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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 02-17-2018, 08:17 PM
  #14656  
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Thanks guys for helping with my carpet setup. Changing to the medium rear shock eyelets really helped with wheel lift,also helped a lot with getting the ride height lower. Also went outside hole on front tower, which help with push. But my main problem is front tires(prolines), Tessmannís were at my track,his dad told me to narrow the front wheels. I know Schumacher is the ticket for fronts but I have to rep pl tires
Attached Thumbnails Kyosho Ultima RB6 & RB6.6 Car Thread-5f0e01e8-b481-4187-adc1-88886afadae6.jpeg  
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Old 02-17-2018, 08:31 PM
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Originally Posted by jamsandolina View Post
I'm thinking of getting a rb6.6 readyset for my daughter for indoor carpet track. How is this buggy? Does it come with a ball diff or gear diff? Should the shocks be rebuilt right out of the box? Any info or advice would be great? Thanks
Not sure about the ready set out the box. Some thinks depends on if your daughters skill level,whether or not she needs some of the upgrades. Iím thinking that it might come with a gear diff which is a plus. Not sure what to do about the shocks, itís a rtr so I wouldnít expect a good setup out the box. If you ever change springs, kyosho springs are good but yokomo/associated is half the price and good. But without spending money so soon,get tires and advice from these guys as far as hub and shock locations. Just these things make a big difference on carpet.. plus springs
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Old 02-18-2018, 04:20 AM
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Originally Posted by jamsandolina View Post
I'm thinking of getting a rb6.6 readyset for my daughter for indoor carpet track. How is this buggy? Does it come with a ball diff or gear diff? Should the shocks be rebuilt right out of the box? Any info or advice would be great? Thanks
I got the 6.6 rtr for my son last October. It comes with a gear diff. To get it carpet ready we changed the tires almost after the first pack. We use Schumacher minipin 2's blue on the rear and Cut staggers blue on the front. After a couple more packs we went with a stiffer spring in the front kyosho red and two hole pistons front and rear. Most of the setup I use is here http://site.petitrc.com/setup/kyosho...Arena20170604/

Oh and definitely check your temps. I know once the kid started getting a hang of it we had to go with the smallest pinion around 18-19t to get the motor to run cool enough. The brushed system didn't last long maybe 3-4 track days around lipo 20 packs about 6 minutes run time each. I didn't replace the brushed motor I found a 3000kv D-Drive and stuck that in its place.

Have fun with it! Works good after a few setup changes.
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Old 02-18-2018, 04:20 AM
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Originally Posted by jamsandolina View Post
I'm thinking of getting a rb6.6 readyset for my daughter for indoor carpet track. How is this buggy? Does it come with a ball diff or gear diff? Should the shocks be rebuilt right out of the box? Any info or advice would be great? Thanks
I bought the readyset rb6.6 for my son and he loves it. The key changes were new tires (advice from local track drivers) and adjusting shock mount points and a few tie rod length/locations to lower it and improve handling (check out the petitrc website for rb6 setups to get started) This is the first time Iíve been back to rc racing since when I was a kid running the gold pan rc-10. Iím sure we have a lot to learn and adjust, but we are having fun.
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Old 02-18-2018, 05:55 AM
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Originally Posted by hairymuffin View Post
Thanks guys for helping with my carpet setup. Changing to the medium rear shock eyelets really helped with wheel lift,also helped a lot with getting the ride height lower. Also went outside hole on front tower, which help with push. But my main problem is front tires(prolines), Tessmannís were at my track,his dad told me to narrow the front wheels. I know Schumacher is the ticket for fronts but I have to rep pl tires
Yeah, you want to narrow the wheels. Just use some body scissors and cut the inside of the rim, up to the inner bead rib. Mount the tire using that as the outer bead rib.Only about A quarter inch is what you're taking off.

Let me know if that makes sense.
hairymuffin and eper like this.
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Old 02-18-2018, 08:36 PM
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Does anyone know if the new RB6.6 body will fit a RB6 in mid motor configuration? Or is the new chassis substantially wider where it would be loose?
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Old 02-18-2018, 08:44 PM
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Originally Posted by watzonee View Post
Does anyone know if the new RB6.6 body will fit a RB6 in mid motor configuration? Or is the new chassis substantially wider where it would be loose?
It will fit. The 6.6 body has cut outs to fit various tranny configurations, 3/4 gear standup,laydown, rear motor, you name it
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Old 02-18-2018, 08:48 PM
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Originally Posted by hairymuffin View Post
It will fit. The 6.6 body has cut outs to fit various tranny configurations, 3/4 gear standup,laydown, rear motor, you name it
Nice thanks man...
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Old 02-21-2018, 12:35 PM
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Has anyone ran the B6 fullwing front arms on the 6.6 with the stock front shock tower? would it work better with a JTP v2 tower ?
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Old 02-21-2018, 04:05 PM
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Proline body for the yz2, looks ok and fits every where except the front
Attached Thumbnails Kyosho Ultima RB6 & RB6.6 Car Thread-f61b275d-e812-40a5-ba32-d5009c35c35e.jpeg  
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Old 02-22-2018, 09:34 AM
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Xray XB2 - Setup Helper
This is really helpful, xray has to be the king of setup help. But not a fan of their cars
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Old 02-23-2018, 02:00 PM
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Originally Posted by hairymuffin View Post
Xray XB2 - Setup Helper
This is really helpful, xray has to be the king of setup help. But not a fan of their cars
Wow that is outstanding!! Thanks for sharing!

My buggy was so bad last week I'm going to try some wholesale changes. Our local track is just weird. Sometimes on a super soft tire, sometimes clay compound. All the fast guys run laydown trans no matter what so I can't bring myself to do a standup trans. I struggle with forward bite and side bite. Last weekend I had almost 100 grams of lead piled on just trying to make it stick. They were all on clay compound but I was ice skating on them. Only slightly better with super soft.
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Old 02-23-2018, 04:57 PM
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Originally Posted by oPAULo View Post
Wow that is outstanding!! Thanks for sharing!

My buggy was so bad last week I'm going to try some wholesale changes. Our local track is just weird. Sometimes on a super soft tire, sometimes clay compound. All the fast guys run laydown trans no matter what so I can't bring myself to do a standup trans. I struggle with forward bite and side bite. Last weekend I had almost 100 grams of lead piled on just trying to make it stick. They were all on clay compound but I was ice skating on them. Only slightly better with super soft.
What degree of toe are you running? That sheet I posted should help
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Old 02-25-2018, 03:46 PM
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im running the kit supplied rear hubs on mine and dont have any issues, it drives like a slot car basically
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Old 02-26-2018, 10:32 AM
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Originally Posted by oPAULo View Post
Wow that is outstanding!! Thanks for sharing!

My buggy was so bad last week I'm going to try some wholesale changes. Our local track is just weird. Sometimes on a super soft tire, sometimes clay compound. All the fast guys run laydown trans no matter what so I can't bring myself to do a standup trans. I struggle with forward bite and side bite. Last weekend I had almost 100 grams of lead piled on just trying to make it stick. They were all on clay compound but I was ice skating on them. Only slightly better with super soft.
Where did you place the weight? It isn't to far back where you could have a pendulum affect is it? With all that weight, once you get off throttle it will shift towards the front of the car which can make the rear feel light.

Rather than trying to add grip to the rear of the car, have you thought about trying to take away front grip?

Other things to check for forward grip, slipper setting, radio throttle settings, and speed control settings. What works for some may not work for you.
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