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Old 05-21-2018, 06:41 PM   #21  
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Have you ever watched a video of a top sedan racer racing an older car where they had to use all the peddles all the time? Its amazing watching them left foot set pads before braking zone prior to beginning threshold braking with right foot.
I've done a lot of this.

The problem is flex in the upright/hub assembly causing the rotors to push against the pads and subsequently push the pistons back in to the calipers. Typically worst in high-G back and forth complex sections. Floating rotors eliminate the knock-back. It's a reactionary solution, I'd prefer to eliminate the flex that is the root cause, but at least at this point in the development of fast Miatas, we don't have that solution yet. Floating rotors are a solution. Regarding floating rotors, how much float you need depends on lateral grip and specific track. Stoptech has a Street and Race version of the floating hardware. The Street has solved 99% of the knockback in my car for all of the SoCal tracks I frequent. At VIR I had substantial knock-back, first time since changing to floating rotors. Possibly because that track has way more complexes with lots of load than most, including the "esses" which I was doing 135mph through. On my dry laps I was pre-loading the pistons with my left foot before every braking zone, and elsewhere just to reassure myself they were still there. Looks like I need the race version at that track.

As a result of my testing, we sell the floating version of the ST kit because that's what works. Street floating version by default, Race by request.

I haven't tested the Ken Auto brace, but I'm skeptical.
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Old 06-06-2018, 12:17 AM   #22  
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I too have been chasing pad knock back ever since I installed my TSE dynapro kit. Glad to hear its not just me. Anyone else having issues with slightly funky pad wear? I think the calipers need the bridge bolt that FM sells. https://www.flyinmiata.com/dynapro-bridge-bolt.html
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Old 06-06-2018, 02:27 AM   #23  
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I get tapered wear with the dynapros, but no knockback.

The bridge bolt might help a bit, but I wouldn't expect miracles from it.

--Ian
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Old 06-06-2018, 03:39 AM   #24  
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Its not that bad. Only slightly tapered but enough for me to care. FM says 10% increase in stiffness which should be enough to take care of most of the problem I think. Its only $30 for the kit so whatever. The flip side is with how much im tracking the car, im thinking of doing superlites on custom full float rotors. Or an AP racing caliper of some sort. This will allow more pad without the knocked issue. We are working on a potential kit now.






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Old 06-06-2018, 08:56 AM   #25  
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I haven't worn out a set of pads with my setup working properly, but the set that ate **** in quick fashion were tapered/uneven as well. Hopefully i'll get enough driving in this year to wear the PFCs to see if they're tapering or not. I just added bridge bolts and went to the HD rotors in my car.
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Old 06-06-2018, 07:38 PM   #26  
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im runnig PFC 11s for what its worth. This is my 2nd set.
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Old 06-06-2018, 07:43 PM   #27  
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I have 01s, which i think are same, or close enough to 11s.

The set that ate **** were not PFCs.
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Old 06-07-2018, 12:06 AM   #28  
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I think im gonna go back to G-LOCs. Ive gone through 2 sets of PFCs in 9 months.
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Old 06-07-2018, 12:14 PM   #29  
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Quote:
Originally Posted by MiataMan00 View Post
I think im gonna go back to G-LOCs. Ive gone through 2 sets of PFCs in 9 months.
Stock brakes? Ducting?
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Old 06-07-2018, 12:25 PM   #30  
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With a good driver in a fast car, you can only expect to get 3 days or so from a set of 12mm pads. Maybe 4-5 days from 16mm pads. 6-7 days from 20mm Superlite pads is the norm.
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Old 06-14-2018, 04:14 PM   #31  
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Old 06-14-2018, 04:24 PM   #32  
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I just saw a discussion about that valve on another forum yesterday. Apparently it's frequently used by honda road racers who have problems with knockback caused by flex from weak hubs and knuckles. Supposedly works pretty well. Should have basically the same effect as the knockback springs that AP Racing and some of the other high end calipers have built in. I'm trying to get my friend to try it on his V8 car.
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Old 06-14-2018, 06:38 PM   #33  
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Quote:
Originally Posted by sixshooter View Post
Stock brakes? Ducting?
TSE Dynapro kit, 3" Singular ducts
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