I read about "packing" a Kyosho AWD gear diff using Kyosho 15k diff gear grease. I have always liked the stock AWD gear diffs but disliked how fragile they can be, especially for racing. One hard bump, or crash, and a gear diff's internals can get destroyed. I've read some guys though like using a gear diff up front and a Kyosho (Or other brand) Ball Diff in the rear.
>What does "packing" the AWD gear diff with say 15k Kyosho diff gear grease do for performance? Does doing this help "strengthen" the gear diff and/or prevent the internal gears breaking under aggressive driving, i.e. racing?
>What weight grease is optimal? Is 15K a good medium?
>How much grease is enough? I'm not familiar with "packing" a gear diff. I read back in the day that using gear diff grease was frowned upon by track owners because the diffs would eventually leak some, get on the track, and make a mess. Is lightly-packing a gear diff an option for leakage prevention?
Sometimes running gear diffs in the AWD is great and the performance is there. I remember someone on here who was a top racer ran front+rear gear diffs and had great success. If "packing" grease into gear diffs is a solid option I would like to hear more about this and from you guys who run gear diffs on their AWD's (Front/Rear/Both).
i run stock gears on my stock car and ball diffs on my mod car. mainly because the mod car breaks the rear diff i pack the rear diff with kyosho 5k grease and the front with 15k kyosho grease. thicker grease settles the car down more so running thicker grease in the front keeps the steering smooth and gives a little push on exit. one thing that i have not tried yet is too actually boil the diff in water for probably 5 or 6 minutes and i know from experience that that will soften the gears up a bit and maybe keep them from breaking. i just havent tried it yet on a mini z.
just coat the bevel gears on each side and that is enough, it will spin off the excess anyway
__________________
MantisWorx www.rcshox.com
professional RC products
Location: Miami FL./ Sto Dgo, Dom Rep.(The Jungle)
Posts: 1,867
Quote:
Originally Posted by MantisMMA
i run stock gears on my stock car and ball diffs on my mod car. mainly because the mod car breaks the rear diff i pack the rear diff with kyosho 5k grease and the front with 15k kyosho grease. thicker grease settles the car down more so running thicker grease in the front keeps the steering smooth and gives a little push on exit. one thing that i have not tried yet is too actually boil the diff in water for probably 5 or 6 minutes and i know from experience that that will soften the gears up a bit and maybe keep them from breaking. i just havent tried it yet on a mini z.
just coat the bevel gears on each side and that is enough, it will spin off the excess anyway
Hi MantisMMA
In rank to soften diff grease or any petroleum-based grease it is better to go with purified linseed oil or any oil paint thinner than water, water will eventually separate. Mix them together to the consistency of your preference and then pack the diff about 75% to 85%.
Cheers
you would never be able to do that consistently. just go with the kyosho diff grease. coat both of the bevel gears and that will be good enough. too many other variables come into play doing it that way
__________________
MantisWorx www.rcshox.com
professional RC products
Tamiya Antiwear grease is good for keeping the the diff from unloading too fast when the inside wheel lifts off in a turn.
Hi Slipstream
You have any links or pictures on what is being shimmed in the gear diff for the AWD. Currently I run ball diff on two of my AWD but the bone stock one i am running the gear diff. I actually prefer the gear diff but I've broken so many already that I learned to run with the ball diff. I would like to keep my stock car with a gear diff set up and not worry about breaking them. Any pictures would help.
Thanks
__________________
Philip Vincent
"Nearly all men can stand adversity, but if you want to test a man's character, give him power." - Abraham Lincoln
I'm sure there are better people to describe the effect but I'll give my impressions of how a gear diff affected my AWD:
I found that a dry gear diff in certain driving conditions (brake then accelerate out of tight corner for example) would sort of load up tension from the braking action and then release it all at once upon acceleration. Sometimes it would cause a the rear to step out or unload harshly.
Instead of going straight to a ball diff I used some light grease in the gears to soften the action...it made the diff actin a little more progressive in it's transfer of power.
I didn't have my AWD long enough to give you an opinion about front/rear or both diffs. Once I switched to SAS and had a rear ball diff I found myself getting confused as to what my tuning issue was because I couldn't make the car work well at all...I sold it and called it quits on AWD.
I don't think you could put enough grease in a Kyosho gear diff to ruin someones track.
__________________
I wonder what rocket scientists say to their coworkers when one of them doesn't get it?
[03/22/17] MZR was on vacation, didn't... : All kidding aside, the host experienced a bit of a server meltdown last week and efforts to restore the site to a new server took longer than anticipated.
The current server is temporary until - more»
[11/25/15] Did You Hear? Our Black... : Hey Racers,
We're getting started a bit early with our Black Friday sale this year. Generally we're not supporters of retailers opening early on Thanksgiving, but in our case, we're - more»
[06/30/15] shop.tinyrc.com: Have You... : Hey All!
Just a quick reminder to everyone that we post all of our shop.tinyrc.com Newletters here on the MZR Forum. If for some reason you miss them in your email inbox, you can always see the - more»