I've been working at the details over the last several evenings. I got around to re-welding the downpipe v-band flange. Post turbo leak won't affect the spool but its good to have the biggest exhasut leak fixed. I pulled the diverter and welded it shut. The old oring sealing it to the head was poor so that got replaced too. I've got an egr valve, for show for emissions, but its plumbing had a small leak too.

While fixing exhaust leaks I decided to make an adaptor to pressurize the entire intake to check for boost leaks. Found and fixed a few small things, but nothing was a smoking gun for the slow spool.

This just leaves the exhaust manifold itself. It is warped by the #4 runner and it has a crack between 2 and 3. I priced a new one today, it isn't as bad as I was suspecting, but its significant and the holidays are impending. I didn't check availability when pricing the part. Hopefully they are actually still available.

So after getting all of the easily fixable leaks remedied and playing with the boost control solenoid settings I have hit 13.5 PSI. At that pressure, its healthy. Once boost control kicks in, it can't hold. Too much pre-turbo leak and as it tries to modulate the wastegate it loses its head of steam and falls back to wastegate pressure ~8-9 PSI. Even then it aint slow, but I feel there is still plenty being left on the table.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff