1st Run: No boost 2nd Run: Perfect 3rd Run: No boost
 

I spent a few hours at the track tonight, and had something happen to my car that is pretty interesting and has never happened to me before. Actually, I had never had a boost issue before tonight. My first run at the strip, I slip the clutch and get off the light pretty good, I shift to second and the car felt like it pretty much stopped. My tach was climbing slowly and I realize I am not getting much/if any boost at all (from my secondary). I cruise the rest of the track, run like a 16.xx, then do a little test in the lot and everything seemed OK. I get my second run in and watch the gauge the whole way, and the pattern was pretty much a perfect 10-8-10, and do a 13.51 at 102.8mph. My third run came shortly after and the car acted like it did on the first run, but I could build about 2-3 pounds and I rolled to 17.xx.

Not really sure what happened/is happening. I'm not really worried, just curious.

Edit: Car is all stock save for DP and catback, stock turbos at 87xxx miles. Hose job is done.

I had a similar problem. Mine turned out to be a stopped up main cat. It would be a place to start.