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So, I’d say you have a small turbo made for high boost. These units from Garrett really shine when going over something like 1.5 to 2 bar of boost. Meaning, at low boost you’re running, it’s not very efficient.
2nd, 3.2’s have pretty big ports from intake, heads, and headers. IMO, T4 sized turbos are just fine for these motors. T3 is probably better suited for stock 930’s. With a T3 60mm turbine and a very tiny 0.63 A/R turbine housing, you’re leaving a lot of higher end hp on the table.
Simply put, you’re choking the crap out of the top end of that motor. The turbine is fairly restricted and I bet you’re seeing a decent amount of back pressure. I’m sure it spools like lightning though!
Make sure your exhaust post turbo is totally free flowing. No chambered or bends through the muffler. Straight from inlet to outlet would be ideal IMO.
If you want it to wake up, an old school 60-1 or 62-1 would be a sweet turbo for it I’d imagine. It would much more on/off and laggier, but when it hit 0.5 bar, it’d bring a smile to your face!
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