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Old 07-22-2016, 06:15 AM   -   Wikipost
R/C Tech Forums Thread Wiki: Kyosho Ultima RZ6
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Shameless Plug Kyosho RZ-6, the 2015 IFMAR World’s Top Qualifying Car Model.
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Find out how Jason Dias lost some weight on his RZ6. Click here.
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Editable setup sheets.
Sheet 1
Sheet 2
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Shock building, alternative method.

Fill the oil up to the first thread.
Extend the shock shaft so the eyelet bottomed out on the shock bottom.
Place the piston into the shock body but let gravity pull it down into the body.
Once the shock bottom reaches the shock body help align it into the body so that the treads line up.
Turn the shock bottom so that it starts to thread into the body.
Wait for 1 second to give the excess oil time to escape.
Continue to turn, wait, turn, wait process until the shock bottom is tight.
Pump the shock shaft a few times and then bottom out the eyelet to the bottom of the shock and release.
Hopefully you should not have any rebound or maybe just a little bit.
If you have more than you like, loosen the shock bottom, push the shock shaft down, wait for a little bit and then re-tighten the shock bottom.
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Jared Tebo shock building video.
+ YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.

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2-15 IFMAR Worlds, A-main #1. Jared Tebo TQ using the RZ6.
+ YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.

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Old 06-22-2016, 06:31 AM   #31
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For the transmission noise, I found that I had to set the gear mesh between the bevel gear and the diff gear. Once I tightened down the case it that mesh seemed to get tighter. You could also try some lightweight gear lubricant, such as this or this. I personally have never used either of these but from what I have heard they are pretty good.
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Old 06-22-2016, 08:39 AM   #32
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So yesterday was another adventure to the track with the RZ6. After my last visit I felt really comfortable in how the car handled. Unfortunately for me, I had burned up my set of tires I was using so I had to bolt on some chainlinks on the front and rear. With these tires the car seemed to lose some forward bite, which I am going to blame on the inserts and tire being somewhat new. The front didn’t want to steer right either but whenever I put on chainlinks on in the front the car would not turn until the closed cell inserts were like open cell or close to it.

Anyway, after watching my son struggle with his possessed RB6 I swapped rides with him for the night and while I tried to figure out his car he would drive the RZ6. I made one change and that was moving the rear hubs forward and that seemed to provide the grip that I was missing. It took about 3 more runs before the inserts started to come in. In the third round the car was hooked up. He said it was very easy to drive and he was able to put in his best run ever on the current layout. The main was the same thing. Now he just needs to work on not making mistakes. Unfortunately for me, I probably won’t get the car back now to try a mod motor in it but maybe I should give it to him to try. I should probably check the wallet before I do that.

End result, moving the rear hubs forward helped make the car feel like it had more grip. IMO, the car has the capability to run with the dirt cars on their turf in a 17.5 class. Hopefully I can say the same thing when I try mod.
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Old 06-23-2016, 06:21 AM   #33
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I am sorry I forgot to mention that I did bring the front shocks in on the tower one hole to help the car turn because of my tire situation.
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Old 06-23-2016, 08:20 AM   #34
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Thanks Kraig, great reading.
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Old 06-23-2016, 10:50 PM   #35
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Hey guys,

The only parts missing to complete this buggy is: rb6 front end, 4 shocks, front & rear arms, driveshafts, rear hubs, and camber links with ball studs? I have an rb5 with big bore shocks so I guess I can use those. Please help. Thank you.
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Old 06-24-2016, 07:56 AM   #36
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Yes, you can use shocks, rear arms, driveshafts and rear hubs, camber links and ball studs from the RB5. You will still need the front end and steering from a RB6 though (or go experimental and use the RB5 arms, hubs, front bulkhead...)
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Old 06-25-2016, 12:44 AM   #37
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I need to gain more off power steering TBH. Raced on carpet last night and made a good few changes, the most prominent was a 1mm shim under the steering ball stud.
Im currently running the rack arrow forward, hubs up, so i have the .5 and 1mm shim on top of the C hub, yellow front springs, on 500 shock oil.
Car felt better, but i may try a 1mm shim on the ackerman rack, see if i can gain a bit more off power in the tighter low speed corners, opinions on low speed steering gain?

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Old 06-25-2016, 12:46 AM   #38
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Quote:
Originally Posted by Kraig View Post
For the transmission noise, I found that I had to set the gear mesh between the bevel gear and the diff gear. Once I tightened down the case it that mesh seemed to get tighter. You could also try some lightweight gear lubricant, such as this or this. I personally have never used either of these but from what I have heard they are pretty good.
Drop a .2 shim between the rear bearing on the slipper assembly, did quieten mine down as there is some slop there, more so after a few runs.

lee
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Old 06-26-2016, 06:52 PM   #39
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Quote:
Originally Posted by Kraig View Post
I had 5k in my diff and that didn't work out so well. I will get some 2k and give it a try in the future.

I moved the shocks, because it was easier to do at the track. Maybe my next step will be to move the speed control behind the motor like you suggested but I need to get the front to feel like I want it to feel.
How did you move the shock?
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Old 06-26-2016, 07:04 PM   #40
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I flipped the screw around, added washers to it and then put the top of the shock on. I think I ended up with 1 maybe 2mm additional shims on the top bolt. Does that make sense?
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Old 07-13-2016, 02:22 PM   #41
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Here is a great article on how Jason Dias was able to shed some extra weight off of his RZ6.
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Last edited by Kraig; 07-13-2016 at 04:22 PM.
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Old 07-13-2016, 10:47 PM   #42
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Quote:
Originally Posted by Kraig View Post
Here is a great article on how Jason Dias was able to shed some extra weight off of his RZ6.
Great info, thanks. Still building

Now I really want to build a 17.5 RZ6...
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Old 07-16-2016, 06:58 AM   #43
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Is the carbon fiber battery strap I'm seeing on some RZ6s from a ZX6?

Thanks!

I'm running my RZ6 on dirt for the first time today!
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Old 07-16-2016, 10:23 AM   #44
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Is the carbon fiber battery strap I'm seeing on some RZ6s from a ZX6?

Thanks!

I'm running my RZ6 on dirt for the first time today!
Correct on the battery strap!

Good luck!
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Old 07-16-2016, 05:42 PM   #45
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Quote:
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Correct on the battery strap!

Good luck!
So far I'm qualified 3rd, 8 seconds off TQ against all 22 3.0s and B5Ms
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