7.6 Install the air filter element over the air filter
base. Next, collect the two studs and install them
with the element in place. Install the waffle-pat-
terned air filter cap and secure using the nuts pro-
vided. Use the tie-wraps provided to secure all
components and keep them clear from the belt
runs, exhaust manifolds, and especially the throttle
cable. Reroute the air bag harness over the air fil-
ter, keeping it away from the headlight raising
motor. IMPORTANT! Secure the air bag harness
with tie wraps to keep it from falling into the engine
belt system or being pinched in any way.
7.7 Take the throttle body wiring harness extension
as left in step #2.6 and route the body of the har-
ness along the firewall using the bright cad plated
firewall clips that originally held the throttle cable on
your stock Miata. Tie-wrap the extension harness
along the firewall in at least two places. Make sure
to leave enough slack on both ends to allow the
engine to rock side to side without pulling on the
harness. Contain any extra length in a neat fashion.
Connect the female end to the throttle body at the
throttle position sensor.
7.8 Find the internal restrictor taken out of your
PCV hose in step #1.4. Locate the 3/8” internal
diameter rubber hose from your kit and press the
restrictor into this hose at least one inch. Attach this
hose from the ‘medium’ size fitting on the plastic
intake elbow (near the throttle body, pointing to the
engine). Cut to length and attach the other end to
the camshaft cover fitting on the exhaust side.
Make sure the hose does not kink at any point and
that the restrictor is not left out. If you leave the
small restrictor out, the engine will not idle correctly.
7.9 Locate the 5/32” internal diameter idle balance
hose and attach it to the ‘small’ fitting on the plastic
elbow. Attach the other end to the unused vertical
vacuum nipple on the bypass block of the super-
charger. Cut the line to the proper length, leaving
some slack to allow for engine movement. Make
sure the line is not pinched in any way and that it
has no possibility of interfering with the throttle
cable or spool. Use tie wraps as necessary to
secure the line. The diagram in figure #7.5 shows
the bypass actuator signal line being attached to
the engine side nipple on the bypass manifold. It
may be connected to the fender side nipple –either
is acceptable. Connect your idle balance line to
whichever vertical nipple is unused. The bypass
actuator may have two nipples on its “can”. The
upper one is used in this kit. The lower nipple
should be left open - it is used in the GM factory
installations.
7.10 Reconnect the 7 pin electrical connector to the
air flow meter. Make sure the harness is not
pinched at any point.
8.0 FINAL ASSEMBLY
8.1 Route the drive belt around the crank pulley,
over to the air conditioning compressor pulley (if
present, if not, route to the P/S pulley), up to the
power steering pump pulley, between the idler and
tensioner pulleys, over the supercharger pulley,
down between the idler and tensioner pulleys and
back to the crank. On some applications the belt
may have to be rolled on. If you find this to be the
case, install the belt on all the pulleys except for the
supercharger. Use an 18mm socket to turn the
supercharger pulley clockwise while guiding the belt
onto the pulley. Make sure the belt doesn’t come off
either of the idler pulleys. Do not use the engine’s
starter motor to roll the belt on. Tension the belt
using a 17mm socket on the tensioner bolt. Tighten
the bolt until there is 1/2" of deflection when you
press firmly on the belt between the idler and the
crank pulleys. Thread the jam nut on the tensioner
bolt down against the tensioner bracket. Use a
17mm combination wrench to lock the jam nut into
place. Torque the tensioner pulley bolt to 36 ft-lbs.
Also double check the torque on the fixed idler pul-
ley bolt. If you hear belt squeal with the air condi-
tioning on or when you turn the steering wheel, the
belt is not tight enough. Check the belt tension
again after 500 miles. Illustration 8.1
999-156, 999-157, 999-158 & 999-159
-12-
Revised 06/08
Supercharger Installation Instructions
