No boost whatsoever

[flat tire]

Howdy all. So a few months ago I gave my track car to this Mexican hippy to daily drive. A few days ago he let me know that it's not boosting at all. We pressurized the charge piping successfully and besides that it's clear the turbo isn't even trying. A month ago he lost boost control, was overboosting, we replaced the N75 and all was well. This time, opposite problem. I would imagine it's either N75 or the wastegate. I don't see why the N75 would fail 2x in a row so perhaps the issue was with the wastegate all along and we jarred it during the install making it temporarily work again.

Few details:

• K04 w/ untouched stock wastegate
• Not in limp mode / throttle body opens all the way on WOT
• BOV / no MAF / custom tune

Anyone have a similar problem?

 

[golfballer78]

does an upgraded wastegate help? or you need a new turbo?

 

[Goingnowherefast]

Any smoke out the backside?

 

[flat tire]

Nah, no smoke out the backside, and no blown turbo noises. We have an EGT gauge to keep the TITs in check and I doubt he's managed to blow it otherwise.

Will K03 WGA work without remapping or is the preload / linearity different? I have one on hand from my old K03, but don't really want to spend the time adjusting my tune if it doesn't work out of the box.

 

[donjuan1jr]

Take a pry bar and see if the wastegate moves.