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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
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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 03-07-2013, 04:11 PM
  #5551  
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Originally Posted by ChadBlanton View Post
I'm thinking of turning the steering rack backwards to "calm" the car (it's pretty pointy) this mod pushes the ballstuds back towards the rear of the car ... My question is, why are some guys running a 1mm spacer under the ballstuds on the steering rack? This pushes the studs even further forwards on the car, so wouldn't that make it even more darty?? or am I confused on the whole Ackerman theory
I haven't tested too much with this, but I did measure on my setup station... and the difference in ackerman angle (on a stock facing steering rack) between 0 washers and 1mm washers, was exactly 0. No measurable difference in ackerman angle. Not sure what that means ... it is what it is.

don't forget, you have an easy way to play with ackerman, and that is front toe-in or toe-out. I usually run dead 0, or .5 out. ... so play with 1 or even 2 out and see if that calms the car down. Eventually you start to really develop a slip angle in the front of the car, taking away steering. At some point I will have time to measure ackerman angle with different shims on the rack, and I can publish them. "when I have time" is the key
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Old 03-07-2013, 05:06 PM
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thanks cpt,

anyone else running their steering rack backwards?
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Old 03-07-2013, 05:09 PM
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Mine is backwards and I like it.
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Old 03-07-2013, 06:05 PM
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Pic of the buggies all cleaned up and ready to go for the first round of qualifying at last weekends Bigfoot race here at Mike's.




Last edited by RShockley; 03-08-2013 at 11:13 AM.
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Old 03-07-2013, 06:08 PM
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Love the colors...
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Old 03-07-2013, 06:10 PM
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Originally Posted by RShockley View Post
Pic of the buggies all cleaned up and ready to go for the first round of qualifying at last weekends Bigfoot race here at Mike's.



Have the same cars as well love them to death xb4 and rb6.
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Old 03-07-2013, 09:24 PM
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Originally Posted by Posvar View Post
Mine is backwards and I like it.
I've had good luck with it backwards as well. If u hold to steering racks together ( one forward and one back wards with the hinge mounting holes lined up perfectly) u can visibly see a difference. I tried it backwards and never put it back. I hate to admit this but I finally have my buggy handling similarly to my old rb5 with a +10 mm chassis. It's fast and forgiving. Little more initial and mid corner steering tho.
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Old 03-08-2013, 10:53 AM
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has anyone tried the MIP Diff?
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Old 03-08-2013, 11:06 AM
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Originally Posted by RShockley View Post
Pic of the buggies all cleaned up and ready to go for the first round of qualifying at last weekends Bigfoot race here at Mike's.




I can't see the pics! Have they been deleted?
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Old 03-08-2013, 11:13 AM
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Originally Posted by Posvar View Post
I can't see the pics! Have they been deleted?
Fixed it.
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Old 03-08-2013, 12:15 PM
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Thanks
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Old 03-08-2013, 12:42 PM
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Originally Posted by noworries View Post
has anyone tried the MIP Diff?
I wonder the same. I bought one, but the original one is still so smooth i havnt felt the need to try the MIP yet. Anyone else tried oone yet?
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Old 03-08-2013, 12:45 PM
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my diff is lasting forever too ... pretty awesome stock diff!
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Old 03-08-2013, 01:52 PM
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I have the mip diff outdrives the whole kit for the rear. Longevity is more than the stock swing shafts at least. The diffs similar to the stock one. The hexes are definitely better. The wear seems to be better than the stockers for sure. I will keep running mine not going back to stock.
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Old 03-08-2013, 02:10 PM
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What is the psrt number for the shock ends?
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