Bully Dog GM DURAMAX 6.6L 2001-2006, Installation Manual, Page: 9 / 24

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INSTALLING THE PYROMETER:
In this installation section you
will tap and mount the pyrom-
eter probe into the exhaust
either pre-turbo or post turbo
and then connect the end of
the pyrometer to the OutLook
Main Harness. Doing so will
allow you to monitor Exhaust
Gas Temperatures which is
a very important diagnostic
measure. Exhaust Gas Tem-
peratures indicate how hot the motor is getting and can be used to set safety defueling
parameters (see operating instructions “Set Pyrometer Defuel Level”).
Post Turbo vs. Pre-turbo: You may decide between mounting the pyro either post turbo
or pre-turbo. The diff erence in location determines what temperatures will read on your
OutLook. Pre-turbo mounting is recommended on the GM Duramax because it is easy to
install and provides accurate, safe readings.
The option does exist to mount both a Pre-turbo and a Post-turbo pyrometer probe. It is recommended
that two pyrometers be used if a vehicle is running more that 50 horsepower over stock. On the OutLook
display screen Pyro 1 temps are constantly shown in the bottom left quadrant (If you mount pyro 1 in a
post turbo location, the numbers in that quadrant will represent post turbo).
Whether you mount post turbo or pre-turbo you need to monitor your temperatures; know what is
safe and when to back off . Use the pyrometer calibration procedure below to fi gure out what your
safety limits are.
PYROMETER CALIBRATION PROCEDURE: BEFORE THIS STEP CAN BE COMPLETED
COMPLETELY INSTALL THE OUTLOOK AND ALL OF ITS COMPONENTS.
1. Vehicle must be set to STOCK HP/TQ levels-meaning no HP/TQ modifi cations of any kind (down-
loader or plug-in modules).
2. Engine must be put under full load for as long as possible on the hottest day possible. Pull a hill
or pull a trailer.
3. During a heavy load pull, record the highest reading.
4. Take that reading and add 150 degrees to the high number and that will be your new defuel
number that you do not want to exceed.