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Don't understand how solid front axle works in touring but not in buggy

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Don't understand how solid front axle works in touring but not in buggy

Old 10-02-2018, 07:51 AM
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Default Don't understand how solid front axle works in touring but not in buggy

Iím trying to understand the physics of why solid front axle work in touring car but not in any other application. For instance, in most 4wd buggy some sort of gear diff or ball diff are used in the front. By changing the fluid viscosity, you change the on and off power steering characteristics. In 1/8 on-road, one way front axle are used so two wheels can turn at different speed when cornering. So, how does touring car get away with using solid front axle and yet still steer superbly.
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Old 10-02-2018, 08:30 AM
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I'm not a fan of spools in TC cars but I think the reason that the spool wont work on a 4wd buggy is that it is much wider then the TC
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Old 10-02-2018, 09:03 AM
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Touring cars don't jump.

The landing would not be good for the drivetrain.
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Old 10-02-2018, 09:39 AM
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Jumps got nothing to do with it. And slipper clutches exist for that extra stress on the drivetrain.

http://site.petitrc.com/setup/HowToS...-Slipper-1.jpg
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Old 10-02-2018, 09:45 AM
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As a touring car dives into a corner, it transfers weight much harder than a buggy. With the majority of the cars weight on the outside front tire, and very little on the inside tires, the spool ensures that the tire remains connected to the motor so you have control, where if you had a loose diff the outside front tire would "diff out" to the inside tire and would be effectively nearly free-wheeling, so the spool allows control and throttle/brakes to be applied at any point to both front tires. In touring car a front diff can be used reasonably well in low-grip applications, but many drivers have gotten used to the feel and retain spools in every scenario.

Years ago front diffs were used in foam tire touring car, but in that application the car was much stiffer and had considerably less body roll, also the inside front tire was tacky and required very little weight on it to prevent the front from diffing out. Rubber tires would just slip.

In 1/8 onroad, the front one-way or diff and often rear spool setup are more a result of the huge rear tires and side dams on the body, and that the cars run on tracks that almost never involve hairpin turns, so its hard to compare to smaller scales.
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Old 10-02-2018, 10:14 AM
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Very good write up. That explained it very well. Thanks
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Old 10-03-2018, 12:29 PM
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traction......
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