Derek Nye
Registered
OK...I guess then generic info just as you have provided is good. The simplest question is whether you simulated anything differently in one tire vs. another (one is slightly higher grip but lower life or some such) or if they are just the same with different external labels. Lots of mods are graphics-based, so variations have no effect on the handling or capabilities of the cars. We just need to know if yours has actual different engines and tires, etc., even if the differences are minimal.
This will also avoid the forum screaming about how much better or worse component A is vs. B when in fact they are identical
PS, the transmission and diff details would also be handy...including what type of hand or paddle shifter the real cars use.
As to the tires, yes there are different grip levels between the two, as well as slightly different sizes. Off the top of my head as I don't have the documents open right now, for instance tire A is 185 wide while tire B is 190, then there are different grip levels as well as wear. The difference between them aren't as massive as say, the tire war between michelin and bridgestone in F1 but there is a difference in performance.
The engines have different curves in that they have different HP, different torque, one might have max torque at 4k rpm while the other has it sooner or later. the actual cars use paddle mounted clutches, but the shifter is a sequential stick shift.