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Hey guys. Have an issue with my r33. Lately (last 2 tanks) has been Randomly pinging/ knocking on boost. When I first heard it, backed off straight away. Temps seemed fine and was driving fine off boost, almost as it hit full boost, would ping. Suspecting shit fuel, put in some octane booster, and that seemed to fix it. Fueled up at a different servo, and was going better than ever, zero knocks. Put it down to shit fuel. Current Tank is about 1/4 full, rolled on in third coming home tonight and it pinged again. Car drives fine, and exactly the same everywhere else, no strange noises, temp is fine. Car has a Vipec plugin, deutchworks 255l/h fuel pump with 14v feed, splitfires, hyper gear turbo, pretty basic setup. 260ish rwkw, Tuned by Mitch (of haltech) Car has been the same for the last 2.5 years, parts were new (apart from ecu) at tune time. Both times it’s happened now, it’s been between 1/4tank and a 1/3 tank of fuel, unsure if that’s linked. Initially thought maybe a shit fuel pump, but thought that would be more consistent From what I gather the Vipec plug ins don’t have knock protection? Either that if mines not setup. Will have to head back to tuners I think. I’m guessing if I can hear knock, it’s probably already doing damage. After first tank with knocking, pulled plugs out (all looked normal) and did compression test, 165-170 across all 6. Top of pistons looked unmarked. Bloody intermittent issues! Anyone had a similar intermittent knocking issues/things I should check? Cheers