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Cobra R's
Rear camber adjustment tricks?
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<blockquote data-quote="racer726" data-source="post: 1031285" data-attributes="member: 12306"><p>There is probably a range you want to stay in, I would estimate very roughly that it's 1.2 to 2.0 degrees with delrin and again roughly 1.4 to 2.2 degress with Cobra R bushings, at the track with R compound tires, as an example. Looking at the temperature profiles when running at the track along with car balance and driving style, there are several factors that would influence you to go with either the higher end, the lower end, or somewhere in between.</p><p></p><p>Now that's sort of mumbo jumbo I guess To clarify, when the determination is made to increase neg camber during the off-season from say 1.3 degrees to 1.6 degrees, for whatever tuning reason (lets say that one has determined that it's the right thing to do to achieve better cornering grip, better balance, drivability, traction, lap times, or whatever)... if at the same time the rear bushings are changed to a less compliant material, then that bushing change would also provide the benefits of increased negative camber relative to the soft bushings, in a dynamic cornering situation. In other words, one would not have to go to as much negative camber due to the addition of the bushings.</p><p></p><p>I would say that -1.5 degrees is an excellent decision if one were to blindly guess, even with the delrin bushings. The situation where you may want to decrease that is if the temperature profiles across the tire carcass were significantly skewed towards a hotter inside section area as determined by either observing the condition of the rubber, or by using a tire pyrometer. </p><p></p><p>1.5 is what I have on the car, and if it wasn't for the fact that the car is pretty well balanced, i would add a little more negative camber in the rear. A guide is also that if decreasing rear negative camber, the car will tend to over steer more, and decreasing front negative camber, and a car will tend to understeer more... but I'm sure that's nothing new to anybody in this forum, just something to consider with decisions regarding camber.</p><p></p><p>Stay with -1.5, and if you find that understeer is increased beyond your liking, then reduce it to perhaps -1.3... just remember that understeer increased due to the fact that rear cornering grip is increased relative to the front especially during beginning and the middle of the turn. It's sort of a steal from Peter to give to Paul ordeal, but the right changes will have a good benefit in overall track times of course. Unless the inside temps are excessive though, as I've indicated, I would tend to go with increasing the front neg camber in such a scenario. Hope that makes sense.</p><p></p><p>Dave</p></blockquote><p></p>
[QUOTE="racer726, post: 1031285, member: 12306"] There is probably a range you want to stay in, I would estimate very roughly that it's 1.2 to 2.0 degrees with delrin and again roughly 1.4 to 2.2 degress with Cobra R bushings, at the track with R compound tires, as an example. Looking at the temperature profiles when running at the track along with car balance and driving style, there are several factors that would influence you to go with either the higher end, the lower end, or somewhere in between. Now that's sort of mumbo jumbo I guess To clarify, when the determination is made to increase neg camber during the off-season from say 1.3 degrees to 1.6 degrees, for whatever tuning reason (lets say that one has determined that it's the right thing to do to achieve better cornering grip, better balance, drivability, traction, lap times, or whatever)... if at the same time the rear bushings are changed to a less compliant material, then that bushing change would also provide the benefits of increased negative camber relative to the soft bushings, in a dynamic cornering situation. In other words, one would not have to go to as much negative camber due to the addition of the bushings. I would say that -1.5 degrees is an excellent decision if one were to blindly guess, even with the delrin bushings. The situation where you may want to decrease that is if the temperature profiles across the tire carcass were significantly skewed towards a hotter inside section area as determined by either observing the condition of the rubber, or by using a tire pyrometer. 1.5 is what I have on the car, and if it wasn't for the fact that the car is pretty well balanced, i would add a little more negative camber in the rear. A guide is also that if decreasing rear negative camber, the car will tend to over steer more, and decreasing front negative camber, and a car will tend to understeer more... but I'm sure that's nothing new to anybody in this forum, just something to consider with decisions regarding camber. Stay with -1.5, and if you find that understeer is increased beyond your liking, then reduce it to perhaps -1.3... just remember that understeer increased due to the fact that rear cornering grip is increased relative to the front especially during beginning and the middle of the turn. It's sort of a steal from Peter to give to Paul ordeal, but the right changes will have a good benefit in overall track times of course. Unless the inside temps are excessive though, as I've indicated, I would tend to go with increasing the front neg camber in such a scenario. Hope that makes sense. Dave [/QUOTE]
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