BMW M2 G87 Tuning Guide

BMW M2 G87 Tuning Guide

BMW S58 Tuning Guide

The BMW S58 engine, found in the G87 M2, G80 M3, G82 M4, X4M F98, and X3M F97, represents BMW’s latest generation of high-performance inline-six engines. Offering exceptional power, torque, and tuning potential, the S58 has become a popular choice for enthusiasts looking to maximise performance. Whether you’re looking to purchase one of these vehicles or already own one, this tuning guide will help you navigate the options and considerations when modifying your BMW S58 engine.

Pre-LCI vs. LCI Models: Power Differences

The S58 engine is available in various BMW models, and there are power differences between the Pre-LCI and LCI versions.

  • Pre-LCI Models (2020-2022): These models come with the initial version of the S58 engine. In the G80 M3, G82 M4, and X3M/X4M, the engine produces around 473bhp (480PS) and 600Nm of torque. In the G87 M2, the power output is slightly lower, at approximately 453bhp (460PS) and 550Nm of torque.
  • LCI Models (2023 and onwards): The LCI (Life Cycle Impulse) models received slight updates, including more refined electronics and slightly increased power. The G80 M3 and G82 M4 LCI models see an increase in output, with power rising to around 503bhp (510PS) and torque increasing to 650Nm. The G87 M2 LCI is expected to follow similar trends, with a slight bump in power and torque.

For those looking to tune their vehicle, it’s important to know the baseline power output, as it will help determine the appropriate modifications for achieving the desired performance level.

Considerations Before Tuning: Rear-Wheel Drive vs. All-Wheel Drive

BMW offers both rear-wheel drive (RWD) and all-wheel drive (AWD) configurations in the vehicles equipped with the S58 engine. The drivetrain plays a significant role in how the vehicle responds to tuning, particularly in terms of handling, power delivery, and traction.

  • Rear-Wheel Drive (RWD): Found in the G87 M2, G80 M3, and G82 M4, RWD vehicles offer a more traditional, performance-focused driving experience. Tuning for RWD vehicles is often aimed at maximising power while maintaining a balance between traction and handling. When tuning RWD vehicles, be mindful of increased wheelspin and handling characteristics, especially on higher-powered setups.
  • All-Wheel Drive (AWD): The G80 M3 and G82 M4 are also available with BMW’s xDrive system, while the X3M and X4M are AWD by default. AWD configurations provide more grip, making them better suited for handling increased power from tuning, particularly in wet or low-traction conditions. However, tuning an AWD vehicle may require more attention to drivetrain components like the transfer case and driveshaft to ensure the car can handle the additional power reliably.

It’s crucial to consider your vehicle’s drivetrain when planning tuning modifications. More power can exacerbate issues like traction loss or excessive understeer, so proper tuning must take these factors into account.

ECU Unlocks: What You Need to Know

Tuning the S58 engine to its full potential often involves remapping or reprogramming the ECU (Engine Control Unit). However, recent BMW models, particularly those produced after 2021, feature a more secure ECU that cannot be tuned directly via standard software methods. This is due to updated Bosch ECUs in these vehicles, which require a special unlocking process.

  • ECU Unlocking: To unlock the ECU and gain full access to the tuning capabilities, the ECU must be physically removed from the vehicle and sent to a specialist company. This company will then perform the ECU unlock, allowing for custom tuning and modifications. The process is a more involved and costly option, but it is the only way to achieve truly bespoke tuning for the S58 engine. Do not be fooled by companies saying they can unlock your ECU, at the time of writing there is only 1 company in Finland who can do this, and it does involve shipping your ECU to them.
  • Racechip and Plug & Play Options: If you’re looking for a simpler, less intrusive tuning solution, there are plug-and-play options such as the Racechip that allow you to adjust the engine mapping without the need for ECU removal. These systems are typically easier to install and do not require the car to be sent off for modifications, but they may not offer the same level of fine-tuning or gains in performance as an ECU unlock. Racebox and similar systems are an excellent option for those looking for a less permanent solution or those who don’t want to risk voiding their vehicle’s warranty with ECU removal.

Check out our dedicated RaceChip brand page here.

Common Tuning Modifications for the S58

Once you have unlocked the ECU or opted for a plug-and-play tuning system, there are several key modifications you can make to extract more power from your S58 engine:

  • Stage 1 Tuning: Stage 1 typically involves remapping the ECU for higher boost levels and optimised air-fuel ratios. This is the most basic form of tuning and can increase power by 50-100bhp, depending on the vehicle and modifications. It’s generally safe for stock components and doesn’t require additional parts like intercoolers or exhaust systems.
  • Stage 2 Tuning: Stage 2 tuning usually includes the addition of supporting hardware, such as a high-flow intake, a larger intercooler, and a performance exhaust system. These modifications allow the S58 to breathe more easily, enabling further increases in power. Stage 2 tunes often result in gains of 100-150bhp, depending on the modifications.
  • Stage 3 Tuning: Stage 3 represents a full performance build, often including turbo upgrades, strengthened internals, and an extensive cooling setup. Stage 3 tuning can push the S58 engine to its absolute limits, with power gains exceeding 200bhp. This level of tuning is more suitable for track-focused builds or those looking for maximum performance but requires careful consideration of drivetrain upgrades to handle the additional stress.

Key Components to Consider When Tuning

When tuning the S58 engine, it’s not just about increasing power; you also need to ensure that the vehicle’s key components can handle the additional performance. Here are the most critical parts to consider upgrading:

  • Cooling System: More power means more heat, so upgrading the intercooler, radiator, and oil cooler is essential for maintaining engine temperatures under heavy load.
  • Fuel System: Upgrading fuel injectors or fuel pumps may be necessary for higher-power tunes to ensure the engine receives sufficient fuel flow.
  • Drivetrain: If you’re pushing significant power, especially on an AWD vehicle, you may need to upgrade the transmission, differential, or driveshafts to prevent premature wear or failure.
  • Brakes: With more power comes the need for more stopping power. Larger brake discs and high-performance pads are recommended to ensure that the vehicle can safely handle the extra speed and power.

You can check out our car specific pages for all available tuning parts below:

Conclusion

Tuning the BMW S58 engine offers immense potential for improving performance, whether you drive a G87 M2, G80 M3, G82 M4, X3M F97, or X4M F98. Whether you opt for a simple plug-and-play tuning system or go all out with ECU unlocking and Stage 3 modifications, it's important to consider your vehicle's drivetrain, as well as the supporting components required for safe and reliable performance.

While the process of tuning may seem daunting, it’s a rewarding experience for those who seek to unleash the full potential of the S58 engine. As always, ensure you work with reputable tuning specialists and carefully consider the long-term impacts of your modifications on your vehicle’s performance and reliability.

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