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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 01-07-2016, 01:08 AM   #901
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Quote:
Originally Posted by shannow View Post
Mine isn't particularly loud. It's slightly louder than non covered gears in 2wd buggy but to notice it you'd have to be pretty picky.
One thing I discovered a couple of years ago is that all pinion are not made equal. I have a compete set of pinions but not from the same manufacturer and some of them are super loud ! They didn't harm the spur but my god the noise makes it very worrying. The loudest I have is one that looks like the titanium ultimate racing ones. I can't confirm you that's the brand as it's not written on them and I bough it 5-6years ago so I can't remembrer, but it's the loudest hands down by a lot !
Wait till you try the old-gen losi steel ones

To be honest, I have to admit the transmission on mine spins free (better than my 4G RB6's for instance), but is somewhat loud anyway. It might not just be the spur. Curious to see how such hard plastics wear out.
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Old 01-07-2016, 02:12 AM   #902
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Quote:
Originally Posted by Lonestar View Post
Wait till you try the old-gen losi steel ones

To be honest, I have to admit the transmission on mine spins free (better than my 4G RB6's for instance), but is somewhat loud anyway. It might not just be the spur. Curious to see how such hard plastics wear out.
The loud one I have looks exactly like this one but without the brand and polished finish :


I did put a lot of black grease inside the gear box on the idle gears and the diff. The xb2 I have is barely louder than my B5m.
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Old 01-07-2016, 12:59 PM   #903
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Default XB2 slipper eliminator and 69T spur gear.

Talked briefly to Juraj today regarding the possibility of manufacturing a slipper eliminator and 69T spur gear

Will pick up conversation again tomorrow

Now back to assembling the ECS shafts for the race tomorrow

Bent
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Old 01-07-2016, 01:10 PM   #904
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Quote:
Originally Posted by BentKa View Post
Talked briefly to Juraj today regarding the possibility of manufacturing a slipper eliminator and 69T spur gear

Will pick up conversation again tomorrow

Now back to assembling the ECS shafts for the race tomorrow

Bent
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Old 01-07-2016, 01:44 PM   #905
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Originally Posted by BentKa View Post
Talked briefly to Juraj today regarding the possibility of manufacturing a slipper eliminator and 69T spur gear
This is the main reason I decided to go with a TLR last month, plenty of support for lightened parts for Stock racing and honestly I've had no complaints running TLR but would love to give the XB2-DE a shot if there was more support for 17.5T Stock parts. I also dropped 24.2g using MIP lightened out drives and shafts, would be nice to see the same option available for the XB2 as well.

The TLR slipper eliminator only dropped 8.6g with that mod, so I would feel that the other lightened parts would be higher priority to get me motivated in buying a XB2-DE + lightened drive line parts support.

Don't really need to make a new spur gear so long as you guys do something similar to what Exotek is doing by making their slipper eliminator compatible with Kimbrough spur gears, or some other popular brand of spur gear manufacturer for touring cars..

Doesn't matter to me if XRay makes the parts or if they coordinate with MIP and Exotek to do what they already have available for TLR.
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Old 01-07-2016, 01:45 PM   #906
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Ok just back from a 90mn session downstairs at the workshop. XB2 is almost done, it needs its shocks (waiting for my milled pistons), Rx, ESC. body, wing... What an amazing piece of kit, I never managed to get a car assembled to my quality standards so fast... until...

...I struggled to get the gear mesh right (8.5T, 81/24) for a while until I realized this was because the spur has a LOT of RADIAL play, about 1mm at the end, it isn't wobbly, it's just sloppy... actually, it's not just the spur but the whole top shaft assembly.

I'm going to pull it apart tomorrow (sigh) but any suggestions where to look for? I can only think of a poorly seated bearing, or a defective one... Any common mistake I might have done that you guys can suggest? Both sides of the gearbox seem to be assembled properly...

Thanks,
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Last edited by Lonestar; 01-07-2016 at 02:02 PM.
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Old 01-07-2016, 02:25 PM   #907
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Quote:
Originally Posted by billdelong View Post
This is the main reason I decided to go with a TLR last month, plenty of support for lightened parts for Stock racing and honestly I've had no complaints running TLR but would love to give the XB2-DE a shot if there was more support for 17.5T Stock parts. I also dropped 24.2g using MIP lightened out drives and shafts, would be nice to see the same option available for the XB2 as well.

The TLR slipper eliminator only dropped 8.6g with that mod, so I would feel that the other lightened parts would be higher priority to get me motivated in buying a XB2-DE + lightened drive line parts support.

Don't really need to make a new spur gear so long as you guys do something similar to what Exotek is doing by making their slipper eliminator compatible with Kimbrough spur gears, or some other popular brand of spur gear manufacturer for touring cars..

Doesn't matter to me if XRay makes the parts or if they coordinate with MIP and Exotek to do what they already have available for TLR.
Why could you possibly need Mip pucks with the xb2? My mod car is in stock form is at 1475grams. I'm waiting on option parts to add weight to the car. The stock drivetrain is incredibly smooth and light. Adding aftermarket parts on this car is a step backwards.
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Old 01-07-2016, 03:06 PM   #908
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Why could you possibly need Mip pucks with the xb2? My mod car is in stock form is at 1475grams. I'm waiting on option parts to add weight to the car. The stock drivetrain is incredibly smooth and light. Adding aftermarket parts on this car is a step backwards.
F=MA

The moment you remove rotating mass, you then gain efficiency. That weight can then be added back in needed places.


As for aftermarket parts being backwards; you have users putting OEM parts from other brands on the car just to make it "work". Sorry, but once you do that, the designer has failed in either designing or market research, or perhaps both.
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Old 01-07-2016, 03:19 PM   #909
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Quote:
Originally Posted by Socket View Post
F=MA

The moment you remove rotating mass, you then gain efficiency. That weight can then be added back in needed places.


As for aftermarket parts being backwards; you have users putting OEM parts from other brands on the car just to make it "work". Sorry, but once you do that, the designer has failed in either designing or market research, or perhaps both.
I have a hard time believing the pucks are going to be lighter over the gear diff. What other oem parts are you talking about. The only thing I have seen others use is the 69/72 spur. Over seas the stock class is nothing. Big whoop..
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Old 01-07-2016, 03:24 PM   #910
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It would be interesting to see the weights of the stock Xray gear and ball diffs, as compared to a comparable MIP diff from say a B5 or a 22-3.0.
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Old 01-07-2016, 04:32 PM   #911
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It would be interesting to see the weights of the stock Xray gear and ball diffs, as compared to a comparable MIP diff from say a B5 or a 22-3.0.
Here's some pics from my TLR 22-3.0 build, I'd be very interested to see what the measurements are for each comparable XB2 part so we we're comparing apples to apples:

Stock Ball diff in the kit = 32.5g


Stock Gear diff from XXX series which is forward compatible with the 22 series = 36.2g


MIP Lightened Ball Diff = 17.2g


Stock Slipper pad parts = 12.4g


Exotek Slipper Eliminator Upgrade = 3.8g


Stock CVD's = 24.9g


MIP Puck CVD's = 17.8g


Obviously weight doesn't matter for open mod cars, but anyone who has raced a stock class with stock parts and then switched to lightened parts will see a significant difference in performance with shorter ramp ups to clear jumps allowing tighter lines, faster acceleration and faster top speed.

*** UPDATE

Stock steel screws on slipper eliminator = 1.3g


Upgraded titanium screws = 0.7g
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Old 01-07-2016, 05:07 PM   #912
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Quote:
Originally Posted by suby723 View Post
Why could you possibly need Mip pucks with the xb2? My mod car is in stock form is at 1475grams. I'm waiting on option parts to add weight to the car. The stock drivetrain is incredibly smooth and light. Adding aftermarket parts on this car is a step backwards.
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Old 01-08-2016, 05:55 AM   #913
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Xray will make sure the dirt version is competitive. The drivetrain is solid and as good as it gets. Some reasonable gearing and we'll be set.

You still have to drive it.
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Old 01-08-2016, 06:09 AM   #914
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Quote:
Originally Posted by Socket View Post
F=MA

The moment you remove rotating mass, you then gain efficiency. That weight can then be added back in needed places.


As for aftermarket parts being backwards; you have users putting OEM parts from other brands on the car just to make it "work". Sorry, but once you do that, the designer has failed in either designing or market research, or perhaps both.
1/2MR^2 is what you're looking for. F=MA just says you need a light car to go fast (at least in a straight line).

The moment of inertia is dependent on the distance the center of the mass is located from the center of rotation, in fact the distance is squared in the equation. So things like a heavy spur to a light spur will make a big difference while a heavy drive shaft to a light driveshaft will make very little difference.
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Old 01-08-2016, 08:17 AM   #915
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What's the MAP for the Dirt edition?
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