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Kyosho Ultima RB6 & RB6.6 Car Thread

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Kyosho Ultima RB6 & RB6.6 Car Thread

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Old 12-21-2016, 08:46 AM   -   Wikipost
R/C Tech ForumsThread 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(0į/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

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Old 07-25-2018, 03:18 AM
  #14791  
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Originally Posted by ceh329 View Post
Hi all, hey Iím going to setup my RB6.6 using the 4 gear mid. Iíve been running on a loose dirt track and many of the faster drivers for AE and Losi are running mid not lay down. I want to give it a try. So my question is how do I mount my motor fan? In lay down there is room on the chassis but not when running mid stand up.

thanks!
What motor are you running? What are your temps like without it? Do you really need a fan? If you are running on low grip loose conditions you donít need a lot of motor. I mentioned earlier that shapeways has a fan motor mount.
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Old 07-25-2018, 06:55 AM
  #14792  
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Originally Posted by nitro-rob View Post

What motor are you running? What are your temps like without it? Do you really need a fan? If you are running on low grip loose conditions you donít need a lot of motor. I mentioned earlier that shapeways has a fan motor mount.
The track I'll be running is having us run the Hobbywing Justock and locked timing 17.5 motor as a spec class. Do you think I would need a fan on the motor with that combination? It's a medium sized low grip dirt track. I know in on road they are almost running a fan on the motor when running a 2s battery, but didn't know if it would be different in 2wd buggy.
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Old 07-25-2018, 12:06 PM
  #14793  
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Originally Posted by lowdoughracer View Post
The track I'll be running is having us run the Hobbywing Justock and locked timing 17.5 motor as a spec class. Do you think I would need a fan on the motor with that combination? It's a medium sized low grip dirt track. I know in on road they are almost running a fan on the motor when running a 2s battery, but didn't know if it would be different in 2wd buggy.
Onroad 17.5 motors are pushed like crazy and have a lot of timing which generates heat. I doubt you need one with that motor with fixed timing. Just gear it accordingly but my guess is it will feel right and not be hot and if you pushed the gearing too far the motor performance wouldnít be good. Try it and check temps.
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Old 07-25-2018, 05:03 PM
  #14794  
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Are you running fans on the speed controls automatically? Or does that follow the same lines as the motor? Is there much of a difference in how people mount the electronics in the chassis? Would you mount them different based on running on a low grip direct track versus something that is a lot higher?
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Old 07-25-2018, 09:52 PM
  #14795  
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I run stock 17.5T both 2wd and 4wd buggies, and also 21.5T touring car and F1, and don't need fans on the ESC, just on the motor in the 4wds. From what I can gather the motors are stressed in stock and thats where you have the heat problems, but in mod the ESC that gets hot and the motors have it relatively easy. With the slower motors you are so far under the limits of what the ESC can handle that there aren't any problems.

Most ESC should have thermal cutoff so you won't damage them, they should just shutdown.

As always, its best to run it and check the temps to be sure. All sorts of things come into play like ambient temperature on the day etc
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Old 07-26-2018, 12:14 AM
  #14796  
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Originally Posted by lowdoughracer View Post
Are you running fans on the speed controls automatically? Or does that follow the same lines as the motor? Is there much of a difference in how people mount the electronics in the chassis? Would you mount them different based on running on a low grip direct track versus something that is a lot higher?
Same for the esc. I remove fans for 2wd and would run a fan on a 4wd depending on the esc and motor. Look at the tekin rs esc with a 8.5 turn 2wd limit and it doesnít even have a heat sink let alone a fan.

It sounds like you are nowhere near needing any fans. Good. Less to worry about
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Old 07-27-2018, 08:48 PM
  #14797  
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It really depends on your electronics. The juststock tends to get warm is 17.5 2wd. I would probably run a fan on it. For a fixed timing motor, you wonít be able to use timing, (which is what creates most of the heat) so probably no fan there. For a timed motor, you will want a fan so that you can push your motor and go faster!
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Old 07-30-2018, 10:28 AM
  #14798  
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Are there any good resources to read about what adjustments are most effective on the chassis as well as finding suggested setups for loose dirt track conditions?
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Old 07-30-2018, 10:43 AM
  #14799  
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Originally Posted by lowdoughracer View Post
Are there any good resources to read about what adjustments are most effective on the chassis as well as finding suggested setups for loose dirt track conditions?
Hello,

Yes, this is a great resource and provides information based on track and surface type.
Kyosho Ultima RB6 & RB6.6 Setup Sheets

Let us know if you found it helpful and which adjustments you found most effective.
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Old 08-01-2018, 04:40 PM
  #14800  
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Hello,

What has been your experience using sway bars on the RB6.6 car?
Are they better suited for certain tracks, like dirt or carpet?
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Old 08-21-2018, 07:02 AM
  #14801  
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Received my RB6.6 the other day. It's sitting on the bench waiting for parts and electronics before I build. This is my first race worthy RC unless I count my TA-07. After the build I might look for a local club to start actually racing with. I've only "competed" one Mini-Z race before.. other than that I've been a basher for the last ten or so years

Thank you all for the informative thread... Yes I read the whole thing.. I kind of like to know what I'm getting into before I buy.
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Old 08-22-2018, 04:46 PM
  #14802  
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Hello,

Can you folks help me decipher the RB6.6 set up sheet?
Kyosho RB6.6 - Shaun Thompson - Mansfield - 14.09.2016

The car is awesome, but the instructions are a little spare on guidance and steps for set ups and how changes affect handling.
The set up sheet has some clear items, but in general is not intuitive at all. Your help is much appreciated.
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Old 08-22-2018, 04:52 PM
  #14803  
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Here is another visual
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Old 08-22-2018, 05:22 PM
  #14804  
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What is it about the setup sheet you have questions about?
Even though it doesn't say, I can tell this is a carpet setup with a hot motor for an experienced driver.
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Old 08-22-2018, 06:11 PM
  #14805  
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Originally Posted by oPAULo View Post
What is it about the setup sheet you have questions about?
Even though it doesn't say, I can tell this is a carpet setup with a hot motor for an experienced driver.

Please pardon my being a noob in this instance, but reading this thread is my first ever hearing about set-up sheets, using off-road buggies on carpet, mid motor buggoes and 17.5 setups being considered fast... Lol. Ive never raced before, and I want to try it out.

Can you tell me how you can read this and know it's a carpet setup? My only guess is the high traction part would be a giveaway.
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