Banks Power Chevy_GMC Trucks: Duramax LB7 (Diesel ’01 - 04 6.6L) Tuner- Six-Gun Diesel Tuner with optional Speed-Loader Module '01-04 For use with Six-Gun Switch - Manual (Page 19)

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Section 6
CHECKING ENGINE PERFORMANCE
When the vehicle engine is cold, the
Six-Gun module initiates an internal
warm up sequence that takes about
60-seconds to complete. During this
60-seconds, you will not see any
performance gains to your vehicle.
Go over the entire installation as a
precautionary check to ensure that all
clamps are tight, wiring and hoses are
properly routed, and connections are
tight.
Observe the operation of the boost
and pyrometer gauges (if equipped)
while driving under varying conditions.
Turbocharger boost pressure will
increase as a function of load and
engine RPM; thus the engine will
produce little boost while cruising at
light throttle, with maximum boost
while climbing hills heavily loaded
during acceleration. Note the boost
level seen during hard acceleration
with a given load. If performance
seems to have deteriorated sometime
in the future, the maximum boost
figures may be compared to see if
boost has dropped off. Lower boost
may be caused by turbo ducting leaks,
a malfunctioning wastegate or dirty air
filter. Typical maximum boost pressure
settings for the GM Duramax diesel
will vary considerably with manual
transmission or automatic
transmission options, year model of
vehicle and altitude.
Use your pyrometer gauge to monitor
exhaust gas temperature (EGT) in the
engine. At idle, exhaust gas
temperature will be very low, perhaps
only 300°F. As the engine is
accelerated for higher speeds with
greater loads, the EGT will rise. The
highest EGT will be seen under
maximum load at full throttle, such as
climbing a steep grade with a heavily
laden vehicle. Your pyrometer is color
coded to assist in your reading of the
gauge. The red zone indicates a
dangerous level of temperature. Your
engine should not operate in this
range for more than a few seconds.
The blue zone indicates when it is safe
to shut the engine off. To avoid heat
damage to various engine components
it is recommended that the exhaust
gases cool below 400º before the
engine is shut down.
Your Six-Gun with Speed-Loader is
calibrated to maintain a maximum EGT
of 1400°F. You may experience brief
excursions slightly above 1400°F under
acceleration. If you find that EGT
remains high for any length of time,
check for boost leaks or a dirty air
filter.
-END, SECTION 6-