XRAY - Model racing cars

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 Post subject: Xray 2016 T4 Oversteer
PostPosted: Sat May 13, 2017 10:01:07 
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Joined: Sat May 13, 2017 07:59:06
Posts: 4
Hi all

I have been using the attached setup on the black eats carpet, only difference being I have 3k oil in the diff and 1mm shim on inside rear camber link and alloy steering arms. http://site.petitrc.com/reglages/xray/s ... 015121113/
My problem is that as the night goes on the car gets harder and harder to drive with the rear wanting to come round on itself.

Last night I tried the following and it just got worse and worse!
Removed 1mm of shim on inside front camber link
Removed all shims on inside rear camber link
Stood rear shocks up one hole
Stock rear tow
2.5 rear springs
Removed bump steer and Ackerman shim.

My first run is often my fastest and as the grip comes up I rarely improve. It feels like as grip increases the front gains more grip than the rear and I loose balance.
I do try and run my car with full steering on the transmitter, but last night even at 80% steering it was a handful!
Any suggestions? Feels like I am missing something big, the car is fine no binding with oil in shocks and diff.


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 Post subject: Re: Xray 2016 T4 Oversteer
PostPosted: Sat May 13, 2017 12:34:52 
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Joined: Sat Jun 18, 2005 12:48:40
Posts: 1328
Location: Windsor, UK
What bodyshell and tyres?

Have you tried a different set of tyres?

Does the rear want to step out at corner entry/exit or both?

You said removing the front inner shim made it worse.
Have you tried going up on that front shim to 2mm etc?


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 Post subject: Re: Xray 2016 T4 Oversteer
PostPosted: Sat May 13, 2017 12:42:57 
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Joined: Sat May 13, 2017 07:59:06
Posts: 4
Mazda 6 shell, 28 sorex tires at Newbury. I did have 2mm in and out on front links and that was better compared to last night. The tires were on their 3rd week last night but as the grip came up the week before the rear became loose unless I turned my steering down. Can't be sure, but think it is doing it on and off power at corner entry, feels like the initial turn is too aggressive and rears can live with it.


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 Post subject: Re: Xray 2016 T4 Oversteer
PostPosted: Sat May 13, 2017 13:30:23 
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Joined: Sat Jun 18, 2005 12:48:40
Posts: 1328
Location: Windsor, UK
dibble34 wrote:
Mazda 6 shell, 28 sorex tires at Newbury. I did have 2mm in and out on front links and that was better compared to last night. The tires were on their 3rd week last night but as the grip came up the week before the rear became loose unless I turned my steering down. Can't be sure, but think it is doing it on and off power at corner entry, feels like the initial turn is too aggressive and rears can live with it.


Strange, because at Newbury I make my car more aggressive as the evening goes on.
It's also the where I run the most aggressive setups I ever have.

What additive are you on?

I don't think there is a lot of point in giving you my setup, unless you really want it, as it won't work anywhere else and from the sounds of it, you wouldn't like it anyway.

Couple of thoughts
front belt tighter than std, rear belt looser

Space front shocks out (top and bottom)
Harder front spring than rear.
Droop, 5/4


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 Post subject: Re: Xray 2016 T4 Oversteer
PostPosted: Sat May 13, 2017 13:40:39 
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Joined: Sat May 13, 2017 07:59:06
Posts: 4
I am putting your afar setup on my 2015 for next weekend actually! I run sxt additive, I was also thinking of reducing front camber and thicker front ARB? Do you use all available steering throw? I was also going to try 5k in rear diff to see if tat slows rotation down?


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 Post subject: Re: Xray 2016 T4 Oversteer
PostPosted: Sat May 13, 2017 13:54:12 
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Joined: Sat Jun 18, 2005 12:48:40
Posts: 1328
Location: Windsor, UK
dibble34 wrote:
I am putting your afar setup on my 2015 for next weekend actually! I run sxt additive, I was also thinking of reducing front camber and thicker front ARB? Do you use all available steering throw? I was also going to try 5k in rear diff to see if tat slows rotation down?


I have full throw, but only use it when necessary (tight 180 corners etc)
Get some spider green additive, I hate SXT, I don't think it's actually that good (though others disagree)


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 Post subject: Re: Xray 2016 T4 Oversteer
PostPosted: Sat May 13, 2017 14:04:12 
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Joined: Sat May 13, 2017 07:59:06
Posts: 4
I have some lrp that I use in practice, maybe I should use that instead. Will get some green too, thanks for your help


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