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Can a Stage 1 Tune Pass the Annual Inspection?

1 Answers

AnastasiaLynn

07/29/25 4:59pm

Car with a Stage 1 tune can pass the annual inspection. Detailed introduction is as follows: Function of Stage 1 Tune: A Stage 1 tune modifies the engine parameters, primarily adjusting the fuel injection volume, ignition timing, and air intake volume. Simply put, it releases the reserved power of the engine, enhancing performance based on the original settings. For Naturally Aspirated Engines: After a Stage 1 tune, the engine power increases by 5-10%. For turbocharged engines, the power increases by about 30%. Compared to naturally aspirated engines, turbocharged engines show more noticeable power improvement after a Stage 1 tune. Disadvantages of Stage 1 Tune: A Stage 1 tune only changes the engine parameters and poses no issues for annual inspections. However, vehicles with a Stage 1 tune may experience some faults under extreme driving conditions, and in severe cases, these faults may be difficult to repair.

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