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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 03-13-2016, 06:03 PM   #1921
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Quote:
Originally Posted by STLNLST View Post
I feel Xray should have gone with a 72 spur rather than a 69.
69 is the go-to staple spur for 17.5 racing.
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Old 03-13-2016, 06:34 PM   #1922
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Finally got my DE built and on the track. Went 2x1.6 pistons F+R and 500/400 oils, 3mm of limiters in the front, 0 in the rear. Car was extremely good. Our track is high bite clay and the CE has been really good and I didn't expect the DE to be as good, but now I'm not sure what to think. I can go about the same speed and same pace with both cars, just the CE has more corner speed while I can drive the DE a bit more strapped. This is like having the ultimate duo of 2wd buggies.
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Old 03-13-2016, 06:56 PM   #1923
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Default DE felt great on the track!!

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!!
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Old 03-13-2016, 07:08 PM   #1924
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Quote:
Originally Posted by Customworksking View Post
when the dirt car came in I asked RCA if they had the parts to convert and was told no
Most of the DE parts arrived here in Australia. I know the diff case didn't arrive.


A few of my back up online stores are saying 'out of stock' too.

Maybe not enough diff cases were produced.
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Old 03-13-2016, 07:33 PM   #1925
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Quote:
Originally Posted by Cpt.America View Post
69 is the go-to staple spur for 17.5 racing.
Its all depends on the motor. 69 is the staple for the Trinity based motors. All others are typically a 72/30-33 gearing. There are a few that run a 75 but thats more so because that is where the powerband is. A lot of stock guys here on the west coast (Arizona/California/Nevada/Washington) are preferring the 64 pitch gears of Schelle to run an even more precise gearing.
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Old 03-13-2016, 07:44 PM   #1926
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Quote:
Originally Posted by seth556 View Post
Finally got my DE built and on the track. Went 2x1.6 pistons F+R and 500/400 oils, 3mm of limiters in the front, 0 in the rear. Car was extremely good. Our track is high bite clay and the CE has been really good and I didn't expect the DE to be as good, but now I'm not sure what to think. I can go about the same speed and same pace with both cars, just the CE has more corner speed while I can drive the DE a bit more strapped. This is like having the ultimate duo of 2wd buggies.
very interesting. Maybe you can try it at New Reds and see which does better there.

sounds like you like the DE version more.
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Old 03-13-2016, 07:44 PM   #1927
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Originally Posted by Cpt.America View Post
69 is the go-to staple spur for 17.5 racing.
All the races our locals have been winning they are using a 72. Jconcepts, Cactus, Surf City, Stock nats, A-main finalist.......All 72
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Old 03-13-2016, 07:59 PM   #1928
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The car box set up has tons of off power steering. I had to raise rear roll center and remove Ackerman at steering rack. I also used 1.4 3 hole Pistons front and back with stock springs.
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Old 03-14-2016, 03:47 AM   #1929
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Interesting on the 17.5 spur topic... I would have thought it was more attributable to the cars internal gear ratio?
Something more like 69-70 spur for XRAY/Associated (2.65/2.6 internal) and 72 for Losi/Serpent (2.43 internal)...
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Old 03-14-2016, 07:13 AM   #1930
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Quote:
Originally Posted by STLNLST View Post
All the races our locals have been winning they are using a 72. Jconcepts, Cactus, Surf City, Stock nats, A-main finalist.......All 72
Where can I get a 72? Seems like AMain only has listings for 75T Xray Spurs.

Thanks in Advance!
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Old 03-14-2016, 08:06 AM   #1931
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Where can I get a 72? Seems like AMain only has listings for 75T Xray Spurs.

Thanks in Advance!
No direct fit offering for a 72 tooth spur right now from XRAY (or any other manufacturer that I am aware of).

If you go to the Exotek "XB2 DIRECT SPUR MOUNT" (1582) you can use their "FLITE SPUR GEAR" (1590), or a Kimbrough 72 tooth (143).
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Old 03-14-2016, 09:10 AM   #1932
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What size of ball stud is needed on the rear ups to run malins eos 2016 2 setup ?
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Old 03-14-2016, 11:24 AM   #1933
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10mm
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Old 03-14-2016, 11:24 AM   #1934
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Quote:
Originally Posted by STLNLST View Post
All the races our locals have been winning they are using a 72. Jconcepts, Cactus, Surf City, Stock nats, A-main finalist.......All 72
@STLNLST: Are they using the Direct Spur setup???
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Old 03-14-2016, 11:25 AM   #1935
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I've just ordered up my kit from Amain. Excited to join the Xray buzz
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