Yeah, the first thing is definitely the Turbo. I mean modern engines have so much driveability that in comparison they seem like a normal street car. The 98T is nothing...nothing...nothing... nothing... 8000rpm... wheelspin! The fact that the engine is practically dead under the full turbo pressure rpms, forces you to use lower gears, but then you really need to be careful because with 1st and 2nd gear it's a total wheel spin at full throttle and full boost.
Then you have the aerodynamics. The car is pitch sensitive and there are no 3rd spring magic or similar, so you need to set it very stiff and very low (there were no limits in the rules) so you keep bouncing everywhere and scraping the ground... not very good for handling.
The tyres are unbalanced front/rear because you need traction, so you need to try hard to make the car neutral and if you do you have no traction and if you have traction you have understeer and if that and if there and if what... messy.
The gearboxes of course, no semiautomatic magic here... If you try it full hardcore with clutch and everything... not easy for sure and you waste lot's of time too.
As usual with AC, when you start driving it you're like "well that's not too hard after all" except when you're spinning out of control because of severe wheel spin lol. But overall it's still driveable. The problem is that you can't understand where the actual limit of lap times is. There's so much potential and you can feel it... but you can't find it. If you drive aggressively it's challenging and stunning, but all the wheelspin makes you slow. If you drive smooth, you will find yourself often without enough boost.
I haven't finished the physics of the car yet, far from it, but it seems already that continuously blipping the accelerator will keep turbo pressure in an acceptable level and keep your engine ready to kill you at the exit
All in all, a beast of a car, very excited with it. Personally I'm not really into single seaters, I always preferred GT cars or vintage cars... but boy the 98T is amazing