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Old 11-12-2014 | 10:21 AM
  #1940  
stelio279
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Originally Posted by b3master
High traction track generally prefers lower RC
Loamy low traction prefers higher RC
Dusty low traction prefers sacrifice, softer balanced springs with slightly higher RC to limit excessive body roll.
b3master, I thought I had a good handle on roll center but you just confused me again

I had understood the effect on roll center, particularly rear RC, as opposite as to what you just posted. I.e. lower rear roll center= more roll and that is BETTER in low traction conditions.

My understanding and reasoning is as follows:

During a curve, you maintain the best traction by maintaining pressure on both inside and outside tires as long as possible. When all weight gets suddenly transferred to the outside tire, you have less overall traction than if both rear tires were gripping). By slowing down weight transfer from inside to outside you get to smooth out this transfer and maintain pressure on both rear tires for longer.

On high traction tracks, we are not as concerned with maximizing traction since there is plenty of it, and we can raise RC to have less chassis roll and take advantage of a more responsive car.

Does this make sense to anyone else or do I really have it all wrong???

Note that I had come to this understanding based on reading-up a lot on this issue, including different books on (full scale) auto racing, several articles and websites such as this one: http://www.thecartech.com/subjects/a...oll_Center.htm which states:

"Effects of Front Roll Center Adjustment

Front roll center has most effect on on-throttle steering during mid-corner and corner exit.

LOWER front roll center
* More on-throttle steering
* Car is less responsive
* Better on smooth, high grip tracks with long fast corners

HIGHER front roll center
* Less on-throttle steering
* Car is more responsive
* Use in high grip conditions to avoid traction rolling
* Use on tracks with quick direction changes (chicanes)"
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