TiAL Sport Replacement Spring Brown 12PSI | 003907

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.

Key Features:

• ✅ 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

When to Use:

• 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