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Old 12-26-2016, 07:51 PM   -   Wikipost
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 04-13-2016, 10:31 AM   #2626
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Yes the replacement will be the same for now. it wont change until enough people have had the problem and complained about it that they actually look into it. I think it will help having those pictures of the brace bent before it breaks as well.

It took a few months and a lot of us emailing RCAmerica and Xray about the offset hanger problem on the XB4 before they actually did anything about it.

I think it will help in the meantime to at least put a longer screw in so the threads come out the top of the hanger, and possibly a washer and nut on top.
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Old 04-13-2016, 10:38 AM   #2627
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Quote:
Originally Posted by Socket View Post
A buddy emailed them, and they're going to replace it.
I would even be fine with them not replacing the part if they would simply acknowledge there might be a problem. I'm no mechanical engineer, and even I can tell this design is flawed. Take a look at the rear hanger of an Associated car; its well protected, and not hanging below the chassis desperately asking to be broken.

Quote:
Originally Posted by JAE View Post
Does this mean the replacement part is going to be of the same quality? So, replace every time this happens, or are they going to make a new hanger that all must just purchase?
Great questions. I'm guessing their answer would be "we didn't experience any problems in our testing".

I wish I could tell clients that when they call with bugs in my software. "Sorry, didn't experience that in my testing, thus its impossible for you to be having undue problems".
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Old 04-13-2016, 10:40 AM   #2628
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Half mil shim under the rear block should be more than sufficient to make sure the chassis hits the ground first. I have sone fiberglass shims made by rsd under mine currently. I'm sure he could be convinced to make some specifically for the xb2 if the interest is there.
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Old 04-13-2016, 10:43 AM   #2629
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Quote:
Originally Posted by B00t13g View Post
Half mil shim under the rear block should be more than sufficient to make sure the chassis hits the ground first. I have sone fiberglass shims made by rsd under mine currently. I'm sure he could be convinced to make some specifically for the xb2 if the interest is there.
The best situation would be to shim both the front and rear blocks, this way it's an even roll adjustment that could be counter acted by changing the camber link.
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Old 04-13-2016, 10:49 AM   #2630
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Quote:
Originally Posted by Socket View Post
The best situation would be to shim both the front and rear blocks, this way it's an even roll adjustment that could be counter acted by changing the camber link.
I agree, however I wanted to remove anti squat anyway.
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Old 04-13-2016, 11:06 AM   #2631
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Quote:
Originally Posted by B00t13g View Post
I agree, however I wanted to remove anti squat anyway.
Makes sense, that will certainly do it!

Going to talk to a local machine shop that has a 5 axis scanner and see what'd it cost to do a run of these hangers in a much stronger material.
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Old 04-13-2016, 11:11 AM   #2632
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Quote:
Originally Posted by Socket View Post
Makes sense, that will certainly do it!

Going to talk to a local machine shop that has a 5 axis scanner and see what'd it cost to do a run of these hangers in a much stronger material.
My only concern with that is what's the next weakest link? Chassis?
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Old 04-13-2016, 11:16 AM   #2633
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Quote:
Originally Posted by B00t13g View Post
My only concern with that is what's the next weakest link? Chassis?
I don't think it's the chassis. And from what I see, the impacts breaking and bending this piece are only doing so because it touches the ground on landings.

A strong material I don't think would transfer the stress to the chassis.
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Old 04-13-2016, 11:25 AM   #2634
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BTW....to anyone that doesn't have a backup..a new one from Amain (not in stock...) is $30. There's a popular website for auctions that sells both rear arm mounts, inserts, hinge pins, and front arm mount for $40 shipped...

hint hint.
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Old 04-13-2016, 12:14 PM   #2635
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Im thinking of getting another car to run mod. How does the Carpet Edition do on med grip clay?
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Old 04-13-2016, 01:56 PM   #2636
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Purchased - I'm hoping I'm a lucky one and won't need this. But, I know all hinge pins bend at some point if an arm ever breaks...

Quote:
Originally Posted by Socket View Post
I don't think it's the chassis. And from what I see, the impacts breaking and bending this piece are only doing so because it touches the ground on landings.

A strong material I don't think would transfer the stress to the chassis.
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Old 04-13-2016, 01:58 PM   #2637
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Not good
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Old 04-13-2016, 02:06 PM   #2638
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I'm nearly complete on my XB2 CE and I'm curious how everyone feels on the lack of gear cover? Good/Bad? I can see positive aspects such as less weight, and less to deal with during maintenance. I wonder if the gears rub on the body from time to time though, especially when the car ends on it's lid for example. I makes sense on carpet, no dirt to worry about...and definitely shouldn't be any rocks! haha.

Does the DE come with a gearcover?

Thanks!
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Old 04-13-2016, 02:15 PM   #2639
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The OEM piece must be made out of 6061...If you're interested in purchasing one out of 7075, PM me and give me a heads up. I want to gather a list to give to exotek to prove there's a need.
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Old 04-13-2016, 02:22 PM   #2640
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Quote:
Originally Posted by 13Maschine View Post
I'm nearly complete on my XB2 CE and I'm curious how everyone feels on the lack of gear cover? Good/Bad? I can see positive aspects such as less weight, and less to deal with during maintenance. I wonder if the gears rub on the body from time to time though, especially when the car ends on it's lid for example. I makes sense on carpet, no dirt to worry about...and definitely shouldn't be any rocks! haha.

Does the DE come with a gearcover?

Thanks!
The DE does come with a gear cover.
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