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Old 01-03-2015, 08:26 AM   #6256
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Can someone do a better explanation on the Roll Center with Eccentric Bushings.

I have read the Hudy and Xray setup book guide. The arm mount adjusters (Bushings) still eludes me. I see plenty of description for the upper link with length and mounting height.

Now the 15 has a higher rear mount, instead of the normal one.
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Old 01-03-2015, 08:39 AM   #6257
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The higher roll center mounts are to compensate for the plastic spacer not being under the rear diff. The mounts keep the arms in the same position as the '14 mounts with the spacer.
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Old 01-03-2015, 08:44 AM   #6258
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My xb4 15 should arrive middle of next week. I'm trying to decide if I want to go saddle or shorty. I plan on running the center diff and my local track is indoor dirt/clay medium amounts of traction.
I have seen a few posts that the saddles can be better and kind of smooth things out. But I would prefer to run shorty.

I would appreciate some input.
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Old 01-03-2015, 08:58 AM   #6259
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Quote:
Originally Posted by jmcelroy42 View Post
The higher roll center mounts are to compensate for the plastic spacer not being under the rear diff. The mounts keep the arms in the same position as the '14 mounts with the spacer.
Mounting the pins higher, gives a higher roll center?
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Old 01-03-2015, 09:06 AM   #6260
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Anyone with a new center diff try and drop it into the 14? I know the Xray site lists it as compatible, but others believe it won't fit without some extra mods. Just looking for a solid answer as I'll likely try to put one in my 14 if it will work for reasonable cost / modifying.
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Old 01-03-2015, 09:28 AM   #6261
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Quote:
Originally Posted by MaricopaAgent View Post
Mounting the pins higher, gives a higher roll center?
No, mounting the pins higher gives a lower roll centre.

I have read a bunch as well and my head hurt half way through it. I just go with Martin Bayer's bushing set ups. He seems to run fairly consistent set ups for his surfaces. His bushings change very little from clay to clay tracks, and for carpet it's different of course, but again, carpet to carpet, very little changes. I try not to overthink or confuse myself, just set it and drive!

I'm on the fence about updating my '13 which is not really far from being a '14, with the +2 rear suspension hangers. The team guys seem to run the +2's in the same position as the originals anyhow, so,what's the real benefit?
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Old 01-03-2015, 09:46 AM   #6262
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Quote:
Originally Posted by HeavyD99 View Post
No, mounting the pins higher gives a lower roll centre.

I know this is confusing but I believe you are incorrect, mounting the pins higher will give a higher RC, but mounting the inside end of the link higher will give a lower RC.
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Old 01-03-2015, 11:07 AM   #6263
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Quote:
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I know this is confusing but I believe you are incorrect, mounting the pins higher will give a higher RC, but mounting the inside end of the link higher will give a lower RC.
Then we agree, as the question being asked is about the inner hinge pins and the eccentric bushings....
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Old 01-03-2015, 11:40 AM   #6264
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Mine arrived today as well. Got it built,Gonna try it tomorrow, gotta round up some heavy fluids. Gonna try 80k-100k

let me know how 80,000 and 100,000k work for you. because the center diff calls for 1,000,000 carpet and 500,000 for clay. seems like 80k to 100k is way off there range.
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Old 01-03-2015, 09:43 PM   #6265
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Does anyone run any sort of grease, diff lube, or anything on the steel gears? Or just run them dry?
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Old 01-03-2015, 10:16 PM   #6266
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dry in the front a touch of black grease in the rear.
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Old 01-03-2015, 10:22 PM   #6267
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Originally Posted by DustinEich View Post
dry in the front a touch of black grease in the rear.
I would imagine it helps save the gears? Makes them last longer?
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Old 01-03-2015, 10:25 PM   #6268
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I have xray xb4 '15 center differential but i want to sell. Let me know if anyone interested pm me for quick response i will text the picture.
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Old 01-04-2015, 12:20 AM   #6269
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Quote:
Originally Posted by raved007 View Post
I have xray xb4 '15 center differential but i want to sell. Let me know if anyone interested pm me for quick response i will text the picture.
Pm sent
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Old 01-04-2015, 02:15 AM   #6270
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who has the center diffs instock, I'd like to try it out..

I tried the shorty pack stock setup, I really like it on a clay track. the rear end seems to be very light and turns on a dime! I have yet to go back to saddles with the 2015, but still experimenting. Does anyone have a good clay setup? saddles or shorty?
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