R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 07-04-2010, 01:18 AM   #601
Tech Apprentice
 
Join Date: May 2010
Location: Sheffield England
Posts: 55
Default

They had a team at the TITC
martynp is offline   Reply With Quote
Old 07-04-2010, 09:25 AM   #602
Tech Elite
 
The Teacher's Avatar
 
Join Date: Aug 2001
Location: Washington, DC
Posts: 4,840
Trader Rating: 48 (100%+)
Default

Anyone heard any news on the gear diff for this car? Hell I haven't even had time to try the roller ball diff....
The Teacher is offline   Reply With Quote
Old 07-04-2010, 11:20 AM   #603
Tech Champion
 
RC MARKET's Avatar
 
Join Date: Feb 2007
Location: HK
Posts: 6,172
Trader Rating: 12 (100%+)
Default

Delay moment will release !
RC MARKET is offline   Reply With Quote
Old 07-04-2010, 11:47 AM   #604
Tech Champion
 
Join Date: Nov 2001
Location: Hawaii, USA
Posts: 7,186
Default

Yeah what's with all these cars these days going to a gear diff? Seems like a step backwards to me.
InspGadgt is offline   Reply With Quote
Old 07-04-2010, 10:39 PM   #605
Tech Elite
 
seaball's Avatar
R/C Tech Charter Subscriber
 
Join Date: Sep 2001
Posts: 4,303
Trader Rating: 9 (100%+)
Send a message via Yahoo to seaball
Default

Quote:
Originally Posted by InspGadgt View Post
Yeah what's with all these cars these days going to a gear diff? Seems like a step backwards to me.
gear diffs can be set looser than a ball diff w/o slipping. additionally, they are more consistent from run to run (especially with high powered motors) as they don't wear like a ball diff does. both of those functions are a step forward. they are probably more consistent over a run (due to less heat buildup) as well. and the idea of running multiple batteries in modified without a mandatory rebuild can be added to the list of positives over a typical ball diff.

a ball diff is a thrust bearing mis-applied by being subjected to a torque load. wasn't ever a great idea, but the weight savings probably made it worth it. that and most r/c guys haven't an engineer's brain, so when they heard you could put more ball bearings in the car... well, that just had to be a great idea.

it remains to be seen whether gear diffs will stay or just be a trend, but i think if designed and built properly, they'll make ball diffs ancient history in ep vehicles as they are in nitro.
__________________
*** The Gate II - Home of Mike Wise ***
seaball is offline   Reply With Quote
Old 07-05-2010, 01:46 AM   #606
Tech Fanatic
 
vabroom's Avatar
 
Join Date: Nov 2003
Location: dark side of the moon
Posts: 936
Default

And the most popular reason right now is most of WC racers had one in their cars. So gear diff makes me a better driver! lol
__________________
RC racing is still trying to prove that two solid objects can be in the same place, at the same time.
vabroom is offline   Reply With Quote
Old 07-05-2010, 01:49 AM   #607
Tech Champion
 
JayBee's Avatar
 
Join Date: Mar 2004
Location: 12TH-MAN COUNTRY
Posts: 6,813
Trader Rating: 31 (100%+)
Default

Quote:
Originally Posted by seaball View Post
gear diffs can be set looser than a ball diff w/o slipping. additionally, they are more consistent from run to run (especially with high powered motors) as they don't wear like a ball diff does. both of those functions are a step forward. they are probably more consistent over a run (due to less heat buildup) as well. and the idea of running multiple batteries in modified without a mandatory rebuild can be added to the list of positives over a typical ball diff.

a ball diff is a thrust bearing mis-applied by being subjected to a torque load. wasn't ever a great idea, but the weight savings probably made it worth it. that and most r/c guys haven't an engineer's brain, so when they heard you could put more ball bearings in the car... well, that just had to be a great idea.

it remains to be seen whether gear diffs will stay or just be a trend, but i think if designed and built properly, they'll make ball diffs ancient history in ep vehicles as they are in nitro.
+1
__________________
R C 3 G R A F I X _ F U S I O N . G R A P H I X _ S E A T T L E - R/C - R A C E R S _ E M E R A L D C I T Y R C . C O M

A E - 12R5.2 _ S M - REV8 PRO
JayBee is offline   Reply With Quote
Old 07-05-2010, 04:16 AM   #608
Tech Champion
 
Join Date: Nov 2001
Location: Hawaii, USA
Posts: 7,186
Default

Quote:
Originally Posted by seaball View Post
gear diffs can be set looser than a ball diff w/o slipping. additionally, they are more consistent from run to run (especially with high powered motors) as they don't wear like a ball diff does. both of those functions are a step forward. they are probably more consistent over a run (due to less heat buildup) as well. and the idea of running multiple batteries in modified without a mandatory rebuild can be added to the list of positives over a typical ball diff.

a ball diff is a thrust bearing mis-applied by being subjected to a torque load. wasn't ever a great idea, but the weight savings probably made it worth it. that and most r/c guys haven't an engineer's brain, so when they heard you could put more ball bearings in the car... well, that just had to be a great idea.

it remains to be seen whether gear diffs will stay or just be a trend, but i think if designed and built properly, they'll make ball diffs ancient history in ep vehicles as they are in nitro.
Oh I understand all that...it's just back when I started out everyone was ditching gear diffs for ball diffs...and now people are starting to go back. That said today's gear diffs are a lot better than what was in cars in the early 90's. Back then they weren't sealed like today so tuning via different thicknesses of oil wasn't an option like it is today...not to mention no one was really making oils for that purpose. Now that we have that it is easier to build a gear diff and have it set the same every single time unlike a ball diff. Initially ball diffs worked more like a limited slip diff so the torque to the ground could be tuned somewhat...after slipper clutches came out that became unnecessary.
InspGadgt is offline   Reply With Quote
Old 07-05-2010, 06:49 AM   #609
Tech Master
 
FREAKAH's Avatar
R/C Tech Elite Subscriber
 
Join Date: Jan 2002
Posts: 1,389
Default

A gear diff is not without some issues....

It does wear to some degree. As it wears(gears, O-rings, diff case, etc..) you of course get a slightly looser setting.

Diff build/set-up/feel can be affected by many things too. Shims, O-rings drag/O-ring swelling, oil fill level, wear, gasket and/or sealant, screw tightness, variances in tolerance of moulded diff halves, etc..


And a gear diff does require some maintenance also, especially with the lighter diff oils that are used in EP touring. Diff oils do leak out slowly over time and that does affect the setting. I once found my MTX-3's rear diff empty after not checking it for several months. There were the usual slight oil trails coming from the outdrive shaft area and the diff halves were well sealed with the required gasket plus a light smearing of RTV silicone sealant, so it beat's me where all the oil went.


Sooo, i'm just saying a gear diff is not fool proof and/or maintenance free.
__________________
Second-Hand Racing
RACE WORLD HAWAII
Losi Type-R |Tamiya F104 PRO | Tamiya F103 | Mugen MTX-4R | AE FT GT2
FREAKAH is offline   Reply With Quote
Old 07-05-2010, 08:08 PM   #610
Tech Elite
 
seaball's Avatar
R/C Tech Charter Subscriber
 
Join Date: Sep 2001
Posts: 4,303
Trader Rating: 9 (100%+)
Send a message via Yahoo to seaball
Default

Quote:
Originally Posted by FREAKAH View Post
A gear diff is not without some issues....

Sooo, i'm just saying a gear diff is not fool proof and/or maintenance free.
for sure. but i think it's a better platform to work from. again though, time will tell. maybe if we work with these for a while, we can replace the viscous fill with some kind of adjustable friction plate setup and they'll be even more hassle free. who knows. but i know i got tired of ball diffs on carpet, and eventually just had some one-off 20-ball pulleys made for my mi3/4's. and even those weren't bulletproof (however close).
__________________
*** The Gate II - Home of Mike Wise ***
seaball is offline   Reply With Quote
Old 07-05-2010, 08:39 PM   #611
Tech Champion
 
geeunit1014's Avatar
 
Join Date: Sep 2005
Location: The dirty burnie
Posts: 5,505
Trader Rating: 12 (100%+)
Default

Leave it to seaball to want extra balls...
__________________
Mike Gee

Awesomatix USA/Pyscho Cells Racing/Tekin/Sweep Racing/RSD/180 Raceway/Johns Mobile Raceway/TQ Wire/Avid/Sanwa
geeunit1014 is offline   Reply With Quote
Old 07-05-2010, 10:27 PM   #612
Tech Master
 
FREAKAH's Avatar
R/C Tech Elite Subscriber
 
Join Date: Jan 2002
Posts: 1,389
Default

Quote:
Originally Posted by geeunit1014 View Post
Leave it to seaball to want extra balls...


Sorry seaball...........but that was hilarious!
__________________
Second-Hand Racing
RACE WORLD HAWAII
Losi Type-R |Tamiya F104 PRO | Tamiya F103 | Mugen MTX-4R | AE FT GT2
FREAKAH is offline   Reply With Quote
Old 07-05-2010, 10:30 PM   #613
Tech Master
 
FREAKAH's Avatar
R/C Tech Elite Subscriber
 
Join Date: Jan 2002
Posts: 1,389
Default

Quote:
Originally Posted by seaball View Post
for sure. but i think it's a better platform to work from. again though, time will tell. maybe if we work with these for a while, we can replace the viscous fill with some kind of adjustable friction plate setup and they'll be even more hassle free. who knows. but i know i got tired of ball diffs on carpet, and eventually just had some one-off 20-ball pulleys made for my mi3/4's. and even those weren't bulletproof (however close).
Yeah, it takes time(along with the mess) to get at a setting that you want but once you do it's all good. Just check the feel every once in a while.
__________________
Second-Hand Racing
RACE WORLD HAWAII
Losi Type-R |Tamiya F104 PRO | Tamiya F103 | Mugen MTX-4R | AE FT GT2
FREAKAH is offline   Reply With Quote
Old 07-06-2010, 08:33 AM   #614
Tech Champion
 
RC MARKET's Avatar
 
Join Date: Feb 2007
Location: HK
Posts: 6,172
Trader Rating: 12 (100%+)
Default

New Narrow Suspension Mount
Attached Thumbnails
Sakura Zero - New Touring Car!-3r-sak-60pk.jpg   Sakura Zero - New Touring Car!-3r-sak-61pk.jpg   Sakura Zero - New Touring Car!-3r-sak-62pk.jpg   Sakura Zero - New Touring Car!-3r-sak-63pk.jpg   Sakura Zero - New Touring Car!-3r-sak-64pk.jpg  

RC MARKET is offline   Reply With Quote
Old 07-08-2010, 08:59 PM   #615
Tech Elite
 
The Teacher's Avatar
 
Join Date: Aug 2001
Location: Washington, DC
Posts: 4,840
Trader Rating: 48 (100%+)
Default

seaball, you still rolling with Schumacher or did you get a 3 racing car...
The Teacher is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Adelaide Electric Radio Control Car Club Inc penmark67 Australian Racing 6824 07-10-2014 05:51 AM



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 03:28 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net