Excessive rear tire wear.....?

[Retroman1969]

Honestly, because its a high milage daily driver and I was at least partly aware of the tire wear issues of Boxsters, I put on a cheap set of tires last time. (Primewell Performance... house brand of Hibdon's Tires). They were $288 for the complete set installed including tax and lifetime hazard protection. I've been pleasantly surprised. They perform and ride extremely well, and apparently wear normal to above normal.
This way, it won't be traumatic to replace a pair of tires every 10 months or so.

[Topless]

If you run a quality A/S tire with a 400 TW rating you may get 40k miles from them but the tradeoff is less glorious road grip in the canyons. For some this is a worthy trade but since I only put around 5k on my car annually I want MAX grip. I can't wait to put on a nice fresh set of sticky tires every year. Woohooo!

[stelan]

So what would the oem tire recommended pressure front and back? 99' 986

[rah rah 986]

I am needing to replace my rears for the third time since I bought the car which had good tread all the way around. The fronts are still what the car came with and look fine. I've gotten no more than 8000 miles from a set of rears. It is always excessive wear on the inside. Ive read that this is normal alignment for best tire to road contact. But, I would be willing to trade off some of that in order to get reasonable tire wear.

[kk2002s]

-- So what would the oem tire recommended pressure front and back? 99' 986 --
I believe it's 29 front 36 rear. Many here vary these up or down a pound or two

-- ... I've gotten no more than 8000 miles from a set of rears... --
That is pretty bad at first thought but what kind of driving and what tires.
I replaced summer rears (wore as expected with neg. camber, insides most) after 25k miles of my miles. They came with the car from PO. I may have taken 5k to far only in the sense of wet road driving.
I'm 32k on the fronts, will replace this spring, and again probably 5k to far, again only wet roads

Both fronts and rears wear the insides the most (neg camber)
As stated above, if you took out the neg camber and went with harder tires, you could get longer life. BUT you would sacrifice handling - Whats the point

[thstone]

This is an example of excessive tire wear - down to the cord in ~250 miles.

Of course, 50 of those miles were spent pulling 1.4g in corners at 90-130mph.

[Retroman1969]

Yikes! LOL!
Well they died doing what they love!

[JayG]

my right tire after 2 track days. It was almost brand new!

[Finnegan]

Originally Posted by JayG

also the factory tire pressures are calculated to add understeer

That's interesting. What would be the correct pressure if I wanted a little more oversteer?

[BoxsterSteve]

Originally Posted by Finnegan

That's interesting. What would be the correct pressure if I wanted a little more oversteer?

I bumped my fronts up to 32psi. The don't scrub off as hard with a bit more air in them.

[JayG]

^^^
Increase front tire pressure and maybe decrease rear

I run 32 F and 34 R cold that ends up being around 36 & 38 hot

[Nine8Six]

Originally Posted by JayG

my right tire after 2 track days. It was almost brand new!

I see a very slight cold tear which is an indication that your tire was slightly over inflated. Hot tear is the opposite. I also see raised 'back' edges on the treads. Your shock rebound is incorrectly set (too fast) (or dead toasted). When the leading edges are raised it would be an indication that rebound is set too slow.

(we learn how to read tires in the pits when bored, really bored Jay)

I will put you in touch with my mates at Ohlins in Sweden. Please prepare $3,800 per wheel. This will save your tires on your upcoming and future track days

ps: I'd trade some tires regardless for a good track day, any days. Crappy Porsche suspension or not! Let's do this lolll

[Nine8Six]

... and I think I'm reading your tire the other way around, correction; it would be the leading edge in that case. (tired, late, just came bk home, going 2sleep now, bye bye!)

[JayG]

Interesting stuff Fred.
tell us more

My suspension is bone stock. Im looking at putting a USA M030 in so I can still run in Street Stock

[Nine8Six]

Originally Posted by JayG

Interesting stuff Fred.
tell us more

My suspension is bone stock. Im looking at putting a USA M030 in so I can still run in Street Stock

Sorry Jay, just took out the dogs for their walk. Nah mate, nothing wrong with the tire you posted.

PSI: Undefined really. Best to talk to your track-side 'aware' tire manufacturer for the baseline really. If you do regular track days then sadly you got to learn the visual difference between cold/hot tears so you can adjust your psi for both ambient temp & driving style through your days. Remember, you are more aggressive in the afternoon when the ambient temp (and track) is much hotter than cold morning. I often have a good 4~6psi difference between morning and afternoon session/race. 4psi is often just enough to ruin a tire within 3 hot laps (road rashes aren't kool loll).

Other factors also, tire compound, types, treaded/slicks, etc. Friggin science almost :/

Won't go in details RE rebound, compression, spring load, etc. Sure the Internet can teach you all about dialing your suspension. That only is you use adj coilovers (PS9?, Ohlins, etc etc).

ps: Got the M30 here, new, 4 years old only (ROW I think its called, forgot). Awesome kit (and affordable) for the street and occasional track day I've heard. Bit stiff over road bumps Go kart stuff man, you won't regret

[Fintro11]

tons of life left!

this is what happened to my supersports after a year of driving ( I usually drive about 10,000 km a year) very bad alignment >.<

I try to get an alignment one a year now, my current supersports are two years old now with lots of life left




when the rear starts kicking out in the rain is when they need to be replaced haha

[particlewave]

I just bought a full set of 4 Sumitomo HRZlll's. I've read good things, so I'm hopeful

[Retroman1969]

Originally Posted by Fintro11

tons of life left!

this is what happened to my supersports after a year of driving ( I usually drive about 10,000 km a year) very bad alignment >.<

I try to get an alignment one a year now, my current supersports are two years old now with lots of life left




when the rear starts kicking out in the rain is when they need to be replaced haha

Wow, that's exactly what my previous set of tires looked like on this car! That's when I had the alignment adjusted to be more neutral.