Steph718

Hello all,

Taking my Spyder to the track this weekend for the first time on PS4S with maybe 2,000 miles on them. I know these aren't ideal for the track, however I don't plan on taking this car to it's limits, just want to have a little fun without the law involved or being worried about crossing the double yellow and see what she can do.

Anyhoot was curious to know what guys are running these tires at cold/hot. I've read a few times from the 911 guys that 35 hot appears to be the sweet spot, with some of them running 1-2 psi difference front and rear. Any advice on tuning under/oversteer with pressures would be great too!

My camber is currently set to -1F/-2R

Thanks in advance!

rockhouse66

I relied on the track rats in my local PCA chapter to advise me on this and they suggested I start in the 26-28 range and check them hot after a session. I was frequently letting air out over the weekend and never did really see signs of the tire rolling onto the outside edge.

Steph718

What were you getting up to hot?

dps214

If you're not going to be pushing the limits just leaving them at the stock pressure is fine. Maybe drop a couple of psi to account for heat buildup but it basically won't matter.

Steph718

Probably the best advice I'll get all day, was thinking just go out at 30psi - the "comfort setting" and have at it. I just keep reading about this soft sidewall business and I'm not exactly running a lot of camber up front. 1 degree is pretty much a joke compared to my last car.

Ernest72

As a general rule you start to lose grip at pressures higher than 36 psi. So I would start in the 26-28 range and see where your pressures are after your run. On the street my car is at 30 psi in the rear and can get to 35psi in the summer after some spirited mountain runs.

rockhouse66

I didn't keep notes but I think the pressures rose more than I expected when hot - like 4-6 PSI. I was doing a lot of sliding around and will soon add the Tarett LCAs up front to add some camber.

toma nova

34 hot.

Start at street pressures then check after each session and air down to 34, immediately after coming off track. Depending on how hard you push, you may need to air back up for the drive home at the end of each day.

Squeaky

32/34 hot front/rear is near when you should have it. Maybe 1psi less on both. That said you *may* need to compensate the front with higher pressures due to the low camber.

Squeaky

Also, monitor your tires through the day. Seeing it’s your first time, it may be fine, but these tires will delaminate in certain track/driving conditions.

981SPcar

I absolutely would not leave them at the stock pressures. Buy a tire gauge and check them in the morning and again when you get to the track. You can gain 3-4 PSI just from highway driving. If anything, set them to what you what them to be hot once you arrive. Then run your first session and check after that. I dropped mine to 25 front, 26.5 rear recently to achieve 31 front hot and 32 rear hot. 80 degree day at Thompson speedway. I dropped pressures every single session as the ambient temp went up. This was my 4th day at this track and my 8th day in general. If you're running novice with an instructor you could also discuss with them once you check in and meet up. If you are novice group the first 2-3 sessions will be pretty slow and the 4th/ 5th sessions should be quicker and likely when tire pressure will play a bigger role.

Ziggmeister

I used to aim for 34-35 hot, that's most of the advice I found online. Recently I started to notice that the grip seemed to drop after the first 2-3 laps, so then I started aiming for lower pressures, 30-31 hot. But I've also had these tires for a year's worth of track days, which likely plays a role here. I think any of these are decent starting points. If you feel the car starting to get a bit slidey towards the end of a session / in the afternoon when it's warmer, drop the pressure a bit. And buy a 12v tire inflator, I didn't have that for a few hot weekends and ended up at < 25 psi the next morning at the hotel, and had to drive back to the track significantly under-inflated.

Kitc2246

OP how was the track weekend? You are on the slippery slope toward a dedicated set of wheels and track tires. A hauler and enclosed trailer is at the end of the slope along with a Club Sport.

I only run my PS4S when its really cold/wet. Hankook RS4s are my track tire. I find that the PS4S start to get "greasy" at 36. Depending on the temp start at 28 aiming for 34 hot. At the end of a track day you almost always need to add air or you will be extremely low the next morning. I normally get TPMS messages which if I add air at the end of the day go away the next morning.

OP your Spyder has adjustable LCAs. You will need a spacer to get a large negative camber. I run -2.8 on my Boxster S which keeps me from burning off the outside edge of the front left. Its a balancing act depending on how many DD street miles and track days on how much camber to add. A large number of street miles will wear the inside edge of both front. I drive my car on errands and short weekend trips with the Hankook RS4. The tires heat cycle out before the tread completely goes. The rears actually wear out first with my front negative camber.

Squeaky

I recently put these tires on for a wet day. The day dried out a bit and initially I was a bit surprised how progressive the tires were (it’s been a while). After pushing a bit they just became a hot mess and my lap times were waaay down from what I remember these tires could do. After some inspection, it may have something to do with them being as old as 7yrs… 😅