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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(0į/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 01-21-2018, 05:10 PM
  #14596  
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Originally Posted by hairymuffin View Post
I guess you know more than the rest of us? I have very little weight added to my car, but I do have the brass rf block(weight). Also, we are not all on the same type of surface, not to mention stock vs mod. It kinda hard to give advice on setup when we don’t know all the little details.
I don't know as much as I want that's for sure. That's why I used my experience to steer drivers with the same issue towards the better way, of course if the driving and building skill are there my advice is more relatable.

Originally Posted by hairymuffin View Post
This is not a yokomo but some of their mod setups have as much as 126g of weight... not sure what other brand of cars guys are adding weight?
Depends on a lot of stuff. CG placement, managing inertias and stiffnesses... Remember when we went from nimh to lipo and everyone was adding weight to make the cars weight as much as before? Then the cars lost the weight because the correct stiffnesses were found and now we are doing the same, closer and closer to the minimum weight.

Last edited by 30Tooth; 02-01-2018 at 04:22 PM. Reason: typo
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Old 01-21-2018, 06:38 PM
  #14597  
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30, donít take any offense to my comments. I donít think you did, but just in case
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Old 01-22-2018, 03:08 AM
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Originally Posted by hairymuffin View Post
30, donít take any offense to my comments. I donít think you did, but just in case
We are good, hope I didn't come across wrong to you.
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Old 01-22-2018, 08:19 AM
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Nope we are good, appreciate your input
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Old 01-25-2018, 08:15 PM
  #14600  
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Any of you guys run shock tower protectors? Saw some on Shapeways but for the b6. My new carpet track requires them on buggies
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Old 01-26-2018, 08:04 AM
  #14601  
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I know that some guys have cut up plastic bottles and bolted them to shock towers. That was before 3d printing took off.
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Old 01-26-2018, 08:07 AM
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Originally Posted by oPAULo View Post
I don't know. I just don't know. It's just really obvious to me that AE made their unsprung weight heavier on purpose. Their hubs and carriers are way bigger than they need to be. I feel like it's dependant on the tire. A balance. More unsprung will force the tire to absorb the bump rather than deflect? I think of a heavy tire versus a light tire rolling on a track. Which one will bounce off the bumps and which one will absorb them?

Anyway I'm testing it. 10 grams bolted to the hub.

I can't believe I'm seeing this. I did the exact same thing and... It drastically changed the grip. Unfortunately, for me, I couldnt get the feel right and it did have slower lap times. AE hubs are significantly heavier than kyosho hubs. Hey, adding weight to the hubs was money on the 1/8th scale...
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Old 01-30-2018, 02:53 AM
  #14603  
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Default b6 gullwing arm mod

Originally Posted by powerpig View Post
I use the associated B6 gull wing arms (part #ASC91674) with yellow hard springs and 37.5 w in front. Steering feels less aggressive and able to get very low ride height without compromising shock setup. Not sure what kind of pics your looking for.



hi. thanks for the pics. I'm looking for pics that show what spacers go where and what needs to be drilled out or cut to make the arms work.
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Old 01-30-2018, 09:30 AM
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Was going to go battery strapless, but decided not to. Cutting the water fall ads a lot a chassis flex. I mounted industrial strength Velcro but the battery is not stable, it moves around,although I doubt it would come out in a hard landing.. I did the tape thing in my yokomo, but I still think itís a bad idea.
Attached Thumbnails Kyosho Ultima RB6 & RB6.6 Car Thread-f080d887-bc9c-4122-bc93-2632ed98d403.jpeg  
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Old 01-31-2018, 02:27 AM
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Originally Posted by hairymuffin View Post
Was going to go battery strapless, but decided not to. Cutting the water fall ads a lot a chassis flex. I mounted industrial strength Velcro but the battery is not stable, it moves around,although I doubt it would come out in a hard landing.. I did the tape thing in my yokomo, but I still think itís a bad idea.
what steering knuckles are those? and what do the ae steering rod ends do for the car? and why the ae rod ends/ball cups?
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Old 01-31-2018, 06:00 AM
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Originally Posted by k_chris View Post
hi. thanks for the pics. I'm looking for pics that show what spacers go where and what needs to be drilled out or cut to make the arms work.



Only Spacers: 1.25mm back of bulkhead, 1mm in front Shock, 4mm back of carrier.
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Old 01-31-2018, 01:58 PM
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Originally Posted by k_chris View Post
what steering knuckles are those? and what do the ae steering rod ends do for the car? and why the ae rod ends/ball cups?
Never had an issue with the kyosho ball cups,just went for a different look, I didn’t know the ae ball studs were 5.5 lol... steering nuckles are old rb5. I had a bunch of them so I run them,they are weaker than the newer ones,rb6 has the webbing. This car started life as an 1st gen rb5 10yrs ago. Upgraded over the years.. hence the blue shock collars,never felt like I needed to buy a new car
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Old 02-01-2018, 01:06 AM
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Originally Posted by hairymuffin View Post
Never had an issue with the kyosho ball cups,just went for a different look, I didnít know the ae ball studs were 5.5 lol... steering nuckles are old rb5. I had a bunch of them so I run them,they are weaker than the newer ones,rb6 has the webbing. This car started life as an 1st gen rb5 10yrs ago. Upgraded over the years.. hence the blue shock collars,never felt like I needed to buy a new car
haha, nice. thanks for the info. good to know/think I'm not missing anything. good job keeping it going..wow
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Old 02-01-2018, 01:07 AM
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Originally Posted by powerpig View Post


Only Spacers: 1.25mm back of bulkhead, 1mm in front Shock, 4mm back of carrier.
thank you soo much, it took me a minute to get this info
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Old 02-01-2018, 02:45 PM
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Looks like a couple new parts coming soon

UMW737 Carbon Composite Front Bulkhead





UMW738 Carbon Composite Front Upper Plate




KYOSHO RC MODEL February 2018 - NEW ITEM
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