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ing from the supercharger at idle. This is normal.
9.9 Performance: You will notice that your engine
runs stronger on cold days than on very hot ones.
This is due to the nature of the internal combustion
engine. When the air is cold, the engine receives a
denser charge of air, thus more power can be pro-
duced. While this is true with any engine, the
supercharger amplifies this cold air benefit.
10.0 LONG TERM MAINTENANCE
10.1 BELTS
The only item to watch with your supercharger kit
will be the belt tension for the supercharger drive.
If you have a tension gauge for a poly-vee belt, the
tension is to be 90 pounds. If you see a large
accumulation of belt dust on your supercharger, it
is an indication that your belt is slipping. A slight
amount of belt dust is normal. CHECKING YOUR
BELT FOR WEAR: As the belt wears, small
cracks will form in each of the ribs on the inside
run of the belt. Replace your belt when you can
count six cracks within in one inch of length (six
cracks total from all ribs combined).
10.2 DRIVEABILITY
If you notice a driveabilty problem as your car
ages, have your fuel pressure checked. Have a
technician install an accurate 0 to100psi fuel
pressure gauge in the fuel line BEFORE it enters
the fuel rail .
10.3 Every six months or so, check your hose
clamps for correct tension. The rubber hoses will
take a set and the clamps may not be holding as
tight. Also check all mounting bolts and nuts, par-
ticularly the throttle cable anchor bracket.
10.4 Your air filter is a long-life unit needing serv-
ice only every 15,000 miles. To clean, you can
wash the filter element in soap and water. Use a
dish detergent soap such as Dawn, etc. Rinse
thoroughly and allow to dry. Wet the filter element
with a light application of ATF (automatic trans-
mission fluid). Alternatively, a special cleaning kit
is available from Jackson Racing (#901-970).
10.5 At every oil change, lubricate the bypass
actuator arm contact point and shaft bushing with
light grease to insure long life - these parts are
exposed to under hood dirt and grime.
TROUBLESHOOTING
SYMPTOM: Engine cranks but will not start
PROBABLE CAUSES: Airflow meter disconnect-
ed; Idle air line open; Low battery voltage
CURE: Double check that seven pin to airflow
meter is well connected. Re-check the 3/4” ICS
line and the PCV line to see that they are not
leaking. Use a known good battery to “jump” the
Miata’s battery. It is possible to have enough volt-
age to crank a Miata but not enough to correctly
run the engine’s control computer.
SYMPTOM: Unstable Idle
PROBABLE CAUSE: Idle air screw set incorrect-
ly; Restrictor left out in step #7.8; Pinched idle air
balance line; air leak in intake track.
CURE: Re-check restrictor. Check idle adjustment
procedure in step 8.1 above. Check the idle air
balance line for restriction or pinching. Check for
air leaks - vacuum at idle should be at least 17.7
in Hg.
11.0 FURTHER MODIFICATIONS
Now that your Miata has a stronger engine, there
are a few changes you might want to make to the
rest of the car to improve its performance. The fol-
lowing are not required for your supercharged
Miata, but are presented as tuning hints for a bet-
ter all-around car.
We recommend that you install a Jackson Racing
Stage 1 clutch when it comes time to put in a new
clutch. While your new supercharger and the stan-
dard Mazda clutch work well together, it is a good
idea to step up to the Jackson Racing unit when
you are changing your clutch.
We recommend you install a set of Jackson
Racing larger diameter anti-roll bars for the sus-
pension for your Miata. These will tighten up your
steering response. We also recommend a new set
of Tokico shock absorbers if your Miata has over
30,000 miles on it. The Tokico shocks coupled
with a set of the Sport lowing springs will lower the
car about 35mm. This combination yields better
handling with out the harsh ride of competition
springs. Have your car aligned afterward (driver’s
equivalent weight in the driver’s seat) to factory
specifications after any suspension changes.
You might want to add a Jackson Racing Boost
Supercharger Installation Instructions
999-156 -16- Revised 1/07