BP turbo build/advice

Originally Posted by hc_416

well..... another problem came up.

My first two rides went great; on my third ride I went to give it full throttle and it fell flat on its face. No boost, and a lot of lag. I didn't want to push it after that so I took it home. It now just doesn't build boost anymore if at all and when I give it gas it falls on its face. It will build boost at random times or when I go first to second 3/4 throttle it seems to work, then when I hit third it just dies. Really looking for ideas what it could be or what I should look at. Here is a list of things that have been tired,

1. Put a new hose and stiffer spring on the BOV
2. Check to see if the turbo is spinning free with my hand(it is).
3. I checked both waste gates to see if they were stuck open and they would work when given pressure. I just pushed on the valve with my finger.
4. I reran the vacuum hose with new z1 line.
5. I have looked for leaks on the cold side by looking at the t-bolt clamps and trying to move them with force. I also checked to make sure they were tight.

I think I will take the cold side apart and check to make sure i put it on tight but any suggestions would be appreciated.

Originally Posted by Boosted Performance

Don't put a stiff spring in the BOV. The engine vacuum at idle, when warm is what determines your BOV spring. Putting a stiffer spring than the vacuum can open, will cause issues.

Double check that your wastegate lines are connected properly. That is more than likely your issue. TB port to lower ports of the wastegates, and make sure all other ports at the bottom half of the wastegates are close. Leave one port open at the top. There is something wrong there for sure.

Originally Posted by hc_416

I'll check again, but i have the lower ports connected and the top ports open to air. I didn't check to make sure all the plugs are in. Great idea, Just to make sure I used a 5mm silicon hose for the vacuum, that is appropriate correct? Also shouldn't the gate work with just spring pressure if there is no pressure at the bottom of the port?