This awesome epic engine glow is THE highlight within of the Flysimware Cessna! I try to advocate for the same engine glow on the low pressure exhaust turbine inside the CFM56 turbine exhaust cone, but Fenix has not answered to my Fenix-prayers to add cool glow to some aircraft parts like brake discs or turbine exhaust (yet).
Well there is no way to replicate the engine glow. It´s just there when starting a flight.
But in older Cessna versions there was a bug having the engine glow gone when switching on the lights the lazy way by pressing L on the keyboard. Another press L makes the engine glow appear again.
The glow is slightly visible during daytime and very obvious at night time. If the glow is not visible during nighttime try to press L. This should always make the turbos glow again.