Why Does....

[Ferrari_1996]

The Gillet Vertigo have a better power to weight ratio but the Sauber S9 has more Performance Points.

 

[Secretone]

You almost answered your own question..
Performance Points is based on a number of things, not only power/weight ratio.

 

[TenEightyOne]

Probably because the Gillet Vertigo is basically a road car with aero mods added afterwards whereas the C9 is an aero-bodied race-only car from a higher class.

Power isn't everything

 

[Ferrari_1996]

You almost answered your own question..
Performance Points is based on a number of things, not only power/weight ratio.

What other things is Performance Points based on?

 

[TenEightyOne]

What other things is Performance Points based on?

The primary difference in this case will be the PP added by downforce. The whole body of the C9 generates downforce in addition to the values that you'll see in the setup screen.

 

[georgiebest]

No way

 

[NFSCARBON1]

Power, Weight and Aerodynamics factor into PP. Thats why the PP of a car goes up when you add a wing. Power/Weight stays the same (IRL the wing would add a couple of kg's but not enough to effect the performance) but downforce increases.

 

[georgiebest]

The whole body of the C9 generates downforce in addition to the values that you'll see in the setup screen.

Can someone confirm this for me?

 

[NFSCARBON1]

Can someone confirm this for me?

It has a ground effect floor and a rear diffuser that generate downforce underneath the car. The actual bodywork has small vents and vanes that also provide small amounts of downforce.

If you want to see what ground effect is, get a hosepipe with a flat end and turn the tap on. Place it on a smooth surface and the force of the water should suck the end of the pipe to the floor. The shape of the cars underside speeds the air up (like the pressure of the water) and sucks the car to the floor as it leaves the back through the diffuser.

 

[georgiebest]

I understand the principals of downforce...My question was if the cars in GT have a downforce that is not shown in the set-up options where you alter the downforce?

 

[TenEightyOne]

I understand the principals of downforce...My question was if the cars in GT have a downforce that is not shown in the set-up options where you alter the downforce?

If they're a downforce bodied car then yes. This includes LMPs and the F1-type cars.

 

[NFSCARBON1]

I understand the principals of downforce...My question was if the cars in GT have a downforce that is not shown in the set-up options where you alter the downforce?

As TenEightyOne says, yes. The set up options change front splitter/wing angles and rear wing angles.

 

[SlyckTires]

If it's the body of the car itself creating the downforce, then you won't be able to change it, since you can't change the shape of the body.

 

[SoCal Senator]

Either it comes with an aero package or you install it to change downforce settings. Remember to adjust height upwards (adjustable suspension) on rough tracks or if you use a lot of curbs.

 

[TenEightyOne]

Either it comes with an aero package or you install it to change downforce settings...

Not possible with the body downforce component.

 

[georgiebest]

Well if the physics in the game is correct, then lowering the ride height should also increase down-force. That is fairly standard physics, the less gap there is between the car and road, the less air there is in that gap. The less air in that gap, and the faster that air is moving, the lower the pressure in that gap, and the more "suction" there is to the road.

 

[Sohvakettu]

I remember to have read that on flat bottomed cars rising the rear end slightly compared to the nose also adds a small downforce effect. propably doesn't work with GT5 though.

(IRL the wing would add a couple of kg's but not enough to effect the performance)

I think the weight effect of the downforce is sometimes counted even in hundreds of kg's (ofcourse this depends on the speed)

Edit: "In general terms a Formula 1 car travelling at 150 mph (240-ish km/h) will generate around 1600kgs of downforce." This was in 2004...

 

[NFSCARBON1]

I remember to have read that on flat bottomed cars rising the rear end slightly compared to the nose also adds a small downforce effect. propably doesn't work with GT5 though.



I think the weight effect of the downforce is sometimes counted even in hundreds of kg's (ofcourse this depends on the speed)

Edit: "In general terms a Formula 1 car travelling at 150 mph (240-ish km/h) will generate around 1600kgs of downforce." This was in 2004...

But downforce doesn't effect power/weight as the mass doesn't increase. Drag will effect acceleration, but not the power/weight ratio.