you are not accounting for DCR which would easily meet or exceed 15:1 in a boosted application. you are just dealing with SCR which is fine for a n/a motor.


edit:

there are much better ways to spool a turbo before launching...and anti-lag comes to mind. even launching off a brake would be hard pressed to not spool a majority of setups. and nitrous kits are fine, but they all have room for user error....too much pressure in the bottle, and the nitrous noid may not even open. so all he would get is a shitload of unneeded extra fuel.

 

agreed but the question was how dose nitrous spool a turbo. i had a turbo 2.0 with a 35r with anti lag i could get 25 psi just fine.

 

What spools a turbo is high velocity exhaust gasses. Any way you can get more fuel combusting to make those gasses at launch is a good thing. By dumping a lot of fuel along with nitrous to supply the needed oxygen to burn that fuel, you have instant excess exhaust gasses to spool your turbo. A brake and 2 step do the same thing by dumping excess unburned fuel and oxygen into the headers. Once there, it burns and again, you have some extra exhaust gasses to spool the turbo. Taco farts might even help. It couldn't hurt.

My setup just using the tranny brake and matting the accelerator at the line will make about 7 psi of boost. Not outstanding when compared to what the big guys can do but still it's not too bad when you consider that they sell supercharger kits that put out less than that at peak boost.

I've run supercharged cars and turbo cars. I prefer the turbo cars. I've never run nitrous. No particular reason for that. I just haven't gotten around to it I guess.

 

i was elaborating as to one of the many possibilities as to why his witnessed boost+nitrous encounter went slower than no nitrous at all.

 

Honestly, the only difference between running no nos and running the juice is instant power. Make a run w/o the bottle, and then turn it on and feel the difference. It's INSTANT. Will things blur outside your car? No. Will you blow blue flames out the exhaust? No. Will you FEEL the difference? YES, you will. How long does it take to install it? About an hour...Less if you know what you're doing. More if the kit is more complex or you've never done it before. Will it break the bank? No. It won't. Unless you don't follow the directions. Then, you will break something......Which COULD break the bank. Low cost in, and low payments over time. Turbo, you'll have a HGUGE bill up front, and then nothing over tiume. You also won't feel the hp difference unless you let it spool up, then yes, you will feel the difference.

So, Turbo in a 250 hp/250 ft lbs tq max car = 400 hp at the top of the track.....But down low, getting off the line (which is where you need the power in a drag car) you will still have the same power you had before you put the turbo on. 60ft in, you may have full power of the turbo...maybe.

Nitrous in a 250/250 car = 400hp (with a 150 shot) at the top of the track.....However, when you take off the line, you have an instant 150 extra hp on top of what you had before. This follows you down the track.

With all things monetarily being equal (NOS over time equaling out to the same as the turbo) then I would prefer to have the NOS wiht it's instant power off the line. If I were running the car on a road course, I would go with the turbo.

 

I've only heard one...I take that back 2 people in my life say this, and the second realized his bottle was off

 

The combination he was talkin about was a low compression, nitous set-up, it had no boost. Claims were made that it didnt like the bottle (car slowed down) because of low compression.... Honestly, dumbest thing Ive ever heard.

 

It takes MORE nitrous on a high compression motor than it does on a low compression set-up. Higher compression motors have more heat geneated in the cylinder which takes more nitrous to get the cooling effect. This is why high comp set ups can run 2,3,4 stages with a total of 750+ on the nitrous. Come out to a couple big races with us and you'll shake your head at some of the B.S you've heard flyin around

 

i personally see no need to run 3 or 4 stages... typically, at most its been 2, or a controller. the thought is you have the 1st stage to maximize the hit and not blow the tires off and then the 2nd stage rolls on and your going. hitting the gas after 150' or so is just lookin for some MPH or doggin someone.

and nitrous' BIGGEST misconception is it cools...it cools the intake charge...that is it...wanna run an intercooler nitrous sprayer, rice on! once that nitrous gets past that intake valve, thats it...more cylinder pressure means more compression which means more friction which means more heat. whatever cooling you had in the intake tract was completely negated the second it gets in the cylinder.

nitrous usage is not dependant on compression either...its dependant on how much those little jets can squeeze out. all nitrous does is add an extra molecule of oxygen into the equation and changes the oxygen content.

roughly atmosphere is 80% nitrogen, 20% oxygen...N2O is 66.67% nitrogen, and 33.33% oxygen...this is typically why N2O is used its hazard is minimal and gains are significant....hypothetically speaking...you could use 100% oxygen, and theoretically achieve 5x the horsepower of the equal atmospheric motor....but you keep that fire hazard to yourself.

 

im going to just assume you have never owned or driven a turbocharged vehicle.

it'd be nice to have someone like you making the rules at the track though...give us turbo guys some weight breaks instead of giving the damn advantage to those nitrous guys...even though they really do need it