Atomic High Precision Ball Differential

[patrick38]

hi there

wich one off ball diferential do you people like the most ??
kyosho ore the atomic one ?
hope too hear from you
newbie waiting for his dnano

[Marcro]

I'm glad I read this before splurging. I was going to pick this up along with their disc damper set. Thank you for this review and I hope a V2 comes out soon.

[MrNanoTrax]

kyosho's ball diff is fine... only thing i'd recommend is replacing the stock spacers with thinner washers to allow for more adjustment since the "1" plate setting is worthless

[Jellis]

I thought it was kind of a toss up between the 2 diffs mening they both had there own set of proplems. I'm a machinist by trade so I didn't have any proplem fixing either diff.

The kyosho diff was easy to fix I fully compressed the spring 40 or 50 times to take some of the tension out. Then I found that armature spacers from a slot car motor are an exact replacement for the thick plastic stock shims and they come in various thicknesses .020",.010", .007", .005" for and almost infinate adjustment. If you have a local slot car track (good luck) they should have them in stock.

The Atomic diff had many more problems 1. Adjuster nut and spring hit axel housing, 2. LR drive hub hit axel in center of hub, 3. Gear very loose on hub ( I havn't fixed this yet), 4. Gear seems to be a different pitch than pinion.

1. I fixed the axel housing by reaming it larger I think a drill bit might crack the housing. Also be carefull to make is just smaller than the bearing diameter so the bearing has a lip to set against. I also changed the aluminum nut to a nylon lock nut that I machined round, Drilled a hole in the side of it and made a slot in the axel housing to adjust it without removing the axel.

2. I machined the LR hub back there was alot of material and this didn't hurt anything

3. I havn't fixed the gear on the hub yet

4. I have been running the gear with the stock pinion and other than a little bit of noise I havn't had any problems but may seem a little bound up even with a good gear lash

I did a back to back test of both diffs last weekend 100 laps each taking out the worst 15 laps for my crappy driving.

The atomic diff was first with an average lap time of 4.79 and a fast lap of 4.41

The kyosho diff was a little faster with an average lap time of 4.61 and a fast lap of 4.23

I know some of this was covered in other posts but you know the saying everyone has an opinion and something something .........

[arch2b]

could you share pictures of your modified atomic diff?

[Jellis]

Arch it dosn't look any different than the stock diff

[arch2b]

i'd like to see the milled changes made

[MrNanoTrax]

Originally Posted by arch2b

i'd like to see the milled changes made

co-signed... pls post pics!

[Jellis]

Sorry guys I've removed all my atomic diff's and replaced with Kyosho. My 962 had an atomic diff in it and it always seemed like a dog I changed the motor thinking that was it and it only got a little better. I finally broke down and put a kyosho diff in it and its a rocket ship now so no more atomic ball diff's for me unless they fix all the problems.

Anyone want to buy any atomic ball diff's LOL Cheap I have 4 of them

[Jellis]

I also did a post a couple weeks ago about the 2 diff's back to back in my lambo but the improvement wasn't so drastic.

The Kyosho diff with the proper shimming is in my opinion way better than tne atomic I would even say that on the HTUSA track it's worth at least .3 sec. per lap

If anyone needs help finding the slot car motor shims that fit the axel maybe I can help but please check for a local slot car track first

Thanks
Joe

[Jellis]

I meant to add the guy that raced my 962 last week went from running 4th or 5th in our group to not only winning but won by 2 laps the car was fast...... and all we changed was the diff

[nitrojunkie]

I was there and witnessed the whole deal.The difference was night and day.There was not a lot of time spent on the Kyosho diff either 10 mins tops.

[MrNanoTrax]

i've been messing with the atomic diff and discovered if you sand the containing screw to where its smooth, the diff housing problem is eliminated. also, the RIGHT rear alum. hub needs to be attached just off the bearing to prevent it from restricting rotation (perhaps a shim would work but not sure what to use). now it performs just as well as the kyosho... best time on Circuit F1R @ NanoTrax is 6.62 seconds (Porsche 911 GT3, Kyosho Ball Diff) and i tested the Race Spec Gallardo yesterday with the Atomic Ball Diff and clocked a 6.94 seconds.

[Marcro]

I'm confused as to which differential to buy if any at all.
Almost sounds like the stock unit is best?
I'm not a machinist, and I don't like fiddling around with parts trying to make them work. I am a much simpler plug'n'play type of person. What do you recommend for me?

[MrNanoTrax]

stock diff sucks.... get a kyosho joint, add heavy ball diff oil of your choice and keep it movin