What am I doing wrong? Torque twist

[Mudman]

I've tried moving around the rear 4link system between: left up- right down, both link top mounted, both bottom mounted, right up- left down. I can't seem to figure out the twist, if I could get ride of that- surely the car would climb much steeper.

Do you have any suggestions?

Here's a link to the video:

http://www.rccrawler.com/forum/showt...01#post1979801

[Manning]

Preload the left rear spring by adding maybe 1/2" of spacers under the spring. Whatever it takes to keep that spring from compressing during the climb.

Thicker oil in that shock will help a little also.

Been down that road also. Changed all kinds of link positions. The preloading made the biggest difference for me.

[dblrnut]

do the mirror trans mod and overdrive the front or underdrive the rear

[SWelte]

The biggest help is front overdrive. Then adjust preload as needed. Also running as little as possible weight on the axle/tires.

[Reflection]

Overdrive the front will help allot in climbing

Preload,oil and spring rates in the shocks can help allot also.

Dialing in your squat and roll center numbers help a ton.

Equal length uppers and lowers is a big help.

Here's a picture that might help.

[Mudman]

Hi Guys,

What exactly do you mean by overdriving the front?
I'm still a newb and get frustrated easily- watching the car twist so easily after playing with the rear links, almost made me want to just give up on the car.

I've been looking into building up a bully, but that would mean spending more money. I want to make this work somehow spending as little as possible. The car already has enough money into it for now.

[ultimate_monkey]

over drive the front means swap the gears out to somthing higher, so the front wheels spin faster then the rear wheels, this will make the rear wheels be draged up the hill, thus the truck wont want to go over back wards as easily...

i hope that made sence haha

[Mudman]

Originally Posted by ultimate_monkey

over drive the front means swap the gears out to somthing higher, so the front wheels spin faster then the rear wheels, this will make the rear wheels be draged up the hill, thus the truck wont want to go over back wards as easily...

i hope that made sence haha

I just found them on rcp.

Which one do I want? they have both 36/14 and 43/13

[Mudman]

The lower gear range set reduces torque twist (43/13)
The higher gear range offers higher top speed (36/14)

^If I am to overdrive just the front, I'd imagine that would mean to go with the 36/14? I read somewhere that the 43/13 was for the rear... Still a little confused. But the price is right for a quick fix. Which would I get for the front?

[Reflection]

Originally Posted by Mudman

I just found them on rcp.

Which one do I want? they have both 36/14 and 43/13

You can read the description.;) Weather you want to over dive or under drive....your choice.

36/14 description.....
Axial Heavy Duty Bevel Gear Set - 36T - 14T
Fits AX10 Provides over drive for the front axle.


Axial Heavy Duty Bevel Gear



43/13 description....
Axial Heavy Duty Bevel Gear Set - 43T - 13T
Fits AX10 Provides lower gear ratio and reduces torque twist.


Axial Heavy Duty Bevel Gear

[Mudman]

So technically I can go with either? where I can throw the 43/13 in the rear (rear would be slower then front- thus automatically making the front overdrive?), or 36/14 up front (rear would stay stock while front moves faster?) and it would both essentially do the same thing?

HAHA sorry, I'm not the brightest lightbulb.

Originally Posted by Reflection

You can read the description.;) Weather you want to over dive or under drive....your choice.

36/14 description.....
Axial Heavy Duty Bevel Gear Set - 36T - 14T
Fits AX10 Provides over drive for the front axle.


Axial Heavy Duty Bevel Gear



43/13 description....
Axial Heavy Duty Bevel Gear Set - 43T - 13T
Fits AX10 Provides lower gear ratio and reduces torque twist.


Axial Heavy Duty Bevel Gear

[rottenbelly]

You want to run the 36/14 in front. It makes my rear wheels turn 3/4 of a turn to 1 full turn of the front wheels!

Pics from the side of your rig and top would help also!

From the pics i saw it looked like battery was in the back? Move it to the front and put you esc in the back!
You could mount it on the front also if you could find room on your links.
Use a four link plate lightly zip tied to links.
http://www.tcscrawlers.com/Axial-Rac...7-p-16964.html

[Reflection]

Originally Posted by Mudman

So technically I can go with either? where I can throw the 43/13 in the rear (rear would be slower then front- thus automatically making the front overdrive?), or 36/14 up front (rear would stay stock while front moves faster?) and it would both essentially do the same thing?

You could do it that way if that'll give you the gear ratio's you like.

[Mudman]

lol thanks for the helps guys! I'll do the 36/14 up front. If this doesn't fix it, the rig is going be set on fire!

I wonder why I haven't heard of this upgrade until now... Placing an order right now, anything else I should get?

[Mudman]

Originally Posted by rottenbelly

You want to run the 36/14 in front. It makes my rear wheels turn 3/4 of a turn to 1 full turn of the front wheels!

Pics from the side of your rig and top would help also!

From the pics i saw it looked like battery was in the back? Move it to the front and put you esc in the back!
You could mount it on the front also if you could find room on your links.
Use a four link plate lightly zip tied to links.
http://www.tcscrawlers.com/Axial-Rac...7-p-16964.html

did you want the pick front top and side of the torque twist, or just regular stationary?

The battery I'm running, isn't small enough to fit anywhere comfortably on the front.

[Reflection]

Originally Posted by Mudman

lol thanks for the helps guys! I'll do the 36/14 up front. If this doesn't fix it, the rig is going be set on fire!

I wonder why I haven't heard of this upgrade until now...

Don't set it on fire just yet.

This upgrade will help,no 2 ways about it. Do a little digging with the search feature on "anti squat" and "roll center" There's enough info on RCC about this to make your eyes bleed if you read it all. Study it,learn it,then go do a little testing on your rig with different set ups.

With the overdrive gears and proper link geometry,you should see a HUGE difference.

[rottenbelly]

Originally Posted by Mudman

did you want the pick front top and side of the torque twist, or just regular stationary?

The battery I'm running, isn't small enough to fit anywhere comfortably on the front.

Pick from either side. And a shot from directly above or below would be nice !! One of these eagle eyes on here might see a easy fix for ya!!
Have you thought about running some split packs or upgrading to lipo?
Just having that extra weight of the battery up front would be a huge help!!

[Mudman]

Originally Posted by rottenbelly

Pick from either side. And a shot from directly above or below would be nice !! One of these eagle eyes on here might see a easy fix for ya!!
Have you thought about running some split packs or upgrading to lipo?
Just having that extra weight of the battery up front would be a huge help!!

The pack that I run actually is Lipo, 2200mah 35c 7.4v. If it was just a tad bit smaller, I'd be able to run it in the front. But to be honest the battery is super light and doesnt feel much heavier then the servo. I'd rather have the battery mounted in the back at the lowest point, rather than in the front at a higher point.
I don't have a camera with me, but these are the closest I have.

[rottenbelly]

I try not to have anything on my rear axle. I just believe having all the weight towards the front helps. IMO
What is your belly clearance? At first glance it looks high. Just lowering that a 1/4 inch might help. You could make those shocks shorter buy adding a spacer on the inside.

I had my losi shocks down to 3.75 inches.
You might also try spacing out the rear upper links at the axle also.
On my rigs i have had good luck running the rear upper links parallel to the lower links (When viewed from the side) and the front upper links slightly Lower at the chassis Than at the axle.
Just some suggestion.

[Mudman]

Originally Posted by rottenbelly

I try not to have anything on my rear axle. I just believe having all the weight towards the front helps. IMO
What is your belly clearance? At first glance it looks high. Just lowering that a 1/4 inch might help. You could make those shocks shorter buy adding a spacer on the inside.

I had my losi shocks down to 3.75 inches.
You might also try spacing out the rear upper links at the axle also.
On my rigs i have had good luck running the rear upper links parallel to the lower links (When viewed from the side) and the front upper links slightly Lower at the chassis Than at the axle.
Just some suggestion.

Thanks for the suggestions, I had planned on lowering the car actually as well. The belly height is currently at 2.75. I was thinking about dropping it down to 2.5- but at the current height, it clears everything really well.

Let me try the 36/14 up front first to see how much of a change it is, then I'll go from there.

And I appreciate your suggestions, the more the better.