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Old 11-12-2004, 11:49 AM   #1
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Default Long arm, short arm, what's different

It has been confused me for quite a while. Hope anyone has a good answer on that.

Most 1/10GP, the rear lower arm is longer than front lower arm, ex: RRR, FW05, 710, MTX3. The only exception seems be NTC3 (and also, LD3, CD3).

On the other hand, on 1/10EP, most of them have same length on rear lower arm and front lower arm, ex: NTC3, 415, EVO4, Pro4. The only exception seems be Xray T1 (maybe few others?).

So, why the basic geomatric design between 1/10GP and 1/10EP has such huge different? Is that becase the 1/10GP's CG is closer to rear rather than in the middle of wheelbase like most 1/10EP did? So the rear lower arm is longer to deal with heavier rear? Or because other reason?
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Old 11-13-2004, 02:28 PM   #2
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I think it has to do more with da adjustablity of the rear camber more than everything else. The shorter the upper arm, the more camber it would have.
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Old 11-14-2004, 10:20 AM   #3
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But camber only related to the length different between upper arm and lower arm. It doesn't explain the length different between front lower arm and rear lower arm.

I think it could also be something to do with roll-center, since shorter lower arm usually means lower roll-center.
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Old 11-14-2004, 11:31 AM   #4
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its because GP cars are heavier than EP which require more camber gain making them shorter than the fronts of an EP car...
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Old 11-14-2004, 09:04 PM   #5
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most electrics also dont have equal length arm you have to measure length from
inner pivot point to outer pivot point and you will see that even most electrics
also dont have equal length arms. I would guess that gas has a bigger stagger
because gas cars run on different tires (foam tires) also cg and actual car weight is a lot different between the two cars so the geometry and suspension rate
will also be alot different.
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