BOV problem

hi
There is a constant problem greddy valve.always surge.
high pressure, there is no problem, but low and medium pressure surge.
What do you recommend.
or should I try another brand of BOV location change?
thanks

Hi Nick, what sort of BOV is it? Is it open to atmosphere, or like the standard one, a recirculation type?

And is it installed in the standard position?

hi steve
its not standart bov (blow of valve)
i canceled standart bov than i used greddy bov but its surging

Try a hardest spring but you will have a little surge at mid boost again