Selling my K1ANO relief valve.Will run up to 18psi and unlike bleed valves there is no leak or spiking. This is very easy to set up and will come with instructions.Should be suitable for most turbo cars. £15 delivered.
http://www.k1ano.co.uk/images/jpegs/relief_valve.jpg
A bleed valve – as the name suggests, bleeds air from the waste-gate actuator fooling it into thinking there is lower boost than there actually is. This doesn’t change the way the waste-gate actuator works so the waste-gate still begins to open early meaning that although the boost level is higher, as defined by the amount bleed dialled into the bleed valve, spool time is not as quick as a relief valve
What is a relief valve ?
A relief valve is a small device which essentially acts as a mechanical air pressure switch. A small ball bearing within the relief valve is held, under pressure, onto a seat by a spring. Air pressure acting on the ball causes it to lift off its seat once a preset pressure has been reached, as determined by the spring pressure on the ball – which can be adjusted of course. Once the ball has lifted off its seat air can flow through the valve. As the air pressure acting on the ball reduces below the spring pressure, the valve closes preventing air flowing through the relief valve. In essence no air passes through the valve until the spring or ‘cracking’ pressure has been reached.http://www.k1ano.co.uk/images/jpegs/relief_valve.jpg
How does this work on a turbocharged car ?
If the relief valve is placed in the turbo to waste-gate actuator pipe it acts as a boost controller. The relief valve can be adjusted to give the desired boost pressure by simply adjusting the spring pressure. This is done by lengthening (lower the boost) or shortening (increasing the boost) the relief valve. One of the excellent characteristics of a relief valve is the way the boost is controlled. Due to the way the relief valve ‘cracks’ open once the spring pressure has been reached – no air is acting on the waste-gate actuator until this time. This means that the boost is much more aggressive and rises much more quickly than a turbo car without a relief valve. This is because normally a waste-gate actuator actually starts to open the waste-gate at very low boost levels, gradually opening wider as boost rises until it is fully open – at which point maximum boost has been reached. This has the effect of smoothing the boost all the way until maximum boost is reached. Since a relief valve prevents air getting to the wast-gate until the preset boost level is reached maximum boost is reached more quickly making for a more exciting launch.Is this better than a bleed valve ?
You bet !A bleed valve – as the name suggests, bleeds air from the waste-gate actuator fooling it into thinking there is lower boost than there actually is. This doesn’t change the way the waste-gate actuator works so the waste-gate still begins to open early meaning that although the boost level is higher, as defined by the amount bleed dialled into the bleed valve, spool time is not as quick as a relief valve