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Old 11-10-2008, 11:14 PM   #1
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Default 4wd mod weight limit

This class suffers because of the durability of these cars. With lipos and 380 sized bl systems you could easily bring these cars down to 1250 grams w/out batting an eye. You can still set up 380 size systems to lay down 250 watts of power w/out any worry while still running a wicked quick car. Now, you ask what does this do for you? Well, the car would now weigh about 4/5th of it's original weight which means that impacts would cause 20% less stress on the parts & there would be 20% less wear on the parts. The car would be 20% lighter so it would accelerate under full throttle as though you were using a 300 watt motor instead of that 250 watt motor. The last time I checked the average driver doesn't need a 300 watt motor in off road & the average 4wheeler drives really well w/ less weight.
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Old 11-11-2008, 11:51 AM   #2
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You are right, lower weight will help reduce parts breakage.

Interesting idea you have, reduce weight but keep "power to weight ratio" the same by:

1. going to a lighter 380 size brushless system
2. Lighter LiPo vs NiMH.

Very cool but do the real weight and power calculations work out?
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Old 11-11-2008, 12:36 PM   #3
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Sometime you just need weight to keep the car on the ground... My truck is too ligh with brushless and lipo it goes wheelies every burst acceleration. I ended having to stick 80 gram of lead in front to keep some steering
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Old 11-11-2008, 01:06 PM   #4
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Yes, weight distribution and high center of gravity are the keys to your problem with wheelies.

Quote:
Originally Posted by Mister-T View Post
Sometime you just need weight to keep the car on the ground... My truck is too ligh with brushless and lipo it goes wheelies every burst acceleration. I ended having to stick 80 gram of lead in front to keep some steering
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Old 11-11-2008, 02:10 PM   #5
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Durability in 4wd is a bit of an urban myth, caused by some cars from the past (*ahem* XX-4) needing constant repairs.

Many of the current breed of cars are very tough. Towers and arms break no more often than 2wd cars.

And I agree with the above - weight does help the cars to an extent. They are more settled and ride better, yet don't seem to lose out on pace now that we have a surfeit of power available.
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Old 11-11-2008, 02:18 PM   #6
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You can make your car lighter all you want...It will never handle as well as a heavier "current" chassis. The key everyone glosses over when reducing weight is the Sprung mass to Unsprung mass ratio. All the weight you are talking about removing is sprung mass which is all good and fine, but unless you remove unsprung mass as well the car will lose handling.
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