i saw this article the other day and i thought it was pretty sweet. basically tells u how to make a HMT style boost controller I havent made it yet but i did go and get all of the parts. I will update when it is done!

http://forums.turbobricks.com/showthread.php?t=59089

this may be a repost for all i know

 

that's very old. i made one and had a 5psi boost spike. i ended up porking out $60. for a turbo xs mbc and it runs a solid 12psi with no boost spikes or boost creep.

 

dual stage controller pwns you