Suspension Springs, struts, coilovers, sway-bars, camber plates, and all other modifications to suspension components for Cooper (R50), Cabrio (R52), and Cooper S (R53) MINIs.

Suspension severe oversteer

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Old Oct 13, 2016 | 04:40 AM
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severe oversteer

every run was like this, the first run on cold tires got away from me, and every run I expected it to snap on the same spot and it did

a few cars spun at the same spot, I'm running a JCW in Dstreet with a hotchkis swaybar, gonna be softening that thing now as it was too tail happy the whole course, very tiring not knowing what the rear was gonna do!

I was 33rd raw, 25th pax out of 66, only car d-street and would have won STX too if I had ran that class


same spot on 4th run you can see my head shake as the car unloads the grip at the same spot
 

Last edited by MrBlah; Oct 13, 2016 at 05:59 AM.
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Old Oct 13, 2016 | 05:39 AM
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In addition to softening the rear bar, if you have adjustable drop-links, check that you don't have any pre-load. This should be done with the car's weight on the tires as though it were sitting level on the ground. Also, play with your tire pressure to reduce oversteer.
 
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Old Oct 13, 2016 | 05:58 AM
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adjustable drop links are not allowed in d-street

I went from 40 psi to 32 psi, still over steered but at 32 psi I was rolling over past the triangle markers. Grip was a lot better at 32 psi I wish I could just run them at that, but it tears up the outer edge so bad
 
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Old Oct 13, 2016 | 10:26 AM
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To decrease oversteer, raise your front tire pressure, lower your rear tire pressure.
 
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Old Oct 13, 2016 | 11:08 AM
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that is also a recipe to go slower and the rear already roll over to the "thou shall not pass" markers
 
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Old Oct 13, 2016 | 04:51 PM
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Better to go slower and finish with a clean run than to DNF
 
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Old Oct 13, 2016 | 04:53 PM
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uhh maybe competition not tight where you are
 
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Old Oct 13, 2016 | 05:41 PM
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I'm not an autocrosser anymore. Sr. HPDE Instructor for over 35 years. Once you have a car that is predictable, the secret to going faster is to first go slower but with great precision. Then keep doing it over and over until you realize that you're going faster.
 
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Old Oct 13, 2016 | 05:45 PM
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Originally Posted by NC TRACKRAT
I'm not an autocrosser anymore. Sr. HPDE Instructor for over 35 years. Once you have a car that is predictable, the secret to going faster is to first go slower but with great precision. Then keep doing it over and over until you realize that you're going faster.
My track car is a whole different animal, no giant swaybar very predictable, coillovers and camber it's a night and day difference
 
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Old Oct 13, 2016 | 06:41 PM
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If all you've done to your AX car is the rear sway bar, then it's obviously the problem. What diameter are you using? What setting were you on?
 
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Old Oct 13, 2016 | 06:43 PM
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Originally Posted by NC TRACKRAT
If all you've done to your AX car is the rear sway bar, then it's obviously the problem. What diameter are you using? What setting were you on?
Yes it was I already adjusted it

All you can change is one sway bar in street class
 
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Old Oct 13, 2016 | 06:48 PM
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Again, what diameter? 19mm? 22mm? 25mm? What did you adjust it to?
 
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Old Oct 13, 2016 | 06:51 PM
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Originally Posted by NC TRACKRAT
Again, what diameter? 19mm? 22mm? 25mm? What did you adjust it to?
Hotchkiss hollow race bar full soft for this weekend's dragon run
 
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Old Oct 13, 2016 | 06:55 PM
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If you had it set full soft for the AX, then you need to go with a smaller diameter bar.
 
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Old Oct 15, 2016 | 06:34 AM
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Originally Posted by NC TRACKRAT
Again, what diameter? 19mm? 22mm? 25mm? What did you adjust it to?
Originally Posted by mega72
Hotchkiss hollow race bar full soft for this weekend's dragon run
The Hotchkiss bar is 25mm hollow bar with about the same stiffness as a 22mm. This is a really stiff bar. For stock class, others have matched this with the full JCW suspension and switching out the shocks for Koni Yellows. This gets you stiffer springs and a stiffer front bar, all of which increases the overall roll stiffness of the car, especially in the front. This is important to cut down the loss of camber in the front that occurs when the body rolls. This would help with using lower tire pressures. Overall this provides for a better balanced car. Between, between the adjustable shocks and the adjustable sway bar, you can then dial in the rotation that you want. I believe this was the setup that Charlie Thompson ran in his Gen II MINI.

I apologize for not remembering the particulars of your setup, but it would be helpful to repeat them here. Could you also include what your suspension settings are?
 
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Old Oct 15, 2016 | 06:54 AM
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(deleted)
 

Last edited by Eddie07S; Oct 15, 2016 at 08:49 AM. Reason: deleted
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Old Oct 15, 2016 | 07:32 AM
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Fyi not looking for info just wanted to share

I have Jcw springs and koni shocks
 
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Old Oct 15, 2016 | 07:34 AM
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Also the main video has a delay not sure how to sync the GoPro better
 
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Old Oct 15, 2016 | 08:50 AM
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Originally Posted by mega72
Fyi not looking for info just wanted to share

I have Jcw springs and koni shocks
Sorry - deleted post...
 
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Old Oct 15, 2016 | 09:59 AM
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No need to delete! Others might not know what to do with sway bar setup
 
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