PC2 Camber question

[Bruno Iwanczuk]

Why default setup has more front camber than rear camber?

At least for GT3 and Formula Cars...

Also if we try to maximize or minimize camber it always gives you more front camber than rear camber.

For example
1.5 front/ 0.5 rear
4.5 front/ 3.0 rear

 

[Kyle Pearson]

It depends on the car's suspension design. The numbers are for static camber. So, depending on the suspension it will gain some camber dynamically as well. Typically, the front gains less so you dial in more static camber than the rear. If you have a car which gains camber equally front and rear, you can have them closer (but there aren't too many cars that do).

 

[Leynad777]

Why default setup has more front camber than rear camber?

Zero camber in the rear would be the best on acceleration, because you have more rubber on the track, but you will suffer grip in corners, so you need to make compromises. On braking the weight shifts to the front and loads the front-tyres. The tyre-deformation is increasing the contact patch and you can steer the front axis to take the best advantage from the camber without too many compromises. With the Porsche this may be the opposite, because it has so much weight in the rear, plus wider tyres and deformation, you get enough traction with higher camber. Front engine cars can handle more front-camber and the rear can get too light causing lift-off-oversteer, so less rear-camber helps to stabilize the car through corners. Mid-engine cars are in between, so the difference should not be huge.

 

[Bruno Iwanczuk]

Zero camber in the rear would be the best on acceleration, because you have more rubber on the track, but you will suffer grip in corners, so you need to make compromises. On braking the weight shifts to the front and loads the front-tyres. The tyre-deformation is increasing the contact patch and you can steer the front axis to take the best advantage from the camber without too many compromises. With the Porsche this may be the opposite, because it has so much weight in the rear, plus wider tyres and deformation, you get enough traction with higher camber. Front engine cars can handle more front-camber and the rear can get too light causing lift-off-oversteer, so less rear-camber helps to stabilize the car through corners. Mid-engine cars are in between, so the difference should not be huge.

So basically front engine cars get more tyre deformation in the front while braking than in the rear while accelerating and vice-versa?

 

[Leynad777]

So basically front engine cars get more tyre deformation in the front while braking than in the rear while accelerating and vice-versa?

Better take the weight to keep it simple, so more weight can manage more camber vice versa. So AMG GT3 (front engine) more like -4/-2,5, the Audi GT3 (mid-engine) -3,5/-3 and the Porsche might even happy with -3/-3,5. But it gets more tricky with the aero. The more downforce, the more camber as well, because downforce adding weight. So when you run a low-downforce setup, you might want to decrease the camber evenly, so maybe -3/-1,5 for the AMG plus decreasing the rear ARB for less oversteer at Monza.

And the weight balance of the car is important for the aero-balance as well. A front-engine car wants more rear aero and I usually run 1/8 with the AMG (or 0/3 at Monza) and 1/5 with the Ferrari and other mid-engine cars. With more weight from the engine, you don't need that much aero-weight on top.

 

[Bruno Iwanczuk]

Better take the weight to keep it simple, so more weight can manage more camber vice versa. So AMG GT3 (front engine) more like -4/-2,5, the Audi GT3 (mid-engine) -3,5/-3 and the Porsche might even happy with -3/-3,5. But it gets more tricky with the aero. The more downforce, the more camber as well, because downforce adding weight. So when you run a low-downforce setup, you might want to decrease the camber evenly, so maybe -3/-1,5 for the AMG plus decreasing the rear ARB for less oversteer at Monza.

And the weight balance of the car is important for the aero-balance as well. A front-engine car wants more rear aero and I usually run 1/8 with the AMG (or 0/3 at Monza) and 1/5 with the Ferrari and other mid-engine cars. With more weight from the engine, you don't need that much aero-weight on top.

I don't know why, but to reach the most equal outer, middle and inner tyre temps i'm having to set camber to lowest setting in GT3 cars.

For the Ferrari i use 1.5 front / 1.0 rear

Porsche 2.5 front / 1.5 rear

And even this way i'm still getting 2 or 3 degrees hotter inner temps.

 

[Emery]

Don't measure tire temps "overall" or when going down a straight, pay attention to what they're doing in the corners.