so my rx7 originally came from ga and was tuned down there, while down there my bov had a nice strong release sound like it should. Once i moved up here it started to flutter badly so i released the tension on the bov to as soft as i could and still have some pretty wicked flutter. Just wondering if anyone else has had this problem and what they did to fix it, it is a greddy type s bov.

is it compressor surge or bov flutter?

Edit: just realized that this thread is a year old.. lol not a lot of new post in the FI section

nah it was bov flutter since it was set for a little bit thicker air, but have since fixed it for everything but below 5psi which can't do otherwise it leaks.

the cure for bov flutter is the SYNAPSE diverter valve.
http://www.synapseengineering.com/

I got the cure its called adjusting your spring settings, a hell of a lot cheaper too :P. Just was surprised how much of a difference it is from sea level to here.