OGRacing

iTrader: (1)

it all depends on your aero balance.

the debate over what calipers to use comes down to “it depends”. We are trying to find a dynamic balance under braking. A wide spread solution that many Miata’s are finding a good balance is with a aftermarket prop valve, a 11.75” Front brake kit (V8 roadsters for example), and the sport rotor Rear w/spacing out the factory 1.8 caliper. This combo has been found to provide good balance with most racers while keeping the parking brake. The sport caliper has a 1.375” piston and the 1.8 rear caliper has a 1.25” piston. The area of the pistons are 1.23^2” for the base and 1.48^2” for the sport caliper. A difference of 18.5% larger to the sport caliper. As there are only 3 ways to affect brake Tq on a given axle (hydraulic advantage, Pad compound, rotor Diameter) and changing piston size falls under hydraulic advantage. the change from 1.8 caliper to a sport caliper will net an increase in rear brake torque. Is this a good thing? If you had an trail braking happy rear end, no. This would make the problem worse. Adding a big rear wing should keep the rear in check and allow you to run more rear tq. Running a sport caliper is an option to add some extra Tq to the rear of the car, just take time to consider if you need the extra tq.

On my own set up my stats are as follows.
2400lbs, 450ish hp, afco shocks 550f/440r, 11.75" F, the 1.8l caliper/ sport rotor R. I can easily obtain a smooth trail braking condition. That might change as I intend to raise the wing 12” and add singular endplates. IMO if a parking brake wasn't needed I would rather have the V8roadsters 11.75” kit on all 4 corners. to bring balance is would choke down the prop valve. It makes bringing spars to the track that much easier and has considerably longer life.

OGRacing

iTrader: (1)

I saw your email thank you for the inquiry.

We are currently backordered on the low tq option pads. Miata turbo has been eating them up. You can keep running the hawks as we wait for a new low tq pad to be sent. Or you can try the 11 compounds. The extra tq means you won’t be able to jam on the brakes as much as pro would. ( I jump the brakes like I’m kicking a football) you’ll need to take it easy but it wouldn't call it uncontrollable.

i street drive 01 compound pads. they start working at a very low temperature. so no need to worry about panic stops. it is a race pad so do take into consideration if you get caught in the rain. if you do wash the wheels as fast as you can. or follow my lead keep a set of black wheels for your track days. nobody notices if black wheels are dirty.

And please ask all the questions you can. I Try to help everyone I can. That’s what I’m here for. + It’s free bumps.

ThePass

iTrader: (3)

First half of that correct, second half is backwards. Moving to 1.8 caliper from sport caliper is 18.5% reduction in torque.

-Ryan

OGRacing

iTrader: (1)

DOHH fixing now

OGRacing

iTrader: (1)

Congratulations to Ryan Passey #thepass.
On his win over the weekend running RTA unlimited class.

He was running pfc 01 compound.

aidandj

iTrader: (5)

**** son, winning GTA unlimited? Thats badass.

monkeywinky

RTA, you mean?
congrats to Ryan

OGRacing

iTrader: (1)

woops

ThePass

iTrader: (3)

Thanks Johnny!

For Saturday practice I co-drove the car with Sean. (Back-to-back sessions in 100* ambient heat all day long and the car didn't miss a beat, but that's a whole 'nother story). I've been telling him he HAS to try these PFC pads. I've been raving about them and he was skeptical. First session he comes back in and says these will be his next set of pads. Enough said

-Ryan

aidandj

iTrader: (5)

Johnny, do I need to switch rotors when switching pads with these? Currently running stoptechs

sixshooter

iTrader: (12)

No. You shouldn't need to swap rotors for the sake of the pad compound. If they are worn and grooved you should be swapping them because of rotor wear, but other than that, no.

aidandj

iTrader: (5)

So I can go back and forth and have one set for track and one for street?

OGRacing

iTrader: (1)

i couldn't say it any better.

yep, you can swap them without worries.

vintagerust

Just to clarify the whole sport rear caliper thing.

The bracket, or carrier, you use, is what determines whether you use a sport pad, or a standard 1.8 pad. If you want to use the standard 1.8 pads, you'll need to buy something like this: Miata Sport rear rotor Kit , so as to use the standard 1.8 carrier (bracket) on the larger sport rotors.

I currently use the sport caliper on the standard rotor and standard pads (along with the standard front brakes), because I wanted more rear brake bias. I found that the car was very prone to locking up in the wet under hard braking (not good in emergency stops), and I didn't want to wreck sliding through a red light, because I got caught on a yellow.
After back to back testing, the fronts still lock up before the rears, I stop in a shorter distance in the dry, and much shorter in the wet, without fear of locking up easily.

Mind you, I daily drive this car on parts store ceramic pads. Were I to be on stickier tires and upgrade to more aggressive pad compounds, that bias may change, but everyone's setup/driving style is a little different, and requires different needs.
I just wanted to mention the above.

aidandj

iTrader: (5)

Wut. This **** is getting confusing. So Sport Bracket with rear standard caliper will need sport pads?

vintagerust

For the most part, yes.

Whether you can modify the standard pads to fit, I don't know. You may run into issues with the hardware. But from everything I've read when I was looking into swapping parts, the carriers determine which pads you use.

Lincoln Logs

iTrader: (1)

Not going to lie, I totally thought these were snake oil pads when Ryan first talked about them. After running back to back sessions in his car and experiencing how much win they are...I'm a believer. I can't see myself running anything else now...they are super smooth and control on application and release. At this point the PFC pads are hands down the best pads I've tried.

OGRacing

iTrader: (1)

All,
We (OG Racing) managed to snag the last PFC 0636.97 pads that will be made. we only have 3 in stock. It will be some time until we have another low TQ option for the rear of 1.8l miatas, as we wait for PFC to replace the 97 compound with the 14 compound.




97 Compound.
Low Tq option. Best for low traction events. Example Dirt, rally cross, or low Grip tires. Very easy modulation, good flat Torque curve threw-out heat range. 10% less Tq then PFC 11 compound. suggested for the following tires. toyo R1R, Bridgestone RE-11A, Dunlpo star specs, Falken 615.

if you want to have one of the last 3 97 compounds you will need to email me. Johnny@ogracing.com.

OGRacing

iTrader: (1)

monday... ughh no updates just bumping.

OGRacing

iTrader: (1)

Got more updates. NASA SE June Jam @Road Atlanta - Took home the nasa TTU (unlimited class) win on Sunday. Saturday i came in 2nd. i was running the PFC 01 compound on 11.75" pfc rotors, rear where sport good win racing "Sport rotors" with PFC 06 compound.