This quote is about the Hondata reflash (regular reflash, not S/C, but worth reading):
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The TSX uses adaptive knock control. This means it will listen to the knock sensor and advance or retard the timing appropriately. This is good as it means the TSX will readily adapt to higher octane fuel and add a couple of degrees ignition advance. The TSX ECU only takes 3 or 4 power runs to adapt, and is constantly relearning. Unfortunately the side effect is that successive power runs can vary by up to 4-5 ft pounds of torque due to engine noise or knocking that is inaudible to the ear. If your coolant temperatures are too hot (>195 F) or the engine is hot from dyno runs, the ECU has a tendency to retard the timing.
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- the engine was not hot for the very first run (which was the 200whp shot)
- power did progressively get worse from there, even with 3-4 runs for the ECU to "learn" (which I had already done earlier in the day in any case)
- unsure what coolant temperature was but the car did not overheat (per the idiot gauge, anyway)
I have scanned my dyno chart, but since I'm at work, I can't access any online file hosting services. If anyone would like me to e-mail them a copy of the pdf, please post here or PM me and I would be glad to. The engine is giving out at higher RPMs - at redline, the HP drops VERY Sharply around 200hp, and the torque curve peaks at 4k and then just tanks all the way to redline.
Timing issue? Seems like a bad knock sensor would definitely cause that, and the P0325 code I got indicates that as the problem.