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  #1  
Old 25-01-2018
garryplant garryplant is offline
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Default 2018 xb2 diffs out on corner exit

Really struggling with this Inner wheel is spinning like mad on corner exit .

Cars kit setting apart from 2 dot springs all round . Metal gears in diff

Cars is raced on Mb raceway carpet so high grip ! It goes well but after that bit more .

I have tried anti squat reduced and more tow in made it worse if you ask me .

Any ideas ?

Thanks
Gaz
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  #2  
Old 26-01-2018
dazp83 dazp83 is offline
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Have you looked on petit rc for the latest eos setups?
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Old 27-01-2018
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Gary do you have a set up sheet or do you know what oil is in the front shocks as a starter?
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Old 27-01-2018
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Is it diffing out or is the front suspension collapsing?. If it is diffing out,what oil is in it?. I used to run 10,000wt on high grip carpet.
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Old 27-01-2018
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Default Hi

Hi also have the same problem as the car comes past me on a fast corner it sounds like itís spinning one of the rear wheels would thicker oil stop this. 500f 450r 5,000 diff 1 dot springs all round car is really good but noticed it last time I raced which I wonder if itís the same as the guy who started chat
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  #6  
Old 27-01-2018
garryplant garryplant is offline
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Default Xb2 diff out

I will post a setup sheet !

but itís stock setup with 2 dot springs . 7.5 k diff oil .

Thatís about it really .

Apart from a brass front end std kick up .

1.5 deg camber all round .
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Old 29-01-2018
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Quote:
Originally Posted by garryplant View Post
I will post a setup sheet !

but it’s stock setup with 2 dot springs . 7.5 k diff oil .

That’s about it really .

Apart from a brass front end std kick up .

1.5 deg camber all round .

If it's MB, I would suggest that the kit setup isn't ideal (have a look on petitRC for one of the latest EOS team setups), but as a starting point 2dot front springs without a front arb, chances are it's collapsing the front unloading the inner rear.
7k is thick enough even with 2 sat gears in the diff...
What's your ride height btw?
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Old 29-01-2018
dlr dlr is offline
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Slight thread hijack.....how do you measure the ride height? Do you just sit the buggy down, compress it a few times and let it settle or do you drop it from a foot? I have tried both but looking at EOS photos some of them are almost touching the ground in corners despite running say 16-17mm height so not sure how to measure it right

cheers
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  #9  
Old 29-01-2018
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Less anti squat - More out of corner traction, less mid-corner rotation
More anti squat - Less out of corner traction, more mid-corner rotation

So you're right in thinking more anti squat made it worse on exit. Perhaps more weight on the nose so it carries through the corner a little more? Are your springs too soft/oils too light which is causing the corners of the car to collapse? Try standing your shocks out on the towers, this should firm it up/give it more stability.
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Old 29-01-2018
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Quote:
Originally Posted by dlr View Post
Slight thread hijack.....how do you measure the ride height? Do you just sit the buggy down, compress it a few times and let it settle or do you drop it from a foot? I have tried both but looking at EOS photos some of them are almost touching the ground in corners despite running say 16-17mm height so not sure how to measure it right

cheers
Doubt many run on eos at 17mm. My ride height depending on features tends to be 14/15mm and seen plenty top national driver's cars at quite a bit lower.
But you've got it right, drop it on the board from about a foot and that's your resting ride height.
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Old 29-01-2018
dlr dlr is offline
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Thanks, will do that next time

Also noticed my 17 diffing out last time so will continue to monitor this thread
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Old 02-02-2018
steveproracing steveproracing is offline
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Last time I ran at mb I had 700wt front 600wt rear oils with 3dot front 2 dot rear springs. 7.5k in diff. Rear roll bar with 1.2mm bar helps massively to stop the back leg from kicking out. 14mm all round ride height. Hope this helps.
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Old 03-02-2018
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Had exactly the same problem with the XB2 at MB - I really think it's a trait of the car design. I tried everything to get close to where I wanted it - but never quite managed to get the car on the same pace as the YZ2 - and I put that down to the XB2 loosing drive due to this problem.

Try what has been suggested - I ran heavier oils in shocks and heavy springs on the front etc - tired all manner of setups - but couldn't remove the issue entirely....
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  #14  
Old 03-02-2018
stuey stuey is offline
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Would a shorter rear camber link help? May stop the inside rear wheel lifting up coming out of a corner.
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Old 04-02-2018
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If all else fails, a ball diff usually sorts this sort of issue.
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  #16  
Old 04-02-2018
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Quote:
Originally Posted by Danosborne6661 View Post
If all else fails, a ball diff usually sorts this sort of issue.
The 18 ball diff isn't quite available yet, so currently can only get a xh diff to fit plus 3mm dogbones. Not cheap and not convinced the x-ray ball diff will last at the level of grip of MB.

I'm pretty happy with my car at MB (also a 18).
Try 3 dot spring or front arb (1.2mm) with your 2 dot & 8k diff oil with 2 steel gear diff. I don't suffer from diff out issues on reasonable rear tyres...

Do you drive wheel or sticks? If wheel might me able to have a go with mine next time at I'm at MB and see what you think. My setup has a few differences from the typical "team" eos setup, although based on it. Ultimately driving style is rhe biggest factor on how a car needs to be setup.
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  #17  
Old 14-02-2018
garryplant garryplant is offline
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Last thing I want to do is buy another new car to suit the track

I did a few things people said and yes itís better BUT not fixed issue totally .
The harder you push the worse it gets .

Thanks
Gaz
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Old 22-02-2018
Chriso Chriso is online now
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Anyone else got any ideas on how to resolve this?
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Old 22-02-2018
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Quote:
Originally Posted by Chriso View Post
Anyone else got any ideas on how to resolve this?
I'll get torn a new one if i tell you, but Garry knows as he drove the solution last night ;-)
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  #20  
Old 22-02-2018
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Quote:
Originally Posted by neallewis View Post
I'll get torn a new one if i tell you, but Garry knows as he drove the solution last night ;-)
��, you’ve been beaten by enough of them Neil!

Last edited by shaun m; 23-02-2018 at 09:45 AM.
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