The Kumho tires are quiet but squirmy

[Flavor 987S]

Are the 4 tires matched? Never mix tires on a performance sports car.

How many miles on the new tires? It takes about 200-500 miles to scrub off the mold release tire manufactures use in production, this was covered in the product information you received with the new tires. Did you read it?

I suspect your tire pressures are low. Your cold pressures should be more like 32 front and 36 rear.

Were the tires road forced balanced? Alignment completed?

[Idaho Red Rocket 3]

About a year ago I needed to change the tires that came on the car when I bought it. My tire dealer talked me into Continental DWS. Great traction in all conditions but terrible, I mean terrible for what a Boxster can do. Understeer like crazy and no high speed stability. Fortuneatly they came with a love them or leave them warranty. Well after some intensive on line research, I replaced them after a few months with Kuhmo ASX. Let me tell you about that tire. WOW !!!! They do everything a Boxster can do. Or at least everything I can make a Boxster do. Yes they did have that wiggle squirmy feeling for a short time at first. That went away quickly.

As much as I hate to buy off shore tires ( Go figure that one out. I own 2 Porshes and several motorcycles made off shore.) I realy hate and won't buy Chinese and I'm not to hot about Korean stuff either, but I have to admit the Kuhmo ASX to me is an awsome tire.

[mikefocke]

cupping might have been an alignment issue, did you have that addressed by a Porsche-knowledgeable shop?

[Dale_K]

Haven't done an alignment yet. I have some hope these tires might improve a little as they wear. Skinny tread blocks and full depth tread can create squirm. I think racers shave most of the tread off tires to improve handling.

Still looking for tire pressure advice to reduce understeer.

[Topless]

Ok Dale, we can probably help you sort this out. Start at the beginning. Are these the tires you just put on the front?
http://www.tirerack.com/tires/tires.jsp?tireMake=Kumho&tireModel=Ecsta+LX+Platinum&partnum=245WR7ELX&vehicleSearch=false&fromCompare1=yes

What tires are on the rear (exact make model and size)?

As long as the tires are very similar in type, temperature, traction, and wear ratings, even different brands, they should work together pretty well. If there is a big mismatch in tire compound no amount of air pressure or alignment changes will get them to work well together.

[Flavor 987S]

Originally Posted by Topless

As long as the tires are very similar in type, temperature, traction, and wear ratings, even different brands, they should work together pretty well.

I disagree. This is horrible advice. Especially for a performance sports car and a Porsche.

[Flavor 987S]

Dale, what are the code dates on the front tires? What about the dates on the rears? This will tell you a lot too.

[Topless]

Originally Posted by Flavor 987S

I disagree. This is horrible advice. Especially for a performance sports car and a Porsche.

Sorry Flav,
I guess we will just have to agree to disagree. Been doing this for 5 years, street and track. Michelin PS2, Mich Pilot Sport, Sumitomo, Goodyear, Nitto, and Hankook. I currently have 5 sets of tires in various states of shred and 3 sets of wheels.