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Whipple Charger Installations Instructions for Mercury 454/502 Magnum Engines
nut after adjustment.
Engines that idle to low:
This means either there's not enough air being fed to engine or not enough timing.
To increase airflow at idle, take the set screw/throttle stop and raise it so when the
throttle is in its relaxed position, it will be slightly open more.
adjustments such as 1/8
after adjustment.
To raise the voltage, you must make the setscrew (acts as throttle stop when in
returned position) open the throttle blade more. This will raise the RPM (if it's
loping between 600-1000, open the blade). If the RPM is to high, you must close
the blade (lower the voltage). If you do have a scanner, watch the IAC count. You
want it to be between 20-50. You must shut the motor off for 5 seconds to reset
the IAC motor. If you do not have a scanner, you can adjust this setscrew until you
see the motor idles around 750 on the tachometer, the motor should not hunt more
than 100 RPM.
Rev engine up past 2500 rpm and bring back at a rapid rate. The motor should not
die, it should come back to the desired idle speed within 1-5 seconds. If it dies,
then it needs more air so follow instructions for engines that idle too low.
Motors that idle high only after revving the engine or there are no more adjustments
to be made:
This means the TPS voltage is slightly off and that it does not return to its "Closed
Loop Idle System." To fix this, you must loosen the TPS sensor (located on port
side of throttle body) and push the top out towards the back of the boat. This will
lower the TPS voltage. Tighten allens and try starting it again. You may want to
use the scanner or a volt-meter (0-5volt sensor output) to watch the voltage come
down. Ideal voltage should be in the range of 0.45 – 0.55 volts.
After installing the Whipple supercharger kit it is imperative that the following checklist be
performed. Failure to perform these simple tests may result in severe engine damage.
1. Make sure 91 octane or higher is in the vessel. If unsure, then drain the tank completely
454/502 MagnumTBI_A1R9
th
turns. NOTE: Don't forget to tighten locking nut
CRITICAL!!!
LAKE TEST
POST-INSTALLATION CHECKLIST
Make small
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