VAG TFSI and PSA THP blowoff valves, side by side. Both produced by Pierburg
A few years ago we tried and successfully installed a VAG blowoff valve in place of the stock one on the Peugeot 207 GT/GTI/RC 1.6T. Both valves are made by Pierburg. They are electrically compatible but the VAG bov has a better coil and better overall build which allows it to withstand more boost without issues. Although there have been newer revisions of the valves since then, the modifications is still worth doing today!
To fit it you need to make sure the new bov fits onto the turbo mechanically. That is easy, following the instructions below. Then you need to install the right electric connector onto the car’s harness, to power up the bov.
Necessary plug to fit the vag-bov-plug
This was the stock blowoff valve used by PSA group and Mini on 1.6 THP/N14 Prince engines. Since then it has received a couple of revisions, but they are compatible with this mod.
Peugeot/Citroen/Mini 1.6T blowoff valve – first edition
This is the VAG blowoff valve connectors that are needed:
VAG blowoff valve – first revision
Revised version of the VAG bov. Instead of a silicon diaphragm, it uses a piston
To make your VAG bov fit on the turbo, you will need to file the plastic bump on its face. Also remove the metal rings from inside the holes, so that the bolts fit through.
If you are daring enough (or do not want to change the electric plug to your harness into a VAG type one), you can combine a PSA bov body with VAG bov internals. This is what the end result looks like. Be careful, if the internals do not match exactly the body then the blowoff will never work properly, always leaking boost above 0.5bars.
Combination: VAG internals on a PSA body. Sometimes it works, sometimes it does not – depending on whether the O-ring fits properly
