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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 07-23-2016, 12:26 AM   #13456
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After spending hours to get it to spin free, it lasted less than 2 runs. I had my doubts about 3D printed parts. I'm sure others have had better results with the stuff. I'm just sharing my experience. I hope there's gear cases on that KYO boat.

It's always better to mod the rear motor trans case for 3 gear MM. 3D printed parts are good in non-stress areas but break easily otherwise.

With that said I'll be replacing all my 3 gear boxes with the 6.6 gear boxes on my old cars. Probably grab the new bulkhead to.
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Old 07-23-2016, 07:48 AM   #13457
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Originally Posted by oPAULo View Post
After spending hours to get it to spin free, it lasted less than 2 runs. I had my doubts about 3D printed parts. I'm sure others have had better results with the stuff. I'm just sharing my experience. I hope there's gear cases on that KYO boat.

My 3D Printed gearbox also didn't last at all. Screws stripped upon install. More screws falling out after some very light use. No RC part should be made with SLA 3D printing. You don't want layers.

I bought my setup from Jason M on facebook, and he was nice and helpful however I'd never buy another one like this.

Really hope there are gear cases on the boat too. Right now my RB6 needs me to re-hack the old rear motor setup...for 3 gear.
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Old 07-23-2016, 07:56 AM   #13458
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I try to support local. I have two great local tracks near me and Sadly one isn't very focused on the sales side of things and unfortunately the other shop just isn't very nice. Not to mention they are too focused on the B6 right now, So I'll order on Amain where they are nice to me.
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Old 07-23-2016, 02:03 PM   #13459
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From a Kyosho Facebook group..

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Old 07-24-2016, 08:15 AM   #13460
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So, are we thinking all of the new 6.6 gear boxes will bolt right into the RB6 without much modification?
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Old 07-24-2016, 10:02 AM   #13461
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So, are we thinking all of the new 6.6 gear boxes will bolt right into the RB6 without much modification?
I sure hope so. My hope came about due to the fact that Jared has been testing with the different transmissions on the orginal RB6 platform. I can't imagine they would re-position the lower holes in the chassis. But if you ask my wife, I have been wrong before...a lot of times.
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Old 07-24-2016, 03:31 PM   #13462
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Originally Posted by Kraig View Post
I sure hope so. My hope came about due to the fact that Jared has been testing with the different transmissions on the orginal RB6 platform. I can't imagine they would re-position the lower holes in the chassis. But if you ask my wife, I have been wrong before...a lot of times.
That's my thoughts exactly! If so, I have no reason to buy the new car...just a few new trannys lol.

I tell my wife "I've only been wrong once, that's the time I thought I was wrong."
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Old 07-24-2016, 11:44 PM   #13463
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Originally Posted by TravisS27 View Post
That's my thoughts exactly! If so, I have no reason to buy the new car...just a few new trannys lol.

I tell my wife "I've only been wrong once, that's the time I thought I was wrong."
Yeah I think they must be aware that the new rear bulkhead is going on the older cars, the access to the rear ball studs was terrible previously. I sincerely hope these trans cases line up. It would be a great disappointment otherwise. Running a modified gear box has been ok but a factory designed setup is always desirable.
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Old 07-26-2016, 02:43 PM   #13464
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Over the last year I've rebuilt the diffs in these buggies several times. SEVERAL. We run pretty much every weekend. Sometimes twice a week. That's 2 fresh diffs at least every 2 months and the gears always look great. I set the diff like Tebo recommends in his video and really don't mess with it. 3/4 to 1 turn on the spin test. I've tried adjusting it but I think I'm still too green to notice the difference. What's everyones opinion on running gear diffs? We generally run medium to high bite indoor but our local track is low bite indoor. Still never really adjust the diff for it though. Would I go longer between rebuilds? I know I've thrown away perfectly good gears with a rebuild just to be safe. Is it just the price of competitive racing?
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Old 07-26-2016, 03:34 PM   #13465
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Originally Posted by oPAULo View Post
Over the last year I've rebuilt the diffs in these buggies several times. SEVERAL. We run pretty much every weekend. Sometimes twice a week. That's 2 fresh diffs at least every 2 months and the gears always look great. I set the diff like Tebo recommends in his video and really don't mess with it. 3/4 to 1 turn on the spin test. I've tried adjusting it but I think I'm still too green to notice the difference. What's everyones opinion on running gear diffs? We generally run medium to high bite indoor but our local track is low bite indoor. Still never really adjust the diff for it though. Would I go longer between rebuilds? I know I've thrown away perfectly good gears with a rebuild just to be safe. Is it just the price of competitive racing?

Gear diffs are good if the grip will support one. You can change the oil to a lighter weight oil for lower grip, but it seems to be better when the grip is up.
They do drive a little different than a ball diff does. If you decide to run a gear diff, make sure you get the option alum diff gear cap, as the plastic ones to tend to leak if you over tighten the screws, and it doesn't take much. They will last longer between rebuilds than a ball diff will for the most part. I've had a gear diff in my 2wd for months and like it for the local racing I do.
I like 4K oil in the gear diff over the 5k if the grip isn't as high, seems to me to work a little better.
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Old 07-26-2016, 08:00 PM   #13466
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I heard that they hit the Kyosho dock today
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Old 07-27-2016, 04:34 AM   #13467
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Default In stock

http://www.kyoshoamerica.com/ULTIMA-...T_p_24505.html

Also alot of the new parts in the wiki are available also.

Last edited by tobamiester; 07-27-2016 at 08:38 AM.
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Old 07-27-2016, 09:03 AM   #13468
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Is the new RF rear hanger ONLY for the laydown? IE - If I want all options for standup and laydown I'll need:

UMW705 - Alu - standup
UMW725 - Brass - standup

UMW705B - Alu - laydown
UMW725B - Brass - laydown

Can anyone verify this?
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Old 07-27-2016, 10:17 AM   #13469
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Originally Posted by fenton06 View Post
Is the new RF rear hanger ONLY for the laydown? IE - If I want all options for standup and laydown I'll need:

UMW705 - Alu - standup
UMW725 - Brass - standup

UMW705B - Alu - laydown
UMW725B - Brass - laydown

Can anyone verify this?
Also wondering the same thing.

From what I understand, the laydown will require 2 holes to be drilled father forward toward the motor? I'm interested in running Kyosho brand diffs in my RB6, do we only need the diff case and rear bulkhead?
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Old 07-27-2016, 10:39 AM   #13470
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Looking at the part and the manual, The new hanger has a little clearance spot on top for the transmission. Take a file to your old one or just buy the B hanger as it would work with both transmissions.
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