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I am pretty certain they have a pretty good handle on the operating ranges the equipment works best in.
From speaking with them on the phone the sensor works "best" and " has it's longest life" operated in a 200 degree range from 650f to 850f.
Here is something from the Innovate FAQ
Q: When do I need to make or install a heat sink? A: The Bosch LSU4.2 wide-band O2 sensor (shipped as part of the LM-1 kit) is rated to operate at an exhaust gas temperature of < 1300 degrees (F), and a sensor housing temperature of < 900 degrees (measured at the bung) for maximum accuracy and control. When either of these operating temperature ranges is exceeded, the sensor can no longer be accurately controlled. Further, operating at or over these temperatures for any length of time can significantly reduce the lifetime of the sensor. The LM-1 is designed to display an error message under these conditions (currently 08- Sensor Timing Error) rather than provide inaccurate readings. For some turbo vehicles, rotary engines, and other setups, this error message can be encountered with annoying frequency. 650f to 850f.
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