It's hard to tell without seeing these cars in person. But the AF will not always change when the ECU pulls timing. These motors might just be very sensitive to knock levels. Remember that the ECU is using a narrowband microphone to measure the characteristic sound signature knock gives off, but isn't a direct measurement of knock.
Hi Tomatoevo! Greetings. I guess you guys already know us from the S2000 world. Your S2000's as well is very prone to pinging & knocking even with the stock ECU. I have had nearly stock cars ping away on the dyno with nothing more than intake/header/test pipe/exhaust.
Time will tell if the 370's are as knock sensitive as I think they are.
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