2012 PGP Lapping Days
Joined: Mar 2002
Posts: 588
Likes: 7
From: Bellingham
Originally Posted by RT,Apr 26 2010, 10:40 PM
My experience is they always crack after the run and never during 
Ultimately, brakes are the reason I stopped running the S2000 on the track ..... tried several random aftermarket "Big Brake" combos/options and was never happy forever there after
Knowing you, you'll figure something out because stock fronts are not going to hold up for you with the SC (too much caliper flex and/or cracked rotors every other time out if you go high mu)
Ultimately, brakes are the reason I stopped running the S2000 on the track ..... tried several random aftermarket "Big Brake" combos/options and was never happy forever there after
Knowing you, you'll figure something out because stock fronts are not going to hold up for you with the SC (too much caliper flex and/or cracked rotors every other time out if you go high mu)
RT - how was caliper flex causing issues? What were the signs of excessive flex?
If boost overloads the brake system too much, I'd probably go for some AP calipers and floating rotors.
Joined: Oct 2000
Posts: 14,269
Likes: 42
From: Redmond, WA
The way the flex showed up is the pads would wear at different rates radially (not leading edge wear but thinner at the circumferential edge closest to the tire). The result was a deeper and deeper pedal as the return continued to use more slave stroke. The "solution" was to use a higher mu pad frt and rear to reduce the clamping force but then cracking rotors every other track day started. Then the down hill spiral in to the BBK's began and the tailspin continued right in to the ground
Joined: Mar 2002
Posts: 588
Likes: 7
From: Bellingham
Do you think that was due to caliper flex or thermal expansion of the rotor which is constrained at the hat on the outside face which would cause "cone-ing" in a concave manner. I get the same condition where the outside pad is only contacting on the outer perimeter and vise versa on the inside when hot. I attribute it to rotor dishing while the caliper remains rigid which causes the pad wear. I could be convinced otherwise. If the inside and outside pads both display increased wear at the exterior edge, then I'd conclude caliper flex. Sounds like that's what you experienced.
Joined: Aug 2002
Posts: 28,136
Likes: 8
From: Seattle, Washington
Originally Posted by RT,Apr 28 2010, 05:43 PM
The way the flex showed up is the pads would wear at different rates radially (not leading edge wear but thinner at the circumferential edge closest to the tire). The result was a deeper and deeper pedal as the return continued to use more slave stroke. The "solution" was to use a higher mu pad frt and rear to reduce the clamping force but then cracking rotors every other track day started. Then the down hill spiral in to the BBK's began and the tailspin continued right in to the ground
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