So I have been having this problem for quite some time now. I have tried everything I can think of to solve this problem but still no luck.

So when I down shift or even just press on the gas normally my evo does not seem to want to boost like it should. it will go to like 10 pounds and feel like its struggling. If i let off the gas and then press it again it will then boost normally. I took a video today so you can see what im talking about.

 

Boost leak test? Boost control method?

 

boost leak tested and there is not a single boost leak


and for the boost controller im running the perrin mbc
http://perrinperformance.com/i-13323...ontroller.html

 

what are your other mods? i would ditch the mbc and get a 3 port and a retune.

 

injen ic pipe
ams fmic
gsc cams
hks tbe
injen intake
evo 9 turbo
and that perrin mbc

 

who tuned your car? maybe that mbc is jacked up.

 

or your wg actuator.

 

car is untuned from what i know. i bought it this way.

and it was doing this on my 8 turbo as well so i dont think its the wastegate.