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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 12-01-2015, 03:43 AM   #12811
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What about where the transmission mounts to the bulkhead?
If you remove all the shims you'd have a gap in there.
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Old 12-01-2015, 05:58 AM   #12812
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Quote:
Originally Posted by K_King View Post
The wheelbase section is for both hubs and arms. Follow the lines to either or. It's a bit confusing. I shim my arms forward 2mm and run hubs in the middle.

Anti-Squat is done on the rear pivot because of the angle. The pin is higher on the F holder so you couldn't go lower there unless you made your own pills or holder.

Basically imagine the front pivot is locked and you are moving the rear up to level the pin out. The straighter the hingepin the less Anti Squat you have so you get more sidebite and an overall softer rear end.

I either run .5 on the bottom and .5 on the top or 0 on the bottom and 1mm on the top. I've tried 0 on the bottom and the rear gets really soft and doesn't work like I want it to.

Technically only the bottom shim affects anti squat. The one between the pivot and the rear bulkhead is a bit confusing. You don't really need one there and I was talking to another driver last night about the lack of info on it. I've always assumed that all of the shimming there had to equal 1mm to keep the tower in the same spot. However one could also assume that shim is just like the front pivot shim where it's used to change roll center as well. The thing that bugs me is that moving the entire tower up changes a lot of stuff like shock angle, droop, roll center and CG. I would assume having no shim would be the most aggressive since it's like lowering the ballstud but nobody has ever talked about it.
If you ever decide you don't want to run the shim between the bulkhead and the pivot, make sure you put some shims under the transmission mount (where it mounts to the bulkhead) or it will bind up. For example, if you run no shim on the bottom, and no shim on the top, then under the transmission mount you would add 1mm.
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Old 12-01-2015, 09:06 PM   #12813
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For anyone using the JTP rear shock tower-

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Old 12-02-2015, 03:17 AM   #12814
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i dont have any gap issues...um lol
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Old 12-02-2015, 03:28 AM   #12815
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Quote:
Originally Posted by Jason.Dias View Post
For anyone using the JTP rear shock tower-

Isn't that wrong on the anti-squat shims?? It's bass akwards.
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Old 12-02-2015, 06:23 AM   #12816
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What is needed to convert a rb6 to the 2015 rb6?
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Old 12-02-2015, 03:24 PM   #12817
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What do you guys hear for a 13.5? 28/76?
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Old 12-03-2015, 12:48 AM   #12818
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Quote:
Originally Posted by eper View Post
i dont have any gap issues...um lol
Are you referring to my post about running no shims?

If so take your pinion off and check if you transmission spins freely.
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Old 12-03-2015, 02:37 AM   #12819
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Quote:
Originally Posted by oPAULo View Post
Isn't that wrong on the anti-squat shims?? It's bass akwards.
We don't know what degree Jared is referring to in his image, he could be talking about the degree of change (delta) from what he has learned, but let me try and clear up any confusion.

From what I understand (based on my own measurements, so I could be wrong) no shims under the rear sus block equals 2* of anti-squat, which is the most anti-squat you can get without adding shims under the front sus mount.

As you add shims under the rear sus block, you're taking away anti-squat (leveling out the arms). Each shim (0.5mm) equals roughly 0.75*, so 1mm equals 1.5*.

That means thick (1mm) shim under the rear sus block would bring the total anti-squat to 0.5*, and the thin (0.5mm) shim would bring the total to 1.25* of anti-squat.
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Last edited by Jason.Dias; 12-03-2015 at 02:52 AM.
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Old 12-03-2015, 03:30 AM   #12820
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my tranny is very free. i understand what u are saying 100% with shimming it to not twist or force anything in a certain direction. i measured the tranny rear mount height and my rear tower bulkhead height and this is what works in the back of my car. maybe it has to do with there allowable tolerances i dontknow
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Old 12-03-2015, 05:22 AM   #12821
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Quote:
Originally Posted by eper View Post
my tranny is very free. i understand what u are saying 100% with shimming it to not twist or force anything in a certain direction. i measured the tranny rear mount height and my rear tower bulkhead height and this is what works in the back of my car. maybe it has to do with there allowable tolerances i dontknow
Hmm, I am not sure how it would be free, unless it's not tightened all the way? I am a stock racer, so our definitions of "Free" could be a little different, for example with the pinion removed from the motor, no tires, a Schelle spur with slipper eliminator, and ceramic bearings, mine will spin for 46 seconds with a decent flick. It's so free it would actually rock back n forth with the wheels on if they're out of balance.

If I were to run 0 shims (which I did for a long period of time when the RB6 was first released) my transmission was completely bound up until I added shims between the transmission mount and the bulkhead, they're difficult to slide in place, but I highly recommend you add them, if anything for the peace of mind that it's all solid, and secure.

But if it works they way you got it, then no sense in changing anything
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Old 12-03-2015, 06:27 AM   #12822
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Are you all referring to part #s UM508C & UM726
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Old 12-03-2015, 07:47 AM   #12823
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Currently I am running a thin shim under the rear suspension block and thin shim under the bulk head. In theory this should leave me at 1.25 degrees of anti squat. I am using Tebo's front and rear shock towers. would like to hear about running 0.5 degree and 2.0 degree anti squat and what that specifically does (handling wise).

Since I have a total of 1mm shim, I don't believe I need to add anything under the trans mount to the bulkhead. Is that correct??

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Old 12-03-2015, 08:25 AM   #12824
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Quote:
Originally Posted by Jason.Dias View Post
my transmission was completely bound up until I added shims between the transmission mount and the bulkhead, they're difficult to slide in place, but I highly recommend you add them, if anything for the peace of mind that it's all solid, and secure.
Can't get a picture of where to do this sir. Can you point me in the right places So that I can understand thank you sir


I got it that little lip in the back that goes under the shock tower. Got it.
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Old 12-03-2015, 05:30 PM   #12825
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46seconds holy crap mines not that fre but its as free as when its nt in trhe car and everything is tight sir
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