DIY How To: Skyline Intake Install
This intake is for the R33 with the RB25DET engine specifically.
Tools Required: Basic Socket Set, Basic Screwdriver Set, Pliers, Knife
The Apexi intake replaces the stock air box and intake to the turbo as well as a few of the other air/vacuum lines.
First step is to remove the stock air box intake.
Remove the two clips attached to the rad support and then the intake should slide off the air box.
Next step is to remove the air box.
Remove these three bolts.
Remove the last bolt holding the air box to the inner fender and remove the connector attached to the mass airflow sensor.
Loosen the hose clamp attaching the mass airflow sensor to the turbo inlet tube.
Next step is to remove the air box.
Remove these three bolts.
Remove the last bolt holding the air box to the inner fender and remove the connector attached to the mass airflow sensor.
Loosen the hose clamp attaching the mass airflow sensor to the turbo inlet tube.
Lift out the air box and the mass airflow sensor.
Remove the upper intake tube by loosening the two hose clamps and lifting out.
Remove the lower intake tube by loosening the two hose clamps and lifting out.
Here we have the air box, mass air flow sensor, and two intake tubes removed.
If you notice that you have some oil in the turbo outlet tube you may have a problem with your turbo. It is recommended to have this checked out by a certified mechanic. With our vehicle we don't have too much to worry about so we will continue on with this install.
You will need to remove the intake tube attached to the turbo inlet. If you are unable to get to the hose clamp screw you may need to remove the turbo outlet. If required, remove these three bolts but be very careful to not strip these holes. These bolts are screwed directly into the aluminum case of the turbo and will be very difficult to repair if they are stripped out.
You should now remove this vacuum hose.
It is much easier to install this intake if you loosen the upper intake manifold by removing these two bolts. Remove the third bolt that supports the solid vacuum tubes as these will need to be removed.
After loosening the hose clamp holding the turbo intake tube to the turbo you will be able to remove the tube and the attached vacuum lines.
The tube removed with the solid vacuum lines attached.
Current view of the engine bay.
Remove the four bolts attaching the mass airflow sensor to the air box. Some air boxes have embedded nuts and some are attached on the inside of the air box, you will have to check on your own air box to determine if you need to use a wrench on the inside of the air box.
Line up the supplied gasket and the mass airflow sensor to the holes on the filter and loosely thread the bolts in.
The filter and mass airflow sensor will need to be supported in the vehicle. Apex-i supplies two brackets in the kit but unfortunately the instructions do not show very well how to properly align them. These brackets will likely need to be bent slightly to line up correctly in the car so leave the bolts loose.
The other bracket.
The filter, mass airflow sensor, and brackets assembled.
Loosely assemble the intake tube. The supplied silicone connectors can be difficult to slide onto the intake but they will fit. The hose clamps and vacuum hoses should be self explanatory where they fit.
Slide the intake tube into position over the turbo inlet and tighten the hose clamp onto the turbo.
Attach the removed vacuum line as shown.
You can now attach the brackets attached to the mass airflow sensor and filter to the car. As explained previously, you may need to slightly bend the brackets to have them fit correctly.
Re-install the lower tube.
Re-install the upper tube.
Make sure you re-attach this vacuum line or you may end up with the engine not running correctly.
The mass airflow sensor connector may be tied to another harness, if so, untie the wire and it should have no problem reaching to the new location.
The supplied vacuum hose is much too long so you will need to trim it so that it does not hit the hood when closed.
After the hose was trimmed to the proper length. Make sure that you do not kink the hose.
The other supplied vacuum hose connects to the bypass valve. Remove the hose connected to the bypass valve and loosen off the other vacuum line to make the next steps easier.
Run the vacuum hose as shown and then re attach the hose attached to the intake.
Do a once over check to ensure that you haven't missed anything, check that all hose clamps are tight and that all wires and vacuum lines are tied off. Your done!
