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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 10-17-2012, 03:56 PM   #1711
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I sold all of my tlr springs do I wouldn't be tempted to use them. My Kyosho golds will be here next week but I want to try the stock springs first.
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Old 10-17-2012, 03:59 PM   #1712
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Originally Posted by Cpt.America View Post
Softening up the springs in the rear will not help a push.. it will make it worse. If you are getting a push with the RB6, you either have a glaring setup issue, or are having a tire/insert issue.
Idk man, i ran stiff springs in my B4 rear for a long time before trying something softer and gaining lots of steering. The rear was too stiff and not letting the weight transfer side to side, especially at high speed
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Old 10-17-2012, 04:11 PM   #1713
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Idk man, i ran stiff springs in my B4 rear for a long time before trying something softer and gaining lots of steering. The rear was too stiff and not letting the weight transfer side to side, especially at high speed
Maybe try standing up the shocks so they react faster? probably have to do the same on fronts or go softer there as well and reduce pack overall? That just until you get the golds .
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Old 10-17-2012, 04:26 PM   #1714
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Originally Posted by Cpt.America View Post
Softening up the springs in the rear will not help a push.. it will make it worse. If you are getting a push with the RB6, you either have a glaring setup issue, or are having a tire/insert issue.
Tire/Insert couldnt be the issue in my case Im running 34/70 on gearing, i found this to be the cause, But car felt quicker and lap times were faster. But it wasnt steering as tight off power. I threw the Kyosho Stock back on and tried it outside on concrete, Felt the same and noticed it was still slightly the same. Went back in, Swapped for TLR yellow and it did help out a bit,
But that was on concrete, So I'll have to wait until Sunday to drive the car.
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Old 10-17-2012, 04:47 PM   #1715
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Bran,

Did you get new front tires...Those front suburbs are not that good at west coast, they over grip and cause a push.
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Old 10-17-2012, 05:02 PM   #1716
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Bran,

Did you get new front tires...Those front suburbs are not that good at west coast, they over grip and cause a push.
Yea, I swapped out for Gold Barcodes,
They helped out a bit, but still felt the same
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Old 10-17-2012, 06:17 PM   #1717
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Bran,

Did you get new front tires...Those front suburbs are not that good at west coast, they over grip and cause a push.
Not being a smart azz...but how does too much grip cause a push?
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Old 10-17-2012, 06:51 PM   #1718
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Not being a smart azz...but how does too much grip cause a push?
i'd like to know this too.
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Old 10-17-2012, 07:20 PM   #1719
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Guys mine came in today ,,new to the Kyosho world,what's some good spares or any must dos I need to know,without going through all these pages. Lol
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Old 10-17-2012, 07:34 PM   #1720
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Originally Posted by frito View Post
Guys mine came in today ,,new to the Kyosho world,what's some good spares or any must dos I need to know,without going through all these pages. Lol
typical front end parts(arms, tower(out of stock), caster, and steering blocks) and I'm guessing buy an aluminum steering rack as they have been breaking, but other than that there isn't anything.

I'd start with the base japanese setup. Should be pretty good from there as long as you choose the right tire . All the kyosho steering racks are out of stock except someone is making aluminum and another company is coming out with theirs on the 19th. If you need rear grip add some .5* rear hubs or 0* if you like the strength of aluminum.

I used a B4 CF strap to make a CF strap for mine and bought the thumb screws, cut the head off a M4 screw, cut the battery post, and threaded an M4 screw into it so I had a screw down battery hold down.

Bfast diff or ceramic thrust and carbide diff balls. Kit ones are also good.

You'll find the directions are strange and there is a lot of slop in the shock top eyelets. Kyosho says to tighten down the 4.8mm ball until it squishes and takes the slop out(which I find goofy). Be carful to not over tighen the plastic nuts that are called for or get some flanged M3 nuts. Use care in the direction of the arrow of the steering rack when putting it on unless you want to take it apart later.

Use the black SP gear in the transmission it will last longer although you will find 2 white ones in the box.

The shock ends are in different places/bags that are called for in the directions it takes some looking.

Don't spend 10 minutes looking for slipper washers that are metal... they are on one of the trees. The manual is goofy. Look at the pictures and if you don't understand ask here I'm sure someone has run into it... I understand japanese and I still didn't get it sometimes!
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Old 10-17-2012, 07:47 PM   #1721
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At West Coast...the new proline suburb front tires have way to much front grip and it causes the front to dig in too much and then you loose corner speed. When it digs in it also induces a push , because the front end has more grip than the rear. It will plow through the sweeper and that is why I recommended a different front tire for Bran.
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Old 10-17-2012, 07:55 PM   #1722
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You'll find better prices and parts availability if you look at places like speedtech and LPH
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Old 10-17-2012, 08:44 PM   #1723
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Originally Posted by lbckevin View Post
At West Coast...the new proline suburb front tires have way to much front grip and it causes the front to dig in too much and then you loose corner speed. When it digs in it also induces a push , because the front end has more grip than the rear. It will plow through the sweeper and that is why I recommended a different front tire for Bran.
Hey Kevin,

You lost me on the second part.....havent been to wc in over a year....

Soon tho, need to get reedy.
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Old 10-17-2012, 09:55 PM   #1724
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Originally Posted by t8rtot View Post
You'll find better prices and parts availability if you look at places like speedtech and LPH
I've been loving my RB6 and the disccusions on this thread, but did you know that their are other countries in the world besides the USA, I know shock horror, but for the best prices and parts availability, try RC Champ in Japan (Also where the Kyosho RB6 was made), just email them what you need and they will quote you.
I received my RB6 more than two weeks before anyone in the US and paid $445US including freight to Australia.
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Old 10-17-2012, 10:11 PM   #1725
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Originally Posted by Cpt.America View Post
Softening up the springs in the rear will not help a push.. it will make it worse. If you are getting a push with the RB6, you either have a glaring setup issue, or are having a tire/insert issue.
Last thing I have with my car is push, off power or on power. More then likely it is tires up front. I only softening up my rear springs to get rid of chassis bounce on the rutted parts, not to control push. Is your diff too tight?
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