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This is the Tial Brown Blow-Off Valve Spring, designed for precise boost control and response in high-performance turbo setups. Tial offers multiple spring options, each color-coded by pressure rating, to fine-tune how and when your BOV activates based on your engine's vacuum at idle.
The Brown spring is rated for applications where idle vacuum is approximately -24 inHg, with a corresponding 12 PSI spring pressure. This makes it ideal for builds requiring a stronger spring to prevent premature valve venting while ensuring full boost release under throttle lift.
✅ Spring Color: Brown
✅ Spring Pressure Rating: 12 PSI
✅ Vacuum Reference: -24 inHg at idle
✅ Designed for Tial 50mm blow-off valves
✅ Helps optimize valve actuation timing for your boost level and vacuum conditions
✅ Ideal for retuned or modified turbo setups
If your blow-off valve opens too early, you may need a stiffer spring like this one
If your BOV doesn’t open fully under boost, your current spring may be too stiff
Always match your BOV spring to the engine’s idle vacuum for best results
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