HR ZDX Throttle Body Install 06-11 Civic Si Install Guide

This guide will walk you through the steps to install a ZDX throttle body onto your RBC Intake manifold using the Hybrid Racing ZDX adapter.

Hybrid Racing ZDX throttle body adapter kit with metal flange, bolts, washers, gaskets, and fittings laid out.
Cover photo: Hybrid Racing ZDX adapter kit parts used to mount a ZDX throttle body on the RBC intake manifold.
Difficulty
Moderate
Steps
20
Time required
30 min – 1 hr
Category
Engine

This guide will walk you through the steps to install a ZDX throttle body onto your RBC Intake manifold using the Hybrid Racing ZDX adapter.

Tools

  • 10mm wrench
    Quantity: —
  • needle nose pliers
    Quantity: —
  • 10mm socket
    Quantity: —

01 Using a 10mm wrench, disconnect the negative battery terminal.

Car battery in the engine bay with red positive cover, hold-down clamp, and negative cable attached.
View the battery hold-down and negative terminal area before disconnecting the negative cable.
Hands use a wrench on the negative battery terminal clamp in the engine bay.
Loosen the negative battery terminal with a 10mm wrench to disconnect it.
Car battery in engine bay with red positive cover; negative terminal side and hold-down bolt visible in front.
Locate the battery and negative terminal area before disconnecting with a 10mm wrench.
  1. Using a 10mm wrench, disconnect the negative battery terminal.

02 Start by disconnecting the MAF sensor connector. Push down on the clip and slide off to disconnect.

Hands disconnect the MAF sensor connector on the intake housing, with arrows at the clip and plug.
Push down on the MAF sensor connector clip and slide the plug off to disconnect it from the housing.
Hands disconnect the green MAF sensor connector on the engine air intake housing.
Push down on the green MAF sensor connector clip and slide it off the intake housing to disconnect.
MAF sensor mounted on the black plastic air intake housing in the engine bay.
View of the MAF sensor on the air intake housing after the connector is disconnected and wiring moved aside.
  1. Start by disconnecting the MAF sensor connector. Push down on the clip and slide off to disconnect.
  2. With a pair of needle nose pliers, squeeze the wire harness clip together while also pulling it away from the housing. Move the wiring out of the way.

03 With a 10mm socket, loosen the factory hose clamp on the factory air tube.

Hand turns a 10mm socket on the hose clamp securing the factory air tube at the air box.
Use a 10mm socket to loosen the factory hose clamp on the air tube before sliding the tube off the air box lid.
Hands sliding the factory air intake tube off the air box lid in the engine bay.
Pull the air intake tube back and slide it off the air box lid after loosening the hose clamp.
Hands unhinging the black air box lid in the engine bay with arrows at its six hinges.
Unhinge the air box lid; arrows show the six hinge points to release.
  1. With a 10mm socket, loosen the factory hose clamp on the factory air tube.
  2. Pull the air intake tube back and slide it off of the air box lid.
  3. Unhinge the air box lid. There are six hinges total.

04 Remove the air box lid.

Hand lifts the black air box lid in the engine bay, exposing the air filter below.
Lift and remove the air box lid to access the air filter underneath.
Hand lifting the rectangular air filter from the open air box in the engine bay.
Lift the air filter out of the air box after removing the lid.
Hands grip the black ribbed resonator tube beside the battery in the engine bay.
Disconnect the lower air box section from the resonator tube as shown.
  1. Remove the air box lid.
  2. Remove the air filter.
  3. Disconnect the lower section of the air box from the resonator tube.

05 Remove the lower section of the air box.

Black intake tube with silver clamp open and detached at the throttle body in the engine bay.
Intake tube removed from the throttle body after the clamp is loosened, with the open end visible in the engine bay.
Hands use a ratchet and socket on a bolt beside the black intake tube at the throttle body.
Ratchet loosens the fastener near the intake tube connection on the throttle body for air box removal.
Hands remove the black intake tube from the throttle body after loosening its clamp.
With the clamp loosened, pull the intake tube off the throttle body to free the lower air box section.
  1. Remove the lower section of the air box.
  2. Loosen the intake tube clamp from the throttle body.
  3. Remove the intake tube from the throttle body.

06 Unclamp and remove the valve cover vent tube from the intake tube.

Hand unclamps the valve cover vent tube from the intake tube in the engine bay.
Unclamp and pull the valve cover vent tube free from its connection on the intake tube.
Hands unclamp the valve cover vent tube from the intake tube near the engine bay components.
Unclamp and pull the valve cover vent tube free from the intake tube connection.
  1. Unclamp and remove the valve cover vent tube from the intake tube.

07 Unclamp and remove the air assist valve tube from the intake tube.

Hand unclamping the air assist valve tube from the black ribbed intake tube on the engine.
Unclamp and pull the air assist valve tube free from the intake tube.
Hands unclamp the air assist valve tube fitting on the black ribbed intake tube.
Unclamp and pull the air assist valve tube free from the intake tube.
Hands unclamp and pull the air assist valve tube free from the intake tube on the engine.
Unclamp and remove the air assist valve tube from the intake tube as shown.
  1. Unclamp and remove the air assist valve tube from the intake tube.

08 Remove the 10mm bolt mounting the MAP sensor harness mounting bracket.

Hand uses a ratchet on the 10mm bolt holding the MAP sensor harness bracket on the intake manifold.
Remove the 10mm bolt that mounts the MAP sensor harness bracket on the throttle body area.
Hand loosens the 10mm bolt on the MAP sensor harness mounting bracket beside the throttle body.
Remove the 10mm bolt that mounts the MAP sensor harness bracket next to the blue connector.
  1. Remove the 10mm bolt mounting the MAP sensor harness mounting bracket.

09 Unclamp the MAP sensor wire harness from the bracket and discard the bracket.

Pliers unclamping the MAP sensor wire harness from its bracket on the intake manifold.
Use pliers to unclamp the MAP sensor wire harness from the bracket before discarding the bracket.
Hands use pliers to unclamp the MAP sensor wire harness from the metal bracket on the intake area.
Use pliers to unclamp the MAP sensor wire harness from the bracket before discarding the bracket.
Hand holds the unclamped MAP sensor wire harness bracket beside engine hoses and throttle body area.
See the MAP sensor wire harness unclamped from the bracket, which is held ready to discard.
  1. Unclamp the MAP sensor wire harness from the bracket and discard the bracket.

10 Unplug the throttle body harness plug.

Hand unplugging the throttle body harness plug on the engine near hoses and manifold.
Unplug the throttle body harness plug by releasing the connector as shown in this step.
Black throttle body harness plug unplugged amid engine hoses on the intake area.
View of the unplugged throttle body harness plug among the surrounding hoses and wiring.
  1. Unplug the throttle body harness plug.

11 Unclamp and remove the vacuum hose for the purge control valve solenoid from the throttle body.

Hand and pliers unclamping the purge control valve vacuum hose from the throttle body.
Unclamp and pull the vacuum hose for the purge control valve solenoid off the throttle body.
Hand holds the disconnected vacuum hose away from its port on the throttle body.
Vacuum hose for the purge control valve solenoid unclamped and pulled off the throttle body nipple.
Clamp securing the purge control valve solenoid vacuum hose on the throttle body.
Locate the clamp on the vacuum hose for the purge control valve solenoid at the throttle body to unclamp and remove it.
  1. Unclamp and remove the vacuum hose for the purge control valve solenoid from the throttle body.
  2. Remove the coolant lines from the throttle body.
  3. cautionThere is coolant inside of the lines. Be sure to drain the system before disconnecting, or loop the system.

12 Remove the two 12mm bolts and two 12mm nuts that mount the throttle body to the intake manifold.

Hand turns a socket on a top bolt securing the throttle body to the intake manifold.
Arrows mark the two 12mm bolts and two 12mm nuts mounting the throttle body; remove them as shown.
Hand grips the stock throttle body as it is lifted from the intake manifold in the engine bay.
After removing the mounting bolts and nuts, lift the stock throttle body off the intake manifold; the gasket stays on the throttle body.
Hands use pliers to unclip the harness from the lower bracket on the throttle body at the intake manifold.
Un-clip the harness from the lower bracket on the throttle body after removing the mounting bolts and nuts.
  1. Remove the two 12mm bolts and two 12mm nuts that mount the throttle body to the intake manifold.
  2. Remove the stock throttle body, the gasket will remain attached to the throttle body.
  3. Un-clip the harness from the lower bracket on the throttle body.

13 Next you will need to remove the studs from the throttle body port on the intake manifold.

Two 12mm nuts locked face to face on a stud at the intake manifold throttle body port.
Two 12mm nuts placed face to face on the stud so they lock together for removing it from the throttle body port.
Two 12mm nuts locked face to face on a stud at the throttle body port on the intake manifold.
Nuts placed face to face and tightened together on the stud so the outer nut can turn to remove it.
Hand uses a wrench on locked nuts to extract a stud from the intake manifold throttle body port.
Turn the outer nut to remove the stud from the throttle body port on the intake manifold.
  1. Next you will need to remove the studs from the throttle body port on the intake manifold.
  2. Use the two 12mm nuts that held the throttle body in place and place them face to face, as shown in the picture.
  3. Tighten the two nuts together, this will lock the nuts together.
  4. Turn the outer nut to remove the stud. Repeat for both studs.

14 Prepare the RBC gasket and adapter in the correct orientation to fit on the intake manifold.

Hands hold the Hybrid Racing ZDX adapter with white RBC gasket aligned on its face near the engine bay.
Prepare the RBC gasket and adapter in the correct orientation before mounting them to the intake manifold.
Hands hold the Hybrid Racing ZDX adapter near the RBC intake manifold while a hex key engages a bolt hole.
Note the adapter orientation as a shorter bolt is installed with the hex key to mount it to the intake manifold.
Silver Hybrid Racing ZDX adapter bolted to the RBC intake manifold flange, open bore facing outward.
Adapter mounted on the intake manifold with the shorter bolts; check orientation before fitting the RBC gasket.
  1. Prepare the RBC gasket and adapter in the correct orientation to fit on the intake manifold.
  2. Use the shorter supplied bolts to mount the adapter to the intake manifold.

15 Use the longer bolts that are supplied with the kit with one lock washer per bolt to mount the ZDX throttle body to the…

Hands hold the ZDX throttle body with white adapter gasket near the RBC intake manifold flange.
Prepare the ZDX throttle body with the adapter gasket ready to mount it to the intake manifold using the longer kit bolts.
Hands hold the ZDX throttle body while a longer bolt is started into the Hybrid Racing adapter on the intake.
Start the longer kit bolts with one lock washer each to mount the ZDX throttle body to the adapter.
Silver ZDX throttle body bolted to the adapter on the RBC intake manifold in the engine bay.
ZDX throttle body mounted to the adapter with the longer kit bolts and lock washers.
  1. noteGrab your new ZDX throttle body and prepare it for installation by removing the map sensor from the top port, you will not need this.''''
  2. Use the longer bolts that are supplied with the kit with one lock washer per bolt to mount the ZDX throttle body to the adapter.

16 Plug in the throttle body harness to the new throttle body.

Hand connects the throttle body harness plug to the electrical connector on the new throttle body.
Plug the throttle body harness into the connector on the side of the new throttle body.
Hand plugging the throttle body harness connector into the new throttle body.
Plug the throttle body harness into the electrical connector on the new throttle body.
  1. Plug in the throttle body harness to the new throttle body.

17 Prepare the vacuum fitting for installation on the map sensor port on the ZDX throttle body.

Hands hold a small metal vacuum fitting with O-ring and a flat bracket near the engine bay hoses.
Prepare the vacuum fitting and bracket before placing the fitting into the MAP sensor port on the ZDX throttle body.
Hands hold the vacuum fitting with black O-ring ready for the MAP sensor port on the ZDX throttle body.
Inspect the vacuum fitting and its O-ring before placing it into the MAP sensor port on the ZDX throttle body.
Hand places vacuum fitting into the map sensor port on the ZDX throttle body.
Place the vacuum fitting into the map sensor port on the ZDX throttle body.
  1. Prepare the vacuum fitting for installation on the map sensor port on the ZDX throttle body.
  2. Place the vacuum fitting into the port.

18 Used the supplied bolt to tighten down the bracket for the vacuum fitting.

Hand tightens the supplied bolt securing the vacuum fitting bracket on the throttle body.
Use the supplied bolt to tighten the bracket holding the vacuum fitting on the throttle body.
Hand near the supplied bolt securing the vacuum fitting bracket on the ZDX throttle body.
Look at the supplied bolt tightened down on the bracket for the vacuum fitting on the throttle body.
Hand positions the vacuum hose beside the bracket bolted to the vacuum fitting on the ZDX throttle body.
Supplied bolt holds the vacuum fitting bracket in place on the installed throttle body.
  1. Used the supplied bolt to tighten down the bracket for the vacuum fitting.

19 Install the vacuum hose for the purge control valve solenoid.

Hand securing the vacuum hose with clamp onto the port on the ZDX throttle body.
Install the vacuum hose for the purge control valve solenoid onto the throttle body fitting.
Pliers grip a vacuum hose fitting on the ZDX throttle body at the intake manifold.
Use pliers to install the vacuum hose for the purge control valve solenoid onto the throttle body fitting.
Black vacuum hose connected at the purge control valve solenoid port on the throttle body atop the intake manifold.
Look at the vacuum hose installed for the purge control valve solenoid on the throttle body.
  1. Install the vacuum hose for the purge control valve solenoid.
  2. Optional: Connect the coolant lines for the throttle body back to the ports on the throttle in the orientation as they were removed from the stock throttle body. These are not necessary for function.

20 Now you can install your new intake that will allow for the use of a large bore throttle body.

Black Hybrid Racing intake hose clamped to the silver throttle body on the engine.
New intake installed on the large-bore throttle body, secured with clamps on the Hybrid Racing coupler.
  1. Now you can install your new intake that will allow for the use of a large bore throttle body.
  2. cautionTuning may be required for the car to function properly with the additional airflow created by the larger throttle body. Your intake manifold must be bored 70mm at the throttle body inlet to achieve maximum efficiency out of the throttle body.

Finishing up

Finish by installing your new intake for the large bore throttle body.

Note: Tuning may be required. The intake manifold must be bored 70mm at the throttle body inlet for maximum efficiency.