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AutoX, DE and Racing Discussions All discussions related autoxing, DE, amateur and professional racing activities |
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#1
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As I understand the technicals behind the argument, which is an "if I understand it" ; when the gear is engaged, there is torque being transferred to driven wheels, which counter acts the braking force, at least that is the argument. So, as soon as you hit the brakes, you should also depress the clutch in to disengage the drive, so all you have is the braking force and it is supposed to be more efficient in dispersing the forward energy of the car. The other side of the coin is that when you don't transfer torque, the differential needs to be strong and aggressive to balance the car, preferably a 2-way LSD, not even a 1.5-way. But I am not sure of the technical merits, but at least I should be able to measure the results in couple of weeks
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Fatih Selekler 997.2 GT3 Last edited by FTS; 03-09-2011 at 10:25 AM. |
#2
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if i have to down shift in that braking sequence, then as soon as i am on the brk, i floor the clutch, then heel toe to the gear i want.
if i am only braking without downshifting, which suggest not a very hard braking effort, i will not use the cltuch at all. i would think that if i used clutch for the short light braking effort, i would have to rematch rev with throttle blips as i let out the clutch. seems too much work. |
#3
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The momentum of the car is far greater than the rotational momentum of the drive train compoments and engine. In fact, the engine (with your foot off the throttle) will slow down a lot faster than you can slow the car with the brakes.
One variable that is changing is that this added friction is changing your brake bias by effectively adding breaking to the rear wheels. If your car can benefit from more front bias, clutching while braking will help. If it can benefit from more rear bias, it will hurt. |
#4
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#5
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Is that theory? See, part of the discussion is exactly that: theory vs. factual data. I know I am too analytical sometimes, but that is the reason I want to capture data to prove to me first one way or another without the butt sensors' confusing me. Most of the time, our theories and body sensors say opposing things to us
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Fatih Selekler 997.2 GT3 Last edited by FTS; 03-09-2011 at 10:26 AM. |
#6
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Re: Clutch-in Braking For Better Performance?
My take on it? Pure and utter bullshit. Just another wrong idea that some genius came up with. The last thing that you want to do is be playing around with the clutch as you approach a turn, especially coming down from a high speed.
In fact, since most cars seem to have greater front brake bias, reving to 6K and downshifting will provide significant engine braking to help with deceleration. Let the slow guys do clutch-in braking.
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Larry Herman 2002 GT3 Cup 2006 Boxster S 2006 Cayenne S National PCA Instructor Past Flames: 1994 RS America Club Racer 2004 GT3 Track Car 1984 911 Carrera Club Racer 1974 914/4 2.0 Track Car |
#7
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Re: Clutch-in Braking For Better Performance?
Quote:
I think that being smooth with the contol inputs will deliver far greater benefit (and speed) than the theoretical microscopic gain that you might be able to get by clutching before braking. This whole practice flies in the face of heel/toe downshifting and trail braking. |
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