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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 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

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Old 08-04-2015, 10:25 PM
  #12301  
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Originally Posted by 13Maschine View Post
THANKS ROB! Has anyone had any experience with the RC Shox Dual Stage piston setups? If so what kit did you go with? I've been running the VRP products dual stage setup in my D413 and it rocks but I like the adjustable part of the RC shox setup better at least looking at it and reading about it.
I'm going to try these in my Schumachers. I currently have the MIP pistons on my RB6 and LOVE it. The car glides over the rough stuff.
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Old 08-05-2015, 05:12 AM
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Got to run my rb6 last night needs a little more on power steering. Running basically the zach Rogers set up. Anyone else had this issue? Or any ideas I may be over looking I was on miss matched rubber beams rear ions front. I'm thinking when I go to ions on all corners I should be good
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Old 08-05-2015, 07:49 AM
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I would love to use a 3rd channel to move the battery forward and back during a race. This radiopost has the perfect thumb wheel for it. Would take some engineering to make it light yet strong enough to support a battery.
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Old 08-05-2015, 09:02 AM
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Padaow!
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Old 08-05-2015, 06:46 PM
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Originally Posted by eper View Post
Got to run my rb6 last night needs a little more on power steering. Running basically the zach Rogers set up. Anyone else had this issue? Or any ideas I may be over looking I was on miss matched rubber beams rear ions front. I'm thinking when I go to ions on all corners I should be good
Try lowering your front droop by a hair... Maybe half a turn on the eyelet.
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Old 08-06-2015, 03:41 AM
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Originally Posted by rpboggs1 View Post
Try lowering your front droop by a hair... Maybe half a turn on the eyelet.
thank you im going to run this weekend and see if it was a tire thing but i was also thinking of dropping the spindle a half mm same thing kinda isnt it?
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Old 08-06-2015, 06:48 AM
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Originally Posted by eper View Post
thank you im going to run this weekend and see if it was a tire thing but i was also thinking of dropping the spindle a half mm same thing kinda isnt it?
I'm not really sure if spindle height would act the same... It might.

When I first put on the ZR setup (exactly), it pushed like a freight train. I lowered the front droop by turning the front shock eyelets in a little bit and it immediately drove like a slot car. If you're close, I would say half a turn should do the trick.
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Old 08-06-2015, 10:45 AM
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So I'm hearing rumors of a 3 gear transmission to help the RB6 at the Yatabe Worlds and wondering how things may translate down to my medium/high bite dirt world. At Yatabe I assume the K boys will be running the 3 gear and gear diffs. I know Jason Diaz ran home brewed 3 gear at Cactus on the high bite there. I'm pretty happy with my 4 gear tranny at OCRC. Anybody have any insight on how high bitey things need to be to justify going 3 gear? Maybe low-medium bite 4 gear with ball diff, high-ish bite 3 gear with ball diff, and very high bite 3 gear with gear diff?

For a little competition perspective, the new Yokomo YZ-2 sticks with 4 year but the B5M guys seem to be jumping on the 3 gear.
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Old 08-06-2015, 05:35 PM
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I've been trying 3 gear the last few weeks. Im not 100% confident mine is built correctly in regards to binding, but my thoughts are this:

A lot more low end power
Rear end stays flatter
Rear end stays flatter so you have to put more grip in the rear
Breaking is AWESOME
Jumping takes a bit to get used to but its pretty good (you stay in throttle a little quicker)
Lighter, so it changes the weight distribution

For stock racing, I believe to be almost essential. For mod, if you have the grip then I think it is a good option for you. At a track like mine, grip is up and down and when its up 3 gear is great. When it goes down you wish you had some more rear bite.

It will be a nice option when it comes out.
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Old 08-06-2015, 06:19 PM
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Wouldn't a 3 gear increase the ability to rotate the car in the air or am I thinking backwards..
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Old 08-06-2015, 10:10 PM
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Thanks for the thoughts K_King. Something to keep an eye on and think about.
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Old 08-07-2015, 04:45 AM
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With regard to the 3 gear I think K_King has covered most of the points but I'll add;

When you have side bite the corner speed is much higher than with a 4 gear so you don't have to jump on the gas as hard as you would hence you don't notice the loss of forward drive that is there with a 3 gear from low speeds.

When really slippery (I'm talking wet astroturf which makes most loamy dirt surfaces look positively high bite) I've found that the 3 gear can be BETTER than a 4 gear as you don't struggle for front end thus carry more corner speed so don't need to be as aggressive with the throttle!

When chasing grip with the 3 gear I've found stiffening the rear anti-sway bar and softening the spring helps a lot as it helps the car squat without becoming too soft in roll.
The brass RF block also helps the 3 gear setup a lot more than the 4 gear.

The 3 gear car is also FAR less sensitive to front droop adjustments in terms of on-power steering but far more responsive to it in terms of rearward weight transfer to generate forward drive so there is another tool to help generate traction.
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Old 08-09-2015, 06:28 AM
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Does the rb6 2015 allow u to run the battery sideways without milling the chassis?
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Old 08-09-2015, 03:18 PM
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Originally Posted by yodace View Post
Does the rb6 2015 allow u to run the battery sideways without milling the chassis?
You can run it sideways but you have to cut the plastic side rails. The battery will sit up off the center of the chassis if you don't grind it.
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Old 08-09-2015, 08:08 PM
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Default Ball Diff Build

Whats Up All!!!
New RB6 owner.
Working my build right now and I've built a bunch of kits but I'm having a hell of a time with the ball diff. Built to the instructions every step of the way down to having the washers in the correct direction but the diff wont diff. I turn it all the way in it gets to lock, I back it out a but and I turn one outdrive the other doesn't move (no diff action). I've carried out the whole process a couple times now and no luck so I thought I'd try you kind folks!
Any input is much appreciated!!!

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