Is Stage 2 Engine Tuning Illegal?

[VonFaith]

Stage 2 engine tuning is not illegal. Simply put, stage 1, stage 2, and stage 3 tuning refer to ECU programming. Relevant information is as follows: ECU upgrades have the following effects on vehicles: After an ECU upgrade, the quality requirements for gasoline increase. Using low-quality gasoline can damage the vehicle. Temperature requirements also become stricter. With an ECU upgrade, the engine operates at higher frequencies, and without a proper cooling system, the engine's lifespan may be affected. Additionally, 4S shops may refuse warranty services for vehicles with ECU upgrades. ECU Programming: ECU programs are preset by automakers, including parameters such as ignition timing and fuel mixture concentration. Manufacturers consider many factors when designing these programs, such as the climate, fuel quality, road conditions, and increasingly stringent environmental regulations in the sales country. Since many of these factors are uncontrollable, manufacturers often program the ECU conservatively. In simple terms, the manufacturer's ECU programming aims to ensure the vehicle runs longer, more stably, and more fuel-efficiently without adjustments.