shermstick

Y does everyone shoot NOS? just asking bc if its safer or something i would like to do it. I would spray everywhere i go if its like that pssshhhhhhh all day. How much can i spray say like a 100 shot?

DerangedHermit

Y does everyone shoot NOS?

Compared to a TII conversion, it's a cheap source of horsepower.


safer...

Safer? Depends on if you like leaving your bottle heater on .


spray everywhere...

Nos is a short term horsepower adder. It isn't there to provide constant power. Just for something like a drag race.


How much can I spray...

You can set up your car to spray 150+ if you do it right. Easily, I'd say a 50 shot.

Makenzie71

No form of unnatural aspiration is safe in anything if used wrong.

DerangedHermit

Or for that matter natural aspiration.

YearsOfDecay

MAN you guys are just evil!!!

Anyway....

If you look at NOS as compared to adding a turbo system, the initial cost is MUCH cheaper to do a NOS setup. (as per dollars per horsepower added) However.. you gotta keep filling that NOS bottle up, and that can get expensive after a while.

BUT..... if you don't have the need to be flying around with your hair on fire all the time and want a little extra kick in the *** every now and then, NOS is a good way to go.

The safest is to do a WET system, where fuel AND NOS are injected at the same time.

The kits that are out there are pretty reliable for the 50-75 shots, once you get over that, I'd REALLY suggest hooking up a wideband O2 on the car to make sure the fuel is right, but then you are getting into fuel control systems and other complications that you may not be ready for. A lot of people, one at my local track, have hooked up the 50 shots on rx's and have had good results without blowing their cars up.

I would not suggest doing a 150 shot if you want your motor to hold together, especially if you are inexperienced and/or have an old, tired motor. Thats drag strip stuff there for guys who have a trailer to take their cars home!!!

Just remember, anytime you add HP to a car, things tend to break, it's just the nature of the beast. So, use your head and don't go apeshit with it.

Whizbang

I took away some HP and things stil break

Syonyk

My problem is I'd use NOS to do my highway merges. "Hm... truck doing 80? I can beat it." End up merging onto the highway in front of the truck doing 120 or something similarly sedate, and go flying past a cop.

-=Russ=-

SDrotary-FC

start out with a 50 shot and stay off the rev limiter

vicious525E

i always thought nos and rotarys=blown apex's

i always thought it would be cool to put a wet 50 on my tII, just, you know, to take care of the turbo lag.

cluosborne

As I understand it, what kills apex seals is lack of fuel.

aka_rocket

i remember reading somewhere that rotaries likes/handles NOS. i guess that meant the way the engine works, it can really take advantage of the NOS effect.

i'd go with turbo personally but it is cheaper (initially anyway).

cwsttu

yes the theory is rotarys are more acceptable to nitrous because all of the engine internals move in one direction... in other words a big shot of nitrous is not going to send a piston through your hood like a bullet out of a gun.... pistons move back and forth so violently thus making nitrous a bit risky.... though im not saying you wont blow a apex but its generally thought of as safer on a rotary by design of the motor

mr0pistons

I thought it was called nitrous...

cwsttu

yes i was very surprised nobody caught onto that... usually people get flamed for saying NOS..... but i guess the board was in a good mood today... notice how my post i use "nitrous" not NAWS

zjbarra

iTrader: (2)

In the end Nitrous is going to add extra oxygen in your engine making it so you can burn more fuel. If you don't have more fuel for the car to burn, that's when you run lean and can pop the motor. If you have a wet system that is compensating with enough fuel for your shot, it seems like it would almost be better (a tiny not very critical amount) than running a turbocharger of equal horsepower because your engine does not have to initially compress as much air in the compression cycle. A well tuned one in theory should be fine as long as the fuel added is tuned correctly to compensate for all factors such as the intake temp dropping dramatically when you mix a compressed gas that is at extremely low temperatures with the higher intake temps (this assumes you're doing it after the air intake temp sensor). But beyond that it's cheap and it gives you the power when you want it which assuming you're not just trying to race the entire world, is going to probably going to put less strain on your motor.

aka_rocket

yea, nitrous. i was just too lazy at the time to type it.

NZConvertible

Nitrous is not a substitute for a turbo. A turbo affects the way the car drives from small throttle openings right up to WOT. Nitrous should only be activated at WOT so most of the time the engine drives normally. Nitrous will never give you the part-throttle torque and flexibilty that a turbo does.

This will probably go right over everyone's heads though, since all anyone seems to care about is WOT and peak power...

cmjaure

well I am running nitrous right now and I am still trying to tune it I am running a 30 nitrous jet and a 22 fuel jet on mine right now it is a nos kit I can feel the differnce real good but i want more still.

scathcart

A good nitrous controller/standalone EMS takes care of part throttle activation for you... but I don't see why you'd bother on anything but a severely traction--limited drag car.

scathcart

Less chance of backfire through the intake manifolds than the piston engine counterpart is what makes nitrous considered safer on rotary engines. Relative straight, long intake runners and a lack of intake valves makes fuel puddlinga non-issue, and the intake stroke is completely separated from the exhaust stroke. This is the same reason why the rotary is one of the only engines considered to be safe for hydrogen injection, (with the renesis being even more-so adept due to its near non-existent overlap)

As for the bottle heater issue... I guess it only takes one moron to go public to scare the crap out of everyone.
1. If you install a bottle heater correctly, to take power from a SWITCHED voltage source, the bottle should never get hot enough to raise bottle pressures to the levels at which explosion occurs.
2. Whenever a bottle heater is installed, a nitrous pressure gauge should be installed and monitored. When you go into boost, you watch the boost gauge to make sure it doesn't go too high... why would you not do the same for your nitrous bottle?
3. EVERY nitrous kit manufacturer includes a safety pressure release valve. If your bottle pressure exceeds the preset limit, this valve opens and dumps the entire tank of nitrous outside the vehicle. Of course, if you're a moron, and don;t install it correctly, then you really shouldn;t have done the install in the first place.

The case of which I am sure you are referring to was an extremely limited scenario, where gross incompetence of the installer led to a rare failure. I have personally watch some of the old school dragsters heat up their nitrous bottles with heat guns/ propane torches: if bottle explosion was such a hazard, don't you think they'd be a little more careful (and their would be a lot more news of it)?

scathcart

That is about a 40 hp nitrous shot with an extremely rich fuel jetting... where did you get those jet values?
For that nitrous jetting, you should be running an 18 or area jetting for fuel. A 22 fuel jetting should really be run with a 37 or area nitrous jetting (about a 65 hp shot).

With your current jetting, I would imagine you're really only adding about 25 hp or so when you engage the nitrous. Change you jets and you'll be instantly rewarded.

cwsttu

hey scathcart... i was reading your website and i have one question... if i plan on doing up to a 125 shot do i need bigger injectors? or do i just need to buy new OEM injectors of the same size because i want new ones no matter what for extra peace of mind

scathcart

With all respect, that website is owned by Scott Mackenzie, another British Columbia RX-7 enthusiast.
He is selling his car byt the way... Good price and a nice car.

If you go with a wet shot, you can leave your inejctors alone completely.
And for 125 hp shots, you should go wet.

koukifc3s

iTrader: (3)

Hi could you recommend me a 70shot wet setup I can get online? I plan to install it myself and I know nothing about it.
Well I checked the FC3S.org install and it doesnt seem too hard if I go slow.

scathcart

NOS wet kit from summit racing.
www.summitracing.com
Part Number: NOS-05132NOS