Xray T4 '13

Old 05-27-2013, 03:32 AM
  #3766  
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Originally Posted by Skiddins View Post
If you've had to go that extreme with the rollbars you have another problem.

NOBODY runs without a rear roll bar as it effects the transition of the car.

Post your setup so others can have a look and make sure you fill in as much information as possible.

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Have to disagree Damien, I ran without the rear roll bar at Eastbourne in the SRL in my last final leg as I was struggling with set up - set the fastest lap and apart from a couple of bad laps (bit of unfortunate maneuvers by other drivers as I was getting past them ) would have won that leg.
Wish I had taken it off a bit earlier
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Old 05-27-2013, 05:18 AM
  #3767  
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Originally Posted by Barry_Hughes View Post
Have to disagree Damien, I ran without the rear roll bar at Eastbourne in the SRL in my last final leg as I was struggling with set up - set the fastest lap and apart from a couple of bad laps (bit of unfortunate maneuvers by other drivers as I was getting past them ) would have won that leg.
Wish I had taken it off a bit earlier
Interesting. I have thinner roll bars in case needed, but I never take them off completely as when I used to do that (a few years ago now) it felt good and did increase rear grip, my lap times suffered as it seemed to be worse on parts of the tracks with changes in direction.
There was always something else that could be changed to give me a better result.
I have never removed them since

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Old 05-27-2013, 08:46 AM
  #3768  
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Originally Posted by cyba888 View Post
guys I am getting understeer and would like to decrease it a little bit more. Also want the car to have better turn in on slower corners.

my current setup on asphalt is below

530CST shock oil front and rear
2.5 springs all around
shocks laid all the way down front and rear
rear diff 2000 oil
stock sway bars and everything else is from stock setup.

I have all the option sway bars and springs to test out just not sure which setting I should touch first
I agree that your oil is a bit thick. Which piston are you running? To get more steering I would start by adding 1mm of of shims to your steering rack for a total of 2mm. After that, go to the short camber links front and rear. Finally shorten your wheelbase in the front and rear of the car by 1mm (bring the front arms back and the rear arms forward).

Sound familiar Damian?
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Old 05-27-2013, 08:58 AM
  #3769  
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Originally Posted by Skiddins View Post
Interesting. I have thinner roll bars in case needed, but I never take them off completely as when I used to do that (a few years ago now) it felt good and did increase rear grip, my lap times suffered as it seemed to be worse on parts of the tracks with changes in direction.
There was always something else that could be changed to give me a better result.
I have never removed them since

Skiddins
I wanted to try thinner bars but only had thicker ones for the rear, no-one else running the T4 had any thinner, so decided to remove it completely.
Funny though at Eastbourne the times improved considerably

Normally like you I always run roll bars.
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Old 05-27-2013, 09:23 AM
  #3770  
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Thanks for the tips guys. What do you mean by "go to the short camber links front and rear"

This is the track I run at

http://www.youtube.com/watch?v=NXba8Nl1Y7Q
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Old 05-27-2013, 09:46 AM
  #3771  
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The length of your upper links. Run the shortest links available.
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Old 05-27-2013, 10:24 AM
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You mean remove all the shims under the camber links?
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Old 05-27-2013, 10:27 AM
  #3773  
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Originally Posted by Barry_Hughes View Post
I wanted to try thinner bars but only had thicker ones for the rear, no-one else running the T4 had any thinner, so decided to remove it completely.
Funny though at Eastbourne the times improved considerably

Normally like you I always run roll bars.
At Eastbourne i went thinner on front roll bar, 1.3mm, but left the rear at 1.2mm (my default is 1.3mm at the rear) for my fastest laps
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Old 05-27-2013, 10:29 AM
  #3774  
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Originally Posted by CristianTabush View Post
I agree that your oil is a bit thick. Which piston are you running? To get more steering I would start by adding 1mm of of shims to your steering rack for a total of 2mm. After that, go to the short camber links front and rear. Finally shorten your wheelbase in the front and rear of the car by 1mm (bring the front arms back and the rear arms forward).

Sound familiar Damian?
Hmm, there is something familiar about it

Have you found the extra shims on ackerman help through slower corners, or just in general?
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Old 05-27-2013, 10:40 AM
  #3775  
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Originally Posted by Barry_Hughes View Post
Why do you refuse to put thicker oil in the rear diff?

If you look on Xray's own forum the top drivers all run with thicker oil.

I run on carpet & ashpalt, when I first had my T4 I ran with kit oil in the rear diff changed it to 2000 and would NEVER go back to 700, the car is so much better with the thicker oil.

Never ever say no to any change advised, try it, if you don't like the difference it makes go back, but it is always worth trying something
My reasoning is... Thicker oil will give more even power to both rear wheels upon acceleration and make the rear end loose. Thinner diff oil will give more power to the wheel with less grip and the rear end will have less contribution than the front end upon acceleration which will make the car more stable coming out of a turn.
If my problem is understeering I would change my diff oil to thicker one.
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Old 05-27-2013, 10:42 AM
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Originally Posted by Skiddins View Post
Interesting. I have thinner roll bars in case needed, but I never take them off completely as when I used to do that (a few years ago now) it felt good and did increase rear grip, my lap times suffered as it seemed to be worse on parts of the tracks with changes in direction.
There was always something else that could be changed to give me a better result.
I have never removed them since

Skiddins
I had great luck with no rear bar and a very light front bar (thanks Paul L. for the loaner) at the Reedy Race this past weekend. The car was very easy to drive and felt really consistent corner to corner. The key was a relatively stiff set of springs from RSD. My setup is here.
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Old 05-27-2013, 10:43 AM
  #3777  
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Originally Posted by cyba888 View Post
You mean remove all the shims under the camber links?
No, they mean the hole in the upper clamps that the link screws into.
Use hole 1, not 2 or 3.
If you look at a proper Xray setup sheet you'll see what I mean.

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Old 05-27-2013, 11:00 AM
  #3778  
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got it thanks
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Old 05-27-2013, 11:01 AM
  #3779  
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Originally Posted by erchn View Post
I had great luck with no rear bar and a very light front bar (thanks Paul L. for the loaner) at the Reedy Race this past weekend. The car was very easy to drive and felt really consistent corner to corner. The key was a relatively stiff set of springs from RSD. My setup is here.
Why such a high rear link (compared with the front)?

Did you try any slightly softer sprtings like the RSD Silver's or Grren's?
What did you think?
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Old 05-27-2013, 11:01 AM
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