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Old 08-30-2016, 11:11 AM   #11296
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Originally Posted by punkracer24 View Post
use a TLR front 4wd wheel nut. It's a lot lower profile than any others.
These are exactly what I use, much thinner than the XRay nuts I have (although I don't think I have any of the newer XRay nuts).
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Old 08-31-2016, 06:32 AM   #11297
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hey guys. i just picked up an xb 2016 and have a question regarding the center diff. Coming from a D413, i would run 100k on a high bite wet clay track and 60k on a med hard packed dirt track. I have been reading on the forums and some of you are using 500k to 1 million. can someone please elaborate on why you are using such center diff oils?
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Old 08-31-2016, 07:08 AM   #11298
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hey guys. i just picked up an xb 2016 and have a question regarding the center diff. Coming from a D413, i would run 100k on a high bite wet clay track and 60k on a med hard packed dirt track. I have been reading on the forums and some of you are using 500k to 1 million. can someone please elaborate on why you are using such center diff oils?
I believe it's been said that its to do with the size of the teeth on the gears in the diff, the XRAY's are smaller, so you need thicker oil to achieve the same results as thinner oil, with bigger teeth.
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Old 08-31-2016, 07:24 AM   #11299
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hey guys. i just picked up an xb 2016 and have a question regarding the center diff. Coming from a D413, i would run 100k on a high bite wet clay track and 60k on a med hard packed dirt track. I have been reading on the forums and some of you are using 500k to 1 million. can someone please elaborate on why you are using such center diff oils?
i already did a few pages back. it's because the way the geometry and bias of the car is it likes to be balanced as far as power delivery goes. it doesn't like to have power rocking it back and forth, it just handles more stable, has better traction, and over all handling with a much thicker center diff fluid. 500k is a good start on anything med-high bite clay.
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Old 08-31-2016, 07:48 AM   #11300
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Originally Posted by skyline1015 View Post
hey guys. i just picked up an xb 2016 and have a question regarding the center diff. Coming from a D413, i would run 100k on a high bite wet clay track and 60k on a med hard packed dirt track. I have been reading on the forums and some of you are using 500k to 1 million. can someone please elaborate on why you are using such center diff oils?
I also wondered about this.. Running on low medium clay using pins. Running 100k and finding it okay. First time running centre diff.. And will switch to the slipper next time to give it a back to back try.

Lyons - since running 100k I find the Xb4 has more drag (nearly all bearings are new) than my previous 4wd buggy that ran slipper. Though maybe my mesh is a bit tight... Straight line top speed seems okay though. With low medium clay should I look at 300-500k oil?
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Old 08-31-2016, 02:57 PM   #11301
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Running med bite ..not clay i run 500k but might try 300k this fall series.. 100k gotsoft feeling after 4 minutes..
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Old 08-31-2016, 07:44 PM   #11302
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How do you guys keep your motors as cool as possible on the XB4?
my buddy morgan makes a sweet flush mount
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Old 08-31-2016, 07:50 PM   #11303
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I run anywhere from 100k to 500k in the center diff but most of the time its 200k or 300k, sometimes ill run 500k is the track is calling a tire like slicks but for dirtwebs or ions/electrons i am around 300k. then for dirt ill run 200k or even 100k if its really loose outdoor. I did find that of course the lower you go the easier the car is to drive, the only issue is your fast laps will be down time wise I try to find a good middle ground, easy to drive but able to run fast enough laps to keep up.
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Old 08-31-2016, 10:31 PM   #11304
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When you run a thinner oil in terms of the centre, I assume there's more slip hence the feeling of soft where I assume with a thicker/locked feeling, the power is more like an ON/OFF switch?
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Old 09-01-2016, 03:00 PM   #11305
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DJ - it should give the feeling of more traction but thickness in center diff fluid, to me at least, is about power distribution.

A thinner center diff fluid will send more power to the unloaded part of the car where thicker fluid is a more even front/rear power distribution.
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Old 09-02-2016, 05:37 AM   #11306
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I just bought a 2015 from a friend and I can't find a body for it. Do the 16 bodies fit the 15?
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Old 09-02-2016, 05:39 AM   #11307
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Nevermind I found the thread about it haha thanks guys
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Old 09-02-2016, 06:43 AM   #11308
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DJ - it should give the feeling of more traction but thickness in center diff fluid, to me at least, is about power distribution.

A thinner center diff fluid will send more power to the unloaded part of the car where thicker fluid is a more even front/rear power distribution.
exactly. this is why i was explaining before, these cars like to be balanced. they don't handle well shifting weight, nor power back and forth. the thicker fluid allows the power ro remain balanced for the most part, but when it does shift it's much more smooth and gradual, it really makes for a faster car. it might feel a tad harder to drive at first, but once you get used to it, it's on rails.
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Old 09-02-2016, 08:05 PM   #11309
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are you guys running the motor forward or rearward on a hard packed med bite?
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Old 09-03-2016, 06:33 PM   #11310
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Originally Posted by skyline1015 View Post
hey guys. i just picked up an xb 2016 and have a question regarding the center diff. Coming from a D413, i would run 100k on a high bite wet clay track and 60k on a med hard packed dirt track. I have been reading on the forums and some of you are using 500k to 1 million. can someone please elaborate on why you are using such center diff oils?
Several guys I know run as low as 10-20k on outdoor dirt. They know a whole lot more than me, so I have tried as well. Skimming through this thread I don't see anyone mention center diff oil this low. Again these guys are a ton smarter than me and I am fairly new to the Xray world. Anyone have input on center diff oils this low? Thanks.
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