Boost Problems

[Dre25]

Hey guys, i have a 2003 bora 18t US spec. I have APR 91 oct program, 2.5" cat back exhaust, samco TIP, and N75J valve. when driving, doesnt matter what gear, when i give medium throttle, somewhere around 8-10 psi my car starts to surge. I can feel it slightly in the seat of my pants and also i can see the needle on the boost gauge surging from 7-10 if i hold it there, if i push the throttle to the floor and go past the 8-10 psi the car pulls just fine. it only seems to do it at mid throttle around that psi range, once i push all the way it goes away, and at low throttle it doesn't do it. Just at mid around that range. Does anyone have any idea of what it can be. the car runs like a champ, but things like this seem to irritate the hell out of me. other than that it runs awesome. any help would be great.

"I might have been concieved in the back of a Dub, no wonder why I love them so much"

[Dre25]

Anyone there, I need help on this matter. car is running good, but around 8 psi, it sometimes starts surging or fluctuating. any help would be great. Cheers!!!!!!!!!

[Dre25]

Anyone out there that has an answer. Nothing is broke, but just frustrating. Any help would be great. Thanks!!

[Dre25]

Anyone out there, info please!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[chris.fulton]

Have a look at this thread from the mk4 golf section, sounds like a similar problem to yours

https://www.vwaudiforum.co.uk/forum//showthread.php?t=43225

[Dre25]

Anyone out there have any other info that can help. I changed out my N75J and put back in my standard H one, and it still overboosts, but definitely not as much or as often as with the J valve.

HELP HELP HELP!!!!!!!!