2005 Mustang GT Zex Nitrous
The ZEX nitrous system came with every last part we needed for the installation. The only component I purchased separate was black wire conduit to cover the electrical wires in the engine compartment. This made the installation almost undetectable. The ZEX system is different than most systems on the market. The biggest difference that I really like is what is called the nitrous management unit or NMU. The NMU is a small box that houses the solenoids and electronics. Everything needed to operate the system is in the box so you only have 1 part to mount in the engine compartment.
We started the install in the back of the car and worked our way forward. The bottle was mounted as shown and we did not need to remove the gas tank to mount the brackets. The nitrous feed line was run under the car in the frame rail all the way to the front of the car. Once out of the frame rail you can run the line up the firewall through a small hole located where the fender meets the firewall. This is a perfect location to have the feed line enter the engine compartment.
Zex says this installation takes around 2 hours. We spent about 3.5 hours installing this system but most of the time was determining the best mounting and routing locations. The photo’s at the end of the article will help you greatly as we have already done the work for you so all you have to do is run the lines and mount the NMU. The picture to the left is the NMU mounted near the air filter. If you have the factory air box you will need to find a different location. We felt this location was ideal as it tucks away nicely. Once the NMU was installed we mounted the fuel supply adaptor to the fuel rail. This was another easy task and took only minutes. The Zex piece is very nice and fit perfectly. We then ran electrical wires to the desired locations which again was very straight forward. Zex supplies you with a 12 volt power cord that mounts in the arm rest and plugs into your accessory power supply. This is how the system is powered so there is no need to mount an arming switch. The ground was run to the 10mm screw that fastens down your stock air box or in our case the C&L intake systems heat shield. The final wiring step was to wire in the wide open throttle wire to the TPS. There is no cutting needed so all you do is run the wire over to your TPS sensor and use the supplied connector.
Once you have the entire system mounted the last step is to program the NMU. This is very easy the zex instructions explains this clearly. In short when in the key on position you push a button on the NMU that tells it you are going to give the car WOT or Wide Open Throttle. You hold WOT for 10 seconds and the NMU memorizes the voltage at the throttle position sensor. After the time is expired you simply let off the pedal and the NMU is programmed. The NMU memorized the TPS voltage at WOT and that is your wide open throttle switch. Now the system will only turn on if you are at wide open throttle.
At this point you will be pretty excited because you are really only minutes away from a nitrous run. If you have never been on a nitrous run hang on because you wont wonder if the nitrous worked. It is a gain that will put you back in your seat. You will need to have your bottle filled as they arrive empty. The system is adjustable from 75 to 175 HP. To determine what level of power is best for you we suggest calling us but it is common to run 75 HP on your stock tune with no issues. We have ran the 75 HP system on our most radical naturally aspirated tune with no ill effects. A good rule of thumb is to remove 1 degree of timing for every 25 HP but that is a safety net. Zex says you do not need to do any modifications to timing at the 75 HP level. We have found that some cars at the 100 HP level and all of them at the 125 HP level will melt the spark plugs with a safe tune. We suggest using a colder spark plug and removing timing at anything over 75 HP. Call us for your custom tuning needs with this nitrous system. We can put together a program for you that will be awesome on the street yet safer when you are ready to "SPRAY" at the higher horsepower levels.