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Do not get hung up on boost pressure numbers....
Pressure is simply a measurement of resistance, lower boost is good, it is less heat. Your turbo is maxed out, smaller piping will give you more boost, also more heat, less power, and a smaller power band because resistance makes it harder to move air.
Think of the engine as a air pump, the faster the engine spins, the more air volume the engine can move.
The reason you make more boost at lower RPM with your turbos, is because the engine has more resistance at low RPM.
As engine speed increases, the engines ability to flow air increases, it does not require as much pressure to move the maximum flow the turbo is capable of moving at higher RPM. This is why the boost falls off with the size turbo you have. You do NOT want to use stiffer wastegates. The wastegate is a safety valve, the backpressure between the turbo wheel and the exhaust valves is what is opening the wastegates. Putting in stiffer wastegates will allow higher backpressure that will cause engine damage. If you want more power, you need to increase turbo size, 600 wheel HP is max power for your turbo, the exhaust wheel is simply to small to flow more air efficiently. Your C-16 power curve looks very good. Your pump fuel tune with the Haltech could use a little more work......
Looking at your logs, you were making about 2 PSI more boost on your Haltech tune, yet you only have a small peak power area that only made 10 more PEAK HP.
Your power band is smaller with the Haltech tune, and your low end power is down about 10% from the Stock ECU tune.
At 4000 RPM you were making about 440 rear wheel torque with the stock ECU pump tune, The Haltech pump tune shows about 405 rear wheel torque at 4000 RPM.
It is likely the ignition timing is too high in the low end on the Haltech tune, causing slower spool up. Nice Build!
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