The difference between stage 1, stage 2 and stage 3

Topics related to the preparation stages

Understanding the difference between stage 1, stage 2 and stage 3 means looking at the concrete work behind each level. Here are the workshop pages that explain these topics in detail.

Stage 1: remapping only

Stage 1 is the most accessible level of preparation: it relies solely on remapping the control unit, with no mechanical change to the engine. The tables that manage injection, ignition and, on a turbocharged engine, boost pressure are reworked, while every original part is kept. It is the logical entry point for anyone who wants to change how their car behaves while staying on unchanged hardware.

Because it does not touch the mechanics, a stage 1 mainly calls for rigour in the tuning. A prior electronic diagnostic checks that the engine and its sensors are in good condition before working on the control unit, so we work on a sound and known basis.

Stage 2: remapping and hardware modifications

Stage 2 goes further than simple remapping: it combines work on the control unit with so-called bolt-on hardware modifications, that is, parts that fit without opening the engine. A direct intake and a sport exhaust line are frequently found here, improving air intake and exhaust flow. The map is then reworked to account for these new elements and keep a coherent operation.

The essential difference between a stage 1 and a stage 2 therefore lies in this hardware dimension. Where stage 1 stays purely software, stage 2 implies a parts-plus-tuning set thought of as a whole, each modification calling for an adaptation of the map.

Stage 3: a deeper engine preparation

Stage 3 corresponds to the most advanced level of preparation. It involves deeper mechanical work, which may affect the forced induction or internal engine parts, and comes with a fully rethought map. At this point, preparation is no longer limited to the engine: the transmission, braking and chassis must follow to stay coherent with the car's new behaviour.

It is also the level where the bespoke logic makes the most sense. A stage 3 is not just about stacking parts: it requires defining a precise use, road or track, and tuning everything accordingly. The difference between stage 1, stage 2 and stage 3 finally reads as a rise in the depth of modifications and in tuning demands.

Our approach: a bespoke map rather than a generic stage

At Bernis Factory, we do not think in ready-made stage 1, stage 2 or stage 3 packs. Our engine and gearbox mapping is done bespoke by an engine engineer, who tunes each car case by case rather than applying a generic map. The stage labels remain useful to situate the level of a preparation, but they do not replace a study specific to your vehicle and its use.

This approach lets us start from how the car is actually used — road, track or both — to decide which modifications make sense. Rather than aiming for a label, the goal is behaviour that is coherent and faithful to the way the owner really uses their sports car.

Preparation stages and track days at the Paul Ricard circuit

Preparation stages take on particular meaning around the track. Our workshop is located 700 metres from the Paul Ricard circuit at Le Castelet, which lets us support owners before, during and after a track day. We are an official BMW M France partner for track support and recommended by ORECA, and our team has a recovery truck to step in directly on site.

Learn more about the Paul Ricard circuit

Understanding the stages in Signes and around Le Castelet

Bernis Factory is located at 26 Allée de Dublin in Signes, in the Var. This closeness to the Paul Ricard circuit shapes our business: maintenance, preparation and restoration of high-end sports cars meet here every day. To understand concretely the difference between a stage 1, a stage 2 and a stage 3 on your car, the simplest step is to talk it through with a workshop able to tune each engine individually.

Frequently asked questions about the differences between stages

What is the difference between a stage 1 and a stage 2?

A stage 1 relies solely on remapping the control unit, with no mechanical modification. A stage 2 adds hardware parts, such as a direct intake or a sport exhaust line, and the map is reworked to account for them.

What does a stage 3 bring compared with a stage 2?

Stage 3 involves deeper mechanical modifications, which may affect the forced induction or internal engine parts, with a fully rethought map. The transmission, braking and chassis usually have to follow to stay coherent.

Does a stage 1 require a prior diagnostic?

Yes, it is a logical step. An electronic diagnostic checks the state of the engine and its sensors before working on the control unit, so we work on a sound basis.

Do you offer stage 1, stage 2 and stage 3 packs?

We do not think in ready-made packs. Our mapping is done bespoke by an engine engineer, who tunes each car case by case according to its use. The stage labels serve as a reference, not a catalogue.

Do you give a price for a preparation by stage?

Every preparation depends on the vehicle, its condition and the intended use. For an estimate suited to your car, the simplest step is to contact us directly so we can study your project together.