Just wanted to inform anybody who has or may be considering the HKS Super Sequential BOV should perform a pressure test on their BOV before finishing their install. I have had the orginal SSBOV and the current billet aluminum piece for about 4.5 years so I have learned a few things about these items that the tech people at HKS seem to be oblivious about. For starters, the BOV will normally need to be adjusted so that the valve seats securely when at idle. I have been running for I don't know how long with a BOV that was slightly leaking and therefore would not hold boost as effectively. After removing the upper IC pipe with the BOV attached I performed a pressure test by capping one end and fitting a bike pump with an adapter on the other. The end result was that the BOV would not hold ANY pressure. This explains why the car suffered horribly at WOT and any other situation where the engine was entering positive pressure. To readjust the valve you will need to remove the large aluminum cover piece using a hex wrench (I think it's a 3-4mm). After removing the cover, you will notice that the valve with the purple nipple will need to be inspected for debris and adjusted so that it will seat flush with the cover. After you realign everything, you will need to carefully tighten the large cover in a cross pattern to ensure the valve seats straight.
Adjusting the valve will probably require you to tighten the adjusting screw to prevent the valve from opening too early. I have a theory that from the factory either the valves are not seated properly or the adjustment screw is just too loose which eventually causes too much free play in the valve ...repetitive use will eventually result in misalignment of the valve. This may or may not explain why some people encounter stalling problems with the HKS SSBOV and others do not.
Adjusting the valve will probably require you to tighten the adjusting screw to prevent the valve from opening too early. I have a theory that from the factory either the valves are not seated properly or the adjustment screw is just too loose which eventually causes too much free play in the valve ...repetitive use will eventually result in misalignment of the valve. This may or may not explain why some people encounter stalling problems with the HKS SSBOV and others do not.
