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Old 12-26-2016, 07:51 PM   -   Wikipost
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 03-15-2016, 06:57 PM   #1966
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Did you put 4 or 2 screws in the waterfall? Manual I believe stated only run 2. This is a tuning option. 2 inside vs 2 outside vs all 4. If you have 4 screws in it, you should have the stiffest setting you can run for flex there.
Ah ok that makes sense.
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Old 03-15-2016, 07:56 PM   #1967
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Default 64 pitch

17.5 guys why not just run 64 pitch with exotek slipper delete. 92 to 102 spur. And 40 to 46 pinion
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Old 03-15-2016, 08:17 PM   #1968
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new build
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Old 03-15-2016, 08:46 PM   #1969
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17.5 guys why not just run 64 pitch with exotek slipper delete. 92 to 102 spur. And 40 to 46 pinion
Because we run schelle slippers to be able to change between locked and slipper with just a plate. I myself find the car more consistent with a tight red/red/white slipper setup. This gives relief on the jumps and under hard braking in the turns instead of locking up tires causing the rear end to get upset. Also a lot are already running 64 pitch on the stock cars
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Old 03-15-2016, 10:12 PM   #1970
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I got to see a CE run tonight on my local clay track. IT was really good. Did have a ball diff in it. It handled really well though.
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Old 03-16-2016, 12:39 AM   #1971
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On the relative merits of different pinion/spur combinations....the driving effect is the change in polar moment of inertia. If the FDR's are identical, a setup with smaller/lighter gears will have less moment of inertia, and less resultant rotational momentum. So it will spin up faster and slow down faster with a fixed amount of power.

This is why we see "cut gears" and the like. The loads applied during offroad racing seems to put a practical limit on the toughness of the geartrain though. I see some onroad cars have more exotic and lighter gear setups.

PS- The other factor with cut gears is the reduction in friction due to smaller contact areas between the gears.

Last edited by avaldes; 03-16-2016 at 07:57 AM.
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Old 03-16-2016, 09:16 AM   #1972
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Just A heads up my diff ring was slipping on one outdrive so put a drop of CA on each ring
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Old 03-16-2016, 09:57 AM   #1973
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17.5 guys why not just run 64 pitch with exotek slipper delete. 92 to 102 spur. And 40 to 46 pinion
Does Xray produce these parts?
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Old 03-16-2016, 12:48 PM   #1974
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Does Xray produce these parts?
No. If they do most likely for on road cars. They have off set Spurs. The exotek slipper eliminator. You can put on a standard old school spur gear. Old school I mean one you can build a old pan car diff with.
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Old 03-16-2016, 03:42 PM   #1975
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Quote:
Originally Posted by WillS View Post
Because we run schelle slippers to be able to change between locked and slipper with just a plate. I myself find the car more consistent with a tight red/red/white slipper setup. This gives relief on the jumps and under hard braking in the turns instead of locking up tires causing the rear end to get upset. Also a lot are already running 64 pitch on the stock cars
Are you running a schelle slipper on the Xray XB2???
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Old 03-16-2016, 04:40 PM   #1976
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what is the advantage of running 64 pitch gears?
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Old 03-16-2016, 04:45 PM   #1977
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what is the advantage of running 64 pitch gears?
Finer control of gear ratios. Think of it as being able to go up half a tooth.
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Old 03-16-2016, 05:02 PM   #1978
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Originally Posted by 13Maschine View Post
Are you running a schelle slipper on the Xray XB2???
As soon as I get time with my lathe and mill I will be
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Old 03-16-2016, 05:03 PM   #1979
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As soon as I get time with my lathe and mill I will be
Will, you going to do one for me as well?

Haha
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Old 03-16-2016, 05:14 PM   #1980
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Finer control of gear ratios. Think of it as being able to go up half a tooth.
yup thats close enough to explain lol here is an example at the fine tuning 64 pitch allows.

72 spur 48 pitch / 96 spur 64 pitch
30 - 6.36 / 6.36 - 40
31 - 6.15 / 6.20 - 41
32 - 5.96 / 6.06 - 42
33 - 5.78 / 5.92 - 43
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