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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 03-14-2016, 05:29 PM   #1936
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My comment was stating that most all the fast stock racers at my track run a 72 spur in general. Not that Xray driver's are running a 72. IMO I feel that if you're going to try and tap the spec market i'd go with a 72 rather than a 69. I'll keep my eye on the car and see if I can help the locals with it.
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Old 03-14-2016, 06:05 PM   #1937
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IMO I feel that if you're going to try and tap the spec market i'd go with a 72 rather than a 69.
Question - If the transmission ratio is constant (2.65 in xb2), does it really matter what spur you run if the gear ratio is the same? A 75/36 (2.083) should run close to a 69/33 (2.091), which should run close to a 66/32 (2.063), right? Other than a slight weight transfer due to motor position, is there something else I'm missing?
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Old 03-14-2016, 06:17 PM   #1938
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Again an issue with the hinge pin 2.5mm retaining screw. The head is not wide enough or the hole is not close enough to the hinge pin. The pin just slides past it. So got some 2.5x5 washers now all is better! Great handling car!!
Has anyone else had this problem? I haven't run my Dirt Edition yet but I did notice the head is not wide enough or the screw is not close enough to the pin.
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Old 03-14-2016, 06:44 PM   #1939
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Currently running Robinson Racing aluminum pro pinions black coated

Are the Xray pinions any quiter.

Also what are thoughts on running the Xray narrow pinions has anyone tried them if so whats the noise like.
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Old 03-14-2016, 06:48 PM   #1940
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Has anyone else had this problem? I haven't run my Dirt Edition yet but I did notice the head is not wide enough or the screw is not close enough to the pin.
Yes I had the same thing. I tightened down the screw a little more and it barely keeps it from coming out.
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Old 03-14-2016, 06:49 PM   #1941
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Question - If the transmission ratio is constant (2.65 in xb2), does it really matter what spur you run if the gear ratio is the same? A 75/36 (2.083) should run close to a 69/33 (2.091), which should run close to a 66/32 (2.063), right? Other than a slight weight transfer due to motor position, is there something else I'm missing?
Motor position and mechanical torque advantage play a part in the spur selection.
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Old 03-14-2016, 07:14 PM   #1942
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Oddly enough I found out that 69/32 will not fit with the slipper eliminator. Looks like I'm going to have to either try 69/33 or 72/32. They do have a 72 spur FYI. I'm Not sure if its an AE part or Kimborough but it exists. If I can find one new in the package I'll post a pic.
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Old 03-14-2016, 07:18 PM   #1943
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How do u stop the body from moving around and hitting the top shaft ? I used a lot of Velcro ? Lol
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Old 03-14-2016, 07:38 PM   #1944
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How do u stop the body from moving around and hitting the top shaft ? I used a lot of Velcro ? Lol
i ended up just cutting the body a lot. i no longer just have a hole for it
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Old 03-14-2016, 08:03 PM   #1945
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Hope they come out with some different bodies? body mounts would of been cool
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Old 03-14-2016, 08:21 PM   #1946
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2 options for 72 spur if you use a slipper eliminator. 1) ASC3922 for the AE gear and 2) EXO1590 for the new Exotek delrin gear.
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Old 03-14-2016, 08:34 PM   #1947
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Originally Posted by SevetS View Post
Question - If the transmission ratio is constant (2.65 in xb2), does it really matter what spur you run if the gear ratio is the same? A 75/36 (2.083) should run close to a 69/33 (2.091), which should run close to a 66/32 (2.063), right? Other than a slight weight transfer due to motor position, is there something else I'm missing?
Yes and no. They can have a different feel even though the FDR is the same. You can feel the difference between 69 and 72 on the track.
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Old 03-14-2016, 08:56 PM   #1948
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Has anyone else had this problem? I haven't run my Dirt Edition yet but I did notice the head is not wide enough or the screw is not close enough to the pin.
Iv'e had my CE since December and haven't had that problem. As you can see in the picture it barley makes contact with the hinge pin.

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Old 03-14-2016, 10:18 PM   #1949
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Originally Posted by STLNLST View Post
My comment was stating that most all the fast stock racers at my track run a 72 spur in general. Not that Xray driver's are running a 72. IMO I feel that if you're going to try and tap the spec market i'd go with a 72 rather than a 69. I'll keep my eye on the car and see if I can help the locals with it.
Relax!! they already stated they will be working on a 69 and a 72.
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Old 03-14-2016, 11:54 PM   #1950
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Need to dremel out the motor plate if using a 69/32 or smaller pinion. Or just stay 72! I assume that's why a 75 is only available.
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