Filter
Top Products
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 Install the new 4-rib drive belt. This new belt will
run counter-clockwise from the crankshaft, around
the air conditioning compressor, up to the power
steering pump, over to the right nylon idler pulley,
up and over the supercharger pulley, just under the
left nylon idler pulley, and back down to the crank-
shaft. Figure 8.1 shows the belt run for configura-
tions A-D listed below. If you find the belt to fit too
tightly, gently rock the car in fourth gear while
pressing the belt onto the pulley using the following
trick. Put the belt on all pulleys EXCEPT the super-
charger pulley, which you should leave for last.
Feed the belt onto the supercharger pulley in a
COUNTERCLOCKWISE direction; place the car in
fourth gear with the handbrake off (and the ignition
keys OUT!). Gently roll the car backwards with your
body weight while insuring that the belt feeds itself
onto the supercharger pulley the last little bit. Watch
out for your fingers. Make sure the belt does not roll
off of either inside idler pulley while it feeds onto the
supercharger pulley.
UNDER NO CIRCUMSTANCES SHOULD YOU
USE THE ENGINE STARTER TO “BUMP’ THE
BELT ONTO THE SUPERCHARGER. DOING SO
PUTS A HIGH LOAD ON THE SUPERCHARGER
BEARING AND WILL VOID YOUR WARRANTY.
ALSO, IT IS VERY DANGEROUS.
Loosen the pinch bolts on your relocated power
steering adjustment assembly (12mm head on pil-
low block pinch bolt, 14mm head on lower front
bolt). Tighten the long bolt “D” per figure 3.4 to
achieve correct belt tension. The longest run of the
belt should not deflect more than 1/2” when
pressed down with around 22 pounds of thumb
pressure. The tension specification is 90 pounds.
An easy check for proper belt tension is done by
listening to your belts during warm up. If turning the
steering wheel with the air conditioning creates a
squeal, then the tension is too loose. In general,
only a slight amount of black dust should appear
around the supercharger nose when the tension is
correct. Heavy dusting indicates excessive belt
wear from a loose belt. Check your tension again
999-156 -12- Revised 1/07
Supercharger Installation Instructions