sc3757

iTrader: (2)

Hello ladies and Gents, so I've been having a troublesome problem these last couple of weeks. A dreaded boost leak has been haunting me. Let me start by giving a little background info. Car has a 1jz with a driftmotion single kit, safc2, and some other supporting mods. Car was previously running on 16 lbs successfully with no problems. I parked the car and it sat overnight, went to drive it in the AM and car was only boosting to 7psi. So I automatically checked vacuum lines, and couplers first. Everything was fine so I looked to the wastegate (deltagate mk2, was on the car when bought). Took it off gasket was broken/burnt so I ordered a new one. Took the wastegate apart and all looked well. Replaced the gasket and re installed the gate. Car started boosting to 9-11 psi. So I proceeded to check the BOV (hks ssq). The bov spun in the flange easily. So I got a new O-ring and c clamp and that fixed that problem. Car was still boosting the same, but now I am getting a whine from what sounds like the turbo (looks like turbo from cx racing). I have done some research and signs are pointing to my turbo going bad/ Is. I have been shopping for a new turbo these last couple of weeks anyway to upgrade, but I would just like to get some input from some of you all if that is possible. I do plan on replacing the wastegate with a Tial 44mm when I do the turbo as well. My question is, What are the chances of the turbo causing the leak? Any input of any kind would be greatly appreciated, Thanks in advance!

blk&blu*j

iTrader: (1)

Is the WG leaking off boost, not closing fully until the spring pressure is reached does it have a fire ring not familiar with that gate? are the front and rear housing tight to the cartridge?
I'm not familiar with DM turbo's does it have a large O ring at the front cover to Back plate?

Is the turbo smoking on start up or under boost IE: bad seal or worn bearing.

Manifold bolts tight? flange to turbo gasket burnt or leaking from loose bolts.
I personally have never seen a turbo start loosing boost if it its on its way out it usually just runs till it fails.
GL. LMK.

sc3757

iTrader: (2)

Wastegate does not have fire ring. I am going to pull it off tomorrow to see if it's sealed right there from the dump. No smoke on start up. A little under boost, nothing major. I do need to check the gasket on the turbo as well, but in did check the bolts. Lastly I have no idea if the turbo has an o ring behind it and the front and rear are tight. I took a video trying to get a better sense of the sound and the car definitely sounds weaker than previous times I have filmed it. No real distinctive spool and wastegate sounds like it's starting to open prematurely.

blk&blu*j

iTrader: (1)

It is possible the wastegate is not clamped shut and allowing boost pressure to go by it would be like having a boost leak except at the gate similar to a leaking valve not really noticable until you do a leak down with the cams removed.
This would be my first suspected area.

sc3757

iTrader: (2)

New gate should be here by the end of the week. Hopefully this solves the problem. Thanks for your help man. It's greatly appreciated.