We prefer racing road legal cars on street tyres (ST) but those are not available for all street cars.
Some use Hypercar Road (HR) tyres and those grip much better than ST. The solution is to pair HR with Semi Slick (SM) tyres. The two are almost the same when it comes to grip.
The most important thing we look after when arranging the cars is that they are road legal cars. In other words, if you cant select ST, HR or SM tyres for a certain car, it will not get on the sever.
The cars we use are not perfectly balanced in performance like for example GT3 class cars but we try to keep the lineup within 2-3 sec of each other.
At the moment, Lambo Gallardo at Imola posted 2.8 sec faster time than SLS Mercedes and this is acceptable.
It is not uncommon that more experienced racer in slower car, wins the fight against less experienced one in faster car. Or at least they have more close fights than what they would have if they were in the same cars.
It works so far and the races are very interesting.
We do not use ballast for the cars. If the car is too fast (488GTB, Lambo Aventador) or too slow, we don't put it on the grid.
The lineup on Heavyweight server for now looks like this:
AUDI R8 PLUS
CORVETTE C7 STINGRAY
LAMBORGHINI GALLARDO SL
LOTUS EXIGE V6 CUP
PORSCHE 911 GT3 RS
PORSCHE 911 R
PORSCHE 991 TURBO S
TOYOTA SUPRA MKIV TUNED