[asshanson]

Well, lot of updates in the past few weeks:
1. Got my "sniper" interface box, so I can load files that my tuner sends me. Computer can load tunes into the box (holds up to 6), and then hook box up via OBD2 and select which tune to load. Pretty easy to use, just select the tune # and hit upload button. Takes about 1 minute, and the box is quite small, so it would be really easy to do an E70 tune or something, and switch back if I needed to take a road trip where there was no E85. Something to consider next year.

2. Got my logger and wideband all wired up. Logs gps, g-forces in 3 directions, OBD2 inputs, wideband, and camera together. I'm pretty happy with the OBD2 refresh, logging TPS and RPM only right now, about 6-8 refreshes each per second. I could hook up a real Hz tach sensor if I wanted better RPM logging, might add that in the future. ECU is not aware of vehicle speed, it's on the front wheel, so I can't log that, have to use GPS which is meh. But I can derive speed based on gear and rpm if the GPS is too laggy.

3. Upper intercooler pipe extended a couple inches, fits much better and the coupler isn't kinked so airflow should be improved.

4. New tune loaded which has 15% more fuel (compensate for different MAF reading on my car, fuel trims are now zero, and WOT is much better looking AFR), and a bit less throttle response down low. Doesn't feel like a rocket ship at 1% throttle now, much easier to drive on the street around 30-40 mph. Feels like a normal car actually, which is better than the standalone MBE ECU it had before.

5. Tightened the wastegate actuators with +2mm of preload. Before the wastegates started to open around 11psi and fully open by 13-14psi. Now they crack open at 14psi and fully open by 17psi. Verified with bicycle pump on both turbos.

6. Now the car doesn't make boost. Couple weeks ago got 13psi by 4000pm. After the above changes, I can hear the turbos spool up when I press throttle, but with full throttle it reaches 0psi but doesn't budge past. Verified on mechanical dash gauge which is hooked to intake manifold, and also my boost controller has a digital readout, hooked directly to compressor housing, also reads 0.0psi. This is what I've checked so far:
a) Verified no rags or blockages in intercooler, pre and post intercooler piping, and turbo inlet piping. Also removed intake manifold, and couldn't see anything there or the head intake ports either.
b) No boost leaks, everything is clamped solid and all vacuum hoses are hooked up, can't blow into any, so none are torn.
c) Checked rear turbo compressor wheel, no blockage and spins freely, no shaft play. Have not checked front turbo because it's a PITA to get to, will have to check that later.
d) Checked rear turbo compressor recirc valve (basically an integrated BOV on the BW EFR turbos). Diaphragm not torn, spring not broken, appears to be working normally from what I can tell. Haven't checked front turbo, need to do this yet.

Things left to check: front turbo wheels spinning and recirc valve. Also want to remove both intake and exhaust on front and rear turbos, to make sure the shaft didn't break which would cause the wheels to spin independently. Once I've verified both turbos are operating correctly, I have no idea what to check next.

Any ideas?

EDIT: just got paid for my old exhaust and both T28 turbos, so I can't put those back on now. Worst case, might have to remove the turbos and send them off for inspection. Car isn't burning any coolant or oil, no smoking from exhaust, etc.