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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 ForumsThread 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 05-31-2014, 10:40 AM
  #10456  
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Does it matter if the car is rear motor or mid motor when it comes to the piston selection and oil weight?
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Old 05-31-2014, 11:28 AM
  #10457  
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yeah. with the weight in a different part of the car you need different suspension settings (springs as well) to get the car to drive like you would want in each setting.
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Old 05-31-2014, 05:47 PM
  #10458  
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Originally Posted by Zylux
Interesting. I'd have thought maybe more % rear than that. My mid motor is about 62.x % at the rear.
I decide to do my MM too with saddles all the way back and I got similar numbers in F=36.5% and R=63.5%.
I may have to look at how I am doing this with one scale
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Old 06-01-2014, 01:44 AM
  #10459  
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Originally Posted by KalEl63
I decide to do my MM too with saddles all the way back and I got similar numbers in F=36.5% and R=63.5%.
I may have to look at how I am doing this with one scale
Wow. That's a lot of rear bias for mm. I have my shorty pushed right back against the motor and can't get near 63.5%. Are you running a full size servo? I guess I did take a lot of weight out of the rear (avid slipper, MIP pucks CVD kit, lightweight chassis etc) but still. What is the total weight of the car?

I use four individual 0.1g scales to do my front/rear left/right measurements. I guess if you are using only one scale you would need to at least place something the same height as the scale under the front wheels. Are both rear wheels able to get onto the scale?
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Old 06-01-2014, 06:16 AM
  #10460  
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Went to 1.5 front 1.6 rear piston with 30/25 losi oil. I liked that pretty good, it allowed the car to be a little more precise.
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Old 06-01-2014, 12:11 PM
  #10461  
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Can someone explain to me why we use different size shock ends. I know it has something to do with droop. Example if I want 27mm in the rear and could achieve this with md or lg ends which should I choose?
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Old 06-01-2014, 12:29 PM
  #10462  
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Originally Posted by Speedychris22
Can someone explain to me why we use different size shock ends. I know it has something to do with droop. Example if I want 27mm in the rear and could achieve this with md or lg ends which should I choose?
It's mostly about the droop, but also the overall shock length.

If you can get 27mm between the bottom of the shock and top of the shock end for both med. and long shock ends, the over all shock length will be a little different. Which would mean that the droop would be different between the two, even though you have 27mm set on either configuration.
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Old 06-01-2014, 12:36 PM
  #10463  
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Originally Posted by Teufel Racing
It's mostly about the droop, but also the overall shock length.

If you can get 27mm between the bottom of the shock and top of the shock end for both med. and long shock ends, the over all shock length will be a little different. Which would mean that the droop would be different between the two, even though you have 27mm set on either configuration.
So for low traction which would u recommend?
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Old 06-01-2014, 01:01 PM
  #10464  
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The difference is drive plunge. The taller the shock end the less CVD plunge on compression which frees up the car.
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Old 06-01-2014, 05:24 PM
  #10465  
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Can someone tell me the overall length of the medium shock end?

Got my car used and only found 2 sizes, not sure what is what.
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Old 06-02-2014, 07:41 AM
  #10466  
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Has anyone tried the brass bulkhead from ghea?
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Old 06-02-2014, 09:50 AM
  #10467  
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Originally Posted by K_King
The difference is drive plunge. The taller the shock end the less CVD plunge on compression which frees up the car.
Have you guys tried using spacers to get rid of the extra droop say for sugar tracks? The excessive droop causes too much roll, I do love the longer ends on rear though.
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Old 06-02-2014, 04:18 PM
  #10468  
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Are u guys using this thread for both mm and rm discussions?
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Old 06-02-2014, 04:42 PM
  #10469  
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Originally Posted by aloksatoor
Have you guys tried using spacers to get rid of the extra droop say for sugar tracks? The excessive droop causes too much roll, I do love the longer ends on rear though.
No just run different shock ends and different droop. No need to put spacers on the inside of the shock. I normally around 20 front 28 rear with shock length "B" medium front long rear shock ends.
My shock set up right now for rm is front 30w 1.3x4 pink spring 20.5 length with med end. Rear 25w 1.3x4 red rear spring 28 length with long end.
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Old 06-03-2014, 01:11 PM
  #10470  
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Originally Posted by eper
Are u guys using this thread for both mm and rm discussions?
Yes.
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