Boost goes up and down?

When i get on the gas in 4 gear and get boost to go over 15psi i see the boost gauge going up and down from like 17ps to 15 and back to 17. I can hear the turbo and i can tell that boost goes up and down. The car pulls fine and the logs do not show any knock under boost. Is this normal or there is a problem her?

Thanks, Taras

 

boost control just limiting probably

 

Could be, just read(yes i do search sometimes) on nasioc and i guess its boost surge, at least thats what it look like.

 

boost surge, bcs, wastegate...sounds to be barely anything to me really

 

should i turn wg arm a turn down?

 

i would say dont bother messing with it, doesnt seem to be going with any real extremes. is your fuel map and stuff constant still? (i assume you pulled it)

 

yeah, the map is a little squirrelly. I messed with WG arm a little and added an axle back. Apparently the car was tunned aggressively before i got it and now its even more aggressive, now i just need to have a tuner to look at it.

 

You still are using the stock BCS, right? Sounds like you just changed a number of pieces that effect boost (WG spring, exhaust). It just needs to be tuned.

 

+1 (Turbo Dynamics Tables?)

 

There's two or three issues:

1. wgdc is too high causing excess overboosting
2. turbo dynamics are too aggressive causing the car to pull too much wgdc after seeing overboost
3. wgdc temp compensation may not have a steep enough slope

 

well then, there you go. lol