snipes

i was wondering is it feasible to put NOS in an impreza

if it is would i have to change my headers and cam?
(and remove cat/muffler)

Adam M

Do you mean NO2? as in nitrous oxide? as in laughing gas?

brickboy

It's almost certainly possible -- but for serious gains you'd need to completely revamp the fuelling system (big injectors etc), remap the injection, remove the cat and sensors etc.

It would also have serious impact on the engine's longevity ....

MorayMackenzie

snipes,

It could be done. You don't need to uprate the standard fuel system if you don't want silly power... for instance, Nitrous Express have a wet injection system that basically mixes NO2 and extra fuel (fed from the standard system) at the correct proportions just before the NO2 injection point, which is often just before the throttle body, IIRC.

I wouldn't bother risking NO2 on a scooby... you'd get better long term results spending the money on a decent hybrid turbo. Then you just need to pop into esso a little more frequently, rather than sourcing more NO2 after every 2 or three minutes of giggle gas operation.

Moray


Adam,

NO2 mostly is, and this is really quite obvious, Nitrogen Dioxide, hence the "2", mostly.

If you ever go scuba diving, please let someone else mix your gas for you... I'd really miss our little arguments.

IWatkins

Just to be clear for those who don't know:

N2O = Nitrous Oxide (the good stuff)
NO2 = Nitrogen Dioxide (nasty stuff, don't go there)

We are talking N2O here.

As for the question, no reason why a simple system couldn't be used on a Scooby to fill in the gap before the turbo spools up without going for injector changes etc. Won't give increase in peak power, but certainly will pull harder from low down.

Cheers

Ian

Adam M

Hang on, so do we want to use, nitrous oxide or nitrogen dioxide.

I thought that laughing gas and nitrous oxide were the same thing, as in NO2. The point being that the concentration of oxygen per mole of gas is higher as there are two oxygen atoms per molecule.

Ian says N20 is the good stuff, which although has a higher concentration of oxygen than air, it is not as high as NO2.

The only thing I can think of is that NO2 is more stable than N20 cause of its bond structure, and would therefore not be great inconbustion as it may not be willing to give up its oxygen.

Moray?

Ian? Help!

IWatkins

Adam,

N20 = Nos, Laughing Gas, go faster gas, stuff you put in you car etc. = Nitrous Oxide = GOOD THING

NO2 = stuff that comes out of exhausts, brownish looking gas, one of the causes of haze, not good for humans, bad for people with asthma etc. = Nitrogen Dioxide = BAD THING

As for reasons why with regards to chemistry, no idea. I would guess that NO2 doesn't break down easily releasing it oxygen otherwise yes, it would be a much better gas to use.

There again, pure liquid oxygen would work as well

Cheers

Ian

Rob FTM

Actually just to hijack this thread a bit more, one of the reasons, if not the only reason that Semtex is so powerful is that a key ingredient, 2,2-bis(hydroxymethyl)-1,3-propanediol tetra nitrate, called PETN, has a very high amount of bound oxygen per unit volume of chenmical.

But I wouldn't put that into my engine


Rob.

JayDee

Chemistry Lesson

N20 is a bit unstable and not saturated (with Oxygen) which means it will burn easily with Oxygen giving out lots of ENERGY in the form of heat and pressure which then means more force, power to the pistons, etc.

NO2 is saturated and so will not burn, will provide no energy, and worse will combine with any water around (and there is a lot in the exhaust) to form Nitric Acid (HNO3) which will corrode anything it touches (except glass and certain plastics) like pistons, cylinders, valves, exhausts, manifolds, people who stand too close.

Mind you , I would have thought that N2O, once through combustion , will have oxidised to NO2 and so will do the same, which is why you only want small doses at a time

JD

[This message has been edited by JayDee (edited 20 June 2001).]

IWatkins

barge

NOS is a make/supplier of Nitros Oxide kits, thats were I think the mistake happend.

If you are going the giggle gas route check your insurance first, but make sure you are sitting down when they give you the answer !!!

snipes

thanks for the chemistry lesson guys
but i heard that N2O (known as NOS in the states) is 1/3rd the cost of a turbo
for a turbo on a 2.5 rs wouldn't i need the turbo new heads/cams and possibly an intercooler
and for install i think i calculated it to over 5k for all that stuff which i do not have

iheard u could get nos kits and diff fuel injectors for under 1k

(US dollars)

astraboy

I have Nitrous on the Astra. IMO its better than a turbo conversion for the following reasons;
1/ Cheaper. Mine cost 860 all in including fitting, setting up, before and after rolling road sessions and a bottle of gas.
2/ Simpler. It was fitted in a day!
4/ More economical. I only use it when I WANT to, not every time I put my foot down.
5/ Its stealth personified. It is no louder when I have the nitro on than when I have it off. just faster
6/ I can spin the wheels in all 5 gears in the wet.
The downsides though;
1/ a bottle of gas costs £50
2/ I can do a bottle of gas in 5 minutes of constant operation.
3/ Having a huge bottle in the boot.
However, The performance is what you are looking for and in my case it more than delivers.
top end : Genuine 130mph. the speedo was at 137 when I went through the speed trap and I had another 1000rpm to go.
1/4 mile: 15.5 seconds
0-60: 7.16seconds.
Not bad for a 14 year old 2l 8v Astra with 106k on the clock.
For reference, when I was doing the 0-60 runs, there was a 2l 16v turbo astra there which had been stripped out and the best it could do was a 7.06 second sprint.
On that alone its a winner.
I dont know if it would be as good on a scooby, but its worth noting that Nitrous is stored at -127 degrees centigrade and as such has a good effect at lowering the charge temp. I never get past the first bar on my temparature gauge when the nitrous is running.
astraboy.

philc

Asraboy - if you're in the 'bin there, dun that' category, how does the nos operate in real life?

I mean,

is there a button on the dash / steering wheel to apply the nos?

do u keep your finger on the button (or whatever) whilst injecting nos?

does it give a 'thrown back in the seat' effect?

when would u use it in an 'on-road' situation?

just curious....(and tempted, subject to your answers)

regards

stage 1

I have nos on my cossie and it already runs over 2 bar of boost and 8 injectors
Good clean fun but setup is the key.

In the mid I get 100hp extra which is fun in the rwd cossie but it is setup to run through the whole rev range so after the nos kick you get the turbo spooling up - roundabouts have never been so easy Probably just snap things in a scoob.

Martin

rsquire

Snipes.

One of the guys on the USA BBS