I've checked the plumbing for the defi and it looks all good to me. I did think that it boosts a little higher than the standard 10psi but it soon seems to settle around to 10. It will rev past 4.5k but just feels increasingly more strangled as the boost tails off. This definitely starts happening at the 4.5k changeover point.
Sometimes in first or second it can cling onto higher boost figures post 4.5k but not way up the rev range like a rotary should if that makes sense.
I'll grab some videos when I get chance!
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