Hi guys, never posted for advice here before but heres hoping someone can help.

My car has a serious boost issue. Boost will hold strong at 1.8bar, however on hard 4th/5th pulls it will very breifly drop to 1.0 bar then shoot back to 1.8.
During the drop you can hear the turbo work very hard/ over spin.
It done this a few months ago and withing 2 days the shaft in the turbo bent. Its just back on the road and mapped yesterday and the fault is still their.

Spec of car is 03 sti, 2.1 stroker, fully forged, alcatek ecu, fmic, ramair filter, rotated owen developments gt3079, tial wastegate.

Andy F suggested the intake pipe is being sucked shut, I have sleeved the silicone pipe with a peice of aluminium but it hasnt made any difference. He also said my front lambda isn't reading but this shouldn't effect anything. I'm going to pressure test the fmic pipework later today and hopefully this will show something however the boost drop feels very controlled unlike a harsh boost leak.

Cheers.

 

Call him back when you have more info on it, I would have thought he would help you out.