my bov is a adjustable one so how should i adjust that softer or harder?

 

harder

 

so if i turn it harder i will hold more boost?

 

If you turn it harder, the diaphram will just release faster and make a harder bov noise. It doesn't make the spring stronger.

 

yes it does . it puts more preload on the spring so it will hold more boost. but your low end boost will suffer and you can get compressor surge.

 

i will try it tonight and see if it work.

 

I upgraded to dual springs

this statement indicates you swapped one color for another, what color and size combination do you currently have?

 

greddy 47mm wastegate and a red wastegate spring which is 1.5bar

 

i had turn the bov to the harder side but it still doing the something to me, so i had unplug the mbc from the wastegate the car actually feel a lot more better, it that ok to unplug the mbc from the wastegate? and i can hit 30psi with that unplug.