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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 01-10-2016, 12:52 PM   #931
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Quote:
Originally Posted by seth556 View Post
Awesome!
So it's worth buying even considering no LHS parts support and having to get hexes to make the wheels I already have work due to different offset?
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Old 01-10-2016, 04:52 PM   #932
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Anyone have any shorty servos in their car, if so what fits without modding the wire
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Old 01-10-2016, 05:42 PM   #933
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Originally Posted by jswo View Post
Anyone have any shorty servos in their car, if so what fits without modding the wire
http://www.amainhobbies.com/rc-cars-...366201/p358316
I am using X-ray servo mount for the shorty.
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Old 01-10-2016, 05:52 PM   #934
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Originally Posted by spu83 View Post
http://www.amainhobbies.com/rc-cars-...366201/p358316
I am using X-ray servo mount for the shorty.
Thanks, what servo do you use
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Old 01-10-2016, 06:34 PM   #935
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Didn't Brent say that changes the geometry using the aluminum mounts?
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Old 01-10-2016, 07:07 PM   #936
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Coming from an RB6. The XB2 was definitely an impulse buy. My track is a smaller indoor astro turf track with high traction. The RB6 was in my opinion pretty darn good, but I get bored easily. I love my newly built 2016 XB4 so much, that for now, I have decided to part ways with Kyosho. People think I'm taking a step back... but the XB4 is no joke. I'm hoping the carpet edition XB2 is also similar in feel and track manners.

I understand how new the XB2 chassis is, but I will have it in a few days and I'm in need for a good astro setup. The Bruno Coelho worlds setup was great for the 16 XB4. Any good starting points that I am not aware of for the XB2?
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Old 01-10-2016, 07:21 PM   #937
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Originally Posted by jswo View Post
Anyone have any shorty servos in their car, if so what fits without modding the wire
I am using a Xpert 3401 servo and didn't have to mod the wire.
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Old 01-10-2016, 07:23 PM   #938
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Quote:
Originally Posted by billdelong View Post
Here's some pics from my TLR 22-3.0 build, I'd be very interested to see what the measurements are for each comparable XB2 part so we we're comparing apples to apples:

Stock Ball diff in the kit = 32.5g


Stock Gear diff from XXX series which is forward compatible with the 22 series = 36.2g


MIP Lightened Ball Diff = 17.2g


Stock Slipper pad parts = 12.4g


Exotek Slipper Eliminator Upgrade = 3.8g


Stock CVD's = 24.9g


MIP Puck CVD's = 17.8g


Obviously weight doesn't matter for open mod cars, but anyone who has raced a stock class with stock parts and then switched to lightened parts will see a significant difference in performance with shorter ramp ups to clear jumps allowing tighter lines, faster acceleration and faster top speed.

*** UPDATE

Stock steel screws on slipper eliminator = 1.3g


Upgraded titanium screws = 0.7g
Here is what I got..

Stock slipper parts.. 13.8g
Stock rear axels. 21.9g
Stock ball diff.. 28.7g

I didn't pull out the gear diff.. Or their screws..
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Old 01-10-2016, 07:26 PM   #939
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i have been looking at this buggy and i am pretty sure it is going to be my next purchase... One thing i dont understand, what the is the "Luxury" part of the truck that is on the box and in the advertisements?

I get i dont understand the marketing on it...any have an idea what its about
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Old 01-10-2016, 07:41 PM   #940
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Quote:
Originally Posted by rekim View Post
i have been looking at this buggy and i am pretty sure it is going to be my next purchase... One thing i dont understand, what the is the "Luxury" part of the truck that is on the box and in the advertisements?

I get i dont understand the marketing on it...any have an idea what its about
X-Ray is being marketed as an "upscale" brand. Think Mercedes not Ford or Chevy.
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Old 01-10-2016, 07:58 PM   #941
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Quote:
Originally Posted by jswo View Post
Thanks, what servo do you use
Xpert 3402
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Xray XB2 2WD Buggy Thread-image.jpg  
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Old 01-10-2016, 08:03 PM   #942
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Quote:
Originally Posted by Dave H View Post
Regarding the mass distribution, for a simple rod like an axle shaft the formula is



A handy List of moments of inertia for various shapes, which is also linked from the page Seth provided. Although to be fair I don't think it changes your conclusions, just occurred to me while reading along.

Something that will matter, for the spur the rotational speed needs to be considered, as it also spins faster than the axle shafts if I'm not mistaken. Which takes more energy to achieve. Another squared factor:



Rotational energy

Although the lighter axle components do have the additional benefit of reducing unsprung suspension mass, which is a good thing too.

Slow down.

I'm still getting use to red to + and black to -..........
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Old 01-10-2016, 08:19 PM   #943
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Originally Posted by spu83 View Post
Xpert 3402
looks good, anyone know if the aluminum servo mount changes anything?
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Old 01-10-2016, 08:32 PM   #944
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Originally Posted by dgrobe2112 View Post
Here is what I got..

Stock slipper parts.. 13.8g
Stock rear axels. 21.9g
Stock ball diff.. 28.7g

I didn't pull out the gear diff.. Or their screws..
Thanks for taking the measurements Daniel... very interesting comparisons; are you gonna run your XB2-DE in stock or mod?
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Old 01-10-2016, 08:37 PM   #945
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All I gotta say about this car is WOW! I previously had the yz 2 and it was no where near as good as the xb2. On our high bite carpet track I was turning lap times almost identical to my xb4 16! Box stock minus I switched to yatabe springs that suit my driving style more, yellow front green rear and malins hudy arena setup. I can't wait to get the front brass kickup and battery weight. At 1475 the front end just felt a tad light but the car was on rails and super consistent, easily the best 2wd buggy I have driven. Xray knocked it outta the park with this car!
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