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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 12-29-2015, 04:05 PM   #796
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Quote:
Originally Posted by dgrobe2112 View Post
has anyone come up with gearing for 17.5 motor for this car yet? im assuming 75 spur. where would that put me pinion size?
36 75 with a R1 wurks v7 motor on a high bite astroturf track 85 foot straight
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Old 12-29-2015, 09:31 PM   #797
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Just drill them out, you can buy a drill piston set for under $10 and takes less than 5 minutes.
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Old 12-30-2015, 05:12 AM   #798
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Finished my build today, went together really well! here are some pics comparing it to my older XB4 2WD

also thanks for the tips with the steering blocks, i almost put them in the wrong way before checking them!















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Old 12-30-2015, 08:50 AM   #799
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Just drill them out, you can buy a drill piston set for under $10 and takes less than 5 minutes.
Done.
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Old 12-30-2015, 04:16 PM   #800
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What AE pistons do you guys use ? I tried the stock ones that come with the b5m (1.5mm,1.6mm and 1.7mm) and I do remark that they are not the same diameter as the xrays.
The xray's are 12.00mm spot on whereas the AE's are 11.80mm.
When I tried them two problem arose:
- The thickness wasn't the same I had to sand off the AE's to fit.
- And secondly I have found that the AE pistons had an awful lot of radial play hence why I measured them.
0.2mm on diameter is substantial, that's 3.73mm˛ difference ! A 1.6x2 hole piston give 4.02mm˛ in perspective !
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Old 12-30-2015, 04:23 PM   #801
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Quote:
Originally Posted by shannow View Post
What AE pistons do you guys use ? I tried the stock ones that come with the b5m (1.5mm,1.6mm and 1.7mm) and I do remark that they are not the same diameter as the xrays.
The xray's are 12.00mm spot on whereas the AE's are 11.80mm.
When I tried them two problem arose:
- The thickness wasn't the same I had to sand off the AE's to fit.
- And secondly I have found that the AE pistons had an awful lot of radial play hence why I measured them.
0.2mm on diameter is substantial, that's 3.73mm˛ difference ! A 1.6x2 hole piston give 4.02mm˛ in perspective !
Nobody uses AE, Yokomo or Losi pistons in the Xray shocks as they do not fit.

Which you obviously found out for yourself as well

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Old 12-30-2015, 04:24 PM   #802
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Nobody uses ae pistons. Drill out the blank Pistons included in the kit.

Edit: Bent beat me to it.. Replied quicker haha
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Old 12-30-2015, 04:33 PM   #803
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Thanks I can't remember where I read or heard this but at some point I was told so.

I think it could be one of my mates at the club who told me this which could explain why his xb2 didn't behave so well and he was a bit upset the last evening meeting.
The car was a bit all over the place and wouldn't hook to the carpet even with brand new mini pins.
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Old 12-30-2015, 11:03 PM   #804
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Quote:
Originally Posted by BentKa View Post
Nobody uses AE, Yokomo or Losi pistons in the Xray shocks as they do not fit.

Which you obviously found out for yourself as well

Bent
Avid makes pistons for the xray.
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Old 12-31-2015, 12:05 AM   #805
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Quote:
Originally Posted by Wildcat1971 View Post
Avid makes pistons for the xray.
I know.....Schelle and TWorks makes them as well.

But that was not the point.

He was trying to run AE pistons on recommendation from another user......which do not fit

Bent
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Old 12-31-2015, 08:09 AM   #806
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Bent,

Looking to try out these tires. We run carpet at out track here in the States, but it doesn't have nearly the traction compared to the surfaces you run on.

http://www.racing-cars.com/pp/New_Ca...SV2/U6759.html

As these aren't low profile (higher sidewall), do you run these without inserts also?

Schumacher claims that typically you don't, curios as to what others have discovered.
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Old 12-31-2015, 08:41 AM   #807
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Quote:
Originally Posted by celt View Post
Bent,

Looking to try out these tires. We run carpet at out track here in the States, but it doesn't have nearly the traction compared to the surfaces you run on.

http://www.racing-cars.com/pp/New_Ca...SV2/U6759.html

As these aren't low profile (higher sidewall), do you run these without inserts also?

Schumacher claims that typically you don't, curios as to what others have discovered.
Yep.....Stagger tires we always run without inserts.....Low Profile or not

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Old 12-31-2015, 09:04 AM   #808
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Ok is it right for these shocks to have alot of droop?

I built it per kit, and 30.5 stroke rear, and 24 front.

Also to go along with my question; does it seem right that I would have to run such a stiff spring to make it not donky kick?
Local track: https://scontent.fsnc1-1.fna.fbcdn.n...7d&oe=56FE73E3

I'm running 18 ride height with, stock front spring and yellow associated rear spring.
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Old 12-31-2015, 09:10 AM   #809
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Ok is it right for these shocks to have alot of droop?

I built it per kit, and 30.5 stroke rear, and 24 front.
Stroke of the shocks are the same as we've had on the XB4 since day one.

The geometry of the XB2 allows the use of quite a bit of droop when shocks are run without limiters inside.

If you want less droop just add limiters inside the shocks

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Old 12-31-2015, 09:17 AM   #810
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Quote:
Originally Posted by 3srcracing View Post
Ok is it right for these shocks to have alot of droop?

I built it per kit, and 30.5 stroke rear, and 24 front.

Also to go along with my question; does it seem right that I would have to run such a stiff spring to make it not donky kick?
Local track: https://scontent.fsnc1-1.fna.fbcdn.n...7d&oe=56FE73E3

I'm running 18 ride height with, stock front spring and yellow associated rear spring.
No, we run 1 dot rear spring indoors with 16mm ride height and 50 g under LiPo as added weight. We however run 2x1.7 pistons with 400 cst oil.

Outdoors we always run the 1 dot rear spring as well even with as much as 120 g of weight added. Same piston and 400-450 cst oil.

Bent
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