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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 11-01-2015, 09:42 AM   #12661
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Also has anyone compared the Exotek Titanium to the Lunsford? Exotek is about half the price...
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Old 11-01-2015, 10:16 AM   #12662
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Spacers on the left are kit plastic spacers. Spacer on the right are what you get if you order new kit axles KYOUM569. 2MM outer spacer. All wheels fit with a 2MM outer spacer.



But remember, a wider front track width will take away steering. You only need to chamfer the corners of the wheel hex for clearance. No big deal. All the cool kids do it.

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Old 11-01-2015, 11:35 AM   #12663
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Thanks oPaulo Yeah I seem to remember this discussion coming up before, I'll go back and read some more of the comments from before too. I was mostly wondering if any of the aftermarket wheels would be similar to the stock KYO.

I also understand the steering aspect, changing the width of the car changes the roll center a bit. Wider is a bit more stable, narrower a bit more steering. I've been running with a 1mm spacer and my JC Inverse wheels fit great. It seems I can go as narrow as .5mm per side without an issue.

BTW, Thanks for the Bulkhead!
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Old 11-01-2015, 11:53 AM   #12664
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Ah I've never had a need for more steering so never thought to go that narrow.
What a guy needs is a counter bore tool with a pilot that fit the bolt hole and knock the wheel hex down to clear the hub.

I looked through all my wheels and I have DE and JC bullets that are thin like a KYO wheel. They specifically call out for a B5 or RB6 though. P# 3362W
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Old 11-01-2015, 12:05 PM   #12665
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The Sweep wheels seem to clear fine without trimming, but are a bit deeper then stock. If I remember right, AKA wheels have a shallow hex pretty close to Kyosho.
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Old 11-01-2015, 12:14 PM   #12666
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These AKA wheels are not shallow hex even though they say they're for KYO.

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Old 11-01-2015, 05:04 PM   #12667
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Where can I find the fancy battery/chassis brace for running sideways shorty packs?
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Old 11-01-2015, 05:28 PM   #12668
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Quote:
Originally Posted by whitrzac View Post
Where can I find the fancy battery/chassis brace for running sideways shorty packs?

http://mckunedesign.com/
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Old 11-01-2015, 05:32 PM   #12669
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I tried the battery sideways on the RB6 and hated it, way too much roll mid corner and off jumps, and if the car didn't land squared up of a jump it got very unsettled.... definitely changing back to inline.
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Old 11-01-2015, 05:40 PM   #12670
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Quote:
Originally Posted by symmetricon View Post
I tried the battery sideways on the RB6 and hated it, way too much roll mid corner and off jumps, and if the car didn't land squared up of a jump it got very unsettled.... definitely changing back to inline.
Really? What type of surface do you run on?
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Old 11-01-2015, 05:54 PM   #12671
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Really? What type of surface do you run on?
We run on clay with DirtGlue sprayed on it, it's super high bite....
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Old 11-01-2015, 06:08 PM   #12672
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Quote:
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We run on clay with DirtGlue sprayed on it, it's super high bite....
Ah this makes sense, I run on medium bite top soil, and occasionally relatively high bite clay mix and have found the sideways battery to settle the car and help it to create the forward bite necessary, otherwise the car likes to wiggle and not settle as easily
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Old 11-01-2015, 07:01 PM   #12673
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Quote:
Originally Posted by oPAULo View Post
These AKA wheels are not shallow hex even though they say they're for KYO.

Avid fits great for the record.
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Old 11-02-2015, 04:47 AM   #12674
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Quote:
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I tried the battery sideways on the RB6 and hated it, way too much roll mid corner and off jumps, and if the car didn't land squared up of a jump it got very unsettled.... definitely changing back to inline.
Indeed, totally agree.

Also dumbs down the steering reaction a fair chunk too.
Guess it's all down to driving style and surface, I'll run shorty across in VERY slippery conditions but slightly forward so ESC still between it and motor and then go back to inline ASAP.
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Old 11-02-2015, 09:44 AM   #12675
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Has anyone done front to rear weight balance measurements with sideways vs inline batteries? Let's assume that we'd try to have near even left to right balance I wonder how different they are. Lots of variation I would imagine with different components and also in sideways it seems like you can move a lot more weight towards the rear of the car. I'm currently running my setup inline with ESC and receiver behind servo in between battery. I have the battery moved up against the ESC and receiver and it could be moved back one position on the chassis. I've found it jumps better and I have plenty of forward bite already. Most of the tracks I run on are indoor clay type, OCRC, SDRC, SCVRC, etc I'll post pics later.
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