Filter
Top Products
Activation” LED. Once the engine is warmed up,
push the throttle hard so that the engine gains RPM
quickly (creates boost) and then let it come back to
an idle. During this process, this LED should
become illuminated temporarily. It only comes on
when the pressure transducer in the box reads
boost from the engine.
9.0 ENGINE ADJUSTMENTS
9.1 SUPERCHARGER BELT DRIVE ADJUSTMENT
Start your engine and observe your belt drive. The
belt should line up with itself as it passes between
the two nylon idlers. To put it a different way, the
portion of the belt running up to the supercharger
should lay almost directly over the portion leaving
the supercharger and heading toward the power
steering pulley. If the upward run is more forward or
rearward than the downward run, you need to
move your supercharger slightly forward or back-
ward with respect to the crankshaft pulley. You can
now access the two bolts attaching the supercharg-
er’s bracket to the cylinder head from step 6.1 with
an open-end wrench. Loosen each bolt slightly to
allow for adjustment. Start the engine. You can now
move the supercharger assembly slightly forward or
rearward to correctly align the drive pulleys. The
slots in the Supercharger mounting bracket will
allow you to find the perfect alignment for the belt
run. NOTE: Do not attempt to move the super-
charger with your hands with the engine run-
ning. Use an appropriate tool. The best tool to
use is a flat blade screwdriver placed between the
forward bracket bolt and the front inside edge of the
bracket. Move the supercharger assembly while
watching the belt run the idler pulley. If you have
the two bracket bolts too loose, the supercharger
will be out of alignment from side to side. Make
sure the two bolts are snug enough to just allow
some leveraged movement. Once you have the
belt running true in the center of the idler pulleys,
tighten the rear bolt to secure the position. Shut off
the engine and tighten the other bracket bolt
securely. Recheck all mounting bolts for tightness.
9.2 IDLE ADJUSTMENT:
Restart your engine. Using the idle airscrew on
your throttle body (now on the back of the super-
charger), adjust your idle speed to 950-rpm after
the engine is warm. This can best be approximat-
ed by closing the screw completely (turning clock-
wise) and backing it out one and a half turns
counter-clockwise. Adjust further to reach the
950-rpm value. Next, turn your headlights on
BRIGHT and put your heater fan on HIGH. Leave
the air conditioning off. Rev the engine briskly in
neutral to at least 2500 rpm and release. Notice if
the idle stops at 900 rpm. If it dips below this
level and feels like it will stall, then recovers to
950 rpm, open the idle airscrew (counterclock-
wise rotation) one tenth of a turn at a time until
most of this “droop” disappears. A slight droop of
100 rpm or so is acceptable and normal. More
than that may create a stalling problem during
driving. Turn off the lights and heater fan and
double check that your idle speed is 950 rpm. If
you open the idle screw too much, you will create
too high of an idle speed when the lights and fan
are turned off. You also may possibly introduce a
stumble on part throttle to full throttle accelera-
tions. In addition, a slow return to idle behavior
will occur.
9.3 If you have difficulty stabilizing the drooping
idle problem, adjust your dashpot to help in slow-
ing the throttle’s closing. The factory specification
is that the dashpot tip just begins to touch the
throttle arm at 2500 rpm. Have an assistant hold
the engine at 2500 rpm from the driver’s seat.
Supercharger Installation Instructions
999-156 -14- Revised 1/07