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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 03-15-2013, 01:56 PM   #5686
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Quote:
Originally Posted by MikeXray View Post
Why not just sand off the shiney layer?
yeah, we do some sanding... but its still not quite teh same as being broken in on the track.
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Old 03-16-2013, 09:54 AM   #5687
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Quote:
Originally Posted by desertracerdad
The flat/rear arms UM521, UM521-1 or UM566 work best on higher traction layouts. They lock the rear end in more and provide a more consistent feel in corners. If you do have a track where you can run these, make sure to use the medium rear shock eyelets so you can achieve the correct amount of droop & ride height. Also, you will only have 1mm of spacing between the arm and rear suspension holders (not 2mm like the kit UM713 arms). I tested in front & behind the arm and for 17.5 & 13.5, prefer the 1mm behind the arms (which is to the rear bumper).

Difference between the above three rear arms is:
UM521 = 2 hole Rr arm with RB5 SP Fr arms
UM521-1 = 1 hole Rr arm with RB5 SP2 Fr arms
UM566 = 2 hole Rr arm (same rear as UM521) with RB5 SP2-WC Fr arms
are all these are the exact same length? In other words, are all the rears the same except the shock positions?



So are the shock mounting holes different?

I have 521/566 rears but not the 521-1
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Old 03-16-2013, 03:53 PM   #5688
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Quote:
Originally Posted by mikeyscott View Post
Quote:
Originally Posted by desertracerdad
The flat/rear arms UM521, UM521-1 or UM566 work best on higher traction layouts. They lock the rear end in more and provide a more consistent feel in corners. If you do have a track where you can run these, make sure to use the medium rear shock eyelets so you can achieve the correct amount of droop & ride height. Also, you will only have 1mm of spacing between the arm and rear suspension holders (not 2mm like the kit UM713 arms). I tested in front & behind the arm and for 17.5 & 13.5, prefer the 1mm behind the arms (which is to the rear bumper).

Difference between the above three rear arms is:
UM521 = 2 hole Rr arm with RB5 SP Fr arms
UM521-1 = 1 hole Rr arm with RB5 SP2 Fr arms
UM566 = 2 hole Rr arm (same rear as UM521) with RB5 SP2-WC Fr arms
are all these are the exact same length? In other words, are all the rears the same except the shock positions?



So are the shock mounting holes different?

I have 521/566 rears but not the 521-1
Yes, the 521-1 is the inbetween hole of the 2 on the 521.
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Old 03-16-2013, 05:56 PM   #5689
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^^^^^ Correct ^^^^^
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Old 03-16-2013, 06:19 PM   #5690
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Are the aluminum rear hubs a necessary upgrade
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Old 03-16-2013, 07:55 PM   #5691
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Are the aluminum rear hubs a necessary upgrade
They are not necessary, but if you race competitively they are a good upgrade as they have a larger outer bearing for durability. I have never seen anyone break a stock plastic hub, but for that added sense of security, we run them. Plus you have two more camber link mounting positions with the alum hubs.
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Old 03-16-2013, 10:41 PM   #5692
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Just saying to the people saying "sugar makes traction? Wow!" It doesn't, it helps with traction it makes the dirt at srs hold up and the dirt doesn't brake up much like other grooved tracks so sugar helps with traction it doesn't make u have traction it helps if that makes sense.
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Old 03-16-2013, 11:43 PM   #5693
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Are the aluminum rear hubs a necessary upgrade
Only on the RB5/RT5/ZX5 - wasn't too hard to break one by cartwheeling. The RB6 rear hubs are more durable. That being said, you can use RB6 hubs on the others...
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Old 03-17-2013, 10:01 AM   #5694
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Does anyone know of an Aluminum Servo Horn that fits the RB6? My RB5 horn doesn't work and I stripped a plastic one recently. Thanks
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Old 03-17-2013, 10:28 AM   #5695
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Originally Posted by JEFF.777 View Post
Just saying to the people saying "sugar makes traction? Wow!" It doesn't, it helps with traction it makes the dirt at srs hold up and the dirt doesn't brake up much like other grooved tracks so sugar helps with traction it doesn't make u have traction it helps if that makes sense.
It does help the track stay together and significantly reduces the labor of track maintenance. But, it also adds traction, alot. Were you there last year? are you there this year? Last year they did nothing to the track except let it groove, it was slick, no one tire worked very well at all. For a blue groove track with the sun out and baking it...it didnt have the amount of traction it should have. Adding the sugar and then watering it into the dirt makes the dirt feel like sandpaper. Do you really think they would be running mid motor cars if it didnt add traction?

Good win for Tebo in A1, here is the video:
http://www.youtube.com/watch?feature...&v=2yws2HiesKU
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Old 03-17-2013, 12:08 PM   #5696
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Good win for Tebo in A1, here is the video:
http://www.youtube.com/watch?feature...&v=2yws2HiesKU
Uhm.. Tebo and the 6 looked amazing. But am I the only one that thinks there was some dirty driving in that race by the other guys in the front? Cav took one in the kiester, with no lube, 4 feet before the finish line. wth?

(edit: I spy gil losi jr, there at the end! )
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Old 03-17-2013, 12:32 PM   #5697
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Uhm.. Tebo and the 6 looked amazing. But am I the only one that thinks there was some dirty driving in that race by the other guys in the front? Cav took one in the kiester, with no lube, 4 feet before the finish line. wth?

(edit: I spy gil losi jr, there at the end! )
With it being that grippy there was some incidents throughout the race that could have been viewed that way but it was alot of wheel to wheel racing. The incident right before the line was ....... fill in the blank. I remember Cav doing that same kind of thing to tebo (maybe it was the other way around) a couple years ago at cactus but they didnt wreck and it worked to get past him.
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Old 03-17-2013, 01:11 PM   #5698
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Yeah, maybe there was just some bad luck throw in there... sure looked like some robust driving to me
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Old 03-17-2013, 01:41 PM   #5699
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Originally Posted by Cpt.America View Post
Uhm.. Tebo and the 6 looked amazing. But am I the only one that thinks there was some dirty driving in that race by the other guys in the front? Cav took one in the kiester, with no lube, 4 feet before the finish line. wth?

(edit: I spy gil losi jr, there at the end! )
Was that Mayfield that cleared out his own teammate at the line? Couldn't really see what happened very well on the small computer screen.
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Old 03-17-2013, 01:50 PM   #5700
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And tebo takes the overall win!
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