OTA R31/B

Post your full Counter-Steer setup specs here.
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Davis
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OTA R31/B

Postby Davis » Fri Feb 22, 2013 10:04 am

I build up a second OTA on the basis of an Eagle Racing Conversion for the R31. That way I don´t have to change the setup from serious CS to a competition setup all the time.

This time I went for the full stealth look, by blackening all alu parts with a special agent from the gunstore. Real gun metal, in that regard. :up:

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For now I will test the next gen RC Art suspension with the chassis in more detail. Rolling front suspension and stiff rear camber. - We´ll see how that works out?

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Got Flex? ^^

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Tomorrow I will have a setup and trouble shooting session. After that, I will know a bit more about the performance of the chassis. 8-)

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EDIT 24.02.13

Setup & Specs:

Manufacturer: Various
Model: OTA - R31
Track Surface: Carpet
Tires: RC Art Carpet Tires
Motor and ESC: Novak SLYDR1 / Novak Ballistic 10.5t
Servo: BBird 955-dmg

Front Setup
Camber: 7°
Toe:+1°
Caster angle: 10°
Kick-up: 0
Ride Height: 7mm
Springs: SJ Soft Select Supersoft (Red)
Damper Oil : #100
Upper Damper Position: TA05 Rockeram
Lower Damper Position: Outer Hole
Other: Front Roll Mod withTA05 IFS Parts

Rear Setup
Camber:5°
Toe: -0.5°
Kick-up: 0
Ride Height: 8mm
Springs: SJ Soft Select Medium (Yellow)
Damper Oil: #100
Upper Damper Position: 3 Holes in
Lower Damper Position: Inner Hole
Other: Swing Axle from TA06 Front Damper Stay, Slow rebound dampers, custom flex chassis plate

Drivetrain
Front Pulley: 39
Front Center: 17
Middle Center: 21
Middle Rear: 15
Rear Center Pulley: 19
Rear Pulley: 36

CS Rate: 1.7

Gearing
Spur: 116T
Pinion:36T
Last edited by Davis on Sun Feb 24, 2013 5:20 am, edited 1 time in total.

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Re: OTA R31/B

Postby ridinvintage » Fri Feb 22, 2013 10:21 am

Very interesting setup, I have the active camber on my TA05 GRT but in the rear, may look into stealing the idea for the front.

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Re: OTA R31/B

Postby marshun » Fri Feb 22, 2013 3:50 pm

good looking set up. im interested in knowing how those cuts worked out for you. my drift package set up is no top plate or steering post brace. works good for cs.

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Re: OTA R31/B

Postby Davis » Sun Feb 24, 2013 5:39 am

Setup added in the first post.

The chassis ran very well on our local carpet track with the mods yesterday. - The extra traction helped to bring the chassis easily door to door. There was also enough speed to catch up with the train after a mistake. - As a leader it was also very easy to drift it slow to keep the twins close.

We have an elevated part of the track there and the variable camber of the rear swing axle worked without a problme on the ramps. I still have to see how that will work out on hard surfaces with a lot of tire wear though.

I am not really sure, how much influence the chassis flex or the modified suspension had exactly, but I will put the suspension mods on the other OTA as well, after that I can tell more about how successful cutting the chassis plate for more flex really is. ;)

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Re: OTA R31/B

Postby Fitto » Mon Feb 25, 2013 3:45 am

Hi!
love your "black style" r31 ;)

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Re: OTA R31/B

Postby Calzone » Wed Mar 27, 2013 1:22 pm

So, have you tried this at the D1:10 already? Or have you atleast tried this on a hard surface? I'm curious about this!

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Re: OTA R31/B

Postby Davis » Wed Mar 27, 2013 1:37 pm

I ran it all weekend at the 2nd D1:10 round in Amsterdam. - The chassis works great. 4th in qualifying. :up:

I am not really sure if the mods are necessary though. The OTA with normal suspension ran as good as this one with the right springs. But at least the mods don´t make it worse. ^^ ... On our local carpet track the rolling front and swinging rear gave a bit more speed to the chassis though, so I could catch up easier for train drifting.

Still testing. ;)

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Re: OTA R31/B

Postby Calzone » Fri Mar 29, 2013 8:39 am

hmm, interesting.. I might give it a try sometime :) What about the cut in lower deck? A lot more grip?

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Re: OTA R31/B

Postby femur » Mon May 06, 2013 6:01 pm

Nice chassis! I like the all black everything. I'm currently in the setup process with my own ota r31, for carpet, with high ratio. I'll be aiming for about 3.5cs, going well so far.

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Re: OTA R31/B

Postby dencio1976 » Fri May 17, 2013 6:38 am

when you lift the chassis, wont the rear dogbones dislodge from the outdrives?

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Re: OTA R31/B

Postby Davis » Fri May 17, 2013 7:57 am

No, only if you remove the damper. Since the shock can´t extend that far the cvds stay in place.

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Re: OTA R31/B

Postby Davis » Thu Jul 04, 2013 12:23 pm

Some Updates. - I changed to a lateral battery position for now. I noticed in some videos, that my old EagleRacing TA05 actually made a very nice impression in turns and switchbacks. - Gonna give that layout a try in the OTA for that reason - :up:

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For the steering I upgraded to 10° Yokomo lower caster hubs and steering knuckles. - That should make it easier to achieve parallel and faster steering, than with the original geometry. - Will give the chassis an extensive spin this weekend. :lol:

Image

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Re: OTA R31/B

Postby valve_timing » Sun Aug 18, 2013 2:24 pm

What cvd are you using ?

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Re: OTA R31/B

Postby Davis » Sun Aug 18, 2013 2:39 pm

I should update this as well. - The Yokomo lower caster hubs and knuckles gave a lot of play and vibration as well. I wouldn´t recommend those.

I now converted to 10° TA-05 C-hubs and Yokomo DRB Knuckles (the normal ones) - I am using TN-Racing CVDs with those and steering is smooth till full lock.

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Re: OTA R31/B

Postby valve_timing » Sun Aug 18, 2013 3:00 pm

I have a eagle r31 fm I have eagle racing cvds 55* but at full lock I hit the shocks I'm running 13* caster blocks

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Re: OTA R31/B

Postby Davis » Mon Aug 19, 2013 10:50 am

I drilled a new hole into the suspension arms to get the dampers further in and make more steering possible with the stock pasts. - But even then I needed an offset of 8mm minimum with the original steering to keep clear of the dampers. - Right now it also works with 4mm offset fine, since the front is a bit wider due to the TA05 suspension arms.

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Re: OTA R31/B

Postby valve_timing » Tue Aug 20, 2013 3:19 pm

Post a picture if you can I was planning on going back to plastic arms on my r31 anyway I would love to get more angle out of my chassis

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Re: OTA R31/B

Postby Davis » Sun Sep 22, 2013 9:09 am

And on we go. RWD! :D

With a few modifications the chassis runs already pretty smooth, almost too easy. ^^

Backpack battery, Bagi suspension, rollmod front, modified steering and 90g of additional weight on top of the front axle, that´s pretty much it.
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There´s still a lot to try and test though. Setup soon ...

And a video of todays test session. ;)

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Re: OTA R31/B

Postby Stalwart » Mon Sep 23, 2013 7:21 am

No gyro?

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Re: OTA R31/B

Postby Davis » Mon Sep 23, 2013 9:47 am

Yes, I am using a KDS800 gyro, set to about 60% gain. - This setup is also more or less drivable without the gyro support. But it´s way more fun with it. :D

My current setup 26. September 2013

Chassis: OTA R31 RWD
Motor & ESC: Novak Ballistic 10.5T / Novak SLYDR
Gyro: KDS 800
Servo: Savöx 1251
Battery: EA LiFe weight: 215g

Modified Parts:
* Eagle racing TA05 Steering block extensions
* Wrap Up Y arms
*Yokomo DP Type C upper arms
*DIB lower caster knuckles
*"backpack battery"

Gearing:
Spur: 116t
Pinion: 32t
Pulleys (front to rear): 21,16,15,40t

Weight:
front diff: 110g
front bumper: 45g
rear: 40g

total chassis weight (ready to run): 1616g
approx. weight distribution front/rear: 54%/46%

SFront Shock Oil: #400
Front Springs: StreetJam Soft Select Blue (hardest)
Shock Position top: most outer hole
Shock Position bottom: most inner hole
Droop: 12mm

Rear Shock Oil: #50
Rear Springs: StreetJam Hard Select Red (softest)
Shock Position Top: Middle Hole
Shock Position Bottom: Most outer hole
Droop: 7mm

Caster Angle: 12°

Front Camber: 4°
Front Toe: 1° toe out
Ride height front: 7mm

Rear Camber: 2°
Rear Toe: 0°
Ride height rear: 10mm

Electronics Setup:
ESC:
Throttle expo curve: on
Dragbrake: 0%
brake strength: 100%
Boost / Timing: off

Transmitter:
Steering Expo: +20%
Thottle Expo: +10%
Brake Expo: -60%
Gyro Gain: 60%

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Re: OTA R31/B

Postby Davis » Wed Oct 02, 2013 8:29 am

Update.
The steering is now modified with MST knuckles. Thanks to the rotation point, that sits quite far outside the wheels don´t rub on the steering assembly anymore at full lock.

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A picture of the whole chassis as it is today. No fancy suspension mods for now. ^^
I added quite some weight to the chassis. It is about 1700g right now. With the center of gravity pretty much in the middle between the wheels.

Image

And a short video of todays test session. With the current setup the chassis also handles quite ok without the gyro. - It´s more fun with though. :D


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Re: OTA R31/B

Postby eydy » Thu Nov 28, 2013 12:33 pm

Yeah! very good project!
Sorry what suspensions mount do you use for your front steering mod?
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Re: OTA R31/B

Postby Davis » Fri Nov 29, 2013 3:09 am

The suspension mounts are the stock Streetjam plastic parts. I had to drill the holes a bit more inwards to make them fit, but that was an easy match.

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Re: OTA R31/B

Postby eydy » Fri Nov 29, 2013 10:20 am

Davis wrote:The suspension mounts are the stock Streetjam plastic parts. I had to drill the holes a bit more inwards to make them fit, but that was an easy match.

Thank you Bro!
That's what I thought but I doubt because you really well reperser the holes: that's not seen!
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Re: OTA R31/B

Postby Davis » Mon Dec 30, 2013 3:47 pm

The latest setup:

*** Tire choice and Suspension settings depend a lot on track and the speed of the other drivers. ***

Track: RC Drift Force Hall / Carpet / 28.12.2013

Chassis: Streetjam OTA R31 / ER Conversion
Mods: Backpack Battery / WUP Y Arms / MST Steering Knuckles

Servo: Savöx 1251
ESC: Novak SLYDR
Motor: Novak Ballistic 10.5t
Gyro: KDS 800 (60%)

Total weight (Ready to Rock): 1662g
Additional Weights: 110g Front / 10g Rear CHubs / 40g Middle(Servo balance)
Weightdistribution (weight & ride height) : Front 49% / Rear 51%

Front:
Caster: 13°
Camber: 5,5°
Oil: #400
Springs: YeahRacing Medium (Yellow)
Damper Position: bottom inner hole / 10° angled in
Toe: 3° Toe Out
Steering Lock (limited): Ackermann 70°/80°
Ride Height: 10mm
Droop: 10mm
Tires: ER Constant Grip

Rear:
Toe: 0°
Antisquat: 2mm
Camber: 1°
Oil: #400
Springs: SJ Hard Select Hard (Blue)
Damper Position: bottom inner hole / 20° angled in
Ride Height: 13mm
Droop: 2mm
Tires: R2 T-Drifts (Profil)
Drivetrain: Balldiff open (drives very similar to the solid axle but a bit more neutral)


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