1.2 bar of boost

hey guys. after watching times and times again of the video, can i say that it is safe to be around 0.78-0.80 lambda at 1.2 bar/ 17psi of boost on a ca18det?

hello 0.8 wll be safe yes

... and assuming the rest of the engine is up to that boost level. Different engine packages, and fuels, will perform best at slightly different lambdas, depending on their characteristics.

I would suggest using that as a guide and then fine tuning while keeping an eye on EGTs.