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R/C Tech Forums Thread Wiki: Xray XB2 2WD Buggy Thread
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Last edit by: dgrobe2112
Instruction manuals: (C/O BentKa)

Xray XB2 Carpet Edition Instruction Manual
http://www.teamxray.com/xb2/2016/dow...ual_v2_low.pdf

Xray XB2 Dirt Edition Instruction Manual
http://www.teamxray.com/xb2/2016/dow...w.pdf?update=2

BentKa: Carpet Edition 4 gear to 3 gear laydown conversion parts:
  • Gearbox #323014
  • Motorplate #324012
  • 36T idler gear #324236
  • Brace for waterfall #324031


Socket: Bodies Available:

Xray has two OEM bodies, the .75mm and the .50mm light weight:
light weight: https://www.amainhobbies.com/xray-xb...329701/p492942

OEM .75mm: https://www.amainhobbies.com/xray-0....329700/p477762

Also, I've fitted the yz2 body, both the light and regular fit fine, just make your own cut lines:
https://www.amainhobbies.com/yokomo-...z2-101/p417674


[i] J Concepts S2 Body [i]


Penguin Racing makes a high grip body that fits the DE and CE:
http://www.ebay.com/itm/X-Ray-Xb2-Hi...oAAOSw1S9WewHV



Socket: Wheel fitment:

According to some, you'll require different offset rear hexes to use B5M wheels. According to my Hudy setup board, B5M wheels are the same offset. I measured the overall width of the car with XB2 wheels, and then again with B5M wheels, same measurement.

On the front, B5M wheels were 1.5mm wider. Xray offers hexes to reduce width -.75 on each side, or you could spend 3-5 minutes and sand your OEM hexes down .75mm.

edit by dgrobe2112
here are the hubs for losi and AE

for AE Front 365354 -0.75
for Losi rear 365358 +3.00 (4 stripe)
for AE rear 365359 +3.75 (5 stripe)



Socket: Flex and the XB2:

Flex screws are as follows:

Plastic bulkhead between motor and waterfall. Can remove screw in chassis, or remove bulkhead altogether.

Waterfall has 4 screws, can remove the inner two or outer two. IIRC, removing the inner two provides more flex, and thus more bite.

Removing the battery brace. This gives a tremendous amount of flex on the middle of the car, and can sometimes be inconsistent. I do this for outdoor racing on low bite. I like the feel over the 4 gear in 17.5 racing, since the 4 gear will take some snap away off the corner.

Rear C block - has inner and outer screws. I haven't played with this, as it's a crucial pivot point of the car.

Medium arms and towers -> I don't believe the carpet car has the rear medium tower available, however the DE DOES have an optional hard part. I think the hard parts are more consistent, especially when it gets hot (90+ degrees F). However, the medium parts do NOT break unless you're severely talented. They also don't wear out.



Socket: Avid/Schelle Slipper mod:

Credit to WillS, Matt Trimmings, and myself for figuring this out months ago.

Parts you'll need:

B5M V2 3gear compatible top shaft.
TKO Special 5x13x5 bear OR 5x13x6 bearing Either can work. This replaces the spur side bearing on the top shaft.
5mm shims, same shims used in 1/8th scale clutch bells. Look for protek .1mm and .2mm kit.
Avid or Schelle b5m top shaft kit, with spur gears of your choosing. (DE can't handle a 69, the CE can)

Shimming: You'll need to install the bearing in the front portion of the removable piece for the shaft. Make sure the bearing is pushed all the way in. With the TKO bearing, you'll need to shim approximately 1.4mm on the front side of the top shaft. Roughly .3-.5mm with the other bearing. This is a "feel" and tolerance setting. I urge you to watch videos about setting clutch bell play in 1/8th scale to get an idea of what yield you want for end play. Too tight, it'll eat bearings.

Outside of trans case: Use Avid/Schelle top shaft spacer plus .2mm shim to offset slipper from motor plate perfectly. Install slipper as instructed, and use Avid/Schelle spring and XB2 slipper nut.

- NEW - Schelle now sells Xb2 Topshafts. They include a spacer, so no need for shims in gearbox, and comes with the smaller bearing. Both methods work.

Socket: Yokomo Differential or MIP pucks:

Credit to: WillS for figuring out pucks, and as well fitting the Losi 22 diff with the same mods.

Parts needed: Yokomo Bmax2 or YZ2 complete diff OR Mip PUCKS outdrives
Xb2 diff gear
Bmax2 V3 Worlds rear dog bones, or Bmax 2 pucks dog bones
You'll use XB2 axles, and will require no other mods for the axles or dog bones.
You'll need .2mm outdrive/diff shims. Shim approximately .5mm on each side of the diff, behind the bearings. The top portion of the transmission is what "sets" the diff in place, not the bottom half. A little play back and forth is fine, the stock diff has some play from the factory.

dgrobe2112: CE to DE conversion:
along with the parts needed.. you MUST have these following hardware, or it wont work

https://www.teamxray.com/xb2/2016/do...conversion.pdf

(3) XRAY 902340 M3x40 button head screws. these are the screws that mount the motor mount to the tranny
(4) XRAY 903322 M3x22 counter sunk screws. these are for the rear diff case, to mount to the chassis. i think i used some M3x18 and they worked ok.

Socket: Best method for setting up the XB2 ball diff:

The XB2 diff is stellar when setup correctly. The spring is too short and soft, allowing the diff to slip. You'll need to glue the rings to the outdrives with just a drop of CA, then add a 1mm shim between the spring and the outdrive. This preloads the spring and stops the diff from slipping so easily.

OR, you can run the AE diff spring, which is both slightly longer, and stiffer. The overwhelming issue is the stock spring allows the nut to bottom out on the outdrive before the diff is tight enough.

This shim:
https://www.amainhobbies.com/xray-al...a303122/p12070

This diff spring (don't need a shim, then.)

https://www.teamassociated.com/parts...thrust_spring/

Functional Aftermarket parts: (Not just bling!)

Servo Horn: (The B5M sized horns are too short to get full throw)
https://www.amainhobbies.com/protek-...800-bk/p273496


Socket: Exotek has a full suite of parts, some bling, some not. Here's a list (all fit DE and CE, unless otherwise noted):

Titanium front axles: http://www.exotekracing.com/xb2-titanium-front-axles-2/

Rear Hanger, HD (Adds 4 grams): http://www.exotekracing.com/xb2-rear...75-heavy-duty/

Brass C block, 18 grams added: http://www.exotekracing.com/xb2-rear...-brass-weight/

Alloy front camber mount: http://www.exotekracing.com/xb2-fron...er-mount-7075/

Carbon Fiber Chassis: http://www.exotekracing.com/xb2-carb...m-plate-2-5mm/

Alloy rear hubs:http://www.exotekracing.com/xb2-allo...ub-set-2-7075/

Alloy servo mounts, allow for use of LP servo:http://www.exotekracing.com/xb2-xb4-...-alloy-1-pair/

Titanium shock mounts: http://www.exotekracing.com/xb2-xb4-...shock-posts-2/

Slipper Eliminator: http://www.exotekracing.com/xb2-direct-spur-mount/
Xray eliminator is #324100

dgrobe2112: 2016-2017 new 3 gear laydown
Gearbox #323014
Motor plate #324012
36T idler gear #324236
Brace for waterfall #324031

dgrobe2112: Xray Spring Rate Conversion:
front C WHT
368174 2 str 0.65-0.85 3.71-4.85

358184 2 dot 0.65 3.71
368185 3 dot 0.72 4.11
368186 4 dot 0.80 4.57


Rear
368273 2 str 0.35-0.45 2.00-2.57

368284 1 Dot 0.35 2.00
368285 2 Dot 0.40 2.28
368286 3 Dot 0.45 2.57
368287 4 Dot 0.50 2.86

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Old 11-27-2015, 01:50 AM   #226
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Quote:
XB2 Dirt Edition rapid prototype.

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Old 11-27-2015, 02:42 AM   #227
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Just got mine today :-)

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Old 11-27-2015, 03:32 AM   #228
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Looks like great component quality as usual, very appealing on that basis alone. Why no 3 gear laydown transmission option though? I'm not aware of any full size motorsport where chassis / suspension arm flex is considered a good thing. If compliance is necessary it is usually introduced via directional rate controlled bushings in between rigid sections. For such an engineering led company the whole flex thing seems a little flaky..IMO anyway.
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Old 11-27-2015, 03:52 AM   #229
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Quote:
Originally Posted by BentKa View Post
I plan to post it on her page during the day today

We ran 2x1.6 and 2x1.7 pistons (drilled stock pistons), graphite arms, under LiPo weight from Xray, brass bulkhead, alu. rear camber link mount.
Rest of the parts where stock Carpet Edition parts

Bent

Where can this setup sheet be found?
Thanks for all the info Bent!

Hope to see you and Malin at a race soon..


Best Regards
Morgan
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Old 11-27-2015, 06:37 AM   #230
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Quote:
Originally Posted by AntH3000 View Post
Looks like great component quality as usual, very appealing on that basis alone. Why no 3 gear laydown transmission option though? I'm not aware of any full size motorsport where chassis / suspension arm flex is considered a good thing. If compliance is necessary it is usually introduced via directional rate controlled bushings in between rigid sections. For such an engineering led company the whole flex thing seems a little flaky..IMO anyway.
If you are suggesting that the amount of flex incorporated due to materials used in chassis, arms, towers and other suspension components can't be used successfully to tune the performance of a 1/12, 1/10 or 1/8 scale R/C vehicle you haven't been paying attention for the past 30 years or so

Xray have spent the last 3 years testing different composite blends, materials and layouts to find the optimal configurations.

On the XB2 you have the option of a 4 gear lay down, 3/4 gear mid and 3/4 rear gearbox because these configurations have proved to be the best

And you would be amazed to learn how much of an influence the flex of the different parts affect the handling of the car in terms of mechanical grip, steering and rotation.

Put together one XB2 with all medium composite parts and one with all the aluminum and graphite parts with identical geometry and you will be amazed by the difference in handling and grip.

We've run the XB2 prototypes with different motor positions, chassis in carbon fiber, composite and aluminum and suspension components in different composites for the past 1.5 years during development and the newly released XB2 is the fruit of that labour.

I'm confident that the XB2 will prove to be highly competitive on any surface available to racers today

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Old 11-27-2015, 07:04 AM   #231
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Quote:
Originally Posted by BentKa View Post
If you are suggesting that the amount of flex incorporated due to materials used in chassis, arms, towers and other suspension components can't be used successfully to tune the performance of a 1/12, 1/10 or 1/8 scale R/C vehicle you haven't been paying attention for the past 30 years or so

Xray have spent the last 3 years testing different composite blends, materials and layouts to find the optimal configurations.

On the XB2 you have the option of a 4 gear lay down, 3/4 gear mid and 3/4 rear gearbox because these configurations have proved to be the best

And you would be amazed to learn how much of an influence the flex of the different parts affect the handling of the car in terms of mechanical grip, steering and rotation.

Put together one XB2 with all medium composite parts and one with all the aluminum and graphite parts with identical geometry and you will be amazed by the difference in handling and grip.

We've run the XB2 prototypes with different motor positions, chassis in carbon fiber, composite and aluminum and suspension components in different composites for the past 1.5 years during development and the newly released XB2 is the fruit of that labour.

I'm confident that the XB2 will prove to be highly competitive on any surface available to racers today

Bent
Like I say it does look like a fantastic bit of kit, I think I'd just stick with the stiff material and tune with everything else. I'm not doubting different stiffness arms etc makes a difference but how well is it understood where and by how much things are flexing and what geometry changes are actually happening. I think suspension bushings with different rates will appear at some point...you are in more control with these.
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Old 11-27-2015, 07:18 AM   #232
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Quote:
Originally Posted by AntH3000 View Post
Like I say it does look like a fantastic bit of kit, I think I'd just stick with the stiff material and tune with everything else. I'm not doubting different stiffness arms etc makes a difference but how well is it understood where and by how much things are flexing and what geometry changes are actually happening. I think suspension bushings with different rates will appear at some point...you are in more control with these.
Sticking with only the stiff materials will give you a car that only works on high grip surfaces.

I understand your theory…….problem is….it's just that……theory.

You don't win races sitting behind the computer working in Solidworks or Catia alone.

That's what Xray do so well with their in-house designing and manufacturing.

You literally walk from the track to the manufacturing or designing department and have new parts made or modified and can test them at the same track under same conditions on the same day

What should work in theory doesn't always work as expected in real life testing.

That's just the nature of scaled down vehicles.

Bent
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Old 11-27-2015, 07:35 AM   #233
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Originally Posted by BentKa View Post
Sticking with only the stiff materials will give you a car that only works on high grip surfaces.

I understand your theory…….problem is….it's just that……theory.

You don't win races sitting behind the computer working in Solidworks or Catia alone.

That's what Xray do so well with their in-house designing and manufacturing.

You literally walk from the track to the manufacturing or designing department and have new parts made or modified and can test them at the same track under same conditions on the same day

What should work in theory doesn't always work as expected in real life testing.

That's just the nature of scaled down vehicles.

Bent
Interesting debate, I should perhaps try for myself...!
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Old 11-27-2015, 08:14 AM   #234
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Quote:
Originally Posted by moleman View Post
Where can this setup sheet be found?
Thanks for all the info Bent!

Hope to see you and Malin at a race soon..


Best Regards
Morgan

It's been posted on her page today

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Old 11-27-2015, 08:19 AM   #235
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Interesting debate, I should perhaps try for myself...!
Nothing beats hands on testing and track time

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Old 11-27-2015, 08:29 AM   #236
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Quote:
Originally Posted by AntH3000 View Post
Looks like great component quality as usual, very appealing on that basis alone. Why no 3 gear laydown transmission option though? I'm not aware of any full size motorsport where chassis / suspension arm flex is considered a good thing. If compliance is necessary it is usually introduced via directional rate controlled bushings in between rigid sections. For such an engineering led company the whole flex thing seems a little flaky..IMO anyway.
Packaging a directional rate controlled bushing with the repeatable stiffness properties and the deflections needed to match what can be done with structural stiffness would be challenging I think. While avoiding parasitic effects. Even a simpler bushing without directional tuning would be difficult. I'd love to apply some of this tech but I don't see it being practical.

Bushing compliance also causes geometry changes similar to structural flexing. Suspension design can be used to offset that to a degree thou, different than what is currently used.

If I'm not mistaken many motorsports applications no longer use compliant bushings. Full scale has the advantage of far more sophisticated shock tuning than anyone has managed in scale.
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Old 11-27-2015, 09:13 AM   #237
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Ok debating between this and the Yokomo. Any feedback on how durable it is? Spares are through the roof haha.

Tough call, running on a medium high bite carpet track.
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Old 11-27-2015, 09:37 AM   #238
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Quote:
Originally Posted by AntH3000 View Post
Looks like great component quality as usual, very appealing on that basis alone. Why no 3 gear laydown transmission option though? I'm not aware of any full size motorsport where chassis / suspension arm flex is considered a good thing. If compliance is necessary it is usually introduced via directional rate controlled bushings in between rigid sections. For such an engineering led company the whole flex thing seems a little flaky..IMO anyway.
Then you're very novice to real racing. Several platforms and race cars work direct with a tuneable amount of flex within a chassis and suspension components. This is why there was a difficult time with Aluminium chassis in many different motorsports at first. Then there was the learn stages of carbon - both were just TOO rigid to start with.

Look at motogp as we speak, there is now several generations of carbon and alloy frames that just don't provide the feel that a chassis that isn't too rigid does. Motocyzz? I think was the guy, that had a very tough time working out flex and stichion in forks and suspension components for years.

RC cars continue to fall into an odd category - enormous horsepower with VERY high corner speeds translates to very critical handling.
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Old 11-27-2015, 10:07 AM   #239
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Originally Posted by 3srcracing View Post
Ok debating between this and the Yokomo. Any feedback on how durable it is? Spares are through the roof haha.

Tough call, running on a medium high bite carpet track.
Nobody really has the car yet so it's hard to say. I sold my yz-2 for the xb2. Hopefully the car will arrive next week!
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Old 11-27-2015, 10:20 AM   #240
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http://www.rcjaz.com/xray-xr320001-x...-90071398.html

If anyone is interested.
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