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Whenever a vehicle has force applied to it, there is going to be some side-to-side or front-to-rear movement as weight is transferred from one area of the chassis to another. As a car enters a corner, for example, weight is transferred to the outside front wheel, causing the suspension to compress. The amount of weight transferred is partially dependent on the distance between the ground and the vehicle's center of gravity; the lower the CG, the less weight is transferred, and vice versa.
Generally, transferring less weight is desirable, since it allows for the greatest stability and predictability as a vehicle makes its way around the track. Less weight transfer also means that a vehicle's suspension returns to its normal state more quickly, also making for a better driving experience.

Receiver Packs: Instead of using hump packs in your nitro cars and trucks, try using flat side-by-side packs, and mount them as low as possible in the chassis. If you use a zip- tie to anchor the pack to an upper chassis plate, you can use a lightweight piece of foam or similar material to offset the pack so it can ride lower.
Battery Hold-Downs: Ditch those battery holders and use strapping tape to anchor your packs down. You'll be able to shave some weight off of your vehicle, and your pack will sit as low in the chassis as it possibly can. Plus, there is less chance that the battery will move during a run if it is taped down.
Transponders: If you are racing at a track with a computer-controlled lap counting system, chances are that you run a transponder in your car or truck. Instead of punching a hole in the body and letting the transponder hang there, use a piece of scrap Lexan or plastic to make a transponder mount that sits as close to the chassis as possible. Put it as far forward in the vehicle as you can, in case you ever end up in a side-by-side race to the line!
Electronics and Radio Gear: Try to get as many of the electronics sitting as low in the vehicle as possible. It's tempting to do things such as mounting a receiver on a car's upper deck, but you'll be losing out in the long run. Take the time to wire things cleanly, and keep your gear sitting flush with the chassis whenever you can. If you do have to run motor and battery wires, keep them as short as possible, and run them under things rather than over things wherever you can.
Body Paint: Don't go overboard when you're painting a body, since the weight from unnecessary coats of paint can add up faster than you might think. The body's weight will always be at the highest point from the ground, so you want the lightest paint coverage on the roof.
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