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Old 02-13-2019, 07:35 AM
  #13066  
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It feels like the drivetrain moves freely, maybe will check thru some of the bearings and double check to see and be sure.
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Old 02-16-2019, 03:13 AM
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Originally Posted by snwchris View Post
Thanks will try that out.
This past weekend it was temping out at 158* with a fan behind the motor.
That doesn't sound right at all. I run 13.5t at either 78/28 or 78/29 with a fan shroud and even in Australian summer 90-105 degrees Fahrenheit motor temps are 135 - 140 after a 5 minute run.

Sounds like you are running your gear mesh too tight to me? Only say that as I find the xb4 is really sensitive to mesh. I once had mine slightly too tight and my temps went through the roof. It also tightens as you screw it down so it's hard to get right.
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Old 02-16-2019, 11:40 AM
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Does anyone know of someone selling a Xb4 or xb2 de 2019
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Old 02-19-2019, 04:26 PM
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Which is better on clay , Medium bite the Xb4,18 or 19?
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Old 02-20-2019, 07:57 AM
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Both are great on clay but I'd get the '19. Same proven platform with meaningful enhancements to improve reliability and tunability. By default I'd say that the changes to the rear created more grip on that end. The differences that probably had the most impact for me:
  • New hubs with more tuning options (inserts to raise/lower/widen/narrow outboard + new arms to match),
  • 2.5mm drive pins with the 73mm drive shafts,
  • Lighter steel bevel gears (that have minimal wear compared to '18 gears) with a redesigned coupling to the center universals.

Last edited by BryanJ; 02-20-2019 at 07:57 AM. Reason: format
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Old 02-21-2019, 03:02 AM
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Hi everyone, saturday i'm gonna run my xb4 2wd on a dirt track a friend of mine build at his home.
I run on carpet and i want to drive on this track just for a day, for fun.
So, 2wd, trackstar 7.5 combo, 0 grip and carpet setup...any tips? (Don't tell me to stay at home )
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Old 02-22-2019, 04:19 AM
  #13072  
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Originally Posted by BryanJ View Post
Both are great on clay but I'd get the '19. Same proven platform with meaningful enhancements to improve reliability and tunability. By default I'd say that the changes to the rear created more grip on that end. The differences that probably had the most impact for me:
  • New hubs with more tuning options (inserts to raise/lower/widen/narrow outboard + new arms to match),
  • 2.5mm drive pins with the 73mm drive shafts,
  • Lighter steel bevel gears (that have minimal wear compared to '18 gears) with a redesigned coupling to the center universals.
Forgive the ignorant question but what improvement do you notice out of the 2.5mm pins over the 3mm ones? Have to admit I haven't noticed anything at all.
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Old 02-23-2019, 07:56 AM
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Originally Posted by Maraach View Post
Forgive the ignorant question but what improvement do you notice out of the 2.5mm pins over the 3mm ones? Have to admit I haven't noticed anything at all.
Feels like less bind at the outdrive, especially at full droop/compression where the angle relative to the outdrive is greatest. Probably most noticeable on dirt where there is a higher ride height and more total suspension travel and also more noticeable with full blown mod motors where the suspension loads and unloads harder under acceleration and braking. So, in theory, potentially less chance of the drivetrain going from binding to super free very suddenly and breaking loose as the car accelerates out of full squat.

Seem to be wearing better as well, so more consistent performance over their lifetime.
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Old 02-24-2019, 02:43 PM
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Originally Posted by BryanJ View Post
Feels like less bind at the outdrive, especially at full droop/compression where the angle relative to the outdrive is greatest. Probably most noticeable on dirt where there is a higher ride height and more total suspension travel and also more noticeable with full blown mod motors where the suspension loads and unloads harder under acceleration and braking. So, in theory, potentially less chance of the drivetrain going from binding to super free very suddenly and breaking loose as the car accelerates out of full squat.

Seem to be wearing better as well, so more consistent performance over their lifetime.
Thanks for clarifying. I haven't noticed everything you are saying, but I also run stock so I guess that isn't a surprise. I haven't run mine long enough yet to comment on wear (though will concur it wasn't the best on the old pins).
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Old 02-28-2019, 02:42 PM
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quick, maybe dumb question. i just picked up a 2016 xb4..does each year have a different chassis? i was hoping to order another one,but i can't find any 2016 chassis in stock. any insight is appreciated
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Old 02-28-2019, 02:59 PM
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Most years the chassis will carry over. In 2018 the chassis was changed to accommodate the new lower motor mount that came out that year. You're looking for P/N 361104, where the current one is 361105 (comes with the '18 and '19).

Getting harder to find I'd guess but according to their online shop it looks like AbsoluteHobbyz has it in stock, new: https://www.absolutehobbyz.com/XRAY-..._p_508068.html.
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Old 02-28-2019, 03:31 PM
  #13077  
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Default Xb4 wheel sizes own vs jconcepts vs proline

Ok

So this has been asked a number of times without a clear answer so figured I'd spend some time measuring my 2019 xb4 up with different wheels.It is worth noting that according to proline support the standard velocity rears with 0mm offset are what is used by Ty Tessman and they do not recommend running different offsets.

stock 2019 xb4 wheel


jconcepts mono rear for xb4


proline velocity rear (hard to measure due to the way it concaves)


So, from a pure rim width perspective the jconcepts is (unsurprisingly) the widest, followed by the xb4 oem and the proline the narrowest - there isnt much in them though.

So lets check them on the car. For measuring a ride height of 20mm front and rear was used. I am using 2019 stock rims for whatever im not measuring (so when measuring the rears im using 2019 stock rims on the front, when measuring the fronts im using 2019 oem xb4 rims on the back etc.)


Stock oem 2019 rears - measuring 123mm per side (246mm total)


Stock oem 2019 rears - measuring 123mm per side (246mm total)


Jconcepts rear - 121.5mm per side (total 243mm)


Proline rear - 122mm per side (244mm total)
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Last edited by Maraach; 02-28-2019 at 03:53 PM.
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Old 02-28-2019, 03:50 PM
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So. From a purely make same as stock perspective it would appear as though you would need a +1.5mm offset for the jconcepts and a +1mm offset for the prolines

The fronts managed the same (121mm per side) for both the oem xb4 and the proline velocity xb4 rims. So, no different hexes required to compensate.
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Old 02-28-2019, 03:54 PM
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Front rims



Proline xb4


Oem xb4
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Old 02-28-2019, 06:41 PM
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You can use the stick that comes out of the other end of your calipers for offset measurements. Lol. Just lay a straight metal ruler across the wheel.

Then I label my wheels wide or narrow track width. Generally, I just sharpie along my tires on my setup board to get track width.
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