RE: What is the lightest 80 to 90 sized turbine avalable
80-90 size refers to Newtons of thrust, so he means a Turbine with that thrust level:
Lightest EvoJet 90 also the currently the slowest spool up time of the new fast spool up turbines, look for the vidio's on RCU takes about 7 seconds from idle too full thrust.
Mike