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Old 12-21-2016, 08:46 AM   -   Wikipost
R/C Tech Forums Thread Wiki: Kyosho Ultima RB6 & RB6.6 Car Thread
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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

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Old 01-06-2017, 02:25 AM   #14071
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What gear diff oil are you guys running? Weight?

Looking at getting Kyosho Silicone Differential Oil (40cc) (4,000cst) for KYOUMW604 w/ KYOUMW726. Thoughts?

Thanks
Any advice? Thanks
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Old 01-06-2017, 06:24 AM   #14072
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Are some folks dropping the stock ball diff, after it wears, in favor of the SC6 gear diff?

/I did that in all of my Associated SC10's...
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Old 01-06-2017, 10:17 AM   #14073
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Good morning,

I am looking to build my RB6 and RB6.6 for a carpet track. I went on Petite RC to look at some setups and noticed that on one particular build, the person was using Associated shock springs. Do these work interchangeably w/ Kyosho shocks or do some mods need to be made?

Thanks in advance for any advice/guidance.
I'm running that build. Spring work great!
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Old 01-06-2017, 10:17 AM   #14074
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Laydown arraignment uses the same waterfall part. Maybe somebody else knows what the nubs are.
Kyle, please see the attached picture.
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Kyosho Ultima RB6 & RB6.6 Car Thread-nubs.png  
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Old 01-07-2017, 12:11 AM   #14075
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Originally Posted by LoudOne View Post
What gear diff oil are you guys running? Weight?

Looking at getting Kyosho Silicone Differential Oil (40cc) (4,000cst) for KYOUMW604 w/ KYOUMW726. Thoughts?

Thanks
What surface will you be running on? 3000 is always a safe bet to start.
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Old 01-07-2017, 03:00 AM   #14076
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What surface will you be running on? 3000 is always a safe bet to start.
Carpet... I saw one of Jared Tebo's setups on Petit and decided on Kyosho 5000.
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Old 01-07-2017, 10:55 AM   #14077
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Originally Posted by loaba View Post
Are some folks dropping the stock ball diff, after it wears, in favor of the SC6 gear diff?

/I did that in all of my Associated SC10's...
Only if you are running on carpet or astroturf. The ball diff is much better on dirt.
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Old 01-07-2017, 06:34 PM   #14078
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For a dirt glue track without a doubt go 3 gear laydown with shocks on the front of the arm and a ball diff in 17.5. Kyosho ball diff is butter smooth out of the package with stock parts, and lasts quite a while.
The hot setup at my track is the lay down, gear diff 3k oil and shocks on the back of the arms. I am just not sure what to do. I was thinking of going midmotor, gear diff and shocks on the rear.
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Old 01-07-2017, 07:15 PM   #14079
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Originally Posted by Kylevergata View Post
Building my 6.6 right now and a fellow Kyosho driver gave me his setup for our local track. His comment area states that the nubs are removed from the waterfall. Question is where are these "nubs" thanks
If you look at the waterfall brace you will see them they stick out the front and are for the shelf to screw on to. I'm assuming he removed them to get a normal size shorty as far back as possible.
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Old 01-07-2017, 07:22 PM   #14080
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Thank you. I will go that route. I rally appreciate everyone.

How many of you have built the kit stock with no aluminum? I plan on just building it as is.
In my experience the c hubs have a weak spot in them and the insert breaks out exotek make alloy ones that are great. Also the steering rack should be alloy so you can use bearings and remove a bit of play again exotek make a good one. Also lunsford make the best ball cups only problem is they are shorter then stock and you need the titanium turnbuckles to go with them.
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Old 01-07-2017, 07:53 PM   #14081
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I have a RB6 stock shocks and 3 times in races today, I cracked my shock end in half. Could someone please tell me why this is happening. I had minimal camber and haven't had this issue in the past. Any suggestions would be deeply appreciated.
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Old 01-07-2017, 08:19 PM   #14082
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So here she is, just waiting to get my shell back from the painter. Might source a second shell and one-shot it white, put stickers on it.

Right now, I think my ball diff is way to loose. Give it gas and the thing really slips. Won't address that until the Schelle slipper shows up in the mail.

/if there's a better place for pics, lemme know
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Old 01-07-2017, 08:46 PM   #14083
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I have a RB6 stock shocks and 3 times in races today, I cracked my shock end in half. Could someone please tell me why this is happening. I had minimal camber and haven't had this issue in the past. Any suggestions would be deeply appreciated.
Stop hitting stuff
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Old 01-08-2017, 07:41 AM   #14084
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1st time racer as well yesterday and I agree with that as well, except my last race was pretty smooth with very limited carnage. Would anything else other than hitting something cause this? (Too stiff/loose shocks,wrong positions of shocks, camber)?
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Old 01-08-2017, 12:24 PM   #14085
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Originally Posted by ruttrowreroy View Post
I have a RB6 stock shocks and 3 times in races today, I cracked my shock end in half. Could someone please tell me why this is happening. I had minimal camber and haven't had this issue in the past. Any suggestions would be deeply appreciated.
Which end?

Was the air temp cold in the building?

If it was the plastic top, is there any chance that it can come in contact with the shock tower during full suspension compression?
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