R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Electric On-Road

Reply
 
Thread Tools Search this Thread
Old 03-02-2010, 01:02 AM   #1
Tech Regular
 
Join Date: Feb 2010
Posts: 285
Trader Rating: 3 (100%+)
Unhappy Ball differential VS Gear differerential

Anybody used ball differential b4? Wat are the noticeable differerences? is ball one lighter? but i heard tat tiny sand can get into the ball bearings of the ball differential. . .

Last edited by jiewei1987; 03-03-2010 at 04:21 AM.
jiewei1987 is offline   Reply With Quote
Old 03-02-2010, 01:11 AM   #2
Tech Regular
 
P.I.M.P's Avatar
 
Join Date: Jul 2009
Posts: 464
Trader Rating: 14 (100%+)
Default

Hi Im a fan of the gear diff after using one in a serpent s400 it had a great feel to the car the only thing is there got more mass then a ball diff and the gear diff is harder on belts but if I could get a gear diff for my t3 I would
__________________
Vbc wildfire D06
clinton livingstone
P.I.M.P is offline   Reply With Quote
Old 03-02-2010, 12:02 PM   #3
Tech Elite
 
WheelNut's Avatar
 
Join Date: Jan 2003
Location: Edmonton, Ab
Posts: 3,210
Trader Rating: 5 (100%+)
Send a message via MSN to WheelNut
Default

If you are driving in dirty parking lots use your gear diff, or if you aren't racing at all use the gear diff. If you are racing the ball should be lighter and smoother. On a race track you shouldn't have to worry to much about dirt getting into the diff, since it should be clean.
__________________
•Brad Comis
WheelNut is offline   Reply With Quote
Old 03-02-2010, 12:15 PM   #4
Tech Master
 
Join Date: Apr 2008
Location: Christchurch, NZ
Posts: 1,063
Default

Ball diffs are the only choice for on-road racing. You are right, gunk does get into them, so you need to strip them periodically and rebuild them.
Gear diffs are just heavy, and usually not adjustable. The ball diff can be finely adjusted.
__________________
Agama A8 Evo | GRP .21 | Spektrum | Savox

My car just hit 88mph. I hope it comes back soon....
JR007 is offline   Reply With Quote
Old 03-02-2010, 03:27 PM   #5
Tech Fanatic
 
akura2's Avatar
 
Join Date: Feb 2006
Location: Paramount, CA
Posts: 810
Send a message via AIM to akura2 Send a message via Yahoo to akura2
Default

The only thing I like about gear diffs is that you get instantaneous power to the ground... ball diffs may have a tad bit of slip to them in a high-powered application... I saw a video of a comparison test between 4WD buggies... one with a ball diff and one with a gear diff.... both set p pretty identically, and both running off the same transmitter... the gear diffed buggy was noticeably quicker off the line, and would even wheelie on occasion....

I like the instant adjustability of the ball diff, whereas a gear diff has to be adjusted by using different weights of diff grease... and it's not an exact science
akura2 is offline   Reply With Quote
Old 03-03-2010, 04:25 AM   #6
Tech Regular
 
Join Date: Feb 2010
Posts: 285
Trader Rating: 3 (100%+)
Post

wow.. seems like u guys know alot abt differentials... one thing i still curious.. when the ball differentials are adjust, will the adjustments come loose after sometime?
jiewei1987 is offline   Reply With Quote
Old 03-03-2010, 10:07 AM   #7
Tech Elite
 
niznai's Avatar
 
Join Date: Feb 2009
Location: All over the place
Posts: 2,940
Default

Quote:
Originally Posted by akura2 View Post
The only thing I like about gear diffs is that you get instantaneous power to the ground... ball diffs may have a tad bit of slip to them in a high-powered application... I saw a video of a comparison test between 4WD buggies... one with a ball diff and one with a gear diff.... both set p pretty identically, and both running off the same transmitter... the gear diffed buggy was noticeably quicker off the line, and would even wheelie on occasion....

I like the instant adjustability of the ball diff, whereas a gear diff has to be adjusted by using different weights of diff grease... and it's not an exact science
I think you're referring to the Durango vs something else that eludes me right now. If I remember correctly however that was a test run on an offroad track where grip will determine which car is quick and which is not. I would like to see that test run on a high grip on road surface. A balldiff can be tightened until it behaves like a spool if you really wanted albeit it will increase understeer. Gear diffs will suffer the same effect as you increase the oil viscosity.

Quote:
Originally Posted by jiewei1987 View Post
[...]
when the ball differentials are adjust, will the adjustments come loose after sometime?
Not if you're building them correctly. They do wear out and then they will undoubtedly be out of adjustment, but you can readjust as needed without rebuilding.

Quote:
Originally Posted by JR007 View Post
Ball diffs are the only choice for on-road racing. You are right, gunk does get into them, so you need to strip them periodically and rebuild them.
Gear diffs are just heavy, and usually not adjustable. The ball diff can be finely adjusted.
If you use some good diff covers you can avoid completely the issue of dirt getting in.

That leaves the main advantages of the balldiff which are adjustability, accesibility and lightness.

That being said, you need to rebuild your diffs because they wear out but I would imagine gear diffs need some maintenance too. Ceramic balls and good diff plates can go a long way towards spacing out the maintenance intervals on a balldiff.
__________________
Team Greasy Weasel

The best upgrade to any car is some driver skill.
niznai is offline   Reply With Quote
Old 03-04-2010, 10:19 AM   #8
Tech Rookie
 
Rozzer's Avatar
 
Join Date: Jan 2010
Posts: 12
Default

If you use a ball diff and it slips when you put down the power, it needs tightening. Ball diffs give you far more control over your car's setup
Rozzer is offline   Reply With Quote
Old 03-04-2010, 01:40 PM   #9
Tech Champion
 
RC MARKET's Avatar
 
Join Date: Feb 2007
Location: HK
Posts: 6,172
Trader Rating: 12 (100%+)
Default

Hk many driver & user used 2 years ago,
Cyclone , T2,008/9 , T3 , BD5 TRF416 ... all changed ,
TOP final test now !

used gear diff off power can support more turn & on power more punch !
don't need keep rebuild , test silicone oil only !
RC MARKET is offline   Reply With Quote
Old 03-04-2010, 01:42 PM   #10
Tech Champion
 
RC MARKET's Avatar
 
Join Date: Feb 2007
Location: HK
Posts: 6,172
Trader Rating: 12 (100%+)
Default

but if on power over rear side will had some spin !
RC MARKET is offline   Reply With Quote
Old 03-05-2010, 01:03 AM   #11
Tech Regular
 
Join Date: Oct 2005
Posts: 306
Default

I prefer gear diff for its predictability.. smooth throttle needed all the way,,
__________________
LOS XXX-S G+
TAM TA-05, TL-01, FF-02, TL-01M, M-04M
ASSO TC3FT, RC12L3, RC10L3
Faiz is offline   Reply With Quote
Old 03-05-2010, 02:27 AM   #12
Tech Champion
 
RC MARKET's Avatar
 
Join Date: Feb 2007
Location: HK
Posts: 6,172
Trader Rating: 12 (100%+)
Default

easy to make !
RC MARKET is offline   Reply With Quote
Old 03-05-2010, 04:44 AM   #13
Tech Champion
 
Join Date: Feb 2003
Location: Sydney, Australia
Posts: 5,310
Trader Rating: 1 (100%+)
Default

If you can use a gear diff on your chassis I believe you are mad not to. Yes they weigh a bit more but they are consistent and smooth at all times. A more serious racer could have two or three units ready to run at all times with different settings for the ultimate in performance.
__________________
Blade: Andro Treiber H 79g AN
FH: Donic Bluefire M3 Max Blk
BH: Donic Bluefire M2 Max Red
Powered by Falco
Dragonfire is offline   Reply With Quote
Old 04-18-2010, 09:53 PM   #14
Tech Adept
 
William "Q"'s Avatar
 
Join Date: May 2008
Posts: 154
Trader Rating: 2 (100%+)
Default

I had a Losi XXX BK2 and 4wd Kyosho Lazer I loved both cars but the ball diff rebuilding I hated due to the lack of getting them right every time. As soon as I found out AE had the B4.1 I sold both the BK2 and Lazer. The gear diffs to me are a God send. Gear diffs are easy to maintain and to me more reliable. I want to buy a 4wd electric buggy with gear diffs but it seems Durango is taking forever to release their cheaper version of the 2, electric 4wd buggys. I'm hopeing AE will make a B44.1 since they did the B4.1 and T4.1. Does anyone know when Durango is going to release their buggys?

Last edited by William "Q"; 04-18-2010 at 09:56 PM. Reason: Wanted to ask durango buggy release question.
William "Q" is offline   Reply With Quote
Old 04-19-2010, 08:29 AM   #15
Tech Elite
 
razzor's Avatar
 
Join Date: Aug 2005
Location: Durban, South Africa
Posts: 2,810
Default

Having seen how much hassles guys have with ball diffs in the mod class and plenty of DNF's the gear diff is and would be a welcome alternative.
Local Serpent distributor finally got some gear diffs and its night and day for reliability and ease of or lack of maintenance needed for it.
Hoping he gets some more soon so i can make it fit my TOP.
__________________
Casterracing ZX1.5R
casterracing EX-1 Pro, SP Silver Arrow
TOP Racing Scythe, SP 17.5, SP GT Pro 2.0
TOP Racing Scythe, SP 4.5 V2, Hobbywing Xerun 120SD 2.0
TOP Racing Scythe, SP 13.5, Hobbywing Xerun 120SD 2.0
razzor is offline   Reply With Quote
Reply


Tags
ball differential


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 04:07 AM.


Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net