| XRAY - Model racing cars https://setup.teamxray.com/xsetup/legacy/ |
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| XB8 Twitchy https://setup.teamxray.com/xsetup/legacy/viewtopic.php?f=9&t=4377 |
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| Author: | twigstoy [ Thu Oct 19, 2006 14:50:27 ] |
| Post subject: | XB8 Twitchy |
My car is real twitchy. I have my steering turned down to -30%. What could make it this way. If I turn my steering up very much more, it is very hard to drive. I need to settle the car down. I have the TQ front end. Roll ctr(0ft 0rear) Kick-up(1up 1dn) Arms long front & rear. 3degree rear toe. |
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| Author: | ajoiner490 [ Thu Oct 19, 2006 15:25:00 ] |
| Post subject: | |
What diff and shock oils are you running? |
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| Author: | twigstoy [ Thu Oct 19, 2006 15:27:40 ] |
| Post subject: | |
Shock oil (40ft-30rear) Diff oils (5-7-4)f-c-r 490, I knew you would rescue me!!! |
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| Author: | Asterix [ Thu Oct 19, 2006 15:28:58 ] |
| Post subject: | |
what ackerman hole and roll centers are you using? |
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| Author: | ajoiner490 [ Thu Oct 19, 2006 15:39:36 ] |
| Post subject: | |
Lol, I'll see if I can help Twigs. Shock oils look good, what pistons and springs? With a thicker center diff oil, you will have to drive "on top" of the car more which makes it feel real twitchy. Try 5-4-4 cps (Mugen or OFNA oils), or 3-3-5. 3-3-5 is real easy to drive where 5-4-4 is easy to drive but gives you more on power steering. Just for kicks, what ackermann position are you running? Run it in the center hole, and if you want to calm it down a little more go to the forward hole. |
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| Author: | twigstoy [ Thu Oct 19, 2006 16:03:28 ] |
| Post subject: | |
| Author: | nitroracer [ Thu Oct 19, 2006 16:50:47 ] |
| Post subject: | |
Are you using the orings in the diffs? Take them out. I suggest you post your complete setup on the setup sheet section so we can take a look at it. Also, if you are running zero bushings in the roll center you need to run zero bushings in the kickup (or vice versa) as well or you will bind the suspension and possibly break the upper arm. |
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| Author: | twigstoy [ Thu Oct 19, 2006 17:03:05 ] |
| Post subject: | |
Oops, I am running the roll center & the kick up the same. (0's all around). I just changed all that. My set up sheet sheet is at home, as I am trying to remember it at work. I do not run the o-rings in the diffs. I do run soft compound tires. |
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| Author: | nitroracer [ Thu Oct 19, 2006 17:05:05 ] |
| Post subject: | |
Do you have it online in the XRAY setup sheet database? What is the link? |
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| Author: | twigstoy [ Thu Oct 19, 2006 17:29:23 ] |
| Post subject: | |
No, I do not have it in the data base. |
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| Author: | Brian M [ Thu Oct 19, 2006 17:45:47 ] |
| Post subject: | |
Dropping the diff oils down will help the car as Adam recomended. How much toe out in the front are you running. Toe out is the light switch for twitchyness. Make sure you are running no more than 1 degree. 1.5-2.0 is a handful. good luck. |
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| Author: | twigstoy [ Thu Oct 19, 2006 17:58:54 ] |
| Post subject: | |
2 degrees toe out. I will adjust. Thanks |
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| Author: | ajoiner490 [ Thu Oct 19, 2006 20:58:33 ] |
| Post subject: | |
Twigs, the roll center chart is in the other thread you had started about breaking upper arms. Check your bearings in the front if you are ballooning one tire, something's not right. |
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| Author: | Keith [ Thu Oct 19, 2006 21:18:37 ] |
| Post subject: | |
To much toe out will make it snap and whip around. I run 1 deg and no more, forward hole on the acermann plate with the bump steer shimmed out (almost completely). |
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| Author: | nitroracer [ Thu Oct 19, 2006 21:20:50 ] |
| Post subject: | |
Yes you shouldn't balloon one tire unless maybe in a turn. If you are ballooning on one side on a straightaway then there is something wrong like ajoiner said. Check wheel bearings, binding, and the diff. |
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| Author: | Rosco [ Thu Oct 19, 2006 22:07:31 ] |
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| Author: | daveg [ Thu Oct 19, 2006 23:16:42 ] |
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| Author: | twigstoy [ Fri Oct 20, 2006 15:26:26 ] |
| Post subject: | |
I am using the stock antirollbars. I am thinking the center diff oil should be dropped a little. |
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| Author: | daveg [ Fri Oct 20, 2006 15:39:36 ] |
| Post subject: | |
what surface are you running on? what tyres are you using? dave |
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| Author: | twigstoy [ Fri Oct 20, 2006 19:04:30 ] |
| Post subject: | |
Good traction surface, Switch clay's |
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