Contour Enthusiasts Group Archives Forums Modifications Zetec Maintenance installed nitrous in my zetec today

Any video/audio yet?

Stephen

Says who?

Only if you're running lean or are running way to large of a shot.




Actually, a regular wet system will be plumbed in just like a dry system, requiring only one fuel nozzle and one N2O nozzle or sometimes even both merged into one nozzle for fuel and N2O. What you speak of is what's known as a direct port wet system which is much more expensive and complicated to install, requiring a fuel distribution block and fuel and N2O nozzles for each individual intake port. It does work better though.

Interesting stuff. So to kind of summarise...
Quite a down side to nitro if you run at WOT for more than 15 seconds because your engine melts. Great for ¼ mile runs though.
So with a wet nitro system, the NO2 is squirted in through a jet fitted next to each fuel injector in the inlet manifold which in the case of the Ztec means 1234 – 4 jets. Each connected back to an on off solenoid valve controlled by a switch on the throttle body which operates at WOT – all overridden by a conveniently located switch inside the car.
Dry nitro is the same but squirts through one jet just before the throttle body.
Would it be right to suppose that although the dry nitro system seems simpler to plumb in, it has a certain lag in response compared to wet nitro because the NO2 has to travel further each time it's switched on before getting to the cylinder?
So with Kaotik's wet system there are 4 jets changed each time you go for an upgrade in shot size?
Finally, I gotta ask. Why do you need to change the spark plugs for ones that run colder? – I don't really understand what it means because it seems that whilst the nitro is in use the combustion temperature is high. So high that it all reaches melt down in as little as 15 secs.

there r not 4 jets...but yet two jets...one for fuel and one for nitrous....the fuel and nitrous are both plumbed through a shark nozzle which is located in my intake...it is a direct port..i can use this system on the highway it is just limited to 1/4 mi runs because my nitrous would never take remotely close to 13 seconds to release..but that is only if u r runnin a huge shot like 125 n e way

edmund just so you know a dry kit is better for smaller shots and a turbo: rueling::,because the N2O is stored as a highly compressed liquid and when it enters the intake it turns into a gas expanding 100's of times and cools the air to
-176 degrees,in other words the air into the turbo is cool and condensed creating more boost.someone please correct me if i'm off.

Well you asked for it. First off you would NEVER NEVER inject N2O into the turbo, but after the turbo before the intake charge reaches the engine. Next, while yes running a small (25hp max) shot of dry N2O on a forced induct system will bring down the CHArGE temps, it will generate more heat inside the engine than is really desirable, a water/alky injection system or a very good intercooler is a better steup.

Actually, the temps inside the engine go down over all. The exhaust temps rise though because the mix takes so much longer to burn that it's still burning as it is exhausted from the engine. That's how you can burn an exhaust valve by running to much N2O.

The added amount of Oxygen released in the burn inside the cylinder causes cylinder pressure to go way up. Increased pressure, increased fuel, this is a bad time for detonation. That's the reason for colder plugs...

Just FYI, it's not Nitro, it's Nitrous or N2O. Nytro is short for Nitro-methane which is a totally different beast all together.

Just when I though I had it all figured out...
Only 1 fuel injector and 1 NO2 injector? Kaotic?
I assumed the Contour ran multipoint injection and so would have 4 fuel injectors - one firing into each branch of the inlet manifold just before the cylinder head (like on my Mondeo inlet manifold). Therefore assumed the wet NO2 system would have 4 NO2 jets – one fitted beside each fuel injector as suggested by OhSigmaChi.
I wasn't really suggesting that it would 13 seconds for the NO2 to reach the cylinder in a dry NO2 set up – I'm sure any delay compared to the wet set up would be relatively short but perhaps significant during gear changes in ¼ mile situations.
If the shot size 35, 50, 75, 125 etc is related to the size of the NO2 jet (or jets) – then what difference does the jet size make as to how long the NO2 is fed into the cylinder for?
Any ideas on the spark plugs question?

Messages crossed - thanks for the plugs answer