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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 03-01-2013, 02:55 PM   #5446
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Originally Posted by Speedychris22 View Post
Hi guys got a gearing question? I will be running Team Orion 13.5T motor in my rb6, someone told me to run 26/75 on the gearing but I see the best I can do is 25/76. He mentioned to get a 27 tooth pinion gear as well but I dont see that Kyosho makes them. Any advise or what would you guys run on a tight indoor track?
Run a smaller spur, no biggy. Try something like 72/27-28. The first thing I did when I switched to Kyosho, was ditch the kyosho spurs and slipper pads for this very reason. I now run Kimbrough spur gears, and AE pads. AE pads are cheap, work well, and are easy to find... as are the spurs (and you can get any gearing you want with them). The Kimbrough spurs are quiet, and perfectly round... can't beat em.

http://www.amainhobbies.com/index.ph.../filter_mfr/85

http://www.amainhobbies.com/product_...pper-Pad-B4-T4
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Old 03-01-2013, 03:13 PM   #5447
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Originally Posted by Cpt.America View Post
Run a smaller spur, no biggy. Try something like 72/27-28. The first thing I did when I switched to Kyosho, was ditch the kyosho spurs and slipper pads for this very reason. I now run Kimbrough spur gears, and AE pads. AE pads are cheap, work well, and are easy to find... as are the spurs (and you can get any gearing you want with them). The Kimbrough spurs are quiet, and perfectly round... can't beat em.

http://www.amainhobbies.com/index.ph.../filter_mfr/85

http://www.amainhobbies.com/product_...pper-Pad-B4-T4
awsome I am assuming I can still run the Kyosho Pinion gears?
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Old 03-01-2013, 03:25 PM   #5448
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yep. as long as they are 48 pitch
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Old 03-01-2013, 03:28 PM   #5449
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yep. as long as they are 48 pitch
great thanks guys.
Also anyone running the Avid System? is it worth it?
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Old 03-01-2013, 03:42 PM   #5450
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Hell yeah on the Avid slipper.
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Old 03-01-2013, 04:22 PM   #5451
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Im running one.
Bit more consistent than a regular slipper I think. Not quite as easy to set up though.

I'd go an avid over an rb6 slipper, but i'm not sure i'd bother if you had the rb5wc vented plates in...
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Old 03-01-2013, 05:57 PM   #5452
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Yes, and making this adjustment makes your camber length longer or shorter, changing your roll center, camber gain, etc. If it's .5mm at each side, probably not a big impact, if it's 1.5+mm that equivalent to one of the offset holes on the option hubs. I just wonder if the shorter link achieved when going wider is a bigger influence on the steering gained than the actual width. (could be tested by shimming at the hex instead).
I measured them a while back and it 1mm per side. I have also tried shimming at the hex as well. Same effect as wide blocks but about half as strong in effect. You need kyosho wheel with serrated nut to do this. As its a very quick change its a nice option to respond to a changing track.
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Old 03-01-2013, 09:41 PM   #5453
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I measured them a while back and it 1mm per side. I have also tried shimming at the hex as well. Same effect as wide blocks but about half as strong in effect. You need kyosho wheel with serrated nut to do this. As its a very quick change its a nice option to respond to a changing track.
The narrow to wide blocks has to have another effect due to the pivot point. I ran the narrow caster blocks up front with RB5 axles/clamp hexes and found no loss of steering but much smoother and predictable steering. Width was about the same, but the pivot changes. On-road guys have done similar changes.
You could try narrow blocks with SC-R 3 line axles and shim 1mm to the inside to be equal to wide blocks. Use 1.5mm inside for for a little less rotation or stock axles for max rear grip. I found that 2mm inside on SC-R axles makes the dogbone rub on the outdrive at full compression. Just another tuning option.
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Old 03-01-2013, 10:19 PM   #5454
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The narrow to wide blocks has to have another effect due to the pivot point. I ran the narrow caster blocks up front with RB5 axles/clamp hexes and found no loss of steering but much smoother and predictable steering. Width was about the same, but the pivot changes. On-road guys have done similar changes.
You could try narrow blocks with SC-R 3 line axles and shim 1mm to the inside to be equal to wide blocks. Use 1.5mm inside for for a little less rotation or stock axles for max rear grip. I found that 2mm inside on SC-R axles makes the axles rub on the outdrive at full compression. Just another tuning option.
Is there any shimming required when using the rb5 axles? If so what?
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Old 03-01-2013, 11:05 PM   #5455
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Haha I thought we were talking rear hing pin holders not front caster blocks. Front blocks are next on my list to test if the rain ever stops. Good info but.
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Old 03-02-2013, 01:39 AM   #5456
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Originally Posted by Yeti AS3 View Post
The narrow to wide blocks has to have another effect due to the pivot point. I ran the narrow caster blocks up front with RB5 axles/clamp hexes and found no loss of steering but much smoother and predictable steering. Width was about the same, but the pivot changes. On-road guys have done similar changes.
You could try narrow blocks with SC-R 3 line axles and shim 1mm to the inside to be equal to wide blocks. Use 1.5mm inside for for a little less rotation or stock axles for max rear grip. I found that 2mm inside on SC-R axles makes the axles rub on the outdrive at full compression. Just another tuning option.
This is good true advice. A set of 5x7x1mm Aluminum Collars(W0149GM) and the 3 line axles (UM510-02) is what you will need to space the hexs out 1mm each side when using the narrow rear RF blocks.
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Old 03-02-2013, 02:57 AM   #5457
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mikexray the rf block [email protected] 41mm from outside of hole to hole the rf2 is 43 so its a 2mm difference..
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Old 03-02-2013, 06:15 AM   #5458
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Is there any shimming required when using the rb5 axles? If so what?
I used 1mm on the inside and zero shims outside.
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Old 03-02-2013, 06:17 AM   #5459
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I used 1mm on the inside and zero shims outside.
Thanks man. And you were saying that with your setup width was the same as running the rb6 axles in the wide configuration?
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Old 03-02-2013, 07:05 AM   #5460
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Thanks man. And you were saying that with your setup width was the same as running the rb6 axles in the wide configuration?
Just measured it. The rb5 setup actually increases the track width by 1mm per side. It feels real good on high bite.
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