Boost cutting out - Need help!

Hi guys

I am running an Evo 6 at 1.1 Bar and am experiencing hunching when I start passing 5000 rpm... This is happening mainly from 3rd gear onwards for some reason and the turbo starts cutting out and losing pressure all the time. I thought it was a leaky boost gauge which I replaced with a new Greddy but still no change.

My Boost Controller has also stopped working and switching between low/high boost or switching it off completely has absolutely no bearing. I checked the HKS filter for dirt but its clean and I cannot find a solution.

I just had some HKS plugs put in but I am not sure if this is the problem. Could the plugs have made such a dramatic impact?? I some how doubt it...

Any suggestions on how to fix this or what else could be the root of the problem? (I was planning to stick a fuel regulator, modified fuel rail and a slightly modified Evo 7 Turbo this weekend, but its pointless to carry out the work until I find a solution...)

Any recommendations here would be greatly appreciated!

sounds like a boost leak. How good is the BOV you have on it. And also check the IC piping and intake to see if there is a leak anywhere. Or it also could be the wastgate

Thanks for that. I will run the test tonight and check the pipes... BOV is brand new - Tornado (I think its Australian...)

Does sound like a vacuum leak but check your plugs and wires just to be sure. Also maybe the injectors are dirty. Just a thought

What turbo are you running? It is normal for the T25 turbo to decreace by upto 10psi on the high end

did you happen to read his post..he has an evo not an eclipse

hey bro. i would have to say its ur belts. whens the last time u changed them? cuz my turbo was doin the same **** until i got new belts now it runs like a charm