My Jammin X-1 CR conversion

hi, just a quick question. what did you do to modify the center diff? just curious. i noticed with the instant power of the brushless system it onloads the front tires and then the power is gone waisted on the tires spinning in the air.

thanks

[rschoi_75]

Hi, try some heavier oil in your center diff. It will prevent the front from unloading like you describe.

yeah i tried a lot of different weights in it. the heaviest oil i have found is the kyosho 500,000wt. it helped and im sure in a race scenario it would be a lot better. i just bash though so i went back to forward only and it wheelies more which sucks as far as trying to keep it on the ground, but i did quit splitting the front tires. thanks for the tip though

[Arct1k]

30k traxxas oil does the job for me...

yeah that had nothing for me. like i said i used 100k oil and then 500k fluid and it didnt do much better. it is brushless on 5s though

[rschoi_75]

what's your rear diff filled with?

also, maybe reduce the start-up power some how? what esc are you using?

[Hydrodancer]

It sounds to me like the oil your running is too thick. The rear is getting full power and is causing your front end to lift and unload. If you thin out the oil the front wheel will stay more planted and pull the buggy through corners.

The only other options are to lighten up on the lead finger or move/add weight to the front to keep it down.

Originally Posted by rschoi_75

edit: hey guys, I got a quick question for the neu owners. Are your motors really loud at start up? Mine is extremely loud at start-up, but then gets quiet as the rpm's go up. At first I assumed it was just my mesh, since the noise comes from the pinion/spur area. But after checking it, I found it was fine. The buggy runs very smooth at both low and high speeds (powerful too!). Nothing is binding, warped, or loose, and everything runs fine. Its just very loud at the start. I can't seem to figure it out. Anyone got a suggestion?

That "noise" you mention is (if it's what I think it is) the gear mesh slapping when the neu flips between each of it's poles at low speed. The magnets are so strong, once the rotor makes it past a pole, it quickly spins to the next pole faster than the gears are spinning when at running at very low speeds. Had me confused for quite some time. In fact, you can roll it while it is turned off and start to hear the effect. You may notice if you pull back on the truck while pushing it (if this makes sense) such that is is rolling against a constant force, the noise goes away since the mesh is alway help in contact. Least this is what I found on my 1515 2.5d.

grammar edit: the mesh is always held in contact.

[rschoi_75]

Yeah, that's what I figured. Thanks cadima. much appreciated.

[rschoi_75]

A little update....

I recently got the jammin pbs conversion for my buggy. It feels like I've gained some more steering which is always helpful. The quality of the parts are very nice as well.

[rchippie]

I thought about getting this conversion kit fot my jammin. But i was'nt realy sure it would make a difference. My buggy seems to have a lot of steering with the original setup. your buggy looks great .