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Air Intake Modification
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An idea for
increasing the R32 GTSt Skyline's air intake.
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Air Intake Modification
1.
Remove clamps around the flexible section between the airbox
lid and the first plastic air intake tube. This will allow
you to move the airbox lid out of the way. (airbox-4) Remove
the 4 screws holding the airbox to the body. (airbox -1)
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2.
With a file and wire cutters remove the rivets holding the
lower section of the airbox. Care must be take so as not to
break off the extended hold down, ( I broke mine ). I can't
stress how easily it breaks off !
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3.
Cut off a piece of the down tube approximately 10 mm long.
Place in the bottom of the airbox covering the small hole
that led into the lower chamber you just removed. Try and
position it as close to the airbox walls as possible without
over lapping the layered area. Trace the inside of the ring
with a marker or something equivalent. Using a good pair of
wire cutters snip out the inside section of the marked area.
Care needs to be taken so as not to cut outside your marks.
NOTE: When cutting it is a difficult. The plastic is durable
and will crack with too much twisting pressure. Once your
satisfied with the cutting use the round rasp file to shape
the hole to size. Check often so as not to make the hole egg
shaped or too big. You want a snug fit. I cut off another
section @ 200 mm long to also use in the next part. (airbox
2-3).
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4.
Using the 200 mm long section previously cut poke it through
the hole in the airbox as far as possible. Reattach the
airbox into place tightly. Measure the distance from the
bottom of the airbox to the sheet metal. Make sure the
section come in contact with the sheet metal. Using your
marker again roughly mark out a line near the bottom of the
down tube so when cut will lay against the sheet metal flat.
This is important on getting the proper angle and location
cut into the sheet metal. You only have one shot at this so
take your time and trim and file until your satisfied! Mark
around the tubing on the sheet metal to lay out where your
going to drill and cut. Try and get all the way around the
tube!
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5.
Using a 10mm drill bit. Drill a series of holes rather far
inside the marked circle. Remember you marked the outside of
the tube but the marker tip is going to put a larger circle
than will be needed so again care needs to be taken here.
(airbox 5)
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6.
Using the rasp file connect the holes you just drilled,
until the center section comes out. Continue until the tube
fits neatly inside the hole. Remember though that tube will
sit at an angle so care is needed not to file too close
towards either the fender or the engine. Your hole will be
egg shaped so no worries there. Replace the airbox back on
and check your work often. It is up to you but I did it so
when it is totally reassembled the tube is held into place
with good tight friction. That way no additional brackets
need to be installed and the tube has not moved or come out
since. (airbox 5-7).
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7.
Remove the airbox and remove the tube. Reattach the airbox
and measure from the bottom of the airbox through the hold.
You want to make sure the final tube extends well into the
hole about 100mm or so. If too long it will come up against
the inside of the inner fender and splash guard well. Cut
and fit. Trimming may be needed to get the proper length you
wish. If you wish you can add an elbow and another section,
bell and fit to the front of the front spoiler. I did both
but found it did not increase anything but the amount of
dirt and moisture into my K&N filter. Removing the extension
and leaving it only as a straight piece has done me much
better. Again that is totally up to you. (airbox-8).
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And
here it is, the intake. The great thing about this mod is
that it will increase your cars ability to breathe. It is a
cheap mod, and will definately improve your performance.
Unfortunately we did not do a before and after dyno test,
but, it feels like there is more grunt, and it certainly
sounds like it!!!
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