no-one has mentioned a plate system.
To put Nitrous Oxide onto an A15, you will need to run an aditional fuel sytem. The secret to a good reliable system is a sound unvarying fuel supply.
The easiest way to install nitrous on an a15, would be to make a carb spacer plate and fit a single fogger nozzel to it. you can adjust the HP increase by changing the saphire jets.
The disadvantage datsuns have is a tiny fuel supply line from the fuel tank. I don't know if an extra fuel pump teed in before the factory mechanical pump would be able to supply enough juice. Bear in mind that if fuel pressure or supply volume is too low, (Or drops will you've got the squeeze on) the resulting lean out will melt your pistons.A mate of mine had this the first time he squeezed a brand new drag engine. He said it looked like the pistons has been disolved by acid. You also need to use spark plugs with a fat earth strap. Thin ones that protrude too far into the chamber will contribute towards preignition.
Nitrous engines like a camshaft with quite a wide lobe seperation angle. (112'+) Due to the increased combustion gases the exuast valve needs to be opened sooner before BDC, so that more of the energy of the expanding gas can be used to aid the evacuation of the spent charge. The upshot of this type of cam profile is that off the bottle perfomance will suffer.
I dont think that for 50 hp shot you'll need to worry about changing the cam. A single fogger kit should provide details of what jets to run with different fuel pressures.
I plan to bottle feed my s/cA15 down the line. A mate has an old plate system with no bottle he said he'll give me. I plan to buy a kit for my V8, so the two cars can share the bottle.

Ronald champ I never criticised you I just ask you some simple questions. None of which you actually gave answers.

1] you clearly wrote;
" Now, back to the issue.
A 50hp shot would be a dry system, "
Point is you can buy 50hp setup dry or wet. God knows what your 200hp coment has to do with it?
2] Still shows that you have no concept on how a carbie operates and how the dry setup would be affected by this.
3] The fact that you would prefer no NOS gives no insight into where you concluded to your opinion on why you think a stock motor shouldnt be fed NOS.

I guess I did criticise in this post, but not of your opinion, only of the fact you didn't exactly give any answers. Take it easy.
If I really did feel like criticiseing, I would be commenting on the last guys post

heres my two sense worth. my buddy has a kharman ghia this two webber 32/36's on it. he had an aircleaner cover(small rectangle, chrome) that has a 50hp wet jet in the top of it. the easiest setup ive evrey seen. had 1 feul and 1 nitrous inlet on the nozle. i put that on my a14 with a webber 32/36. oh yea its worht it. dont tune the carb. just run a wet setup. if you just use nitrous your not getting the reaction you should, so it only super-cools the intake air. when you combine the nitrous and feul in the nozle, as soon as it hits oxygen it reacts and forces 50times more oxygen(not air) into the petrol causeing the increase in power. a fogger that only cools the air also creates feul starvation and can cause it to run worse.

Quote:

Righteo:
1) i would say a 50hp shot would be dry given that i said a direct port system is good for up to 200hp or more.
i haven't actually ever put nitrous in a car but i have read plenty of magazines and "how to" articles to know that a dry shot of nitrous is good for 50hp and above.

2) i'm not to sure phunk. lets say it cant be done. now that i think about it you would need a wet setup, because these things have no O2 sensor and cannot detect the extra oxygen in the mixture

3) I've always considered N2O a bit "plastic".
call me strange if you must, but i would rather have an engine that had stronger 'rods, billet sleeves, forged pistons, shaved head and a lumpy cam that pushed alot harder constantly, than a stocky with a shot of N2O. its just my opinion, and if you want to criticize people for having one, then go ahead.

ya... i thinking will be too lean also
since there is more oxygen flow trough, but the flow blow same amount of petrol from the jet at the carb

so only way is to run a wet setup?
can i direcly inject n2o and petrol at the intake manifold straight after the carbie?

Along the lines of the questions Phunk posed.

There is now way you would run a dry system with the carby. You would run way too lean because you would have no way of adding extra fuel with the carby.

The only answer is a "wet" system where you are adding extra oxygen plus extra fuel at the same time. You don't necessarily need to use fancy fuel either.

i'd wonder if the stock exhaust will even flow enough to allow 50 hp.

Yes lets please clear things up.

1] Why would you say a 50hp shot of NOS would be a dry setup?
2] Dry setup on a carbie fed motor. Please enlighten on how you would setup the fuel delivery from the carbie. Might aswell run a blowthrough turbo setup if you are going to all the trouble.
3] Your opinion you wouldnt put NOS on a stock A15. Why would that be? Have you ever run any form of boost through a stock A series?

Education or Experience is the key.

Quote:

lets clear things up.

there are 3 types of nitrous systems.
Dry, Wet and direct port.
The Dry system is purely a jet (or 2 or whatever) that is put in the intake (usually 12" from the throttle body from memory) that supplies only N2O.

The Wet systems are a fogger nozzle that is also placed in the intake. however these systems supply a seperte fuel (usually of very high octane content) aswell as the N2O.
the benefits of the wet system is that it reduces detonation more than the dry system.

There is also a Direct Port system that is a seperate fogger nozzle for each cylinder. these nozzles are put in the intake trumpet (close to the injector.
these are even better systems because of the greater amount of N2O supplied by the extra nozzles aswell the N2O is "fresher" (closer to liquid) which creates a denser charge which helps combustion etc.....
these direct port systems are good for up to a 200hp kick!!

Now, back to the issue.
A 50hp shot would be a dry system, which means that no extra fuel would be added.
however more fuel may be needed because of the more oxygen present.
so as mentioned in a previous post an electric fuel pump and bigger lines may be needed.
the jets shouldn't need to be touched, as long as they are big enough to keep enough fuel for the added oxygen in the chamber.

In my opinion i wouldn't put nitrous oxide on a stock A15 or any stock engine until it had a few other mods.

I wouldnt bother trying to regulate fuel through the carbie. It already drives perfectly with out NOS, so why make it run poor without it.
If you are injecting NOS through a fixed size jet underneath the carbie. You might aswell inject the required extra fuel through a fixed size jet directly beside it. Thats the whole reason why you use a seperate fuel system.