BMW M4 G83 preparation: Eventuri intake and BMW Soft CSL

Preparing the BMW M4 G83 Convertible makes it possible to partially compensate for the extra weight specific to the Convertible version by improving engine responsiveness, for more mid-range power and an overall feeling of acceleration. Beyond the numbers, these modifications also enhance the sound experience.

The BMW M4 G83 preparation meets several objectives:

• Optimise an already high-performance base

• Improve the sound of a vehicle fitted with particulate filters

• Get closer to the performance of a CSL version

• Enhance the value of the vehicle while maintaining mechanical reliability

Rather than taking a radical approach, this preparation is based on a gradual and balanced technical evolution that respects the German manufacturer's tolerances.

Design of the Eventuri M4 intake

TheEventuri M4 intake is designed in carbon and is based on a principle of optimised flow to the turbochargers. It comprises :

• Geometric carbon ducts specially developed by the brand

• High-performance filters

• Specific connections for S58 turbos

• A larger intake diameter

Beyond the aesthetic aspect, the aim is to increase the volume of air available at high revs, stabilise intake pressure and enable the turbochargers to work with less stress.

Test bench results: real figures

Before any work was carried out, the M4 G83 was put through its paces on the power bench.

The observed gain is consistent with the values announced by the manufacturer, i.e. around 13 to 15 bhp. The increase in torque remains moderate but measurable. This stage alone already brings the M4 G83 closer to the official values of an M4 CSL.

What is CSL software?

The CSL software consists of installing the original BMW software from the M4 CSL. This is not a modified custom map, but a manufacturer's software applied to the M4 G83.

The modules concerned are :

• Engine management

• Gearbox management

• Differential management

No ECU disassembly or external unlocking is required.

Difference between soft CSL and reprogramming BMW M4 G83

The distinction between Soft CSL and BMW M4 G83 reprogramming is essential.

The CSL software is an intermediate solution for those who wish to remain within an OEM logic.

After installing the admission and implementing the CSL software, the final configuration is displayed:

The curves remain close to the original in terms of linearity, but with adjusted limiters and a fuller operating range.

The feeling of thrust is enhanced without a sudden break in character. This configuration makes for a more expressive M4 G83 convertible, while retaining overall mechanical coherence.

The configuration presented here represents a measured evolution. However, a BMW M4 G83 preparation can go even further:

• Installation of a complete exhaust system

• Further optimisation of the S58 engine

• Customised electronics development

• Integration of additional carbon parts

Each project must be defined according to the vehicle's use and the owner's expectations.

What is the difference between Soft CSL and BMW M4 G83 reprogramming?

Soft CSL uses original BMW software, whereas engine reprogramming directly modifies the ECU's internal mapping for greater gains.

Does the Eventuri M4 intake really add horsepower?

Yes, dyno measurements show a gain of around 15 bhp with this configuration.

Can a BMW M4 G83 Convertible be prepared as a coupé?

Yes, the S58 engine remains identical. The differences mainly concern weight and structural rigidity.

Is the S58 engine reliable after preparation?

When carried out within a controlled and measured framework, a preparation remains consistent with the architecture of the engine.