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1. You desire the bypass on the hot-side as close to the turbo as possible, for best longevity of that turbo, and quickest response (quickest pressure drop)
2. You can ONLY run the bypass open to the atmosphere IF it only vents when you are off-throttle and not at idle. There is a blow-off designed like that, the HKS SSQV. Now, understand that this is not an IDEAL setup, because it will still sometimes catch the maf and over-fuel the motor, and also, that blow-off is slow, so you will still surge some (bad for the turbo)
3. your ideal setup is a push-type bypass (blow-off) like the greddy type-S or HKS RACE on the hot side, recirculated to the post-maf pre-turbo intake pipe. The bypass should be set weakly such that it is open at idle. Dial the spring tension (adjustment) loose enough that you eliminate all audible surge at nearly all throttle positions.
other tips,
use a dedicated vacuum line/source. No T's.
If your bypass isn't working in the mean time, you can remove the wastegate arm from the wastegate "flapper" to eliminate the turbine (no more boost). This will allow you to drive the car as hard as you want, without surging the compressor and damaging the turbo.
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