BOV/recirculating valve question????????

[newman]

@AWDrifter

I have a Forge Motorsport recirculating valve on my Evolution and when I am in fifth gear the valve “flutters” like it can’t hold boost BUT, it holds boost fine when I take off at full boost and go through the lower gears.
In fact it will hold much higher boost in lower gears.
I am thinking it might have something to do with vacuum or the fact the fifth gear is so huge. Fourth only goes to about 100mh and fifth goes to like 160mph or 170mph.
Any suggestions would be appreciated.
Thanks.
Mike

wow, 5th is huge. could be the duration that you stay in that gear?