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R/C Tech Forums Thread Wiki: Official 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 11-30-2015, 10:30 PM   #316
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Bent, will a YZ-2 body fit on the XB2? I thought I saw some photos of prototypes running with YZ-2 bodies in the past year sometime.

And thank you for providing your insights about the Xray cars! It is absolutely great to get the inside story on the product development! Please keep it up.

PS- Will Xray release a Titanium screw and turnbuckle set for the XB2? I don't know the XB4 well enough to know if Xray produces these for their offroad cars or if it is strictly an aftermarket thing?

Last edited by avaldes; 11-30-2015 at 10:55 PM.
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Old 12-01-2015, 09:13 AM   #317
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Quote:
Originally Posted by avaldes View Post
Bent, will a YZ-2 body fit on the XB2? I thought I saw some photos of prototypes running with YZ-2 bodies in the past year sometime.

And thank you for providing your insights about the Xray cars! It is absolutely great to get the inside story on the product development! Please keep it up.

PS- Will Xray release a Titanium screw and turnbuckle set for the XB2? I don't know the XB4 well enough to know if Xray produces these for their offroad cars or if it is strictly an aftermarket thing?
I suggest you try Lunsford for Titanium. Top notch product. In fact, he is running a sale right now. http://www.lunsfordracing.com/mm5/merchant.mvc
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Old 12-01-2015, 03:05 PM   #318
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Can someone explain how to tune with the eccentric suspension bushings? For example, the difference in bushings for low, medium, or high traction?
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Old 12-01-2015, 03:09 PM   #319
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can't wait to see one of these in action. the design is really cool. curious to see how the dirt version performs.
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Old 12-01-2015, 03:29 PM   #320
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Quote:
Originally Posted by dchavez305 View Post
Can someone explain how to tune with the eccentric suspension bushings? For example, the difference in bushings for low, medium, or high traction?
Also would moving the shocks to the rear of the 2wd carpet give it more rear traction?
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Old 12-01-2015, 04:39 PM   #321
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Quote:
Originally Posted by dchavez305 View Post
Can someone explain how to tune with the eccentric suspension bushings? For example, the difference in bushings for low, medium, or high traction?
Quote:
Originally Posted by dchavez305 View Post
Also would moving the shocks to the rear of the 2wd carpet give it more rear traction?
It's such a brilliant yet simple design. I cant for the like of me understand why other companies don't use this philosophy, we'll actually i can, other companies force you to buy all sorts of option parts.

It allows you to change the track with and rollcenter at the hinge pin.Running the hinge pins in narrows the car at the hinge pins which allows that end to roll more which can create more grip. Moving the hinge pins up raises the roll center and keeps the car flatter in the turns, moving the hinge pin down lowers lowers the roll center allowing the car to roll more, which can create more side bite. You can also adjust the anti squat and toe in....
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Last edited by symmetricon; 12-01-2015 at 05:04 PM.
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Old 12-01-2015, 05:34 PM   #322
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Quote:
Originally Posted by symmetricon View Post
It's such a brilliant yet simple design. I cant for the like of me understand why other companies don't use this philosophy, we'll actually i can, other companies force you to buy all sorts of option parts.

It allows you to change the track with and rollcenter at the hinge pin.Running the hinge pins in narrows the car at the hinge pins which allows that end to roll more which can create more grip. Moving the hinge pins up raises the roll center and keeps the car flatter in the turns, moving the hinge pin down lowers lowers the roll center allowing the car to roll more, which can create more side bite. You can also adjust the anti squat and toe in....

ok so for the xb2. i want more rear grip so I should run the RF in the inside position and the RR in the inside position?
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Old 12-01-2015, 08:01 PM   #323
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Quote:
Originally Posted by dchavez305 View Post
ok so for the xb2. i want more rear grip so I should run the RF in the inside position and the RR in the inside position?
The question is, where do you need more grip, on or off power, entry, mid or exit steering? I'm assuming your talking about the rear end being loose?
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Old 12-02-2015, 04:14 AM   #324
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The question is, where do you need more grip, on or off power, entry, mid or exit steering? I'm assuming your talking about the rear end being loose?
I would say just overall rear grip. Just a little more
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Old 12-02-2015, 05:25 AM   #325
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Quote:
Originally Posted by BentKa View Post
No I haven't yet, but I have the G-Force X weight system here so I might do it eventually

Bent
Hi Bent,

can you please tell us the overall weight and distribution of the xb2?

Thanks,
Andrea
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Old 12-02-2015, 05:28 AM   #326
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Towards the back of the Hudy on-road tuning guide, they post a nice reference chart that shows how to get more traction, and I've found it fairly universal for my off-road cars too:

Hudy Setup Guide

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Old 12-02-2015, 05:46 AM   #327
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Quote:
Originally Posted by dchavez305 View Post
I would say just overall rear grip. Just a little more
Move the hinge pins in and down, you can also add more toe in...
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Old 12-02-2015, 07:27 AM   #328
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Just got off the phone with Rc America. Kits should be going out later today and tomorrow so get ready everyone!
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Old 12-02-2015, 07:56 AM   #329
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Quote:
Originally Posted by Xan83 View Post
Hi Bent,

can you please tell us the overall weight and distribution of the xb2?

Thanks,
Andrea
Sorry no…..haven't had in on the scales yet.

As for RTR weight we are at 1515-1585 depending on added weight.

1515g is RTR with full size Futaba servo, ORCA 4800mAh shorty, all stock hardware and Schumacher pre-glued Cut Stagger/Mini Pin tires on Schumacher wheels.

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Old 12-02-2015, 07:58 AM   #330
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Quote:
Originally Posted by dchavez305 View Post
I would say just overall rear grip. Just a little more
Where are you running your battery ?
Do you have downstop shims in any of your shocks ?
What wheelbase/shims do you run on front hubs, rear arms and rear uprights ?
Are you running hard or medium rear arms and uprights ?
What screws are you running for the motor mount brace on top and bottom ?

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Last edited by BentKa; 12-02-2015 at 08:15 AM.
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