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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 05-01-2013, 02:06 PM   #6541
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Mike/bob, you don't need to modify the side pods to mount a reciever there at all. that is where I originally mounted mine, and it mounts just fine as-is. Just put a small strip where it contacts on the bottom, and a small strip where it contacts on the side of the receiver, and it locks in nice and tight. No need to modify anything.
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Old 05-01-2013, 02:07 PM   #6542
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I dremeled one of the side pods and put my receiver there, I wanted the option to move the battery all the way forward if needed.
ummm, no. I wont take a dremel to a Ferrari. That is just sinful.
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Old 05-01-2013, 02:51 PM   #6543
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ummm, no. I wont take a dremel to a Ferrari. That is just sinful.
eehh.. its just a side pod. If you ever changed your mind about the receiver location, replacement pods aren't expensive.
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Old 05-01-2013, 03:16 PM   #6544
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Originally Posted by jordy-15 View Post
jarrod
the best place i have found is rc champ in japan fast postage cheaper and you should be able to get all you need from them
upgrades
the new front hinge pin brace
alu hubs 0 and .5
rear springs gold & white (x-gear)
front white (x-gear)
alu rear susp hangers wide and narrow
the thing is bullet proof so just arms and towers
and you should be set
cheers
so no alloy rear hubs standard?
whats standard spring colors?
why only those colors?
is narrow or wide standard and why do i need both
whats the part # for updated front brace
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Old 05-01-2013, 03:18 PM   #6545
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Originally Posted by Cpt.America View Post
I'm at 1560 with a Fantom 4600 shorty, 551 lowpro servo, alu steering rack, and SXX speedo. Seems to be a good spot in-between being too light for traction, or too heavy for speed in a 17.5. Weight is an important tuning factor. Running a lighter car will increase how nimble the car feels, and it will change direction faster, but overall traction will be lower. Tune your weight for your traction levels to minimize lap times.
Cool thanks guys I will make up my mind sunday on the second chassis . Need to get another shorty servo also...
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Old 05-01-2013, 03:24 PM   #6546
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On my mod buggy (the rb6), my receiver is under the rear shock tower its a lot cleaner for wiring and I can move my battery all the way up if needed (with BLS 551). Ill try to post a pic tonight.
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Old 05-01-2013, 03:44 PM   #6547
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Originally Posted by Jarred King View Post
so no alloy rear hubs standard?
whats standard spring colors?
why only those colors?
is narrow or wide standard and why do i need both
whats the part # for updated front brace
kit is plastic 0deg
kit springs are pink front (super soft) red rear (medium)
white spring = soft
gold spring =medium/soft
kit hanger are plastic wide and prone to breaking. narrow for a tuning option
kyo um720b
hope this helps
cheers
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Old 05-01-2013, 03:48 PM   #6548
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thanks bud
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Old 05-01-2013, 03:55 PM   #6549
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is steering rack alloy standard?
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Old 05-01-2013, 03:55 PM   #6550
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red spring says MED/HARD lol
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Old 05-01-2013, 04:02 PM   #6551
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Quote:
Originally Posted by Cpt.America View Post
I'm at 1560 with a Fantom 4600 shorty, 551 lowpro servo, alu steering rack, and SXX speedo. Seems to be a good spot in-between being too light for traction, or too heavy for speed in a 17.5. Weight is an important tuning factor. Running a lighter car will increase how nimble the car feels, and it will change direction faster, but overall traction will be lower. Tune your weight for your traction levels to minimize lap times.
Hrm. I'm having issues getting mine as light as you guys. I'm at 1600 (RM) with the lid and wheels on.
- Exotek steering bits (rack and the other bit)
- Exotek rear bulkhead
- Viper VTX10
- Reedy 17.5
- Intellect 4600/80C shorty
- KO One10
- KO KR411FH
- RC4 Hybrid
- bulldog body/wing
- Front K wheels w/ rips
- Rear Avid wheels /w losi bigshots

I've got lunsford turnbuckles and ballstuds I could put on, but I doubt that will shed 50g. Maybe it's not that much of an issue, given im outdoors dirt...


Quote:
Originally Posted by Jarred King View Post
so no alloy rear hubs standard?
whats standard spring colors?
why only those colors?
is narrow or wide standard and why do i need both
whats the part # for updated front brace
I'd still get 0 deg hubs, but I've broken rear hubs on previous K cars before. I think the general consensus was that the RB6 rear hubs had been strengthened (but the P/N remained the same?)

I'd hesitate going white rear (medium soft) white front on aus tracks. This is 2 steps softer rear and 1 step harder front.

Gold rear is worth picking up (medium).

Standard is Red rear (medium hard) and pink front (soft).

wide suspension hangers are standard. Gives you more steering/less rear grip. I use these as tuning. Good for getting a medium size effect in rear grip. Wide aluminium hangers in these may be a bit difficult to get (actually nbhc just got the Yaiba brand ones). You will need alu hangers if you hook the rear on something at speed. May break the plastic hanger.
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Old 05-01-2013, 04:03 PM   #6552
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Originally Posted by Jarred King View Post
is steering rack alloy standard?
nah. plastic.
NBHC also have the yaiba racks now...
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Old 05-01-2013, 04:27 PM   #6553
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silvalis- the viper is pretty heavy and the alum exotek rear bulkhead is too, wires can also be heavy. shorty servos are much lighter than standard too.
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Old 05-01-2013, 04:33 PM   #6554
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Originally Posted by ryanpatrickgore View Post
silvalis- the viper is pretty heavy and the alum exotek rear bulkhead is too, wires can also be heavy. shorty servos are much lighter than standard too.
I was able to shed the weight with the shorty servo and trimming the wires.
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Old 05-01-2013, 04:57 PM   #6555
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Originally Posted by ryanpatrickgore View Post
silvalis- the viper is pretty heavy and the alum exotek rear bulkhead is too, wires can also be heavy. shorty servos are much lighter than standard too.
The VTX10 (not the R and not the BE) is only 47g. Mine's jammed under the bulkhead, caps removed (a 4X capset soldered on and placed next to the shorty) with short wires to the battery. I guess i could go down to 14AWG or 16AWG wire...

Also the RSX One10 is a short servo. Bit heavier than the BLS551 though.

I'll try going back to the plastic bulkhead


Oh. I've got the front exotek bulkhead too. Maybe go back to plastic there.
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