[James Blint]

I pointed it out when the ballast subject was brought up a few weeks ago. The 458 is not as far as i would initially think, depending on the circuit it can match the C7 or be up to 1s slower, mostly about how torque or traction is important, overall i would say it's about 0.5s slower. A few comparisons from RSR, mind you this is low temp (10/14), no tyre/fuel rate and supersoft, so impossible to match at SRS high temp, and 2x rates (this is already like having ballasts) :

Laguna Seca
458 1.21.3
C7R 1.20.7

Monza
458 1:46.1
C7R 1.46.2

Nurburgring
458 1.56.5
C7R 1:55.5

Brands Hatch
458 1.22.6
C7R 1.22.0


Imo Ballasts should be as this:

C7R : 100Kg
458 : 50Kg
M3 : 0Kg

We could even include the Porsche RSR with another 50Kg, im not sure exactly how this BoP could be also adjusted with engine limiters and how it would impact further tyre wear and consumption but the easy way is to add ballast as basically +10kg is 0.1s slower. In the same way race pace is usually 1s slower than quali with 90l or so in the tank (as long as you have fresh tyres for a few laps)