Rhythmic tail wagging at high speed

[varunaX]

Has anyone ever had their erevo's rear sway back and forth at high speed? almost as if a dog was wagging its tail back and forth if you know what i mean. its not slow, but not fast either, but it makes it impossible to control at high speed.

i have done the following troubleshooting:

- its not steering slop, as it still drives in a straight line
- tires are new and balanced
- dogbones are new and not bent
- wheel wobble is as good as i can get it
- tsm is off
- happens on 4s as well as 6s
- diffs are rebuilt with oil

[grizzly03]

How is your wheel alignment? Toe-out can cause sway issues.
http://www.competitionx.com/rc-tuning-toe-in-toe-out/

[olds97_lss]

How is your wheel alignment? Toe-out can cause sway issues.
http://www.competitionx.com/rc-tuning-toe-in-toe-out/

For bashing, I usually have a little toe-out on the front of my trucks. Makes them less "twitchy". With zero toe in/out, they wander pretty bad. With toe-in, they are more sensitive to input which makes them too twitchy for someone like me. A lot of either will sap away speed, make them harder to drive and chew up the tires when driving on concrete.

I usually run my rear tires straight or a hair of toe-in if it's adjustable.

I'm not sure what camber does, but I try to run my with zero (straight up/down) camber.

[Acidic01]

Are the wheel nuts on tight?

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[grizzly03]

For bashing, I usually have a little toe-out on the front of my trucks. Makes them less "twitchy". With zero toe in/out, they wander pretty bad. With toe-in, they are more sensitive to input which makes them too twitchy for someone like me. A lot of either will sap away speed, make them harder to drive and chew up the tires when driving on concrete.

I usually run my rear tires straight or a hair of toe-in if it's adjustable.

I'm not sure what camber does, but I try to run my with zero (straight up/down) camber.

Fronts are personal preference. Some like toe-out and others toe-in. I run mine with a very small amount of toe-in in both the front and rear and I like how it handles. But toe-out in the rear wheels can cause what the OP is experiencing.

For camber I have mine with a small amount of negative camber in the front. And none in the rear. It seems to help with the predictability of the steering.
http://www.competitionx.com/rc-tuning-camber/

Also you can try changing your caster. It will help with the "twitchy" steering.
http://www.competitionx.com/rc-tuning-caster/

Also if the bump-steer isn't setup right that can cause "twitchy" steering also.

[varunaX]

thanks. i run 0 toe in the front, little toe in on the rear. my wheels are on tight.

my steering is okay, as it does pretty much run in a straight line. on its back, i dont have any chassis shake either, it feels very solid. however when my throttle hits 75%, it starts to wag back and forth. its really frustrating, cause ive replaced everything i thought i'd need to to resolve it.

i was just curious if anyone had ever experienced the same thing and could say 'oh its because of x'

[grizzly03]

Do you use the Traxxas BT Link? If you do it can be overlooked that the TSM setting is still on.

Also what are you running on. Off-road or on pavement? Your sway could be the tires ballooning.

[varunaX]

yep i have the bt link. with tsm on i notice it more. i run on pavement. ive tried it with belted trenchers, and the sway is 10x more than with the 2.0 talons. so i dont think its ballooing, but more something to do with the weight, momentum, of the car at high speeds. ill try and get a video next time im out

[Smashem77]

I have noticed this I think it is the tsm


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[Darth Beavis]

I have a similar problem with my 1/16 Rally. Those tires are hard, so I don't think it's ballooning. I'll be watching for solutions.

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[Smashem77]

I’ve noticed with 100k fluid in my diffs it dose not happen much


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[Darth Beavis]

Next diff will get 100k, then.

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