Thanks for all the info, P1! Yeah I think it is Tony B's. Thought I'd give it a whirl since he expressed in his post the wishes someone may take up working its physics out, so I was like why not... "Did you take the physics on from me basically begging on the physics/discord?" I think I missed that post lol but that's cool how somethings work out.
Yeah the aero seems to need a lot of work. I have come across wind tunnel data but I think the drag numbers don't include a driver in the kart, surely that presents a factor of the overall aerodynamics. Also the suspension work seems to be copied from another kart on RD, so that too I am attempting to build up new geo from that. Yeah seems like a lot of engine brake torque is present resulting in a lot under steer when you let off the gas . I know this is a thing in karts using a lawn mower engine but not sure if it's present in a Superkart...
Thanks for the info, man! Good to know someone on here that has had experience in them. There are also a handful of forums with a lot of kart professionals active too!