I just did a DE event (2 days) with my 991.1 S on P Zeros and stock brakes. I would like some advice on tires and brakes moving forward as I plan to do about 10 events per year. I drive in the Instructor group and not sure the OEM equipment will hold up. Car will be used 70% DD and 30% DE, about 10K/year total.

 

I switched from the P zeros to MPSC2's and its a nice improvement in grip but overall the cup 2's can handle the heat better than the more street tire P zero. My P zeros only lasted about 2 days before significant chunking started happening (overheated). I also changed my brake fluid to Castrol SRF. My 991 has been flawless on track. I run in advanced run group.

 

Ran advanced over the weekend with my GTS, first time I've had it on track. P Zeros were at 8000 miles and ready to get rid of so I wanted to use them up. Boy did I ever! MPSS for the replacements next week. I'm tired of frequent track driving (BTDT for a decade) so this is a once a year thing for me with this 991. But if I were going to be doing track driving 10 times a year, I'd have two sets of wheels, period. Track tires on one, streets on the other. Even if you change them at home and drive to the track on the track rubber, still better (IMO) than using street tires (with their better wet and cold performance) up at a fast clip on the track.

 

Castrol SRF Fluid, Girodisc Rotors and get the Ferodo DS2500 Pads. SC2's are great, although the RE71R is a comparable and cheaper replacement. Give me a ring, would be happy to work you through the details and get you set up.

 

I can't speak of your level, but at my level (intermediate solo run group). I would just burn through the OEM tires and brakes, then upgrade to what John mentions I am a fan of use what you got! I used P-zeros and stock brakes on my old 981 and current 991S for half dozen track days without any issues.

 

My hope is to be in a 991 within a year. Very interested in OP questions. Coming from BMW track car with 2nd set of wheels that was mentioned.

Will 19s or even 18s fit over brakes?

 

19s work, 18s will not. The brakes aren't the problem, it's the lower control arm.

 

Been tracking my 2014 C2S steadily since I bought it new. I run 19" wheels, Michelin Pilot Super Sport tires, Motul 600 fluid, Pagid RS29 pads and FVD stainless steel brake lines.

This is also the exact set up I ended up with on my Cayman S which I tracked for several years prior to my 991.

I run in the instructor group as well. I drive all over the country for DE events and can't take R Comps or dry-only tires with me. I have to be ready for all conditions on what I drive in on. The MPSS tire has been the absolute best tire for this I have found. Love them. Long lasting, great grip. No chunking. Wonderful in the rain. Run them up to 38 psi max hot for best results. Hotter and they get greasy.

I upgraded to ATE fluid from OEM but found after a few sessions with deep braking the pedal got soft. Never failed or boiled, but got soft. Motul 600 solved this completely. Even after a weekend of several hundred miles of super fast runs at Road America the brakes are perfect. Solid and confidence inspiring.

Im sold on the Pagid pads. Reasonably good with rotors, and the pads last a long while. Great modulation and no overheating, ever. I've completely toasted OEM pads in a single weekend. Save them for the street.

OEM rotors will get hairline cracks as all drilled rotors do. This can get pretty extensive before it is really an issue. You will likely wear or groove them out long before one fails for cracks. Slotted rotors will not crack but, to my knowledge, only GiroDisc are available for the 991 in a slotted and are VERY pricey. Too much for me. I can replace several OEM for the price of a set of GiroDisc...so that's what I do.

If you do DE's get the Tarret brake caliper mounting stud kit. It will make your life MUCH easier and you won't risk stripping the aluminum strut assembly with the fine thread steel caliper bolts.

Also, get a set of the AWE Wind Foilers. They replace the little black plastic triangles in front of your door windows with ones that have a little flip up at the end. This aero device removes the cabin buffeting at speed which is so bad it hurts your ears even inside a helmet. Makes a difference at street speeds too.

That's a pretty good "track kit"!

 

Sounds like a great setup. Do you have any street drivability trade-offs with any of the components you listed?

I'm planning on my first autocross this weekend in my C2S

 

I switch brake pads before and after each event. (Hence the reason for the Tarret caliper studs) You can easily drive the Pagids to and from any event. I go cross country with them. But for DD they squeal to much for me. Also, maximum braking efficiency for track pads is after they heat up, which they never will do on the street. That said, they do work fine for me on the street. But I switch back to OEM anyway. Well, truthfully, I switch back to the Centric Posi-Quiet pads for DD. Almost no dust!

When my track season is done I leave the Motul brake fluid in through the winter and change out in early spring. Technically, Motul is more hygroscopic than OEM or ATE fluid so it's not a forget-it-forever type of fluid. But it hasn't affected DD for me. Been doing this for a few years.

As for the tires, I keep my track tires separate from my street tires just to reduce heat cycles and extend wear. But my street tires are also MPSS only in 20" on my OEM wheels. Great tire!

Now my set up is for road courses. You might be just fine with OEM pads for autocross. But smaller, lighter wheels and tires will help you a lot. And a less expensive brake fluid like ATE might be fine, too. But I don't have much experience with autocross so hopefully others can chime in on your needs, there. Have fun!!

 

Thanks for all the great advice from very experienced people who enjoy their cars as much as I am hoping to. Awesome track kit just laid it all out for me. Really want to try the AWE product for cabin noise. it can be brutal. Looks like a second set of wheels is a must and probably 19". What make and offsets are being used? Tarret brake stud kit and Pagid RS29's are high on the list. What kind of longevity can I expect from OEM rotors?

 

It really depends a lot on your driving style as to how long your rotors will last. I go through a set of fronts at least once a season but I track a lot and brake pretty aggressively at some fast tracks. YMMV.

I got my BBS set of wheels and tires from Tire Rack. The BBS aren't the lightest, but they are strong and I like the look. 19x8.5 51mm offset and 19x11 56mm offset. There are several other brands available and even OEM take offs are great. But I would suggest sticking with 19".

 

A lot of good advice here. I run MPSC2s street and track, PFC 11 pads, motul 600 fluid and a very aggressive alignment that works fine on the street. I'd love to have solid bushings and 2x stiff springs on the track but I doubt I'll do it with this car as it's never going to be track only as its too good of a street car.

 

I track my 991 regularly, and its also my DD
Does anyone have experience with brakeperformance.com rotors
I have read some 997 owners using their slotted rotors, but I'm wondering whether anyone who tracks a 991 has used these?
I go through OEM rotors and am looking for an alternative to keep replacing them or using Girodisc rotors
any advice on other rotors for tracking is appreciated

 

The last I checked any brand less expensive than Girodisc were only able to supply a slotted rotor for the rear.