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| Oversteed on acceleration https://setup.teamxray.com/xsetup/legacy/viewtopic.php?f=8&t=11535 |
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| Author: | Ruben_qlc [ Tue Jul 05, 2011 14:09:42 ] |
| Post subject: | Oversteed on acceleration |
Hello everybody. In my last race I have a serious problem: My Car oversteed on power acceleration in fast corners. I think the problem is that I use a diff silicone on rear with 50mm shafts and in front I use a spool and 52mm shafts ECS. Can be caused for use a more short shafts on rear???? I review all the parts of the car without find the problem. Regards. |
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| Author: | Bytestream [ Tue Jul 05, 2011 17:11:48 ] |
| Post subject: | Re: Oversteed on acceleration |
| Author: | Andrew Webber [ Wed Jul 06, 2011 00:21:39 ] |
| Post subject: | Re: Oversteed on acceleration |
The car has been working OK until the last meeting? If this oversteer is a sudden change you need to establish was setup changes have been done to the car. This is the first time you've used a gear diff in the rear? What oils is in it? Have you checked your tyres? Made sure they arent coming unglued. |
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| Author: | Hagberg [ Thu Jul 14, 2011 16:42:08 ] |
| Post subject: | Re: Oversteed on acceleration |
I would probably say that the short rear driveshafts is the main source of your issues. However, to be able to help out fully I would need to see your entire set-up sheet. If possible, please post online. |
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| Author: | Ruben_qlc [ Thu Jul 14, 2011 16:49:57 ] |
| Post subject: | Re: Oversteed on acceleration |
Ok, sorry I am late. Mi general setup: Downstops: front 6, rear 5 Roll center +-0.00 front and rear No kick-up, No anti-squash Oil Shocks: front 50, rear 50 Toe front º0.5 rear 3º Camber front º1.5 rear º1.5 Chasis height: front 5, rear 5.5 Driveshafts: front 52mm ECS, rear 50mm aluminium Tyres: Jaco 2432 Additive: Tire Tweak 2000 (all surface of the tyre front and rear) Spur: 64p 116 Motor: 4.5 lrp octa wind My difficult is driving with all the space of steering. I use a Futaba 3VC (too old stick radio), and to give little º for fast corners. Is difficult to me move little the sticks. I not sure, but I can´t setup the Exponencial for the steering with this radio. Thank you everybody. Regards, |
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| Author: | Skiddins [ Thu Jul 14, 2011 18:45:42 ] |
| Post subject: | Re: Oversteed on acceleration |
| Author: | Ruben_qlc [ Thu Jul 14, 2011 19:03:39 ] |
| Post subject: | Re: Oversteed on acceleration |
Thank you for your answer. Yes I knew that. But when I configure the EXP to minus, the tyres turn little to the right. Later when I turn to the left, the tyres turn fast, but if I turn to the right the tyres turn slow. In adittion the tyres don´t are on the center. Does happen to you??? Sorry about my english and my explanation. Regards, |
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| Author: | Ruben_qlc [ Thu Jul 14, 2011 19:07:21 ] |
| Post subject: | Re: Oversteed on acceleration |
I hope for my setup: Spool in front Silicone Diff in the rear and 10.000 Oil Regards, |
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| Author: | Skiddins [ Thu Jul 14, 2011 19:11:47 ] |
| Post subject: | Re: Oversteed on acceleration |
| Author: | Chris Adams [ Fri Jul 15, 2011 08:57:50 ] |
| Post subject: | Re: Oversteed on acceleration |
Did you say you were using 10000 wt oil in the back? If so, this will be your number 1 reason why your losing traction on power. Go to 700-1k oil and enjoy your rear traction. Also, a little more rear camber will also help. |
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| Author: | CharlesF [ Fri Jul 15, 2011 10:29:00 ] |
| Post subject: | Re: Oversteed on acceleration |
Hi Something does not sound right on the radio / servo setup as skiddins says.... I run a Futaba 3PL, which sounds similar to yours - my setup method Set ATL the ATL so you have a small (0.5mm - 1mm ) gap between the steering arm and C-hub and equal side-side (alternatively use a setup station to set the anle on full lock equally, and around 23degrees) Dual rate - 90% - 100% by preference Exp -30% Steering speed 100% Some other ideas What roll bars are you running? Going thinner will slow down the load transfer and the "twitchiness". Also check that the tyres are not fouling the bodyshell (check at full lock and with the body pushed down to simulate braking) Charles |
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| Author: | Ruben_qlc [ Wed Jul 20, 2011 02:18:59 ] |
| Post subject: | Re: Oversteed on acceleration |
Thank you very much everybody. I will do all your advice. Regards. |
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| Author: | Ruben_qlc [ Wed Jul 27, 2011 12:45:30 ] |
| Post subject: | Re: Oversteed on acceleration |
Hello everybody. After do some practice, I think that problem is about 2: - Is so thick the oil on the rear silicone diff - Use the 50mm shaft on rear The setup do the car very nervous. I hope this experience will help other drivers. Thank you, regards. |
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| Author: | Danny Buck [ Mon Aug 01, 2011 19:20:46 ] |
| Post subject: | Re: Oversteed on acceleration |
Just to add a point, if you're running a rear roll bar, you could disconnect it for a drastic change so you see the effects straight-away, or you could go to a softer one. I find that if I'm experiencing oversteer on the exit of a corner, I look more towards my geometry rather than my shock and diff setup. Going lighter on your diff oil might make the car more nervous on corner entry under braking, but would cure your problem of corner exit oversteer as you would have less on power steering. Overall, I would look at your upper roll center adjusters and see if you can get more camber gain as the car rolls over to give you a bit more grip, your shock angles to possibly transfer more weight to the outside rear tire, and your rear roll bar, as maybe the car is also just staying too flat through the corner and not generating enough grip in the rear when power is applied. Just some more options to think about. Cheers |
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