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Innovate Motorsports HBX-1 Heat-Sink O2 Sensor Bung Extender (3729)

$116.71

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Innovate Motorsports HBX-1 Heat-Sink O2 Sensor Bung Extender (3729)

$116.71

$116.71

The Innovate Motorsports HBX-1 Heat-Sink Bung Extender (MPN 3729) is a precision-engineered solution for high-exhaust-gas-temperature (EGT) applications that cause wideband O2 sensor failure or timing errors. Specifically designed for turbocharged, rotary, and other high-performance engines, this extender protects sensitive electronics from thermal damage while maintaining accurate air-fuel ratio readings.

Standard Bosch LSU 4.2 and 4.9 sensors are rated for a maximum EGT of 1,700°F (930°C) and a housing temperature of 1,058°F (570°C) at the hex. When these thermal limits are exceeded, Innovate controllers typically display an "08- Sensor Timing Error." The HBX-1 addresses this by relocating the sensor away from the direct high-heat path without sacrificing signal integrity.

  • Thermal Protection: Pulls the sensor 1.1875" (30mm) out of the original weld boss to significantly reduce applied temperatures.
  • Integrated Heat Sink: Features a specialized finned design to dissipate heat away from the sensor housing.
  • Maintains Accuracy: Precision-machined to ensure correct exhaust gas flow to the sensing element for reliable data.
  • Compatibility: Optimized for Bosch LSU 4.2 and LSU 4.9 wideband sensors used in Innovate Motorsports kits.
  • MPN: 3729

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