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Originally Posted by Cody
Ideally you'd want to have a heavy object as close to the back seat as possible. The closer heavy objects get past the wheels in the front or the back, the more likely they are to affect handling.
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Originally Posted by sperry
On a car that's about 60/40 f/r weight bias, you *want* weight behind the rear tires because that helps bring the weight bias closer to 50/50 the most. Adding weight over the rear axle, or worse in front of it, doesn't help as much.
The reason battery relocations are usually done to the extreme right rear of the car is so they help the f/r bias the most, as well as offset the weight of the driver on the left side of the car.
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You're both right in principle, it just depends on the car and what kind of course you're going to be racing on. You don't want a lot of weight hanging out beyond the axles, especially when you're going through lots of quick transitions (read: auto-x), because it increases polar moment of inertia and the car won't rotate as quickly. On the other hand, static weight distribution has a huge effect on steady state handling balance and the further back you place a weight the more it will change the weight distribution. This is usually going to be more advantageous for larger tracks (read: road courses), where you're going to be spending time in a lot of relatively long sweepers.
YMMV.
