Realistic Shadows / AO on a downloaded Vehicle Model

Hey all
So i picked up this cybertruck model and was wondering how to get more realistic shadows. Im using the HDRI background for lighting for some tests but the shadows just kill the final look
any ideas what im doing wrong ?

attached a screenshot for ref

Specifically here im having issues with the look
tried messing with the shadow maps but no joy

Looks to me that you have no shadows at all !? Do you have a light in the scene (besides the hdr) What type of graphicard do you have ?

I for now im using just that HRDI Background, no lights but with lights some shadows work others dont its really buggy
graphics card is a…ahem…Nvidia 960 (sorry all i could afford at the time, planning on getting a 1660 soon)