My money is still on improper valve adjustment and high rpm valve float…
A : I cant see how Toyota wouldn’t adjust the valves on the engines they send to Lotus
B: Why should the Lotus’s valves float and the Toyota ones dont? They would only do that if the Lotus version had significantly higher backpressure (i.e. a turbo in the exhaust).
Most Lotus guys think the rev limiter is just a suggestion, as in maybe you should shift now or maybe not