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

You getting confused... The nitrous systems have nothing to do directly with how many fuel injectors the engine has, wet or dry.

A regular dry system will have a N2O at or near the TB. Obviously, the closer to the actual port inlet the quicker to respond the better. Fuel is added by using either a vacuum bleeder on the fuel pressure regulator (spikes fuel pressure increasing flow of the stock injectors) or an electronic way to widen the injector pulse width.

A regular wet system will have one fuel nozzle and one N2O nozzle, or perhaps one nozzle for both fuel and N2O, at or near the TB. The same holds true her, the closer to the actual port the better.

A direct port wet system will have a fuel nozzle and a N2O nozzle PER PORT (again, fuel and N2O can be combined into one nozzle per port with some systems). This is the closest you can get to the port for quick respsonse and also the best spray patterns for better combustion without fuel puddling in a curvy intake manifold. It's also quite expensive because you need multiple nozzles, jets, and two distribution blocks from the selenoids.