Boost fluctuating

[1stGenTSi]

Installed my hx-35 a couple months ago and I just started having an issue with the boost fluctuating. It seems to only happen in 5th gear when flooring it from about 60-75. Only running about 17psi right now and at full boost my boost gauge bounces back and forth from about 14-17psi quickly. Second and third gear pulls hold steady to red line. Fixed some small boost leaks but it's still there. Running ebay 38mm off o2. Any ideas?

 

[delta448]

What MBC are you using? Sounds like you might have some spring bounce either in the controller or in the WG itself, what is the rating of the spring in your WG right now?

Maybe it's time to do the dodge garage mod too...

 

[Fabian]

definitely sounds like your boost controller. I always recommend electronic boost controllers if you have the money for one. Even a used one you can find for a killer deal. If not, a Hallman boost controller is the key to a good manual boost controller

 

[DSMDriver69]

Are you running hard pipe or the stock ones?

 

[1stGenTSi]

Using a Joe P mbc with a 1bar spring in the wg, all hard piping. I'll try running just wastegate pressure to rule out the mbc. Thanks for the replies.

 

[96pos dsm]

try down shiffting