Xray XB9

Old 05-06-2012, 03:44 AM
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Hi all,
We have 3 XB9's at our local track and they all seem to have the same issue...
The shock shaft guides in the bottom of the shocks where the o ring's are seem to be a bit of a loose fit. When the shocks are built, if you hold the shock body there seems to be a lot of side play when moving the shaft. We have checked and they have been built correctly. When comparing to other shocks like mugen or losi there isn't anywhere near as much play.
Could some of you please see if your cars have the same?
Help with this would be greatly appreciated
Cheers Andy
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Old 05-06-2012, 05:34 AM
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Is more the fit of the piston than the orings/guides. If you use a piston with a larger diameter and that is a better fit in the body, you'll notice it is greatly reduced.

If you use larger orings etc in the bottom....you'll end up with more friction and the shocks will not be as nice.
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Old 05-06-2012, 05:59 AM
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In the Kyosho MP9 thread they complain about the same loose pistons.

Has anyone, maybe, thought that they are supposed to be loose? A loose piston will find the center of the body as the oil flows around it. A tight piston will drag on the sides sometimes and cause inconsistant damping.

I mean it's a bit odd that the 2 best built cars have consistantly the same problem..... But is it even a problem at all? If you feel the shock is too soft because oil flows around the outside of the piston, just use a piston with smaller holes, it works out the same anyways.

Kinda like how everyone in the paintball world is overboreing thier barrels. As long as airpressure flows around the ball it'll go straight down the barrel.
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Old 05-06-2012, 06:42 AM
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Originally Posted by rfleck
Two of us have lost a throttle servo while running medium flex. I suppose this could be a coincidence. Anyone else? Wondering if leaving those two screws out is too much vibration.
I run medium flex on maybe the hardest surface track in Texas and no problems here.
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Old 05-06-2012, 07:47 AM
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Originally Posted by Jaf1977
Is more the fit of the piston than the orings/guides. If you use a piston with a larger diameter and that is a better fit in the body, you'll notice it is greatly reduced.

If you use larger orings etc in the bottom....you'll end up with more friction and the shocks will not be as nice.
Check your shocks. I don't think it's the pistons as much as it is the guides. But I second the o rings, wouldn't recommend changing them....
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Old 05-06-2012, 10:26 AM
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Originally Posted by mcion
I run medium flex on maybe the hardest surface track in Texas and no problems here.
What med flex are you guys talking about? I don't get it.
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Old 05-06-2012, 11:52 AM
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Originally Posted by fastboy
as i said thats all when and good when you have a smooth track...we dont have smooth tracks in the uk,and most of the jumps we have are chassis slappers as theres usually no downside to land on.

so go stiff springs for landings=car sucks thru bumps and gets thrown about like a rag doll and loses traction.

thats why we all run different setups.
Chassis slapping is actually hard on the chassis components and electronics.

http://www.rctech.net/forum/nitro-of...ad-shocks.html

Last edited by Team Grid RC; 05-06-2012 at 01:09 PM.
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Old 05-06-2012, 01:05 PM
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Originally Posted by oggietiu
What med flex are you guys talking about? I don't get it.
You can adjust chassis flex by removing bolts from the side panels.
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Old 05-06-2012, 03:47 PM
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Can anyone tell me what size flywheel is on the xb9? 32mm or 34mm.
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Old 05-06-2012, 04:08 PM
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Old 05-06-2012, 04:46 PM
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I have vented and foamed one set of my shocks and while running today two of them blew out all the oil on different runs. Am I doing something wrong?
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Old 05-06-2012, 06:38 PM
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Originally Posted by Dos Andos
Hi all,
We have 3 XB9's at our local track and they all seem to have the same issue...
The shock shaft guides in the bottom of the shocks where the o ring's are seem to be a bit of a loose fit. When the shocks are built, if you hold the shock body there seems to be a lot of side play when moving the shaft. We have checked and they have been built correctly. When comparing to other shocks like mugen or losi there isn't anywhere near as much play.
Could some of you please see if your cars have the same?
Help with this would be greatly appreciated
Cheers Andy

u will find the xb9 bottom bush is half the thickness of the xray 808 bush just run the 808 bush , u will be happy
cheers
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Old 05-07-2012, 01:38 AM
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Originally Posted by Zerodefect
You can adjust chassis flex by removing bolts from the side panels.
Somehow I missed that tuning option. Where was it written? Side Panel meaning the black chassis guard on the side? I installed everything according to Manual, whats my Chassis lex now Hard? or Medium?
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Old 05-07-2012, 01:39 AM
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Originally Posted by hyper9boy
u will find the xb9 bottom bush is half the thickness of the xray 808 bush just run the 808 bush , u will be happy
cheers
Thanks I was thinking of using that. The XB9 ones do wear faster.
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Old 05-07-2012, 01:47 AM
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hey guys just wondering if anyone is running the fioroni dual action pistons in the xb9?

will the 16mm fioroni pistons fit in the xb9 shock body? i know the xb9 pistons are bigger then the 808 ones but not sure if 16mm fioroni's will fit it.
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