Tunerzine Project Honda Fit Part 7 Zex Nitrous
Our VIP Honda Fit project gets fitted with Zex Nitrous Kit
Posted:  Sep 15, 2008
Type:  Feature Tech, Honda, Fit
Rating:  100%      0    0
Comments:  0
Rate this article
  
Share   
      
Send to Friend

As we come to an end with out Project Honda Fit, we looked for a quick and safe way to gain some extra horsepower to our project. After doing some research and considering the supercharger from Jackson Racing, we decided a nitrous kit from Zex would be a better "fit" to our project. Nitrous installs are one of the most common applications for a quick gain in horsepower and given that many Fit owners are on a budget we believed that the Zex nitrous kit would be more beneficial to our readers.

Take a look at our in depth step by step photos and install details as we set our Fit up for some extra horsepower at a push of a button! Many thanks to Zex for sponsoring our Honda Fit. For more information on Zex Nitrous Kits, visit their website.


1 We start by laying out the kit and making sure we have all the parts necessary to start our install.

2 A shot of our Fit engine bay minus the Nitrous

3 First we need to remove the filter, using a philips screw driver we remove the clamp holding our intake to the throttle body and the air breather

4 Locate a spot where you would like to install the Zex Nitrous Management Unit. We chose to attach it to the plastic battery shield.




5 Use the supplied tapping screws, to attach the unit in place.


6 Once we have the unit safely mounted we attach the fittings to both nitrous in and fuel in connections on the management unit


7 Connect the long hose assembly to the nitrous in connection


8 We routed our nitrous hose under the car. Make sure to use supplied zip tie's to keep everything nice and secure and away from moving parts that can damage the hose.




9 We found a whole with a rubber stopper that allowed us to snake the hose through to our trunk area. No drilling required!


10 Next we locate a spot in the trunk where we want to mount the bottle.


11 Drill and attach brackets with tapping screws.


12 Here's our bottle mounted and ready to go




13 Attach the hose assemble from step 8


14 Next we move on to the fuel supply, locate the stock fuel hose which connects to the fuel rail. This will be located right under the throttle body. The fuel connector uses a clip which easily disconnects, make sure to have a rags handy to catch spill from excess fuel


15 Zex provides all connections to make our adapter which will make it a snap tapping into the fuel system without cutting any stock fuel lines.


16 Using the the quick connects and adapters we put together our adapter.




17 To demonstrate the connection on the right we have a stock fuel hose to show how the connection goes together.


18 Back into the engine bay we connect the hose which will supply fuel to the managment system


19 Connect the hose from the where we tapped into the fuel line to the back of the management system to the fuel out connector.


20 Next snap the stock fuel hose into our adapter piece




21 For our Jets, we decide on a conservative 45hp Shot, so were using a 17 jet for our fuel and 28 for nitrous, for a proper mix.


22 Attach both fuel supply and nitrous supply hose form the management unit to the zex Nozzle


23 Now lets move on to the electrical side of the install.. We will need to locate a throttle signal for our management unit.. On the fit there will be a large connector that attaches to the throttle body. Withing that harness we will need to tap into the red wire (first one on the connector)


24 Throttle-by-wire systems are VERY sensitive to any load on the TPS signal line, so Zex supplies us with a resistor that isolates the Nitrous Management Unit further so there are no issues with check engine lights, etc.




25 Using the supplied electrical connectors we make our adapter that containts the resistor in line.


26 plug the connector into the red wire on the connector that we located in step 23


27 Wiring from the management unit. white - TPS signal, black - ground, red - power connected to switch.


28 next we will need to ground the system, we found a great spot on the driver side frame rail




29 With our power switch we router the wire next to the firewall all the way to the passenger side where we were able to snake it through a wire grommet.


30 Zex supplies all the wiring and necessary switch to install inside the cabin


31 Now that all connections are done, double check to make sure everything connected properly. We install our intake back in reverse order.


32 A shot of the zex nitrous system installed.




33 Now that you have completed the nitrous install, the next step is to program the Activation Switch. (Please follow included install manual for more information on this process)


34 We have the green light indicating that the system is ready to go!


35 But before we go and run our system, we install a set of colder zex spark plugs.


36 A comparison of stock and zex's colder plugs.




37 Once everything is connected up, we head over to Velocity Trends for dyno runs. Make sure to fill up with high octain fuel and Top off the nitrous and your ready to roll.


38 Here's our dyno run, and after couple runs we netted a solid 33hp gain at the wheels on a 45hp shot! Just be careful, Nitrous can be addicting




 

BROWSE MAKES AND MODELS
BMW    Subaru    Chevrolet    Acura    Mercedes-Benz    Infiniti    Mazda    Pontiac    Honda    Porsche    Ford    Nissan    Kia    Volvo    Mitsubishi    MINI    Audi    Saturn    Scion    Datsun    Volkswagen    Lexus    Toyota    xA    Bug    M    xB    IS    A4    323    G8    NX    CLS-Class    CL-Class    Ion    SC    Fit    RX-7    S4    Legacy    Rondo    Mustang    Z4    CL    Corolla    350Z    MX-5 Miata    Integra    RSX    Golf    Eclipse    X3    Galant    S2000    Supra    Prelude    TSX    Focus    7-Series    G35    A3    Civic    Impreza    Cobalt    S40    Protege5    3-Series    GTR    5-Series    Lancer Evolution    tC    Skyline    Insight    M3    M6    TT    Solstice    Silvia S15    MR2    Tundra    Sentra    GTI    NSX    Accord    Beetle    Z4 M    240Z    GT    Mirage    240SX    911    Jetta    Celica    GS    Cayman    xD    Cooper   
Meet new friends from itsmyHonda Community!
Name: Gaby Fernandez
Gender: Male
Age: 21
Location: Miami FL
Member Since: Sep 14, 2007
Name: ryan ledan
Gender: Male
Age: 22
Location: bethel CT
Member Since: Jan 15, 2008
Name: PRELUDE VTEC master
Gender: Male
Age: 19
Location: tbilisi GA
Member Since: Jun 27, 2008
GALLERY
WE RECOMMEND
Part 4 shows off the key parts for any build: suspension, wheels and tires
We install a set of Skunk2 Pro-C Coilovers on our project car and put them to the test
We start off our newest project car by swapping out the front end
Our new Porsche Cayman S project gets mounted with a set of DPE wheels wrapped with Nitto Invo's
COMMENTS
Post a comment
Join TunerZine today! to leave a comment.  Click to join now!