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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 ForumsThread 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 01-11-2013, 02:38 AM
  #4141  
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Originally Posted by Cpt.America
If I were running a mid motor car on a VERY high traction track, like turf or carpet, I would have my car down as light as I could get it, with a shorty. Id be running right at 1499. Weight generates traction, and slows reaction. On carpet, where you tend to dial out traction with roll center changes, ride height, and tires.... you don't need the weight of the heavier pack. Run a heavy pack on loose outdoor dirt tracks to generate more grip, run a light battery on carpet to reduce grip.
You want to slow the reaction on high grip!

Problem with running low weight is keeping the nose down. So you'd mount the shorty up front, then you end up generating too much front end!

Saddles with no weight added seems to be the best setup for me so far. Have added up to 70g under the lipo, but took it out, as the car felt a little sluggish. With a shorty I found the car to be too light and unstable.
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Old 01-11-2013, 08:40 AM
  #4142  
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First Kyosho Hop up came out.

UMW701 - Aluminium Steering Plate.

No Pics yet.
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Old 01-11-2013, 09:19 AM
  #4143  
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What is the differance between the narrow and wide rear arm holder?
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Old 01-11-2013, 09:25 AM
  #4144  
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Originally Posted by Dale.0
What is the differance between the narrow and wide rear arm holder?
From my understanding the wide holders free up the car a little meaning less rear traction.
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Old 01-11-2013, 09:27 AM
  #4145  
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Originally Posted by Dale.0
What is the differance between the narrow and wide rear arm holder?
Track width, and roll center. Search this thread for more info, it's been discussed quite a bit. Hopefully we can take over post#1 on the thread so we can put all basic info in one place to have an easy place to guide repeat questions to.

In short, a wider track raises roll center, hindering roll, and therefor hinders traction gain on that end of the car. Narrower track has opposite affect.
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Old 01-11-2013, 10:01 AM
  #4146  
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Guys, a while back I had provided some stats of springs I've done. I got an RB5WC that comes w/ "kit" xgear springs in pink front and red rear. I tested them as there was confusion if the rates were the same. What I found was the pink kit fronts (3.053 lb/in) were signifgantly softer than my non kit xgear pink fronts (3.272 lb/in). Now for the red rears I do not have a non kit xgear to test but I do have a yellow xgear. See the attached document.
Attached Files
File Type: pdf
RC Spring rates.pdf (99.6 KB, 186 views)
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Old 01-11-2013, 10:07 AM
  #4147  
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FYI the springs that came on the RB5 WC weren't xgear springs, nor did they have colors.
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Old 01-11-2013, 10:12 AM
  #4148  
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Ok, I'm unsure what they are then. They have the same coating/coloring as my xgear. Did the RB6 come w/ the xgear then?

Dave
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Old 01-11-2013, 10:19 AM
  #4149  
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Originally Posted by TT_Vert
Did the RB6 come w/ the xgear then?

Dave
yep...

their coating was similar, and unless my memory has started failing (which is likely!), there weren't colors on them. Do I have that wrong? anybody confirm?
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Old 01-11-2013, 10:30 AM
  #4150  
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RB5 SP2 WC: The kit FR springs had blue markings on them (mine and a few others I saw locally at least), no markings at all on Rr springs. I did feel that the WC's (blue) fronts, felt stiffer than the X-Gear pink springs I had previously. I use them as an option in between the X-Gear Pink & White fronts...

RB6: X-Gear Springs included in kit, Pink FR, Red RR (both have paint dabs on them)
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Old 01-11-2013, 10:32 AM
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Well then I have no idea what I have. They came off a used RB5SPWC I got, They look like xgear springs and have pink/red marking on them.

Dave
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Old 01-11-2013, 10:42 AM
  #4152  
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Originally Posted by TT_Vert
Well then I have no idea what I have. They came off a used RB5SPWC I got, They look like xgear springs and have pink/red marking on them.

Dave
Those sound like run-of-the-mill Xgear springs. A lot of us WC drivers tossed the kit springs and bought new xgears for the car.
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Old 01-11-2013, 10:49 AM
  #4153  
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Brandon,

Your request has been sent....waiting on reply.

Matt
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Old 01-11-2013, 10:51 AM
  #4154  
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Thanks!!!!!!!

Last edited by Posvar; 01-11-2013 at 11:32 AM.
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Old 01-11-2013, 10:56 AM
  #4155  
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Originally Posted by Posvar
Brandon,

Your request has been sent....waiting on reply.

Matt
Thanks Matt... i think it will be helpful.

Originally Posted by Posvar
Totally random question but I want to make my avitar a kyosho logo and can't seem to figure it out. Lol.

Any thoughts from you avitar K specialists?

Matt
Ill make you one, PM me.
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