82
OPERATING THE HDGT
Pyrometer Calibration
Determine the best temperatures to set for warning levels to help
prevent engine heat damage.
1. Make sure the vehicle is running at stock horsepower.
• For instructions on checking to see if the HDGT tune is
installed,
(see page 26)
.
• If the tune is installed, it will need to be uninstalled (
see
page 49)
.
.
• A “stock” power level is not the same as uninstalling the tune
and can affect the pyrometer calibration results. Make sure to
completely uninstall the tune
..
2. Put the engine under a 100% work load.
• You want to generate the maximum exhaust gas temperature
(EGT)
possible under stock engine conditions.
• A good way to achieve a 100% work load is:
- Find a steep hill with a long road and a high speed limit.
- Wait for a hot day.
- Set up a heavy load on your vehicle.
- Haul the load to the top of the hill.
3. Check and record the highest temperature measured by the
pyrometer
(while under a 100% work load)
.
• This is the upper limit of the safe temperature for your engine.
• Use this value as the safety defuel and/or warning level.
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