Go Fast Bits SV50 High Flow BOV - Rated at Over 300psi

For good reason - good quality diaphragms are typically constructed from silicone and reinforced with a nomex cloth, and are usually a"rolling" design that allows relatively long piston strokes.

However, this design has its limitations. The most significant being they are only designed to have pressure applied to one side, which is the underside. The nomex reinforcing is on the top of the diaphragm, so that the silicone is blown INTO the cloth. Applying pressure to the cloth side can result in the silicone material de-laminating from the cloth. Secondly, applying pressure to the wrong side of a rolling diaphragm causes the bellow section to collapse on itself. This creases the nomex reinforcing, and also causes friction and wear as the piston starts to move when the pressure changes to vacuum.

BOVs must deal with both pressure and vacuum, combined with the fact that competitors' products use wastegate diaphragms constructed the wrong way around for use in a BOV, meaning a diaphragm is not the ideal solution.

By using a robust and proven piston design, and carefully machined to close tolerances, the SV50 eliminates the diaphragm and the problems associated with them when used in a BOV. This is how the SV50 can be made to withstand such high boost pressures.

SPECIFICATION