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detonation issues standard RB25DET My R33 GTST has developed some detonation under high load, low power street driving conditions - eg driving up my steep street at 40kmph in 3rd gear - engine light comes on, hear the rattle, back off the throttle and/or drop back to 2nd to stop the detonation - I try to be mechanically sympathetic with the old girl. The car went in to the tuner this morning to get it sorted and we discussed the detonation issue - on the dyno the detonation was able to be replicated, but it went on the dyno late in the day so she's having a sleepover to get it resolved. I read this thread with great interest The car has only recently started to detonate under high load/lowish revs conditions - and when I hear it or see the engine light come on, I back off and/or change gear. It's been daily driven on commuter runs for the last 12 months - almost no "spirited" driving to blow any carbon out. Not all stop/start traffic, some highway driving. Obviously I'll take guidance from my tuner, just seeking some input from SAU on: possible reasons why an engine would start to develop detonation issues (I always use BP Ultimate and use about a tank per week) sanity check what my tuner proposes - I've no idea yet - likely new plugs, which is fine, even though the current plugs have only done <10K km or so (Platinums) ECU is an Apexi Power FC, turbo is HKS 25/30, engine is a standard RB25DET. Definitely not looking to flame my tuner - I've been using them for a long time - I'm just trying to be better informed so I understand what my issues are and they're likely resolution. cheers Mike