Deleting the Automatic Stability Control (ASC) throttle body (TB) on an OBD2 BMW M3 is a popular modification among enthusiasts seeking improved throttle response and potential performance gains. This guide explores various ASC TB delete options for the OBD2 M3, outlining procedures and considerations for each method.
Understanding ASC TB Delete Options
There are several approaches to deleting the ASC TB on an OBD2 M3, each with its own set of benefits and drawbacks. These methods range from simple software manipulations to complete hardware removal. A common misconception is the “10-second ASC button hold,” rumored to disable ASC’s throttle intervention while retaining rear brake modulation. However, this method’s effectiveness remains largely unconfirmed.
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Option 3: Internal Butterfly Removal: This clean solution involves removing the butterfly valve from the ASC TB while retaining the housing. This eliminates ASC’s physical interference with airflow.
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Option 4: ASC TB Relocation & Bypass: This method relocates the ASC TB and installs a bypass boot, allowing for unobstructed airflow while keeping the ASC system electrically connected.
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Option 5: ASC TB Removal & Cable Retention: This option removes the ASC TB entirely but leaves the actuator and cable in place. This requires securing the cable and potentially addressing the ASC warning light.
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Option 8: Complete ASC Removal: This comprehensive approach removes all ASC components, including the TB and actuator. This typically requires installing a resistor to prevent warning lights and ensure proper ABS function.
Implementing ASC TB Delete on OBD2 M3
Specific procedures for each option vary in complexity. Options 3 and 4 often involve manipulating the existing ASC TB. Option 5 necessitates removing the TB while leaving the actuator in place. Option 8 requires complete removal of the ASC system and installation of a resistor, often a 10 Ohm resistor with a wattage between 1-15W.
For options involving hardware removal, specific BMW parts (e.g., 13541703588 and 13541740159) are often required to complete the bypass. Refer to reputable sources like RealOEM for accurate part numbers and diagrams.
Considerations for ASC TB Delete
Deleting the ASC system can impact vehicle handling and safety. While removing the ASC TB can improve throttle response and potentially increase horsepower, it also eliminates a safety net designed to prevent loss of control. Drivers should understand the implications before proceeding with any modifications. Retaining the rear brake modulation function of the ASC, if possible, can offer some benefits, particularly in low-traction situations.
Furthermore, some ASC delete options may trigger warning lights or fault codes. Addressing these issues often involves installing resistors or modifying the vehicle’s electrical system.
Conclusion
ASC TB delete on an OBD2 M3 offers potential performance benefits but requires careful consideration of its impact on safety and vehicle dynamics. Choosing the appropriate method depends on individual needs and technical expertise. Always consult reputable sources and exercise caution when modifying vehicle systems.
