.

I also agree 100% that nitrous has a bad rap due to people being careless with it. i never suggest it without knowing what you're doing or even using some simple preventative measures like a window switch, wot switch and a fuel pressure switch.

 

can you explain to me , how the evo 8 stock , but 272 cams and retainers , on stock boost gain 370 wtq. Its amazing to me. And i dont get it if that is true why the drag racers dont use it on the evo?
can you give me some explanation on this?

 

Lots of them do. How many EVOs do you see showing up at sanctioned drag events....close to ZERO! Those guys are trying to sell parts on here and all people do when they hear the word nitrous is cry. You would be seriously suprised how many cars are running it that you don't think are. As for the torque number, please go do some research on nitrous and its effect on the powerband at various rpm ranges. You will NOT find your answer here.

Mr. EVO IX...I think what he is talking about with running nitrous when your fuel system is maxed out is in reference to injectors more than anything. You still have to have enough fuel pump to handle the extra fuel, but with a wet kit your injectors don't matter. You can tune your fuel with the jets themselves. For reference...if I used the suggested jetting for a 50 shot on my kit, my car would run 8:1 AFR and make about 40whp. If I ran a really small jet (.012) I could get the AFR around 11:1 and the car picked up 90whp on the 50 shot. I ran the .018 with my .052 nitrous jet to get 11:1 AFR. I ran stock injectors even with the 175 shot...but I did run a Walbro pump.

 

pls can you give me the link?

 

Rob...I'll try to explain this the best I can.

Lets say you are spraying a 100 shot for discussion purposes. You have a nitrous jet and a fuel jet. The amount of n20 and fuel that they spray is always constant , regardless of engine rpm. If your engine is turning at 7000 rpm, that constant amount of fuel and nitrous is going to be spread out over many combustions. Now imagine you spray that same constant nitrous and fuel stream into the engine at 3500rpm....now you are processing the same amount but with much fewer combustions. Each explosion is now more violent and cylinder pressure is greatly increased and you produce a LOT more torque. Do it again at 1000rpm and you have split the constant supply of n20 and fuel 7 times less than you originally did at 7000rpm. It is still going to combust, and it is going to make astronomical cylinder pressure, resulting in a HUGE torque value. If I was to spray the 175 shot I was running at 1000rpm instead of at 3500-4K, it would have probably made over 1000ft/lbs.

Compared to a turbo, at low rpms like that the compressor hasn't even started working and is barely forcing any extra oxygen into the cylinders for combustion.

I hope that helps a little

 

thanks.

 

just blow it up with a 300 shot

 

only cools the intake air thats all it does so with that pretend you were running on a cold day as for nitrous it creates a bigger explosion creating more power than just colder air would do