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Old 03-05-2019, 10:29 AM
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For those running 13.5 in the XB4 are you using the composite Ring & Pinion gears and if so what differences have you noticed if any, other than weight difference.
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Old 03-06-2019, 03:29 AM
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Originally Posted by snwchris View Post
For those running 13.5 in the XB4 are you using the composite Ring & Pinion gears and if so what differences have you noticed if any, other than weight difference.
Both my daughter and I are running the composite diff parts. The cars are more responsive and get the power down better. There is a massive difference in weight which is also rotational mass within the drive train.
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Old 03-07-2019, 01:34 AM
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Hi, I recently picked up a 2015 XB4 to try some outdoor events but also use it indoors at a local venue with new EOS high grip carpet. With the stock 45/60mm springs I can't get it below 17mm. I could buy the new 42/57 ones to lower it a bit further but could I use different lower spring cups which will be cheaper? I have seen the odd post online of people using Associated ones however all the info I can find says that AE (and others) use "12mm big bore springs" but my XB4 ones measure 15.5mm ID so I'm confused!

Basically looking at something like this to lower it down https://rccarshop.co.uk/accessories/...-spring-cups-p

thanks
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Old 03-07-2019, 12:39 PM
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When I ran carpet with my 16 XB4 I was told by many Xray guys and even Bent K himself to cut 1 coil off the standard length springs to achieve the lower ride height needed.
You can try searching thru this thread for Bent's info or posts and might be able to see as well.
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Old 03-08-2019, 12:13 AM
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Hi, yes I saw those posts and might end up doing that but thought if I can get some shorter lower cup cheaply then I keep the springs at their intended length.
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Old 03-11-2019, 07:27 AM
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Picked up an used xb4 '17. Is the servo horn too long? With the stock plastic servo horn, I have to limit my servo travel on both side to 70%.
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Old 03-11-2019, 08:56 AM
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if you're getting full steering throw, then that's fine.
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Old 03-11-2019, 06:11 PM
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I am getting full steering throw but because I'm dialing back my EPA to 70%, I'm loosing resolution. A shorter servo arm with EPA set close to 100% would give better resolution. Wonder if anyone tried that. I'm sure I can run as is, it's not a deal breaker.
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Old 03-12-2019, 05:20 PM
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Originally Posted by snwchris View Post
When I ran carpet with my 16 XB4 I was told by many Xray guys and even Bent K himself to cut 1 coil off the standard length springs to achieve the lower ride height needed.
You can try searching thru this thread for Bent's info or posts and might be able to see as well.
You know of course that cutting a coil off increases the spring rate.... 10 coils, cut one off, increase rate 10%...
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Old 03-13-2019, 10:26 AM
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Yep, but it flat out works better though. I was told my Malin and Bent karlsen to cut the coil for carpet racing and is what most of the guys were doing and still use.
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Old 03-27-2019, 03:57 AM
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Hey, I'm new to xray and I wanted to ask what does the composite diff outer gears, how they hold up. I'm going to run in mod on low grip, bumpy dusty track and next winter on carpet in stock. But I want to know how they hold the wear in mod class and what difference it makes compared to steel ones.
​​​​​And what about center diff, should I try slipper first, or its a must for low grip track?
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Old 03-27-2019, 10:16 AM
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I prefer the center diff over the slipper for tuning IMO.
As for the Composite outer gears, do you mean the Ring & Pinion gears.... if so I would keep them steel for Mod class.
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Old 04-08-2019, 06:54 PM
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Anyone happen to a spur loose and could measure inside diameter of hole. Looking for a spur with 8mm hole to use on another application.
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Old 04-18-2019, 09:43 AM
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I'm getting my XB4 '19 next week and I need some advice.

​​​​​​There is a outdoor track near me being built and should be finished soon and the material is going to be dirt.

I suspect the surface is going to be a little bit soft and maybe slippery since it's spring here in Sweden and it' s not going to be at it's best in a while.

Nothing like the tracks I watch on youtube from the big races 🤣.

Since I'm new to this modell I'm wondering when I should use a geardiff instead of standard?

I got both to use so please educate me.

What should I look for in a track to decide?

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Old 04-18-2019, 11:02 AM
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I like the center diff for dirt especially. I would start around 10k on a loose loamy surface and go up as the traction comes up. Currently my car is 10k front 20k center and 7k rear.
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