BradB

My TPMS readout is the one I have active when I am running the track. It's within 1lb accuracy of my gauge. So I see my pressures rise as I drive. I can only start out so low to be safe and I come in when I reach my usable max and the car starts losing traction. I can easily gain 10-12lbs of pressure in a 20-30 minute run. I let air out all day between sessions. It's a balancing act. I also have a pyrometer to check temps and help monitor pressure and wear.

Archimedes

I was under the impression that all PDCC cars were SPASM, but I'm not 100% sure on that.

EDIT: Just saw the reply. Learn something new every day.

Archimedes

Is your TPMS higher than your gauge? I ask because I use a really accurate Motion Pro gauge and it is consistently 1-2lbs lower than my TPMS readings.

Archimedes

Did you have the X73 sport suspension, or the standard? I'm really on the fence about making the switch.

BradB

Yes, my TPMS reads 1-2lbs lower than my Longacre dial gauge. I'm just thrilled that's it's as close as it is. Makes it quite useful as the session goes on.

As for the Cayman, I had the stock PASM suspension.

cloud9blue

I assume you still have your stock wheels and tires no? If that's the case, MPSC2 are perfectly fine in rain (they are the stock tires for GT3 and Z06 after all, and those things are still need to drivable in rain), and you can switch back to your stock tires for street use and heavy rain use. NT01 is probably fine with light rain as well, but you need to watch out for standing water more than MPSC2 due to more aggressive tread design.

I think the standard 991 front fender has plenty of clearance up front for 255 and maybe 265 (GT3RS runs that size, but that car has a widebody fender) as well, given how stretch the 245 tires are on the wheels with stock width and offset. Just FYI, euro cars typically have plenty of tire-to-fender clearance since TUV requires them to be able to safely fit a set of snow chains.

But you should measure how much clearance do you have between the tire and fender well liners at full steering locks as well. I torn up the oil cooler on my E92 once running oversized front tires.

Hope that helps. And if you have any videos of the thing on track, please share. Non-GT3 991 track videos are surprisingly hard to come by for whatever reasons.

Archimedes

Mine's the opposite, my gauge is lower than my TPMS and I trust my gauge more.

I have the base, non adjustable suspension in my Cayman S. Car handles great, but I've heard the X73 suspension really transforms the car.

Ski Porsche

I get to the track three to five times a year. Compared to my past cars the C2S is a rocket.

maxpowers

I took mine on the track for the 1st time a few months ago. A lot of fun and the car did exceptionally well

BradB

I researched different tires to fit my 19" wheels and am disappointed that there is so little choice. The goal is to maintain as close as possible to the original rolling diameter and that is proving very difficult. I would love to get some Pilot Sport Cup 2's or similar but the sizes don't work out.

Does anyone know just exactly what variance of diameter is allowed?

Gem Mookherjea

1)going from MPSC2 to Trofeo R next, the needed stiffer coils for stickier tires are on the car now, and teh car sits lower than PASM as desired

2)went from PASM to home made SPASM using KW HAS kit (30% stuffer coils)and TPC bars, very happy at the track with it now; would LOVE a TPC 991S DSC next before trying out a JRZ setup on this car if that doesnt get me closer to what I want

3)running the Pagid rs29 pad and moving to girodisc next, braking is better with the pagids. no plans for a BBK

4) ordered monoballs from elephant racing, these will be nice on tarmac

5)running Tarrett 991 camber plates @ -2.7 front camber

BradB

You've done a lot!

What size wheels and tires are you running? I am finding tire sizes that work with OEM spec wheels limited.

What benefits do you anticipate with the Girodisc? I can't get over the cost.

c_Gio

Prob not track... Note enough $$ in the bank to risk it... But autoX, absolutely.

Gem Mookherjea

I run open track days and like playing with vettes, prepped m3 and the like.

Tires are key, dont waste any time with OE wheels and tires. I went with some inexpensive OZ stuff of tirerack, but if your budget allows for forged, do it! For me, having considered 19s, and not all fitting,I simply stayed with 20s, and found three tires I like alot:
-MPSC2 for street and track, just not the sticky icky I need on track
-DUNLOP Sport Race Maxx for track with some street possible, also usable wet
-Trofeo R a trackday monster

great question: Girodiscs are simply a lighter larger rotor retaining oe calipers. The OE brakes get over their head on hard hard braking before chicanes, ABS engages sooner than I like; where my buddy in his z28 out brakes me with his ccb. I want to try and have better modulation with the brakes so upping rotor size makes sense; however there is nothing available from AP/Essex for the 991S; they only have gt3 stuff so far but talking with Jeff Ritter it IS in the pipeline

I forgot-
1- My car is not Sport Chrono, so I added a Tarret supplied Transmission mount that does increase the nvh slightly but after a few days even wife got used to it, it does keep the entire driveline from moving as much in fast transitions, see link below

2-i'm on Torque 700 brake fluid and also use ATE gold and SRF in my garage

3-I've ordered Elephant Racing monoballs (ask for Chuck) and am considering his FEA designed cnc lower rear links, and would steer clear of the Agency copycat part, btw.

http://www.function-first.com/products/991

http://www.6speedonline.com/forums/9...che-991-a.html

http://www.tpcracing.com/cayman-boxs...uspension.html

http://www.rennsport-one.com/shop/pagid-rs-29-rear-991/
http://www.rennsport-one.com/shop/pagid-rs29-front-991/

https://rennlist.com/forums/997-gt2-...xx-race-2.html

in retrospective reconsideration I would also consider the Elephant kit which can be ordered with stiffer coils than the KW setup right off the bat, however u may also find a preference for 70mm ID coils as per same height of coil spring there is more winding than on a 2.5ID coil and hence, sometimes a better ride quality on softer springs, I suspect.

I cannot emphasize enough how much the TPC sways were a boon, pricey but worth it, and just as critical is the alignment, dont skimp here; I went to EVOMS who uses a Beissbarth; the front camber is essential, as is rear toe on this chassis. Dont be stingy on either


Next mods:
GMG Seat base and atleast a drivers trackday seat

maxpowers

I took my car to the track and had a horrible experience. The car itself was even better than I expected, but I was extremely disappointed with how the whole event was run and the (almost non existent) instruction either on or off the track. After that I don't know if I'll ever take my own car on the track again.

If you're planning on keeping the car for many years is taking it on the track once a year going to beat it up? Also will it wear out your brake and tires? How much should you expect to spend each time you go to the track?