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i had the same issue with both a knockoff and a real hks ssqv. i checked the usual, boost leak, o ring leaks etc. i could not figure it out. i replaced it with a synapse b.o.v which solved the problem. i'm using the synapse hks adapter which mounts to the original snap ring hks flange. no welding involved
I had an HKS gen1 valve on my car for about 6 months. No fluttering noises or compressor surge if the spring is properly adjusted properly. BUT like mentioned above, if you purchased some cheap knock-off. It is anyone's guess what is going on with it. Keep adjusting the spring pressure and see if you can dial it in. Most pressure relief valves are going to need a little tweaking after installing.
If you did purchase a knock-off, why purchase ANY questionable quality part that deals with boost manipulation for your car?? This simple valve if not operating properly could cause turbo or engine damage. So why risk either of those two very expensive components on trying to save a few bucks on a pressure relief valve? Not worth it IMHO. If you did purchase an authentic HKS great! Hopefully anyone reading this considering the cheap alternative will think twice.
I ditched my HKS for a GReddy b/c I just could not stand the sound of the HKS. It was so screechy/screamy it just sounded cheesy to me. But again, that is just a personal opinion.
93FD Silver on Red - HBP 500R ** SOLD Sad to see it go..
Build it once...Build it right... No shortcuts.