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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 12-30-2013, 03:15 AM
  #9181  
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Originally Posted by K_King
Ok fellers here's what I have been running since the chassis addition. I ran it this last Saturday and was able to run my personal bests in Round 1, then beating that by 4 seconds in Round 2. In the main I ran my fastest lap and had a lap on everyone, with some good competition. The new chassis makes the car easier to drive for sure in my opinion. I run on an indoor track that isn't really clay, its mainly hard packed dirt. Needless to say it can get dusty and loose at times so traction is up and down.

I put the new chassis on, went back to a setup I had run before, and did some battery adjustments that the new chassis allows you to do. My car weighs 1545g, and on the old chassis it was around 1580g. Pretty nice difference and it flexes more!

https://dl.dropboxusercontent.com/u/...Dec%202013.pdf
I am guessing the 3.5 rear toe helps?
I run 3.5 in my rear mount out our track where it can dust up and it is far better than 3.0 without taking any steering away.

What’s the difference between UM128 and 97050M ball stud on the rear block?
Now I finally have my MM RB6 back together again after the $150 worth of parts crash I can do a back to back of my RM and MM at our club track and see what I like.

I have been paying close attention to the MM talk for medium bite tracks
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Old 12-30-2013, 09:00 AM
  #9182  
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Originally Posted by K_King
Ok fellers here's what I have been running since the chassis addition. I ran it this last Saturday and was able to run my personal bests in Round 1, then beating that by 4 seconds in Round 2. In the main I ran my fastest lap and had a lap on everyone, with some good competition. The new chassis makes the car easier to drive for sure in my opinion. I run on an indoor track that isn't really clay, its mainly hard packed dirt. Needless to say it can get dusty and loose at times so traction is up and down.

I put the new chassis on, went back to a setup I had run before, and did some battery adjustments that the new chassis allows you to do. My car weighs 1545g, and on the old chassis it was around 1580g. Pretty nice difference and it flexes more!

https://dl.dropboxusercontent.com/u/...Dec%202013.pdf

Thanks for the update on the new gear. Curious why, if the chassis flexes more, you have all three side-pod screws secured. Doesn't that effectively cancel the new found flex you've gained? Still trying to decide if the new chassis is in my future.
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Old 12-30-2013, 09:18 AM
  #9183  
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You can have too much flex. Most of the milling is in the rear end so, in my opinion, making the torsional flex less will make the area that has more flex, work more. That may or not be correct on how it works but that's how I'm treating it until someone tells me I'm wrong, which I'm ok with!

I have a buddy with a Tamiya who says their chassis have so much torsional flex it creates a snap effect to the car. It would essentially flex to a point and snap back really fast. He made CF braces and it fixed it. I'm not really lacking side bite either.

If anything I can take them out to get even more grip out of it but right now it's pretty good.
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Old 12-30-2013, 09:27 AM
  #9184  
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here is my new ride. the quickie paint job turned out ok. i dremmeled the side pod just a bit for the reciever. i have an r10pro in my wheeler but just like the feel of the flow better so i kept it in my 2w (blasphemy i know)
Attached Thumbnails Kyosho Ultima RB6 & RB6.6 Car Thread-image_2.jpg   Kyosho Ultima RB6 & RB6.6 Car Thread-image.jpg   Kyosho Ultima RB6 & RB6.6 Car Thread-image_1.jpg  
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Old 12-30-2013, 10:27 AM
  #9185  
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Very nice ^^^

Do you guys use weights on front for mid motor ?

I'm going to switch out my wire layout and put my battery as far as I can on my MM. . I have a low pro servo on it and a standard one that weighs just a bit more and I was thinking if it's good to add a bit weight on front when using a low profile servo..
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Old 12-30-2013, 05:58 PM
  #9186  
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Hi all, I have had my rb6 for about 1 month and have driven it twice, in the two times I took it to practice, I have bent the front suspension plate, has anyone got the same problem?, can it be fixed or do I just buy a new one every time I cartwheel my car after a jump?
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Old 12-30-2013, 06:37 PM
  #9187  
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Originally Posted by skhadka17
Hi all, I have had my rb6 for about 1 month and have driven it twice, in the two times I took it to practice, I have bent the front suspension plate, has anyone got the same problem?, can it be fixed or do I just buy a new one every time I cartwheel my car after a jump?
Kyosho makes a beefier front plate

http://www.amainhobbies.com/product_...n-Plate-Type-B

And btw, don't cartwheel lol
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Old 12-30-2013, 08:48 PM
  #9188  
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Yeah, that's the front plate which I've been buying, I think it also comes stock cause that was the same part number in the manual, I tried bending them back but it's very difficult, has anyone tried reinforcing them or has an idea as to how to?
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Old 12-30-2013, 09:54 PM
  #9189  
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Well, I drove the car and it was awesome, as always. Chassis flex screws out was better. More traction for sure. Went to the 27* caster setting thanks to a tip from Matesa. Faster steering in the infield was good.
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Old 12-30-2013, 10:02 PM
  #9190  
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I was able to get a new phantom body painted up. I really like this body as it fits perfectly and has a very unique look with or without the fin.
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Old 12-30-2013, 10:03 PM
  #9191  
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Double
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Old 12-31-2013, 01:48 AM
  #9192  
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Originally Posted by skhadka17
Yeah, that's the front plate which I've been buying, I think it also comes stock cause that was the same part number in the manual, I tried bending them back but it's very difficult, has anyone tried reinforcing them or has an idea as to how to?
You may have a broken front suspension mount block (UM721) or inner hinge pin(UMW101) which could be causing the brace to bend due to the additional flex allowed.

If you really want to avoid bending that piece, slap an aluminum suspension block on it. GHEA makes one. But keep in mind that thing is bending for a reason, and it's preventing things like your arm or bulkhead from snapping.
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Old 12-31-2013, 02:10 AM
  #9193  
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Originally Posted by B00t13g
I was able to get a new phantom body painted up. I really like this body as it fits perfectly and has a very unique look with or without the fin.
Did you take it out for a spin??
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Old 12-31-2013, 04:15 AM
  #9194  
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Originally Posted by Jason.Dias
You may have a broken front suspension mount block (UM721) or inner hinge pin(UMW101) which could be causing the brace to bend due to the additional flex allowed.

If you really want to avoid bending that piece, slap an aluminum suspension block on it. GHEA makes one. But keep in mind that thing is bending for a reason, and it's preventing things like your arm or bulkhead from snapping.
Ouch, $45 for a little piece of aluminum.
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Old 12-31-2013, 07:03 AM
  #9195  
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Originally Posted by nickdawg18
Ouch, $45 for a little piece of aluminum.
Yaiba makes one as well
http://www.yaiba-racing.com/products/YRG084_eng.html
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