Wraith CMS without panhard

[Jcplante]

I have a home made cms on my 73 bronco and its almost 10lbs with a cheap 120 oz tpro servo and it turns just fine even when stopped. I wonder what is different with my setup? I didn't notice any disadvantages at all with the cms and it looks much more scale. Its only running 1.9 treps tho maybe that is why...?

[Calderwood]

Originally Posted by Jcplante

Sure is! My 1:1 zj trail rig has some mean death wobble that I just can't seem to cure. No fun.

How many degrees of caster do you have? Every 1:1 that I've worked on that had a tight front end and still had death wobble I cured by adding caster.

[Jcplante]

Hmm I have no idea. Lol everything seems tight tho. The rig had the wobble since day one while it was still stock. Now its much worse with the 6 inches of lift and 35s

[Calderwood]

Originally Posted by Jcplante

Hmm I have no idea. Lol everything seems tight tho. The rig had the wobble since day one while it was still stock. Now its much worse with the 6 inches of lift and 35s

If its still on short arms it will need even more caster than with long arms to keep it under control on 6" coils.

[evan03]

5deg?

[alexchen86]

Originally Posted by Dostradamas

It is worth noting (again) Chassis Mounted Servos & pan hard bars are for looks & scale points, not better steering.
Properly set up axle mount will always work your servo less & have tighter, faster steering response.

CMS without panhard is wasting lots of servo power & will have bumpsteer.

Since the Wraith has a plastic chassis and the relative weight is not as heavy as my 11 pound 2.2 Lucifer powder coated steel chassis with aluminum paneling plus a heavy SuperShafty Bombproof Tranny and a huge Holmes 10T Cobalt motor on plus heavy RC4wd TrueScale 2.2's weighted and a full interior on 4s you would not notice THAT much bump steer.

When I ran my Lucifer rig I wanted it as a TTC contentder not knowing that the chassis would be waaay too heavy and it would be more of a bulletproof basher than a comp ready scale rig. I tried 4 link front and rear with CMS.....bad mistake. I tried 3 link front with CMS and 4 link rear bad mistake. I finally tried AR60 axle swap with the intention of setting up a VP panhard mount and securing it to the chassis with 4 link rear and that would have worked with some tweaking.

You have a strong enough servo on that rig the servo will actually shift the chassis side to side before you even engaging a turn. Pan hard is a must if you want a CMS 3 link front end. But yes axle mounted would be ideal for lower COG and overall better and quicker response from your steering input.