Article C5.1.15

Pop-Off Valve Return Line

Technical Regulations

Article C5.1.15

FIA Source

Pop-Off Valve Return Line

Chapter: C5

In Simple Terms

When a turbocharger's pop-off valve releases excess pressure, any fluid that escapes must be returned through a specific pipe. This return line must be positioned after the compressor gets its air but before the compressor wheel itself, ensuring proper system control and preventing fluid loss.

  • Pop-off valve fluids must be captured and returned through a dedicated return line
  • The return line connects downstream of the compressor inlet (after air enters)
  • The return line must connect upstream of the compressor wheel (before the wheel)
  • This prevents environmental contamination and maintains system efficiency
Official FIA Text

All Pop-Off exit fluids must pass through return line connected downstream of compressor inlet specifications and upstream of compressor wheel.

pop-off valveturbochargerreturn linecompressor inletcompressor wheel
2026 Season Regulations