What the percentage means on the details of the car?

I will say front 48% for example.

The percentage represents weight distribution. In the case of your example, 48% front means that 48% of the vehicle’s weight resides in the front half of the vehicle. Thus, a 48% front vehicle has 52% of its weight in the rear half of the vehicle.

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Thanks. Man so I will need to use that as example to tune or no?

Yes and no. Having an even weight distribution, like anything, is largely based on preference; however, having a strongly biased weight distribution can adversely affect the vehicle’s stability and could force you to make adjustments to other aspects of the vehicle to meet your driving style.

Nicely explained - although it means that 48% of the weight is bearing down on the front wheels, not that front half of the car accounts for 48% of the weight. It can be very helpful for tuning.

Shadow hit the nail on the head.

I hit my hand with the flippin’ hammer!

Does that number change as you use up fuel? I would guess the half with the fuel tank gets lighter and lighter as the race goes on in sim mode. Does it?

I would assume in the game that the amount of fuel makes no difference. In real life it would make a small difference, fuel is about 6lbs per pound, so for a 25 gallon fuel tank it would only be a difference of 150lbs between full and empty. The fuel tank is also usually located between the axles so it would not really effect the weight distribution.

It would be interesting to know if Forza actually simulates fuel depletion from a weight perspective. Since there are no scales in the game to verify, we have to defer to the programmers for that answer.

In real life - It’s yes and no.
The fuel tank on the Panoz holds 25 gals x 7 lbs / gal or 175 lbs FULL and sits right on and a little aft of the rear axle. So as fuel depletes, the balance shifts forward a bit. The car is pretty close to 50-50 with a full tank.
In the Corvette (C6) the 20 gal fuel tank is just behind and somewhat “below” the cockpit and in front of the rear axle. The C6 is nearly 50-50 and depletion of fuel in this location would have a lesser effect.

BTW both of these vehicle achieve 50-50 because they are “front mid-engine”. IN both vehicles the forward edge of the engine is directly above the front axle - putting the majority of weight behind the axle. In the case of the Corvette (C6 and C7), to further evenly distribute weight, the transmission is at the rear axle instead of attached directly to the engine.

In real life i would say yes but not in this game. The reason i say this is because you dont know if it has fuel in the car with or with out those percentage numbers.