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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 04-17-2016, 10:25 AM   #2716
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The DE on our clay track was as good.. Then better than the CE on the same track. Same layout.. With slick tires.. Stock setup on the DE.. My lap times were just as fast as my CE setup.. A couple changes to shock pistons.. And oils.. And using AE springs.. I gained almost a half second.. And run my fastest laps on the track. I am much happier with the DE conversion..
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Old 04-17-2016, 02:19 PM   #2717
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Quote:
Originally Posted by dgrobe2112 View Post
The DE on our clay track was as good.. Then better than the CE on the same track. Same layout.. With slick tires.. Stock setup on the DE.. My lap times were just as fast as my CE setup.. A couple changes to shock pistons.. And oils.. And using AE springs.. I gained almost a half second.. And run my fastest laps on the track. I am much happier with the DE conversion..
Interesting. I don't really have much to add after running the dirt edition, it wasn't worse by any means. Still battling traction rolls. Any chance you have an updated setup sheet for the de?
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Old 04-17-2016, 02:24 PM   #2718
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Also, what did you do about a fan?
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Old 04-17-2016, 06:56 PM   #2719
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I'm not running a fan. I will update my setup sheet.. One thing I did was move the upper rear shock to the inner hole.. And it helped with my traction roll..
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Old 04-17-2016, 06:59 PM   #2720
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I'm not running a fan. I will update my setup sheet.. One thing I did was move the upper rear shock to the inner hole.. And it helped with my traction roll..
Great info, thank you!
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Old 04-17-2016, 07:30 PM   #2721
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2 questions;

Does the DE come as a laydown car, and what are you guys at for weight with box stock kits and standard 200~ gram shorty?
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Old 04-17-2016, 07:45 PM   #2722
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2 questions;

Does the DE come as a laydown car, and what are you guys at for weight with box stock kits and standard 200~ gram shorty?
DE comes as the stand up 3 gear car, like the B5M lite car.

Weight, with a regular sized shorty, and NOTHING for weight reduction, I was at 1550.
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Old 04-17-2016, 07:48 PM   #2723
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Quote:
Originally Posted by Socket View Post
DE comes as the stand up 3 gear car, like the B5M lite car.

Weight, with a regular sized shorty, and NOTHING for weight reduction, I was at 1550.
Do you run the ce or de?
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Old 04-17-2016, 08:29 PM   #2724
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Quote:
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Do you run the ce or de?
I run the DE.

The CE car is the laydown 4 gear car.

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Old 04-17-2016, 09:03 PM   #2725
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I'm at a point where it seems as though the factor (car wise) between the guys who are running consistent mid 26's and me running consistent low 27's is they are laydown cars. I could probably afford to lose a few more grams, but I'm on the fence between buying humptys laydown or going to an xb2. You've driven both, is it a faster car than a 3 gear b5m?
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Old 04-17-2016, 09:15 PM   #2726
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Quote:
Originally Posted by AZJP View Post
I'm at a point where it seems as though the factor (car wise) between the guys who are running consistent mid 26's and me running consistent low 27's is they are laydown cars. I could probably afford to lose a few more grams, but I'm on the fence between buying humptys laydown or going to an xb2. You've driven both, is it a faster car than a 3 gear b5m?
My opinion isn't going to be your favorite. But at that track, in that class, I'd tell you to either figure something out setup wise or driving to get to that lap time...or buy the wwhd laydown.

Wheeler has proven you don't need a laydown car to go that fast in 17.5...Does that mean the XB2 Dirt could do it? Sure, but the laydown B5M's are SUPER easy to drive consistently fast.

Tito just won JBRL at SDRC with a laydown B5M - that car is sick when traction is up. The moment it drops, it's a fish out of water from my understanding.

You have a new track coming in 3 months - and I have a feeling a laydown car won't be optimal there, but now I am just guessing.

If it were me, in your shoes, I'd go wwhd B5M over the DE. The DE is going to be more of the same to you.

Gonzales runs the Carpet car at SRS, and he seems to go pretty quick with it, but you are pushed to a 4 gear laydown.
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Old 04-17-2016, 09:36 PM   #2727
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Quote:
Originally Posted by Socket View Post
My opinion isn't going to be your favorite. But at that track, in that class, I'd tell you to either figure something out setup wise or driving to get to that lap time...or buy the wwhd laydown.

Wheeler has proven you don't need a laydown car to go that fast in 17.5...Does that mean the XB2 Dirt could do it? Sure, but the laydown B5M's are SUPER easy to drive consistently fast.

Tito just won JBRL at SDRC with a laydown B5M - that car is sick when traction is up. The moment it drops, it's a fish out of water from my understanding.

You have a new track coming in 3 months - and I have a feeling a laydown car won't be optimal there, but now I am just guessing.

If it were me, in your shoes, I'd go wwhd B5M over the DE. The DE is going to be more of the same to you.

Gonzales runs the Carpet car at SRS, and he seems to go pretty quick with it, but you are pushed to a 4 gear laydown.

I think the next layout will be more open and high speed, which I think a laydown car will shine there. Who knows. Wish we had more insight on an AE laydown cars ETA.

Have you driven the laydown xb2 with the 4 gear? How does it compare to your DE?
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Old 04-17-2016, 10:42 PM   #2728
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I think the next layout will be more open and high speed, which I think a laydown car will shine there. Who knows. Wish we had more insight on an AE laydown cars ETA.

Have you driven the laydown xb2 with the 4 gear? How does it compare to your DE?
I haven't.

You coming down south this weekend for the states race?
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Old 04-17-2016, 11:53 PM   #2729
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More droop?

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Old 04-18-2016, 06:30 AM   #2730
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I haven't.

You coming down south this weekend for the states race?
I might.
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