JC SuperFlow Racing

Post-Catalyst O₂ Emulator Euro5 Plus (needs SuperFlow)

Post-Catalyst O₂ Emulator Euro5 Plus (needs SuperFlow)

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Euro 5 / Euro 5+ post-catalyst O₂ emulator, designed for motorcycles with aftermarket exhausts or without a catalytic converter.Works in conjunction with SuperFlow to generate a dynamic and realistic post-cat signal, preventing catalyst-related errors without affecting engine operation.

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Description

Post-Catalyst O₂ Emulator (Euro 5+)

This module is a post-catalyst  oxygen sensor emulator, designed for modern Euro 5 / Euro 5+ ECUs and engineered to operate as part of the Superflow system.

It accurately reproduces the electrical behavior of a healthy catalytic converter, allowing the ECU to validate catalyst efficiency even when:

  • the catalytic converter has been removed,

  • a high-flow / racing catalyst is installed,

  • or exhaust and fueling have been modified.

Unlike basic resistor-based devices or static signal generators, this emulator produces a dynamic and context-aware post-cat lambda signal, closely matching real-world catalyst behavior.

Why Superflow is required

A real catalytic converter does not behave the same during steady cruising, acceleration, or deceleration.
For this reason, the post-cat signal must react subtly and coherently to engine operating conditions.

This emulator relies on Superflow to access real-time ECU data (via OBD/CAN), allowing it to:

  • Slightly adapt post-catalyst behavior during acceleration events

  • Remain stable and damped during fuel cut and deceleration

  • Avoid unrealistic reactions that could trigger ECU correlation checks

  • Maintain a consistent, believable catalyst efficiency model under all conditions

Without this contextual information, a standalone emulator would necessarily behave as a static approximation.
By being managed by Superflow, the post-cat signal remains adaptive, realistic, and ECU-consistent.

Key features:

  • Dynamic post-cat behavior adapted to engine conditions

  • Realistic low-amplitude, slow-response voltage profile

  • No fast oscillation, no pre-cat signal mirroring

  • Prevents P0420 – Catalyst Efficiency Below Threshold

  • Does not interfere with fuel control or closed-loop operation

  • ECU-safe sensor ground reference

  • Fully managed by Superflow for present and future functionality

Architecture:

  • Dedicated microcontroller-based signal generation

  • Real-time supervision and parameter control via Superflow

  • Independent from pre-cat lambda behavior

  • Designed for CAN-based environments and future expansion

Intended use:

  • Off-road / racing applications

  • Development and calibration environments

  • Vehicles modified beyond OEM exhaust configuration

Suitable for all Euro 5+ motorcycles

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