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True. The whole engine just isn't designed for revs. It's designed and manufactured to do 180bhp and 40mpg.
You want a rod ratio As close to 1.75 as possible (length of rod against stroke) the F4r is 1.54, b16 meanwhile is 1.74:1. This means less of the Piston speeds are lower in comparison to...
Reduced throttle mode. This is the issue we had with rich's but his was completely incoherent, had everything it needed but wasn't happy so we put it on cable throttle
I've got one in at the moment that's killed the engine (amongst other things but I won't go there) filter has done 4 track days and is cleaned and oiled after every track day. Still didn't work.