R/C Tech Forums

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

    Hide Wikipost
Old 12-21-2016, 08:46 AM   -   Wikipost
R/C Tech Forums Thread Wiki: Kyosho Ultima RB6 & RB6.6 Car Thread
Please read: This is a community-maintained wiki post containing the most important information from this thread. You may edit the Wiki once you have been a member for 90 days and have made 90 posts.
 
Last edit by: tobamiester
RB6.6 Kyosho America Product Page: http://www.kyoshoamerica.com/ULTIMA-...T_p_24505.html

RB6.6 Manual http://www.kyosho.com/jpn/support/in...A_RB6_6_IM.pdf

RB6.6 Kyosho Youtube https://www.youtube.com/watch?v=vW_sR667utY

MSRP $639 MAP $399.99

-------------------------------
New RB6.6 parts (compared exploded views, prices and links are Kyosho America):

Chassis:
  1. Main chassis - UM731 - $125.99
  2. Side guards - UM732 - $9.99

Battery Holder:
  1. Battery plate - UM733 - $8.99
  2. Battery foam - UM741 - $7.99

Rear Bulkheads:
  1. MM3 and Laydown - UM740 - $9.99
    • MM3 bulkhead
    • Laydown bulkhead
    • Swaybar Holders

3 Gear Transmission (MM and RM):
  1. Transmission - UM734 - $10.99
    • transmission cases
    • spacers
    • caps
    • plastic FR & RR suspension hangers

  2. Gear Cover - UM735 - $6.99

Laydown Transmission (3 and 4 gear possible):
  1. Transmission - UM736 - $10.99
    • transmission cases
    • spacers
    • caps
    • required extra hardware
    • pastic FR suspension hanger

  2. 40T idler - UM737 - $6.99
  3. Motor plate - UM738 - $18.99
  4. Gear cover - UM739 - $6.99

Body:
  1. Blade body - UMB05 - $27.99

Optional Parts:
  1. Lightweigt Blade body - UMB05LW - $31.99
  2. Aluminum FR suspension hanger - UMW705B - $28.99 (may be able to file UMW705 to fit)
  3. Brass FR suspension hanger - UMW725B - $30.99 (looks more different than UMW725..someone confirm?)

Typical Upgrades for new RB6.6 Buyers

UMW701 Aluminum Steering Plate (RB6)
UMW702 Aluminum Crank Arm (RB6)
UMW704-0 V2 Aluminum Rear Hub Set(0/RB6)
UMW705B Aluminum Rear Sus. Holder (RF/RB6.6) or brass UMW725B
UMW707 Aluminum Rear Sus. Holder (RR-Mid)

Nice to have:

UMW723 Aluminum Front Sus Block (Type B/10g/RB6/RT6/SC6).


Aftermarket Parts:

Front Wing: https://www.prolineracing.com/perfor...mount-alum-rb6

Print Wikipost

Like Tree6Likes
Reply
 
Thread Tools Search this Thread
Old 02-07-2013, 08:12 AM   #5026
Super Moderator
 
Cpt.America's Avatar
R/C Tech Elite Subscriber
 
Join Date: Mar 2009
Location: Washington State
Posts: 11,083
Trader Rating: 52 (100%+)
Default

Quote:
Originally Posted by X God View Post
I read on the first page that Capt.America ran the narrow rear hangers to lock the rear end in more. Has anyone else tried it and what were your thoughts compared to the wides, Thanks.
Quote:
Originally Posted by SAMCRO View Post
I run wides and my car is locked down.
There are a LOT of things you an do (or not do) that can make one end of the car either locked in, or loose. But with everything else being 100% equal, a wider track will yield less grip on that end of the car. (were not talking vast amounts here, just a slight difference)
__________________
A big thanks to my sponsors:
- Fantom Racing - www.fantomracing.com -
- Fusion Graphix- www.fusiongraphix.com -
- RCSpecialties -
Cpt.America is offline   Reply With Quote
Old 02-07-2013, 08:30 AM   #5027
Tech Elite
 
seth556's Avatar
 
Join Date: May 2005
Location: Orlando, FL
Posts: 2,201
Trader Rating: 42 (100%+)
Default

I always felt like when it'd go back and forth on my SC-R between the wide and normal blocks that the wide blocks were super stable but quit rotating while the normal blocks made it rotate much better. Although that was with stock and a very slow truck.
seth556 is offline   Reply With Quote
Old 02-07-2013, 08:38 AM   #5028
Tech Initiate
 
Join Date: Feb 2013
Posts: 36
Trader Rating: 3 (100%+)
Default

www(dot)kyosho(dot)com/jpn/products/rc/parts_images/UMW702.jpg

www(dot)kyosho(dot)com/jpn/products/rc/parts_images/UMW703.jpg

These were on the kyosho website yesterday
QIMB528 is offline   Reply With Quote
Old 02-07-2013, 08:52 AM   #5029
Tech Regular
 
Join Date: Mar 2003
Location: Newbury Park, CA
Posts: 334
Trader Rating: 29 (100%+)
Default

Quote:
Originally Posted by QIMB528 View Post
www(dot)kyosho(dot)com/jpn/products/rc/parts_images/UMW702.jpg

www(dot)kyosho(dot)com/jpn/products/rc/parts_images/UMW703.jpg

These were on the kyosho website yesterday


Yzlvr is offline   Reply With Quote
Old 02-07-2013, 08:59 AM   #5030
Tech Elite
 
Rfury's Avatar
 
Join Date: Apr 2007
Location: NW Ga
Posts: 4,503
Trader Rating: 6 (100%+)
Send a message via AIM to Rfury Send a message via Yahoo to Rfury
Default

You missed this as well.

UMW701

__________________
Kyosho RB6
Kyosho ZX6
Kyosho MP9e TKI
Rfury is offline   Reply With Quote
Old 02-07-2013, 09:12 AM   #5031
Tech Elite
 
K_King's Avatar
 
Join Date: Jul 2006
Location: San Diego, CA
Posts: 4,172
Trader Rating: 38 (100%+)
Send a message via AIM to K_King
Default

But I already have my red ones
__________________
TLR - Spektrum - Pro-Line - Team Orion - Stickit1 - Schelle
K_King is offline   Reply With Quote
Old 02-07-2013, 09:18 AM   #5032
Tech Elite
 
Join Date: Sep 2007
Location: All 48 states...
Posts: 2,053
Trader Rating: 1 (100%+)
Default

Has anyone found the sweet spot for gearing a vst 17.5 in the Rb6?
Gitsum is offline   Reply With Quote
Old 02-07-2013, 10:28 AM   #5033
Tech Elite
 
Rfury's Avatar
 
Join Date: Apr 2007
Location: NW Ga
Posts: 4,503
Trader Rating: 6 (100%+)
Send a message via AIM to Rfury Send a message via Yahoo to Rfury
Default

Quote:
Originally Posted by ridein04 View Post
Or you could go straight to Absolute website and buy it for $449, use their feb coupon and get it for $424
Where could I find this coupon of which you speak?
__________________
Kyosho RB6
Kyosho ZX6
Kyosho MP9e TKI
Rfury is offline   Reply With Quote
Old 02-07-2013, 11:06 AM   #5034
Super Moderator
 
Cpt.America's Avatar
R/C Tech Elite Subscriber
 
Join Date: Mar 2009
Location: Washington State
Posts: 11,083
Trader Rating: 52 (100%+)
Default

Quote:
Originally Posted by seth556 View Post
I always felt like when it'd go back and forth on my SC-R between the wide and normal blocks that the wide blocks were super stable but quit rotating while the normal blocks made it rotate much better. Although that was with stock and a very slow truck.
Going to a wider rear track increases rotation in 3 ways, if all you change are your hangers and nothing else:

1. A wider track technically raises your roll center (which increases roll resistance)as your contact patch is now farther away from the center of the car. Roll center by ELVO

2. Your lower shock mount is technically farther away from the car as well, and if your shock length hasn't changed, you have removed droop. (which reduces roll)

3. It's possible the wider lower shock mount position also makes the rear suspension stiffer... unless that's determined by the distance from the pivot rather than the middle of the car.... im not sure if it is.

Any way you cut it, all of theses will reduce traction in the rear, and increase steering. There is ONE scenario where raising your roll center and increasing roll resistance will increase traction instead of decreasing, and that is if you generate SO much traction and roll, that you actually go over the edge of your traction curve, and go into a skid (what happens with 1:1 cars). In that case, stiffer/wider/more roll resistance can actually aid in traction, because you are no longer skidding out. You need to understand how the traction curve of a rubber tire works to get your head around it.
__________________
A big thanks to my sponsors:
- Fantom Racing - www.fantomracing.com -
- Fusion Graphix- www.fusiongraphix.com -
- RCSpecialties -

Last edited by Cpt.America; 02-07-2013 at 11:36 AM.
Cpt.America is offline   Reply With Quote
Old 02-07-2013, 11:47 AM   #5035
Tech Master
 
cnelson3's Avatar
 
Join Date: Nov 2010
Location: Milwaukee, WI
Posts: 1,197
Trader Rating: 65 (100%+)
Default

Not to be a smart ass but my car rotated better with the narrow blocks and less with the wider ones. Exact opposite of what u just explained. My suspension feels softer with the wider blocks. As far as roll resistance is considered, u got me there. Maybe my car is the odd ball but I had different results
cnelson3 is offline   Reply With Quote
Old 02-07-2013, 11:50 AM   #5036
Super Moderator
 
Cpt.America's Avatar
R/C Tech Elite Subscriber
 
Join Date: Mar 2009
Location: Washington State
Posts: 11,083
Trader Rating: 52 (100%+)
Default

Quote:
Originally Posted by cnelson3 View Post
Not to be a smart ass but my car rotated better with the narrow blocks and less with the wider ones. Exact opposite of what u just explained. My suspension feels softer with the wider blocks. As far as roll resistance is considered, u got me there. Maybe my car is the odd ball but I had different results
Then something else changed at the same time, with a bigger effect.

Sometimes other things are felt MUCH more. For example, lets say you ran the wide blocks in the morning when traction was high... Then lets say you took a couple hours away and changed your blocks to the narrows. In the mean time, traction on the track dropped for whatever reason... You put the car down with the new narrow hangers and your rear-end is now looser due to less traction, and you say to yourself "hey... more rotation with these narrow hangers"... it wasn't the hangers, it was the track.

Obviously this is just an example of what can happen, not necessarily what did. Could of been all kinds of things.
__________________
A big thanks to my sponsors:
- Fantom Racing - www.fantomracing.com -
- Fusion Graphix- www.fusiongraphix.com -
- RCSpecialties -
Cpt.America is offline   Reply With Quote
Old 02-07-2013, 12:08 PM   #5037
Tech Champion
 
MikeXray's Avatar
 
Join Date: Oct 2006
Location: New York
Posts: 5,749
Trader Rating: 73 (100%+)
Default

Quote:
Originally Posted by cnelson3 View Post
Not to be a smart ass but my car rotated better with the narrow blocks and less with the wider ones. Exact opposite of what u just explained. My suspension feels softer with the wider blocks. As far as roll resistance is considered, u got me there. Maybe my car is the odd ball but I had different results
I am not surprised, the issue is there is more than one "part" to a turn, and the change may be more evident in one part than another. Narrowing the rear should increase rear site bite which one would think would add push, but the narrow pivot also adds rotation, but usually this is mid to exit, so you may notice a bit less turn-in but more mid to exit, thus a feeling of more overall steering.

Things also depend on the balance of you car, if the rear was already locked in, how a change feels will vary vs a car that was very free.
__________________
Mike L. Awesomatixusa.com | TQWire.com | Islandraceway.com |JacksonRCracing.com | Horsham RC | Sweepracingusa.com
MikeXray is offline   Reply With Quote
Old 02-07-2013, 12:28 PM   #5038
Super Moderator
 
Cpt.America's Avatar
R/C Tech Elite Subscriber
 
Join Date: Mar 2009
Location: Washington State
Posts: 11,083
Trader Rating: 52 (100%+)
Default

Don't think of it as "more or less traction", think of it as "more or less traction gain" This is because you develop more and more traction, the more the car rolls.

Picture car #1, a car that has it's suspension locked down so the arms can't move. If the car can't roll, the amount of traction the car has on either end of the car, will be the same at corner entrance, mid, and exit, because the car stays completely flat. You will have zero traction gain, throughout a corner.

Now, lets say you have car #2, a car with proper suspension, with a super low roll center. This car will roll a lot. The peak of it's roll will be dead smack mid corner. So picture the "curve" of your traction change. This car's curve will be tall and steep as it approaches mid corner, and then come back down again as it exits. The first car's curve would be about flat.

If you overlayed the two graphs on top of eachother, at the very entrance to the corner, the relative difference between the two is very close... and same with the very exit. The BIG difference between the two, will be in the middle.

So if you run a wider track, and therefor less roll (less traction gain)... you might say to yourself (or feel), "man this car has more rear traction at corner exit"... well, it doesn't have more traction at corner exit, it just has LESS traction mid corner than a car with a bigger curve, so you might perceive more exit traction because of how much traction it has mid corner.

Did that make any sense? I have a hard time understand what I wrote myself... I need to draw up some graphs.

What will really get you is when you start changing angles and lengths of your tie rodes, you change the shape of these traction curve graphs.
__________________
A big thanks to my sponsors:
- Fantom Racing - www.fantomracing.com -
- Fusion Graphix- www.fusiongraphix.com -
- RCSpecialties -
Cpt.America is offline   Reply With Quote
Old 02-07-2013, 12:35 PM   #5039
Tech Elite
 
t0p_sh0tta's Avatar
R/C Tech Elite Subscriber
 
Join Date: Aug 2009
Location: Connecticut
Posts: 4,863
Trader Rating: 35 (100%+)
Default

Very well said.
__________________
I've met some of the strangest people while playing with my toy cars...
t0p_sh0tta is offline   Reply With Quote
Old 02-07-2013, 12:35 PM   #5040
Tech Elite
 
Rfury's Avatar
 
Join Date: Apr 2007
Location: NW Ga
Posts: 4,503
Trader Rating: 6 (100%+)
Send a message via AIM to Rfury Send a message via Yahoo to Rfury
Default

Physics is fun.
__________________
Kyosho RB6
Kyosho ZX6
Kyosho MP9e TKI
Rfury is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Ryde it like you stole it: the Ryde Drivers thread. old_skoolie Australian Racing 22936 08-14-2017 04:25 AM
Island Raceway & Hobby (IRH), Lindenhurst, NY - Indoor Off-Road Track in Long Island Asharus Northeast Racing Forum 15013 06-22-2017 04:17 PM
Kyosho Ultima RB5 Thread Drift_Buggy Electric Off-Road 14641 11-10-2015 08:28 AM
Kyosho Ultima SC aeRayls Electric Off-Road 2599 04-27-2014 04:30 PM



Currently Active Users Viewing This Thread: 2 (0 members and 2 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 04:09 AM.


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