I can definitely relate to the whole ambient temp issue especially during tuning. My car is N/A and my Uprev tuner had to put quite a large safety margin when tuning the ignition timing on my car because it was 130+F ambient temps and did not want any detonation to happen. He said that if I came back next winter I can gain another 10whp just by advancing the ignition timing (I made 20whp from his tune). Florida's humid summers make it even worse.
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