R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 07-20-2008, 09:21 AM   #1
Tech Regular
 
Join Date: Jun 2008
Location: The OC
Posts: 291
Wink 4WD Setup...Diff Front, One way Rear?

4WD Setup...Diff Front, Oneway Rear? Such as in a B44 or other 1/10 scale 4WD car.

How do you think this would do if set up optimally?

Have you heard of anybody trying it?
haulin79 is offline   Reply With Quote
Old 07-20-2008, 09:51 AM   #2
Tech Adept
 
Join Date: Sep 2007
Posts: 212
Trader Rating: 6 (100%+)
Default

wow, never heard of a one way in the rear before. I wonder if that would work in a TC with a spool up front. Maybe I'll have to try it.
deskwarmer is offline   Reply With Quote
Old 07-20-2008, 10:18 AM   #3
Tech Lord
 
20 SMOKE's Avatar
 
Join Date: Dec 2003
Location: HVR_ WEEKI WACHEE FL
Posts: 10,299
Trader Rating: 101 (100%+)
Default

only way to find out is to try
__________________
Jamie W
*Team Tekin*Tekno-rc*DE Racing*AKA*DDHRC*
20 SMOKE is offline   Reply With Quote
Old 07-20-2008, 11:03 AM   #4
Tech Regular
 
Join Date: Jun 2008
Location: The OC
Posts: 291
Default

Here is the theory.

1. During Acceleration (Weight is shifted to the rear): +Peglegging is eliminated because of the oneway in the rear.

2. During Braking (Weight is shifted to the front): +The front differential can transmit the necessary braking power. As an example, a FWD front diff car should be able to brake faster than RWD rear diff car.

3. Left Turn During Acceleration (Weight is shifted to the right rear): +Oneway in rear allows for power to be transmitted to the right rear wheel without peglegging -Oneway forces the left rear wheel to spin at the same speed as the right rear thus increasing the tendency for understeer.

4. Left Turn During Braking (Weight is shifted to the right front): +Diff in the front will enable differentiation and braking at the same time. This will allow for powerful braking and being able to tune for neutral steering.
haulin79 is offline   Reply With Quote
Old 07-20-2008, 11:09 AM   #5
Tech Lord
 
wingracer's Avatar
 
Join Date: Nov 2007
Posts: 12,861
Trader Rating: 24 (100%+)
Default

The problem is that with all that front brake with no rear braking the car will not turn while braking. If you don't drive that way it might work.
__________________
Sean. Certified speed crazed mowron.
Team Shepherd USA
www.ashfordhobby.com
wingracer is offline   Reply With Quote
Old 07-20-2008, 11:22 AM   #6
Tech Regular
 
Join Date: Jun 2008
Location: The OC
Posts: 291
Default

I guess from a theoretics point of view we could have long discussions...I just need to buy a B44 and try it out! haha

Does anybody have any real experience with this kind of set up?
haulin79 is offline   Reply With Quote
Old 07-20-2008, 01:11 PM   #7
Tech Addict
 
gsrman4885's Avatar
 
Join Date: Jan 2008
Location: Out plotting to take over the world!!!!!
Posts: 690
Trader Rating: 23 (100%+)
Default b44

You might have a hard time trying that in a b44 since it is shaft drive and you would have to flip the diff over so the wheels would be going in the right direction. I believe that you would have no rear wheel drive and 4-wheel braking. In a belt drive car it shouldn't be much of a problem though.
gsrman4885 is offline   Reply With Quote
Old 07-20-2008, 01:34 PM   #8
Tech Master
 
downtempo's Avatar
 
Join Date: Jul 2008
Location: Costa Mesa
Posts: 1,857
Trader Rating: 4 (100%+)
Send a message via AIM to downtempo
Default

Didn't BMag try this? Not trying to be a smart*ss, I think I read somewhere (Oople?) he tried this.
downtempo is offline   Reply With Quote
Old 07-20-2008, 01:45 PM   #9
Tech Elite
 
UK.hardcore's Avatar
 
Join Date: Aug 2007
Location: Belgium.
Posts: 2,137
Default

If you drop a front one-way in a B44 rear you have made a FWD with all wheel brake's.

Other way is switching the one-way bearing in the housing,
then you have a one-way in the rear like it works in the front.

Without any rear wheel braking i think a RC car cant be drivin like it should at all.

But i would want too see a video if you go and do this.
__________________
A racecar is only as good as the mechanic who build it.
UK.hardcore is offline   Reply With Quote
Old 07-20-2008, 05:54 PM   #10
Tech Addict
 
KostaG's Avatar
 
Join Date: Jun 2008
Location: Texas
Posts: 524
Trader Rating: 48 (100%+)
Default

You guys ever try running a solid front?

The benefits of an oneway + braking as well, been thinking of trying it to see how the handling would get affected.
__________________
Current Cars:
- Schumacher SX3 & Cougar SV
- Mugen MRX5 WC, Serpent 966e (4s)& Motonica P81e (6s)
Collector/Vintage Cars:
-Serpent F180 (2x), Serpent Veteq, Losi Jrx2, Tamiya Avante & Associated RC10
KostaG is offline   Reply With Quote
Old 07-20-2008, 07:27 PM   #11
Tech Regular
 
Join Date: Jun 2008
Location: The OC
Posts: 291
Default

The problem with spools is that they do not allow differentiation for the turns. Both one ways and differentials allow for left right speed differentiation.
haulin79 is offline   Reply With Quote
Old 07-21-2008, 12:23 AM   #12
Tech Addict
 
Join Date: May 2008
Posts: 576
Trader Rating: 9 (100%+)
Default

Quote:
Originally Posted by haulin79 View Post
The problem with spools is that they do not allow differentiation for the turns. Both one ways and differentials allow for left right speed differentiation.
I dont see how a one-way can allow left and right wheel speed differences unless you are under braking and turning into a corner where the inside wheel will slow down because of the one-way bearing but on acceleration both wheels should be locked like a spool right?

Now the downfall i see with a one-way in the rear and this is my theory on it is when you brake for a corner the front wheels are slowing down via the driveshaft or belt but the rear wheels are not thus the car is going to get rear end loose easily coming into a corner and if you are braking while turning i will bet that the car will want to spin out very easily.
__________________
Tater salad the stories behind nick names how it stuck at that track is beyond me, good times, short lived, forever missed FHR.
Tater salad is offline   Reply With Quote
Old 07-21-2008, 05:28 AM   #13
Tech Elite
 
ta_man's Avatar
 
Join Date: Nov 2006
Location: New Jersey
Posts: 4,365
Trader Rating: 151 (100%+)
Default

Quote:
Originally Posted by Tater salad View Post
I dont see how a one-way can allow left and right wheel speed differences unless you are under braking and turning into a corner where the inside wheel will slow down because of the one-way bearing but on acceleration both wheels should be locked like a spool right?
The slower turning wheel (shorter radius - inside wheel) gets driven and the faster one free-wheels.
ta_man is offline   Reply With Quote
Old 07-21-2008, 02:02 PM   #14
Tech Addict
 
Join Date: May 2008
Posts: 576
Trader Rating: 9 (100%+)
Default

thats what i meant.
__________________
Tater salad the stories behind nick names how it stuck at that track is beyond me, good times, short lived, forever missed FHR.
Tater salad is offline   Reply With Quote
Old 07-21-2008, 07:11 PM   #15
Tech Fanatic
 
sport10's Avatar
 
Join Date: Dec 2005
Location: Pensacola, FL
Posts: 969
Default

I believe that a spool in the front will take away some steering verses a oneway. Don't they use them quite a bit in onroad.
__________________
Hot Bodies VE8 w/ RX8-1900 combo
Associated B44
Associated B6
Associated TC7.1
Durango DESC410V2 Pro
sport10 is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Fioroni Front/Rear Diff for Ofna/Gs Imdadundada7 R/C Items: For Sale/Trade 30 03-14-2007 07:39 PM
HPI Pro 4 Front One Way and rear diff. Blacktiger355 R/C Items: Wanted to Buy 4 03-06-2007 08:09 AM
Front & Rear Diff fluid changes, how it affects steering? Cain Monster Trucks 11 08-01-2006 02:34 PM
front/rear kyosho diff needed quickly maxxman101 R/C Items: Wanted to Buy 0 06-02-2005 11:02 PM
MTX3 FRONT and/or REAR Diff. rcfoolz R/C Items: Wanted to Buy 1 06-30-2004 12:13 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 04:18 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