991s track usage
#16
Good info shared by track guys here. I have taken my previous e92 M3 to the track a few times but I have yet to take my C2S to the track. Other than covering the basics (SS brake lines, pads/rotos, tires), the 991 seem to be pretty solid for occasional track days. I am looking forward to it. Thank you all for sharing helpful info.
#17
Question on 19" 255F 305R tire sizes
Hello,
I noticed that someone mentioned running 19" tires in 255F and 305R sizes. Couple of questions -
1. Since these are not the factory 19" tire sizes (which are 235F and 285R for C2 models), which dash setup do you use for setting the tire diameters? (I.e. The 19" or 20" settings)
2. Have you noticed any ABS or PSM issues or error codes?
Coming from a 997 previously, there was a suspicion that using tire diameters other than the factory setup could cause ABS or PSM issues - the infamous "ice mode" brake feel.
Please let me know if you always disable PSM when using these tires. Or if not, have you experienced any PSM issues?
THanks,
- Sanjeev
I noticed that someone mentioned running 19" tires in 255F and 305R sizes. Couple of questions -
1. Since these are not the factory 19" tire sizes (which are 235F and 285R for C2 models), which dash setup do you use for setting the tire diameters? (I.e. The 19" or 20" settings)
2. Have you noticed any ABS or PSM issues or error codes?
Coming from a 997 previously, there was a suspicion that using tire diameters other than the factory setup could cause ABS or PSM issues - the infamous "ice mode" brake feel.
Please let me know if you always disable PSM when using these tires. Or if not, have you experienced any PSM issues?
THanks,
- Sanjeev
#18
Intermediate
I bought the rear rotors thru Amazon. Sols Brake Supply. Search "Sebro Sport Slot" Part # for 991.1S are 909323 and 909324. You would want to confirm your 2017 .2 uses the same rotor as the 991.1. Probably best to call the listed vendor and confirm part # before you order.
#19
Instructor
Thanks for the feedback
#20
Rennlist Member
I have tracked my 2014 991S since new and average 15-20 track days a season. OEM brake pads did not last long for me. I am a late-braker! I upgraded to Pagid RS 29 pads and Motul 600 fluid. OEM rotors crack easily but actually last a pretty long time. The fractures rarely extend hole to hole. As for tires, I have been using Michelin Pilot Super Sports since I drive to all my events. These have worn extremely well. I go through a set of pads and rotors each season. I got a season and a half on my last Michelins.
#21
Drifting
They are pretty squeaky. I once scared a lady in a crosswalk into thinking she was about to be hit by a bus. That squeaky. Seriously, not ALL the time, but often. IMO, you can't have it all. I change my pads for every track event.
#22
Rennlist Member
#23
Rennlist Member
I'm been tracking for 20 yrs, but mostly in BMWs.
I just took my '14 991S to the track for the first time. Prior to going I put on some Girodisk front rotors. The rotors were sized in a a way that allows me to use 991 GT3 sized pads (they drop right into the front calipers). I went with some stock GT3 pads and they worked out fine for two days of tracking at Watkins Glen in the instructor group. The didn't have the bite of true race pads, but lasted just fine with no fade.
I did some some high oil temps on extended (30mins +) runs. I saw up 270F on the oil and will be installing a 3rd radiator before the next trip to the track.
All things considered it is a great track car right out of the box....Porsche did a great job with the 991!
I just took my '14 991S to the track for the first time. Prior to going I put on some Girodisk front rotors. The rotors were sized in a a way that allows me to use 991 GT3 sized pads (they drop right into the front calipers). I went with some stock GT3 pads and they worked out fine for two days of tracking at Watkins Glen in the instructor group. The didn't have the bite of true race pads, but lasted just fine with no fade.
I did some some high oil temps on extended (30mins +) runs. I saw up 270F on the oil and will be installing a 3rd radiator before the next trip to the track.
All things considered it is a great track car right out of the box....Porsche did a great job with the 991!
#25
Intermediate
Hello,
I noticed that someone mentioned running 19" tires in 255F and 305R sizes. Couple of questions -
1. Since these are not the factory 19" tire sizes (which are 235F and 285R for C2 models), which dash setup do you use for setting the tire diameters? (I.e. The 19" or 20" settings)
2. Have you noticed any ABS or PSM issues or error codes?
Coming from a 997 previously, there was a suspicion that using tire diameters other than the factory setup could cause ABS or PSM issues - the infamous "ice mode" brake feel.
Please let me know if you always disable PSM when using these tires. Or if not, have you experienced any PSM issues?
THanks,
- Sanjeev
I noticed that someone mentioned running 19" tires in 255F and 305R sizes. Couple of questions -
1. Since these are not the factory 19" tire sizes (which are 235F and 285R for C2 models), which dash setup do you use for setting the tire diameters? (I.e. The 19" or 20" settings)
2. Have you noticed any ABS or PSM issues or error codes?
Coming from a 997 previously, there was a suspicion that using tire diameters other than the factory setup could cause ABS or PSM issues - the infamous "ice mode" brake feel.
Please let me know if you always disable PSM when using these tires. Or if not, have you experienced any PSM issues?
THanks,
- Sanjeev
The OE tires are 26.8” front and 27.0” rear diameter and the RE71R are 26.0 and 26.2. Both with the same .2 difference front to rear.
So I’ll give them a try and report back with the performance and if I have any issues.
#26
991 is excellent on track. I track my GTS and the only thing i changed is the brake fluid/(SRF) and tires (PSC2's). I have PCCB and they are incredible on track. No noticeable wear after 8 or so track days. I'm planning my first track day of the season on the 22nd. Can't wait for some Lime Rock action.
#28
Burning Brakes
I just had all 4 tires replaced with the Pilot 4S's and also put in the Pagid RS 29s. Yes, they squeal. What I have found in the past is that if you have the ability to warm them up and do a few moderate to hard stops, it lessons the squeal for a while. Problem is on a daily commute, it's sometimes impossible to that that. I never had the yellows before and didn't' realize they could easily be seen behind the caliper. I think they look kind of cool sticking out behind the red calipers. Even though my rotors aren't carbon ceramic, apparently my driveway is, lol.
#29
Intermediate
I have used my 2014 4S for DEs since new. Like BradB said the factory pads don't last long but that's not surprising.
I run Cup 2's on my factory wheels when it's dry and PSS on Vorsteiner wheels when it's wet. I'm looking to go to 19's for dry use so I can run more aggressive tires.
I'm using Motul brake fluid and Pagid yellow brake pads. Pagids last much longer but are too loud for me to use on the streets.
I had GT3 lower control arms installed so I could get more negative camber since I was eating up new tires in a weekend. Since then I've gotten two weekends out of a set of Cup 2's and may get a third.
I run Cup 2's on my factory wheels when it's dry and PSS on Vorsteiner wheels when it's wet. I'm looking to go to 19's for dry use so I can run more aggressive tires.
I'm using Motul brake fluid and Pagid yellow brake pads. Pagids last much longer but are too loud for me to use on the streets.
I had GT3 lower control arms installed so I could get more negative camber since I was eating up new tires in a weekend. Since then I've gotten two weekends out of a set of Cup 2's and may get a third.
Did you add shims?
Thanks
#30