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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 01-31-2017, 09:01 AM   #4471
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Help please...I am loosing traction mid race.....car is super hooked up for the first 2 plus mins and then traction dies off....to the point where the car is undriveable under power
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Old 01-31-2017, 09:04 AM   #4472
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I have designed a 30mm fan mount for the XB2 CE but nobody in my area has one to test it for me. Anyone here interested? I will mail it to you completely free, in the U.S.. I just need some good feedback on it and pics so I can see fit and where I might be able to make it stronger if needed. PM me if interested.
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Old 01-31-2017, 09:55 AM   #4473
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Quote:
Originally Posted by Shaun B22 View Post
Help please...I am loosing traction mid race.....car is super hooked up for the first 2 plus mins and then traction dies off....to the point where the car is undriveable under power
What tires and do you sauce?
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Old 01-31-2017, 12:02 PM   #4474
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Quote:
Originally Posted by dgrobe2112 View Post
Take ur stock wheels and cut the inner bead all the way back to the 2nd middle bead
Ahh, this makes sense.... Thanks!!!
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Old 01-31-2017, 04:22 PM   #4475
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Quote:
Originally Posted by symmetricon View Post
What tires and do you sauce?
prime blues front and back, SXT sauce, 19mm ride height, 8.5...I can't rember what oil or pistons I have in it but I am using X-ray 2 dot front and rear springs.....also not too sure what oil is in the diff.......car was super awesome and super fast.....then last raceday traction dropped off after half a race. I am confused because I haven't made any changes....
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Old 01-31-2017, 04:40 PM   #4476
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I found laying the rear shock down onto the inner hole on the tower made a huge difference in side bite. Then of course all the others... lower roll center, pills facing down, more shims in rear camber link, longer rear link, more toe in, etc.... also, sticky weights under transmission. buggy is usually underweight anyhow
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Old 01-31-2017, 04:41 PM   #4477
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Quote:
Originally Posted by Shaun B22 View Post
prime blues front and back, SXT sauce, 19mm ride height, 8.5...I can't rember what oil or pistons I have in it but I am using X-ray 2 dot front and rear springs.....also not too sure what oil is in the diff.......car was super awesome and super fast.....then last raceday traction dropped off after half a race. I am confused because I haven't made any changes....
How many runs did you have on those tires? Primes fall off really hard when they get just a bit too worn in my experience.
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Old 01-31-2017, 05:14 PM   #4478
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Quote:
Originally Posted by MX304 View Post
How many runs did you have on those tires? Primes fall off really hard when they get just a bit too worn in my experience.
One 5 minute quilifier missed TQ by 2 or 3 tenths

Triple main 1st, 2nd, 2nd....pushing the car hard.

So 4 FAST runs....on Grey CRC carpet

Next race day 1st qual....no traction after 2 or 3 mins.....so I cleaned the tires and re-sauced. The car acted the same for the rest of the day....I was on pace or better for the first half or so then I had to baby the throttle or I would brake loose.
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Old 01-31-2017, 05:15 PM   #4479
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Pictures from the JConcepts chassis focus of Malin's Xray XB2 at the 2017 Reedy International Offroad Race of Champions.
Pictures courtesy of Thomas @ JConcepts.



















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Old 01-31-2017, 06:54 PM   #4480
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Quote:
Originally Posted by Shaun B22 View Post
One 5 minute quilifier missed TQ by 2 or 3 tenths

Triple main 1st, 2nd, 2nd....pushing the car hard.

So 4 FAST runs....on Grey CRC carpet

Next race day 1st qual....no traction after 2 or 3 mins.....so I cleaned the tires and re-sauced. The car acted the same for the rest of the day....I was on pace or better for the first half or so then I had to baby the throttle or I would brake loose.
Disregard my comment on tires. I was thinking about the proline carpet mini pin tires, not slicks. I've never run slicks so I have no idea how they behave.
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Old 01-31-2017, 08:04 PM   #4481
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Proline primes gain grip until they become too soft and have so much grip they traction roll too easily

Quote:
Originally Posted by MX304 View Post
Disregard my comment on tires. I was thinking about the proline carpet mini pin tires, not slicks. I've never run slicks so I have no idea how they behave.
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Old 01-31-2017, 08:07 PM   #4482
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Interesting. Whenever I stood the rear shock up I lost side bite. However, I stood them up by leaving the rear shock on the middle hole on the tower and inner hole on the arm. Buggy's rear end would step out a bit in corners and a little unstable, albeit very aggressive and fast when it hooked up. Never tried that outer hole on the rear tower though. Hmm... interesting

Quote:
Originally Posted by BentKa View Post
Pictures from the JConcepts chassis focus of Malin's Xray XB2 at the 2017 Reedy International Offroad Race of Champions.
Pictures courtesy of Thomas @ JConcepts.



















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Old 02-01-2017, 03:34 AM   #4483
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I just built an XB2 CE '17 kit and had a few questions.

The driveshafts supplied are 67mm and the manual specs 68mm. The driveshaft pin looks dangerously close to coming out of the outdrive at full droop? Is this an update?

Also the included manual specs 400cst oil and 3 hole pistons in the rear shocks and the basic setup sheet for the 17 XB2 on Xray's website shows 350cst oil and 2x1.7 pistons. The kit came with 400cst oil and 2x1.7 pistons. Their online manual shows 400cst and 2x1.7 pistons. I build it with 400cst and 2x1.7. Any advice?
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Old 02-01-2017, 04:10 AM   #4484
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Quote:
Originally Posted by no1tubaplayer View Post
I just built an XB2 CE '17 kit and had a few questions.

The driveshafts supplied are 67mm and the manual specs 68mm. The driveshaft pin looks dangerously close to coming out of the outdrive at full droop? Is this an update?

Also the included manual specs 400cst oil and 3 hole pistons in the rear shocks and the basic setup sheet for the 17 XB2 on Xray's website shows 350cst oil and 2x1.7 pistons. The kit came with 400cst oil and 2x1.7 pistons. Their online manual shows 400cst and 2x1.7 pistons. I build it with 400cst and 2x1.7. Any advice?
67 mm driveshafts are an update that unfortunately didn't make it into the manual.

Our go to setup for the shocks are indeed 2x1.6 / 500 cst front and 2x1.7 / 400 cst rear so you'll be just fine for a start setup

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Old 02-01-2017, 04:17 AM   #4485
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Quote:
Originally Posted by BentKa View Post
67 mm driveshafts are an update that unfortunately didn't make it into the manual.

Our go to setup for the shocks are indeed 2x1.6 / 500 cst front and 2x1.7 / 400 cst rear so you'll be just fine for a start setup

Bent
Excellent, thank you!
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