What is the proper tire pressure for Michelin Pilot Sports on a 99 convertible?

 

I don't have a vert but my 97 coupe with Michelin Pilot Sport ZP I keep 30psi in them.

 

30 psi.

 

30 psi spring and fall....
With the hot roads in summer I drop to 28 cold.... but that is just me...
the door plaque says 30 psi all around

 

100% 28-30 is optimum and in the summer, 28 will get you 32-34 HOT. Best optimum pressure for best wear and daily traction.

Track,,,,drop it to 23-25.

BC

 

Depending on ambient temperature...whatever it takes to get it to 30-31psi hot...for me that would be 27 in summer and a little more in the fall and winter...

 

my question is the same, i understand the door sticker but thats for stock tires that come on the car, I've always been told to go 5-10 lbs less than tire recommendation. is there a difference when you are running run flats compared to non run flats? When i use to work at town fair tire in CT. we always told people that you wanted the tire to look flat (even) across the top of the tire and that would give you even wear. of coarse that was a long time ago.

So I am in the same situation with this question. I am putting on GY gs-d3 tires that are stamped for 51 max hot so in thinking you'd want it around 38-42 which leaves allot for temp but also if the pressure is low it does effect your MPG.

Any thoughts from the experts would be greatly appreciated.

 

30---THIRTY----thirty----40 minus ten=30---

 

So I am in the same situation with this question. I am putting on GY gs-d3 tires that are stamped for 51 max hot so in thinking you'd want it around 38-42 which leaves allot for temp but also if the pressure is low it does effect your MPG.
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If you follow this line of thinking, you'll KILL a good set of tires and learn a new lesson.

 

its not just you, some of us are much smarter than others.

 

The tires manufacturer makes little difference

 

Fixed it for ya

It would be great if ET chimed in on the "30 hot thingy...actually (30-31)hot...

 

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If you are going to put 38-42 psi in your tires I think you will even get better mpg if you put in the max of 51 psi...

 

Yello95, I didn't post that!!!!!!!!!! It was posted in a previous Post. Go back up and read post #7, ok?

 

I don't know if it makes alot of difference but I'm running 32psi in my new PS2's. I ran 30 in my Goodyears and I can't really tell the difference with the additional 2psi for basic/normal driving (whatever that is?).

 

...my bad....I just fixed it...

 

2 pound can make a difference... but for most people , the advantage is not worth the effort... when I say that NASCAR does tire tuning at the track.. I was saying that to show that there is an advantage. if your tires get too hard ( because of road temps increasing psi ) it can make a difference down the road.. here is an example for you... My first set of tires went 45,000 miles, I use tire tunning.. I posted this way back in 2005, all four tires wore evenly and when I repllaced them fronts has 3/32 left and the rears had 2/32 left... I am not an agressive driver but I like to have fun espeically in the clover leafs, and launching onto the freeway... have a perfect contact patch gives you the best advantage for cornering, mileage, braking, and tire longevity.. tires at 500 dollars a pop might prompt some people to get every driving mile 0ut of them. IM just trying to tell people they can make a difference watching their tire pressure... for most of us these cars are summer cars... if your area sees 90 + temps in the summer, and you drive on Black top roads. it would be to your advantage to take a peek at your actual tire pressure one day when its 95+ and your on a black top road... if its 36/37/38 psi, you are just burning rubber.. a simple adjust ment one time can pay for your efforts in real savings.. Most here who have followed this guide line are setting their cold temps to 26/27 psi when its in the 90's, the more over 30 psi when hot the more your wasting your hard earned money.. there is no advantage to high tire pressure other than show boating... with a reduction in tire patch area the rear tire spin much more easily.. if you thing that is cool that is great, but you are erasing the center of your tires and that can get expensive, Ive seen guy destroy their tires in under 10,000 miles, and to think , I got 45,000 miles out of my first set.
The End
Bill aka ET

 

thats what I'm talkin bout...classic ET

 

Then why does GM tell us that it should be inflated to 30 psi COLD instead of hot? Why not just tell us that it should be 30 psi HOT, we're not morons, we would understand that, if we know how to operate the vehicle, we should be smart enough to understand what 30 psi HOT would mean. Geez, give us a little credit!

 

The sticker is known internally as the Idiot proof sticker...so many people where inflating their tires to the max pressure found on the sidewall, the sticker is there for product liability and compliance. I'm not forcing this down your throat... 30 psi will work whether you are in Bismark North Dakota at -10 F or in the Arizona desert at 115F. Give you a little credit? you have no idea what the average drivers will interpret things. They buy oil that says 15,000 mile oil, and they drive 2000 miles a year so they dont change their oil for 5 or six years and want GM to back their blown motor. We design things at GM using a process called FMEA.. Failure Modes Effect Analysis, part of this process is trying to determine exactly what the consumer will do with this design, push this outside its design limits etc.. Just look at the credit you speak of.. do a search on people putting 44 psi in their tires because is says so in the sidewall. You see one of the nice things about this forum is that we can fine tune your car for the conditions you see in your area. We on the other hand have to design and build a car that will operate safely anywhere in the world. There is nothing wrong with you questioning me.. If it gives you pleasure to post a commentary based on you opinion and mechanical expertise and feel it is logical, I am very happy for you putting me in my place.
Thank you for your thoughts
Bill aka ET