Audi TT Valve Spring Tuning Kit by Forge Motorsport
Now you can fine tune your Blow Off/Diverter Valve to the exact needs of your engine with this complete tuning kit. In your valve tuning kit you will find four springs. We normally supply our valves, unless requested differently, with a spring that will match the tension of the manufacturer’s original fitment valve. However, as many owners undertake tuning modifications some may wish to re-tune the valve characteristics to suit a given application.
If you are finding that the valve is dumping more than required or you are loosing boost pressure, it is normally an indication that a stronger spring is required. Conversely, if the valve is failing to dump it may be necessary to install a weaker spring. For example, if during the tuning of your valve, you are faced with the red spring being too strong and the blue spring too weak, you can add the spacers/shims to the blue spring to increase the tension by small increments, thus achieving a setting between the red and blue springs.
Fitting a stronger spring into a valve will not increase boost pressure unless existing pressure is being lost. Failure to allow the valve to operate by installing a spring which is too strong, may cause damage to the turbocharger.
The four springs are color coded as such,
Green: 5-15 psi
Yellow: 15-23 psi
Blue: 23-30 psi
Red: 30+ psi