Past another durability milestone today, have the boost set to 1.33kg/cm (showing about 18psi on VBOX in logs). Tested the engine compression after 1000km running at this boost setting and its ~120psi region. I reset the WI mixture to 4 turns (increased over the high power setting to give more safety margin) and took out 0.5 degree of timing at this boost and around 3 deg at higher boost levels (yet to try the higher level). AFR is 11.1:1 and is a bit lower to increase knock resistance for higher duty power application on track V's a one off power check.
I decided to go richer *11.10:1 target* and higher boost as its far safer (cooler, less prone to fuel quality variation that can induce pinging) than aiming less rich for optimal power at a fixed boost range setting
Power is ~280rwkw on average
90-140 times (over a spread of 6 separate tests) 2.82 seconds
My next boost increment step is 1.53kg/cm or 1.5bar (21.75psi old money!) When the weather gets cooler I will do that last step (haha for now till the next goal!) I am very happy with the power now and the way it goes "it flat out hauls"
so am in no rush to step up to the next point............ but it would be nice to have over 300rwkw on my VBOX measure, but all at the expense of drive line durability let alone other parts so I will try to refrain from pushing more.