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When you reference stock, what are you referencing exactly? Stock SR ECU tables will be way way off the map on a cammed engine at 16-17 psi with a bigger turbo.
Stock ECU tables are also HORRIBLE. Knock out the wazzo on my engine on track with the SMIC, and still even with the FMIC. That's with boost below the stock amount of about 9 psi (BCS removed, so it was straight actuator at about 7.5-8 psi). I ended up turning the CAS back a couple of degrees to get the engine to survive until I could tune the stock ECU myself.
21 degrees at 17 psi, figuring an SR at 8.5:1 likes around 29-31 degrees at 100 kPa, gives you only 0.5 deg/1 psi of timing retard, which is not enough at this much boost in my experience. On track SRs tend to like more like 0.8-1 deg/psi of retard in my experience. A street engine can probably tolerate more like 0.7-0.8 deg/psi of retard. But 0.5 deg/psi is too aggressive.
And too aggressive means it is probably getting some phantom knock here and there in the rev band when things get a little warm, with the occasional higher bit of knock activity. If you don't have a bandpass filter on a specific range of frequencies, you could very well not be picking up phantom knock over valvetrain/bottom end noise.
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S13 Hatch - Goes around tracks quickly
DEFSPORT
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