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Question on how the BIG {7420 20mm pad, Afco/ST43 11.75"x1.25" ext.} brake kits are w
Have a question on how the BIG {7420 20mm pad, Afco/ST43 11.75"x1.25" ext.} brake kits are working out long term?
Reaching the limits of my sexy fantastic V8R Stoptech STR 42 11.75"x.810" V8R kit with Ti pistons & PFC floating rotors. Heavy turbo NB2 w sport package & ABS.
I have gotten to the point where a set of PFC 01 pads are more than 50% gone with some taper after one Sebring TT / HPDE weekend, Raybestos ST-43 are just a tiny bit better. Both leave me changing pads on Saturday night or just putting new pads on every weekend, which I end up doing and have a big pile of 1/2 u$ed pads. Luckily pads are cheap.
In my experience the ST43's do work better for me at Sebring, not showing the bit of pad fade 01's do at the end of long braking zones.
PFC11's on the factory ABS sport rear last forever.
Like the idea of the largest Supermiata kit. Don't like the idea of a "proprietary" 1.10" rotor?
Would love input from jpreston, Bronson M, turbofan, emillo700, Twibs415, Padlock, Ext........
I have new pads and new rings ready to install but figured this is the perfect time to upgrade as its best to sell with new pads and rings. If it comes to that.
Specifically how are kits working long term? Fitment with stock a-arms & Miatahubs? Fitment on 15"x9.5" Konig Freeform using slicks on track. Brake balance w sport & ABS? Pads that match up and last?
FYI
FYI this is what happens after you go through 6 sets of PFC pads then throw a set of ST-43's on. So 6 sets then one big crack right as I was setting my quick lap for the weekend.
What kind of power are you making and race weight? That'll help pin down an expected pad life.
To give an example I was running mini Cooper S rotors 11.56x.81" with dynapro calipers. Those would last almost the same as your setup getting 3 days out of a set of dtc60s. On the 1.25" afcos that bumped up to 6 days on DTC60's. Currently on st43's and they look like they might go 7 days but not sure yet. Also I've been expirementing with different brake cooling methods so that estimate may be low compared to the DTC60 data point. This was with 400-420 whp and 2550 race weight.
I have folks running this setup at 200whp, which is massive overkill. They have gone full seasons of 15-20 days on track on DTC60's
As can be seen by temperature strips brakes are running cool enough. Wish I could get more forced air to outer pas as it always wears faster w more taper.
At 10:1 pw/wt you can expect 10+ days out of the pads easy.
The temp strips show the caliper is staying cool, but the pads and rotors are obviously not. Really like the temp paint, I'm hitting 1100 deg or so right now on the rotors.
After much research, we concluded that the 7420 pad shape/volume was the biggest we could fit into a 15x9 in an affordable caliper. We started using them about 5 years ago. Our BX1175 kit is built around that pad. Anything bigger rockets initial cost and consumables, doesnt fit 9's, or both.
It was a hard choice to go with the custom 1.1" rotor. But that allowed us to fit virtually every 9" wheel. Any directional 1.25" rotor of the same mass and thermal capacity is still expensive so we think its the right compromise. Any cheaper rotor meant it wouldn't fit in 9's or the lower volume 7416 pad.
Note: This kit is WAY overkill for any street car and most track cars not running high horsepower, Hoosiers and on a track like Sebring.
My preferred ST43 pads are out of stock everywhere so went with tried & true PFC11's.
Have not done anything but bed pads yet and will see how balance is once on track with a new set of R7's.
IMHO Trackspeed and V8R are both missing a small but important market segment with their insistence on using thinner or non standard rotors.
Yep, got a full list for the next batch so getting them moving with the CNC shop. Have over 2 dozen sets making laps now. Keep this up and I may be able to bring the CNC work in house
Have some good data and feedback now.
Ran car at Sebring last weekend in TT3. 270HP 225 R7's and new Miata track record.
The good;
PFC 11 pads worked fantastic from 1st lap 1st turn, no fade, no overheating, no problems. Good ABS balance with sport rear PFC 01.
It was a cool weekend and running TT not endurance long runs, but brake temps were fantastic for me.
Pad and rotor wear were very good. I used to wear a set of PFC 11 pads 60% down in one weekend these will last multiple weekends. Imagine the ST43's I have on the shelf will last even longer.
Godsend final fix for stupid fast heavy cars on heavy braking tracks & advanced drivers on slicks, AKA Sebring.
Actually was overslowing on a few corners. Will take a while to get used to feedback/power or lack of pad fade.
The bad:
Absolute overkill for most people. They are heavier and pricy. 90% of track guys do not need the mass and excess cooling.
06-30-2022, 04:54 PM
Question on how the BIG {7420 20mm pad, Afco/ST43 11.75"x1.25" ext.} brake kits are w
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