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I've read the last couple of posts on NOS systems.I'm still confused on the difference between a wet shot and a dry shot. From what I learned on Zex's site, is that a dry shot is fed with a nozzle that is tapped into the piping before your mass airflow meter. Want it as close to the throttle plate as possible right? Now how is a wet shot fed? Does it tap into your fuel rails and mix with gas when entering, to make it "wet"? As for Zex they listed a dry system for the miata 1.6, mx3 1.6 & 1.8, 626 2.0 & 2.5. Under Mazda for the wet system, they only listed miata 1.6. what's the difference anyway???

Originally posted by JdawgMx3er:
I've read the last couple of posts on NOS systems.I'm still confused on the difference between a wet shot and a dry shot. From what I learned on Zex's site, is that a dry shot is fed with a nozzle that is tapped into the piping before your mass airflow meter. Want it as close to the throttle plate as possible right? Now how is a wet shot fed? Does it tap into your fuel rails and mix with gas when entering, to make it "wet"? As for Zex they listed a dry system for the miata 1.6, mx3 1.6 & 1.8, 626 2.0 & 2.5. Under Mazda for the wet system, they only listed miata 1.6. what's the difference anyway???

S-----E-----A-----R-----C-----H

yes essentially a Wet System mixes in Right at the Injectors I believe... and it mixes the Fuel with the Nirous

a wet system has it's own fuel supply, whereas the dry kit strictly relies on your injectors for fuel.

dry kit....nozzle goes AFTER the airflow meter not before. nitrous sprays into the intake before the TB wher it atomizes before reaching the combustion chamber.

wet kit (ZEX anyway) you reroute the fuel delivery hose to the solenoid and then to the fuel rail. the nitrous line goes to the same solenoid there it mixes with the fuel and then they go together to the fuel rail. don't let the listing they have throw you.....the zex kits are pretty much universal.

<small>[ December 21, 2003, 03:45 AM: Message edited by: Darren Hyderman ]</small>

Thanks guys answers my question.

so with a wet kit there is no drilling into the intake manifold or anything like that? you just put like a splitter into a fuel hose and inject the nitrous straight in that way? that doesn't seem to difficult... if i buy a dry kit can it later be converted to a wet kit?

I prefer wet systems as they don't rely on the stock injectors with additional fuel pressure to increase fuel. This is bad because it is not always a linear relationship (had injector lab at old shop I worked out of). The lack of linear relationship means that your fuel requirements are not neccessarily dealt with and hence I consider to be a more dangerous method.

Wet system is as cre8v mentioned. Wet set-up simply means you are teeing off the main fuel line, and you inject both fuel and nitrous into the same nozzle. Why is this better? As long as your fuel pump can keep up, you will not run lean and you will not be hoping that injectors are going to do their job or stressing the injectors (higher pressures often affect injector spray patter/atomization/etc. too high and it's not pretty).

Ideal spot to inject the nitrous and fuel in the 'fogger' nozzle according to old research by NOS systems is 6 inches before the TB for best atomization. In case of a Swift intake, there was basically a spot for the nozzle from the factory in the right spot. It was rather convenient. I could see if I still have an old intake lying around and see if it would work on the MX3. If it did, you could have the hose. Although the shipping may be more expensive than doing it another way.

I used a 90 degree fogger nozzle... and from a reallly old page, still have detailed notes on the install in regards to my old Swift. However I can't see any model specific information that would affect your install really.

http://www.angelfire.com/de/ksj/nitrous.html

also be sure to inject at a reasonable rpm... you can add rpm activated switch to the mix if you're not confident of being able to control yourself. The more NOS you inject, the higher up in the rpm band you will want to go for safety.

<small>[ September 04, 2004, 09:48 AM: Message edited by: What ]</small>

how does a 50-60 hp shot of nitrous (wet kit) sound on a 1.6 dohc with just intake and exhaust done now... more will be done later on the car...

I can't remember if the engine build up pics I saw of the 1.6 dohc were miata or mx3... hmmmm, I'd say that if the motor 1.6 motor I was looking at is the same as the 1.6 dohc in the mx3.. 50+hp nitrous would be no problem as long as the fuel pump flows enough.

Activate 3500-4000rpms.

Mind you, a bunch of my information is based on searching... the problem there is every other post has different information and I don't know the guys well enough to determine who is full of it, and who is not other than the reply just yet.

Originally posted by What:


Activate 3500-4000rpms.

With timing retarded, I engage at the middle/end of first gear.

Originally posted by mx3man83:

Originally posted by What:


Activate 3500-4000rpms.

With timing retarded, I engage at the middle/end of first gear.

Sounds like you never use it on the street or auto-xing. *cough* Should be a good way to do it though. I set mine a few back from their 1 degree per 50hp suggestion or whatever it is they give.

I enjoyed nitrous most on the street in 2nd gear in the old car (ssshhhh). Slide sideways a bit and squeal away. I used to start earlier on a motor of similar build quality... that is, if these 1.6 dohcs are like the Miata 1.6s.