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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 12-17-2015, 03:59 PM   #571
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Sorry guys, I m done
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Old 12-17-2015, 04:04 PM   #572
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Any word on some smaller Spur Gears for the mates that race stock in the States?
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Old 12-17-2015, 04:07 PM   #573
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Quote:
Originally Posted by symmetricon View Post
Does a softer spring not yield more traction?
Yes while cornering (it lower's the roll center the more you roll).
Yes/no on bumps or smooth track it depends of course.
No while accelerating in a dead straight line (but the car will be more stable then which could FEEL in more traction but actually won't give more).
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Old 12-17-2015, 04:25 PM   #574
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Quote:
Originally Posted by shannow View Post
Yes while cornering (it lower's the roll center the more you roll).
Yes/no on bumps or smooth track it depends of course.
No while accelerating in a dead straight line (but the car will be more stable then which could FEEL in more traction but actually won't give more).
Ok, I don't disagree with anything you say. I understand there is a difference between the car pivoting and having actual weight transfer. I guess what's hard to calculate as a total is where stability and traction converge. I guess my error is in not differentiating between stability and mechanical traction, I used improper verbage.
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Old 12-17-2015, 07:39 PM   #575
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Quote:
Originally Posted by symmetricon View Post
I don't want to get into a debate about anti squat but if 2 springs have the same rate:
Spring A compresses 10 cm
Spring B compresses 20 cm
Which spring has more force or weight applied on it?

Is this not the same reason why a softer spring in the rear will allow more rear grip?
There is more than spring force involved when looking at anti squat. The anti squat generates vertical force from the suspension geometry that adds with the shock/spring forces.

Tricky to explain, hope this makes some sense, how it was always explained to me. From the side view adding anti squat causes the suspension travel to move not vertically but at an angle. With wheel down/rebound travel the wheels go forward a little. Under acceleration there is essentially a wedge effect, the wheels try to go forward and ride that angle down some. This forces the arm down - chassis up, that force adds to the shock spring force.

In practice the dynamics come into play, and like many chassis questions depends on traction, surface smoothness, and even driving style. The anti squat force happens quickly compared to the relatively slow action of the shock/spring and chassis movement, and it's less compliant. Ideal conditions, high traction smooth surface, anti squat can create a more immediate response and better acceleration. Less than ideal, lower traction and bumpy, the extra compliance of using the springs can help prevent breaking traction.

Short answer, it's possible for either to be true in a sense. Nobody said it was going to be easy, but that's part of the fun, the challenge.
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Old 12-17-2015, 09:34 PM   #576
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Default Drilling Pistons

I'm a newbie t both carpet and Xray. And very stoked to say I just ordered my XB2 carpet. I've been following this entire thread and wanted to ask what do you use to drill your own Pistons? Bentka replied back that all the sponsored drivers are using the blanks and drilling them 1.6 & 1.7. What tools and or methods do people use to getting it right? Thanks
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Old 12-17-2015, 10:04 PM   #577
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Hey Kibish, there are several brands you can use. I have used this one with good luck, feel free to check it out:

http://www.amainhobbies.com/rc-cars-...-gmk0108/p7599
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Old 12-17-2015, 10:51 PM   #578
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Quote:
Originally Posted by kbish76 View Post
I'm a newbie t both carpet and Xray. And very stoked to say I just ordered my XB2 carpet. I've been following this entire thread and wanted to ask what do you use to drill your own Pistons? Bentka replied back that all the sponsored drivers are using the blanks and drilling them 1.6 & 1.7. What tools and or methods do people use to getting it right? Thanks
Quote:
Originally Posted by 3srcracing View Post
Hey Kibish, there are several brands you can use. I have used this one with good luck, feel free to check it out:

http://www.amainhobbies.com/rc-cars-...-gmk0108/p7599
I have the exact same set from GMK

Bent
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Old 12-18-2015, 02:43 AM   #579
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A couple of updates on the progress of the XB2 Dirt Edition from Juraj Hudy:

Quote:
Final pre-production rapid prototype of the gear box cover installed on the motor holder. All fits nicely.
Quote:
The gear box mould for XB2 Dirt in production.

Quote:
Brass electrodes for the XB2 Dirt gear box. The black ones are already used.
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Old 12-18-2015, 03:47 AM   #580
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Quote:
Originally Posted by BentKa View Post
A couple of updates on the progress of the XB2 Dirt Edition from Juraj Hudy:








Bent
Honestly xrays look like a work of art whether in pre production or production form, even the tooling looks unbelievable, do we have an Eta yet on the dirt edition
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Old 12-18-2015, 09:11 AM   #581
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Does anyone know if the Schumacher Cougar 71T Slipper Spur Gear fits the XB2? Need a smaller spur for 17.5 Stock racing...
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Old 12-18-2015, 09:19 AM   #582
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Very impressive that Hudy has an EDM machine in-house and that they use it for all of their tooling. Also impressive that they have injection molding in-house! It is no longer the American business model to have engineering and manufacturing under one roof like that. Very cool!
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Old 12-18-2015, 09:36 AM   #583
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Alright, took the day off to dial in my XB2 and have reached and awesome indoor clay high bite setup! The car is easily as good as my rb6 was that I had for 6 months with to setup. I picked up another 3/10 of a second, more corner speed and more rear grip all with stock components...
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Old 12-18-2015, 09:41 AM   #584
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Quote:
Originally Posted by lewis4x4 View Post
Does anyone know if the Schumacher Cougar 71T Slipper Spur Gear fits the XB2? Need a smaller spur for 17.5 Stock racing...
i drilled an AE 72, took 3 trys to get it clamped straight in drill press,
but i got 72 tooth to work
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Old 12-18-2015, 11:40 AM   #585
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Quote:
Originally Posted by symmetricon View Post
Alright, took the day off to dial in my XB2 and have reached and awesome indoor clay high bite setup! The car is easily as good as my rb6 was that I had for 6 months with to setup. I picked up another 3/10 of a second, more corner speed and more rear grip all with stock components...
With the "carpet" version, correct?

I understand the "dirt" car isn't yet complete?

Wow, looking to be a very capable buggy platform.
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