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After seeing this thread, I checked it out on our test BRZ premium (no push button). The IAM is persistent. This is EcuTek tuned.
Like mad_sb said earlier, having the car reset the IAM after each start is not how the Subaru knock system works. This is very much a Subaru ECU. Having the IAM reset after each start somewhat defeats the purpose of the system.
Why would you want the IAM to reset higher after a restart if the ecu had been seeing knock and had lowered the IAM to stop the knock? The IAM should always start where it left off and move up or down depending on how happy or unhappy the ecu is with regard to knock.
Sounds like the ECU is being reset after/during each startup, and may be a bug affecting only the FR-S.
I'll be tuning an FR-S tomorrow, I'll take note and post back.
-- Bob
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