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FYI I brought up the piston size/rotor/brake bias to AP Racing, here is what they said:
I've been using center of the brake pad for my brake torque calculations. The OEM Brembo pads are the widest I've seen at 61mm. The AP Racing pads are either 43mm or 50mm wide. It's not really a huge difference, though. A couple percent at most.
Pardon my ignorance for bumping this from the dead, but does the 8350 caliper work with the factory rotors or not? Someone mentioned they may but it'd be nice to have concrete info! Thanks.
Pardon my ignorance for bumping this from the dead, but does the 8350 caliper work with the factory rotors or not? Someone mentioned they may but it'd be nice to have concrete info! Thanks.
Pardon my ignorance for bumping this from the dead, but does the 8350 caliper work with the factory rotors or not? Someone mentioned they may but it'd be nice to have concrete info! Thanks.
The 8350 AS PICTURED on essex parts does not work with the stock rotor, it's designed for the far superior 2 piece rotors they sell with it. Leaps and bounds above any Girodisc-like you're thinking of using. Plus you get the meaty pads that literally last you all season.
Austin had briefly worked on a REAR 8350 that would indeed use the stock REAR rotors. I think he made raw brackets but never ended up offering it for sale because of little demand, but he still has the designs. I'm actually considering going that route at some point. Either of us can hook up Essex gear for a steady discount over the retail site.
The 8350 AS PICTURED on essex parts does not work with the stock rotor, it's designed for the far superior 2 piece rotors they sell with it. Leaps and bounds above any Girodisc-like you're thinking of using. Plus you get the meaty pads that literally last you all season.
Austin had briefly worked on a REAR 8350 that would indeed use the stock REAR rotors. I think he made raw brackets but never ended up offering it for sale because of little demand, but he still has the designs. I'm actually considering going that route at some point. Either of us can hook up Essex gear for a steady discount over the retail site.
Thank you, gentlemen!
Balrok - if you wouldn't mind PM'ing me the price of the 8350 fronts, that would be appreciated!
Yea I did make a couple kits for this exact thing, CP8350s on stock rotors, but the interest level just wasn't high enough to push it to production. Still have one kit laying around that I was keeping for myself but am not opposed to selling it. Fits both stock and SSB knuckles.
I just confirmed with AP Racing than the 8350 was intentionally designed with less front brake torque, and that we are to use pads to adjust brake amounts. What is interesting is even the 9660's with 372s, according to their calculations, are not that much more than factory. The last is a theoretical if you use a 340mm rotor. 8350-325 94% of OE
OE 100%
9660-372 104% of OE
8350-340 99% of OE (disc does not exist, caliper limited to 330 mm disc diameter)
Reflects what I felt with the pedal, which was a disconcerting lack of stopping power from these brakes. It felt like I really had to stand on the pedal harder than I've ever had to to get the car to stop. DS2500s in an autocross environment, 50 degree day. The Evo 10 brakes, on the other hand, felt amazing. Car always stopped better than I thought it would. RE71RS on a 17x9.5.
I can't afford to yet another brake system, so I guess I'll just be stuck with this setup.
And i've gone the other way - It was too easy to get into the ABS, so I disconnected the brake booster and went from a 1+1/16 master cylinder to a 7/8 master cylinder.
Now I can relatively consistently hit the brake pressures I want on the track (~800psi) and has improved control.
Force required on the pedal is much much more than the factory setup, but I like it better.
And i've gone the other way - It was too easy to get into the ABS, so I disconnected the brake booster and went from a 1+1/16 master cylinder to a 7/8 master cylinder.
Now I can relatively consistently hit the brake pressures I want on the track (~800psi) and has improved control.
Force required on the pedal is much much more than the factory setup, but I like it better.
I just confirmed with AP Racing than the 8350 was intentionally designed with less front brake torque, and that we are to use pads to adjust brake amounts. What is interesting is even the 9660's with 372s, according to their calculations, are not that much more than factory. The last is a theoretical if you use a 340mm rotor. 8350-325 94% of OE
OE 100%
9660-372 104% of OE
8350-340 99% of OE (disc does not exist, caliper limited to 330 mm disc diameter)
Reflects what I felt with the pedal, which was a disconcerting lack of stopping power from these brakes. It felt like I really had to stand on the pedal harder than I've ever had to to get the car to stop. DS2500s in an autocross environment, 50 degree day. The Evo 10 brakes, on the other hand, felt amazing. Car always stopped better than I thought it would. RE71RS on a 17x9.5.
I can't afford to yet another brake system, so I guess I'll just be stuck with this setup.
Yea I was listening to the HPA podcast with Steven Hodgkins of Alcon and he shared a bunch of information about brake bias and brake effiency. My views of the subject were misguided after listening to him and understanding the concepts he was explaining. As always there are calculations and engineering to be done before throwing on a brake kit.
Yea I was listening to the HPA podcast with Steven Hodgkins of Alcon and he shared a bunch of information about brake bias and brake effiency. My views of the subject were misguided after listening to him and understanding the concepts he was explaining. As always there are calculations and engineering to be done before throwing on a brake kit.
I wonder if the 343mm Alcons will fit 17" wheels. it'd be close:
