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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 03-21-2016, 07:40 AM   #2086
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Originally Posted by 13Maschine View Post
I'm still building my CE up, had to pause and wait for a set of Lunsford Titanium Screws. So far it's a really nice build, I've completed the transmission and shocks, not much else I can do without screws though. I do wish they would have given machined pistons though, pistons on a tree aren't generally very round and you always need to sand a bit to make them smooth, causing flat spots.

Overall the car seems really nice and I am really impressed with the design. Nice to see a motor mount that is fully secure by locking it into the waterfall in front of the motor. It's awesome that it comes stock with rear alum suspension holders with eccentric bushings. The transmission has alignment pins to keep your gear mesh in check. Quick swap diff? AWESOME.

Has anyone upgraded their pistons? I was considering the Avid 2+2 setup...
I use the avid 2+2 setup in mine, 1.5 front with 1.6 rear.
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Old 03-21-2016, 08:28 AM   #2087
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Everyone must still be building. I've only seen a couple people with detailed reviews (QDRHORSE, thx). Can anyone else opine on the performance in relation to a B5M? How about Dirt vs. Carpet? Looks great
Seth's CE is quite dialed. I've driven it and it is impressive on the track.
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Old 03-21-2016, 09:32 AM   #2088
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I use the avid 2+2 setup in mine, 1.5 front with 1.6 rear.
Thanks Willis! I'll have to come visit you in Sacremento for some racing. My home office is in Folsom so I am usually in Sacremento area every other month or so. I'll PM you...

Did you buy bother the 1.5 and 1.6 sets of four or do they have a combo pack? What oil are you using?
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Old 03-21-2016, 09:43 AM   #2089
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Thanks Willis! I'll have to come visit you in Sacremento for some racing. My home office is in Folsom so I am usually in Sacremento area every other month or so. I'll PM you...

Did you buy bother the 1.5 and 1.6 sets of four or do they have a combo pack? What oil are you using?
I actually run the Tworkz pistons. I buy the 1.5 4pack and drill them to what I want. I am running 32.5 front and 30 rear. I am using AE oils at the moment but that is looking to switch here soon.
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Old 03-21-2016, 10:51 AM   #2090
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I use the avid 2+2 setup in mine, 1.5 front with 1.6 rear.
Did you have to sand down the piston to make it fit?? I tried AE pistons and they are to thick I couldn't get an E clip on top.
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Old 03-21-2016, 11:36 AM   #2091
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@willS: Tworks pistons on the Xray Xb2? Not avid?
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Old 03-21-2016, 01:40 PM   #2092
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Front spring rate is c=0.70. What does that equate to in lbs. rear is c=0.53 any conversions. And what is C??
0.70c is 3.997 in-lbs
0.53c is 3.026 in-lbs
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Old 03-21-2016, 01:50 PM   #2093
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Did you have to sand down the piston to make it fit?? I tried AE pistons and they are to thick I couldn't get an E clip on top.
you have to get the xray ones.. AE are too thick.. look in the XB4 section

they are currently out of stock btw.

AV1033-1.6-1.1-F-2PK
AV1033-1.5-1.1-F-2PK
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Old 03-21-2016, 03:22 PM   #2094
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Everyone must still be building. I've only seen a couple people with detailed reviews (QDRHORSE, thx). Can anyone else opine on the performance in relation to a B5M? How about Dirt vs. Carpet? Looks great
So far the carpet edition has been really great on indoor carpet tracks for me. I have been consistently faster with this car than with the B5M. It will be interesting to see how much better the B5M will be when the laydown tranny finally makes its way to the states. I would recommend this car to anyone who just can't seem to get anymore out of the B5m. You will be faster with this car. Box stock setup needs a little tweaking, but it's a good starting point. Currently running mostly on foam tires, med grip carpet track. 17.5 and 13.5.
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Old 03-21-2016, 05:04 PM   #2095
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when i built my DE, i noticed at the end of the instruction book that the gearbox can be built to run the motor on the opposite side.

has anyone tried this config? effects of handling/jumps?
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Old 03-21-2016, 05:06 PM   #2096
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@macdude: are you racing Carpet Offroad?? With foam tires? What kind of tires?
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Old 03-21-2016, 05:40 PM   #2097
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Front spring rate is c=0.70. What does that equate to in lbs. rear is c=0.53 any conversions. And what is C??
i see that someone answered you already but these are not the stock springs.

the stock rear is a 1 dot that is c=0.35/2.0 lb. the stock fronts are definitely not c=0.70/4.0 lb, the 2 dot is a c=0.65/3.71 lb.

anyone know what the specs for the front 1 dots are?
my guess is c=0.57 or 0.58 = 3.25 or 3.31 lbs

Front
368183 Linear 1 dot C=??
368184 Linear 2 dot C=0.65 or 3.71 lbs/inch
368185 Linear 3 dot C=0.72 or 4.11 lbs/inch
368186 Linear 4 dot C=0.80 or 4.57 lbs/inch
386174 Progressive 2 stripes C=0.65-0.85 or 3.71-4.85 lbs/inch

Rear
368284 Linear 1 dot C=0.35 or 2.00 lbs/inch
368285 Linear 2 dot C=0.40 or 2.28 lbs/inch
368286 Linear 3 dot C=0.45 or 2.57 lbs/inch
368287 Linear 4 dot C=0.50 or 2.86 lbs/inch
386273 Progressive 2 stripes C=0.35-0.45 or 2.00-2.57 lbs/inch
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Old 03-21-2016, 05:56 PM   #2098
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@macdude: are you racing Carpet Offroad?? With foam tires? What kind of tires?
i'm not who you asked...friend of mine races at a track midwest where they only run foam. no rubbed pinned or spike tires allowed. they run these

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Old 03-21-2016, 06:10 PM   #2099
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@willS: Tworks pistons on the Xray Xb2? Not avid?
Tworks sells them by 4 instead of pairs and much cheaper. They need to be Xray specific pistons. You can find them on ebay using the search Machined Xray Xb4 Pistons .
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Old 03-21-2016, 07:22 PM   #2100
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i see that someone answered you already but these are not the stock springs.

the stock rear is a 1 dot that is c=0.35/2.0 lb. the stock fronts are definitely not c=0.70/4.0 lb, the 2 dot is a c=0.65/3.71 lb.

anyone know what the specs for the front 1 dots are?
my guess is c=0.57 or 0.58 = 3.25 or 3.31 lbs

Front
368183 Linear 1 dot C=??
368184 Linear 2 dot C=0.65 or 3.71 lbs/inch
368185 Linear 3 dot C=0.72 or 4.11 lbs/inch
368186 Linear 4 dot C=0.80 or 4.57 lbs/inch
386174 Progressive 2 stripes C=0.65-0.85 or 3.71-4.85 lbs/inch

Rear
368284 Linear 1 dot C=0.35 or 2.00 lbs/inch
368285 Linear 2 dot C=0.40 or 2.28 lbs/inch
368286 Linear 3 dot C=0.45 or 2.57 lbs/inch
368287 Linear 4 dot C=0.50 or 2.86 lbs/inch
386273 Progressive 2 stripes C=0.35-0.45 or 2.00-2.57 lbs/inch
Thanks!! I realized I was looking at the wrong model number. It was for the colored springs. They are Off by one number. All the springs are rated kg/mm. 1lbs/in = 0.178kg/mm
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