Summer Max Performance Tires - 986 Forum - The Community for Porsche Boxster & Cayman Owners

MikenOH · 12-16-2005, 09:37 AM

I guess my experience with a set on a E320 MB a few years ago really colored my view of the company and the products.

These tires were standard on the E320, wore quickly, had repeated belt failures and traction--dry or wet went south after about 20K miles and this was highway driving. I was mazed MB would put them on a $55K car--sort of like Ford and the tires on the Explorer, but not to that degree.

Anyway, other forums--Pete's, Renntech and the tireRack-- have lot's of comments on continental performance tires, probably the previous version, and none was good. IIRC, the consensus was not very responsive handling, average traction and loud after a they started to wear.

I understand the C2 tire is better than the one it replaced. Having said that the Tirerack comparison of Max summer tires has the C2 around 10 or worse. It may not be a bad tire but there are others out there that are better. A lot of it would depend onthe kind of driving you do; if you're just cruising, you might not notice much of a difference between the bunch except for noise and ride quality. of course, YMMV..

Adam · 12-16-2005, 10:26 AM

I checked out the Michelin Pilot cups here http://www.tirerack.com/tires/tires.jsp?tireMake=Michelin&tireModel=Pilot+Sport+Cup&partnum=24YR8SPORTCUP&partnum=635YR8SPORTCUP&vehicleSearch=true&place=7&index=7
just to see what these things cost for a boxster. They are not that much more than PS2's so that got me thinking. Why not get these instead of PS2's because I do auto-x events and I rarely if ever drive in the rain. Well then I found my answer. The Cups have a wear rating of 80 and the PS2's have a wear rating of 220. Does this basically mean then that the Ps2's will last almost 3x longer than the cups? I would love to have the dry performance that the pilot cups offer but I would't shell out that kind of cash for a tire that will only last 5-10k miles tops.

MikenOH · 12-16-2005, 11:00 AM

the PSC' are good, but they come shaved to 6/32 tread and are a softer compound than PS2's. You might want to get them heat cycled before hand to maximize their life.

I've heard these are a better track tire than auto-x because they take a while to heat up and are best when hot.

Victoracers are just he opposite; they get hot faster but can overheat at the track. There was a longish article on this either in Panorama or Excellence a few years back with lots of detail.

The PSC are different from a lot of other softcompund tires since they actually have tread on them, as does the Victoracer. Many R compound tires have no tread or just a groove or two around the tire.

If you're looking for a tire for both street and auto-x use, the Falken 615 has gotten some rave reviews as a good in-between tire; not R compound but better than a high [performance street tire. Also, Yokohama has new tire out which is suppose to be a s good or better than the PS2.

mjw930 · 12-17-2005, 05:08 AM

Be carefull and consider want out of the tires. Everyone wants to jump on the PS2 bandwagon but for many, me included, they are not the proper tire for the Boxster if you want to maintain or enhance the balance of the car, especially at the limit.

The PS2 is part of a new breed of tire that attempts to increase the comfort level while still maintaining reasonable directional stability and precision. This results in a tire with a hybrid sidewall construction that can work very well in some applications and horribly wrong in others. I have found that the Boxster is very sensitive to sidewall construction and doesn't really like the PS2's in the 18" configuration (you didn't mention the sizes you are shopping). Although the highway ride was very nice and the absolute grip these tires produce is excellent the loss of precision upon initial turn in and when they are subjected to varying side loads within a turn makes the driving experience less enjoyable for me. I switched back to the PS Rib (Pilot Sport N1) and although the ride is harsher the handling and feel of the car is much more to my liking. The overall grip is still very high and I find that I don't lose anything on the track or at the autoX.

You might want to consider the tried and true Bridgestone SO3's. They have been the standard bearer for many P-Car owners who track their cars regularly for the last few years.

MikenOH · 12-17-2005, 07:29 AM

do you think this due to a softer sidewall? I haven't driven my car with PS2's enough to get a feel for steering response relative to the Kumho's I had on the '99' but when I went from the Michelin MXX3 to the Kumho, I immediately noticed the less immediate response to steering inputs.
The ride was softer in the Kumho's and it still had lots of grip, but the "hardwired" feel of the MXX3's was not there.

A good friend that used to be a Goodyear tire engineer explained all the compromises you have to make, depending what you want the tire to do for you. I'm wonder if the loss of turn in response is a result of getting a softer ride.

Adam · 12-17-2005, 08:40 AM

I like the initial turn in on my PS1's. Are the PS2's less responsive than the originals? What do you guys think of those Yoko Advan Novus tires?

Ghostrider 310 · 12-17-2005, 08:54 AM

Great feedback from everybody, I made a mistake in my post in identifying the Michelin tire. I'm looking for max performance street use only. I was shocked to see C&D magazine choose a Goodyear product. I have always found the Pirelli's and Michelin tires performed very well. Things have certainly changed, it sounds like that Yokohama product is a great choice now. I was surprised the Michelin pilots didn't score better in the comparison. My '98 has the optional 17' wheels, it's a non S 2.5L.

mjw930 · 12-17-2005, 06:44 PM

Quote:

Originally Posted by MikenOH

do you think this due to a softer sidewall? I haven't driven my car with PS2's enough to get a feel for steering response relative to the Kumho's I had on the '99' but when I went from the Michelin MXX3 to the Kumho, I immediately noticed the less immediate response to steering inputs.
The ride was softer in the Kumho's and it still had lots of grip, but the "hardwired" feel of the MXX3's was not there.

A good friend that used to be a Goodyear tire engineer explained all the compromises you have to make, depending what you want the tire to do for you. I'm wonder if the loss of turn in response is a result of getting a softer ride.

In a nutshell, yes. The Kuhmo's are known to be a softer tire, that's how they were engineered. The PS2 has a very soft sidewall as well but to be fair, the sidewall in the PS2 is very sophisticated, it's not simply softer. It's designed to combine the softer sidewall with an outside tread density that should allow for very precise turn in and in the proper application the PS2 is a killer tire. I run a 17" version on my V70R and it transformed that car. The ride is superb and it can generate A LOT of corning force. To be fair, the suspension on the Volvo is geared for a softer tire so it takes the PS2's very well. The 986 suspension, OTOH is designed around a tire like the Yokohama AVS Sport, Pirelli P-Zero or the Michelin Pilot Sport 1 (derived from the MXX line of tires), all of these tires have a much stiffer sidewall and less tread squirm than the PS2 and certainly more than the Kuhmo's.

If you care about staying with an N-Spec 17" tire then the Michelin PS Rib (N2) seems to be the hot ticket. If you want to try something a little more geared for street/track then I would seriously consider bumping the fronts up to 225/45's and look into Bridgestone Potenza S-03 Pole Positions or the new Yokohama ADVAN Neova AD07.

With all that being said there are a lot of people quite happy running the Kuhmo MX's in 17's on their Boxsters but I doubt they are tracking the car reguarly OR they do track it and got tired of paying $200+ per tire after destroying them on the track in one season.

MikenOH · 12-19-2005, 09:33 AM

Regarding dedicated DE tires, I've drive the MX on a track and it's clear the tread needed to be shaved. One magazine that tested the tire put it right up there with the BFG KD in a short auto-X course with shaved tread. When I drove it on a 90 degree day, the tread was getting greasey after several 1/2 hour sessions but when I got it home the tread wear was uprisingly minimal. I'm thinking that if the tread was shaved to 5/32 there would be more traction, less heat from squirm and less tread flaking off.

What i'm thinking about is going with 17" tires for DE's on a 987 for $ reasons and using a shaved tire like the MX or G force Sport because they do give good performance--as opposed to great--cheap to replace (Est. $120/tire) and can be flipped if one side wears. Also, since I have to drive a good ways to a track, I'll actrually have a tread pattern in case I get caught in a shower.

TR has quoted me $100 to shave a set so a delivered MX set would be around $650

steven · 12-22-2005, 05:34 AM

Quote:

Originally Posted by Adam

I checked out the Michelin Pilot cups here http://www.tirerack.com/tires/tires.jsp?tireMake=Michelin&tireModel=Pilot+Sport+Cup&partnum=24YR8SPORTCUP&partnum=635YR8SPORTCUP&vehicleSearch=true&place=7&index=7
just to see what these things cost for a boxster. They are not that much more than PS2's so that got me thinking. Why not get these instead of PS2's because I do auto-x events and I rarely if ever drive in the rain. Well then I found my answer. The Cups have a wear rating of 80 and the PS2's have a wear rating of 220. Does this basically mean then that the Ps2's will last almost 3x longer than the cups? I would love to have the dry performance that the pilot cups offer but I would't shell out that kind of cash for a tire that will only last 5-10k miles tops.

I also beleive that they have much less tread depth. That, and the quick wear will keep me away from them, although i would love to get them ($ issue is stopping me).

MikenOH · 12-22-2005, 06:49 AM

After chasing after every 987 tire/wheel set on ebay that I came across, I think the best deal I've seen is a set of Mille Miglia Cup1 wheels with either MX's or G-Force Sport tires from Tire rack.
The Wheels run about 3lbs heavier per wheel than the stock 18"s but an set of 4 with the tires mentioned shaved to 5/32, balanced and delivered runs $1400-1500.
I'd like to have lighter wheels but for DE's I don't think this will make much of a difference. Plus, with a 7.5 " front, I can put up to a 245 tire on it.

Ebay just had a set of 987 17" tire/rim takeoffs that sold with shipped for about $1250. Probably not a bad price but the 6.5" rim on the front limits what kind of tire you can use on the car. Look forward to hearing about the 615's.

mjw930 · 12-22-2005, 06:29 PM

One thing you might also want to consider is the class or PAX rating your car will get at an autocross with "R" compound tires. Going with the 615's or any other tire that has a wear rating greater than 200 means you can run the stock classes or at least get a lower PAX rating.

Of course for DE's it's irrelevant.

mjw930 · 12-28-2005, 03:45 PM

I just got the 615's on my track wheels today, here's my first impressions.

The tires are not terribly loud and seem to have a very strong sidewall. The steering input is very precise with little tread squirm and a low slip angle. They are new and I haven't heat cycled them other than the one run home but their traction seems to be very good with a very linear breakaway. I won't know for sure how well they work until the next auto cross but so far I like

Oh, and the tread pattern really looks good on the car.......