As my Pirelli OEM rears were shot and the fronts were still good I thought I'd try the mix and match with PS2s on the rear with the Pirelli fronts. It was OK until you pushed hard. In turn initiation the tires felt as though the sidewall flex was uneven and the car would load/unload the sidewalls even on smooth pavement. I tried adjusting tire pressures by as much as 8 pounds (front to rear) with no restabilization. Not a pleasant feeling while driving. May have been the choice of tires but I would not repeat.

 

What is going on? Mixing tires now? The number of nonsense posts is going up recently. Something in the air?

 

Whether the car is able to "know" or not won't matter because if one intentionally compromises the design purpose of four tires with matching tread -- the driver opens up an increased risk of being the first to find out.

 

the blindful trust from people about engineers, R&D and scientist is an endless source of fascination for me.

The Pirello Corsa system do exist. That is a fact. It's also the commercial answer to a need. It's also the irrefutable proof that a serious company thought that front end could have specific needs rear end don't. And vice versa. Which seems absolutely logical. Especially on a car such 911 with unbalanced weight distribution.

At least, at the very least... One can honestly question about that.

 

With all due respect, that is a good exemple of a nicely put empty phrase.

''intentionally compromises'' ?

How one could possibly know anything can be compromised without even knowing the results, without giving a try ? But, yes, if a test must be run to know... it's gonna be intentional!

We are not talking about some foolish-stupid experience here, we are talking about using different components, that works great separately, but mixed together. Your car won't explode.


''design purpose'' ?

The design purpose of ANY tires on the market is to be competive, within a precise market niche, and commercialy profitable. Regarding the high performance (niche) market i think that all R&D teams from all manufacturers are working very hard to produce the best tires possible... With the compromises we can easily imagine. I'm 99,99% sure that ''matching thread'' is not questionned, basically, for commercial reasons, not performance.
How much it would cost to devellop such F/R combo tires ? How limitating is for the sales ? How the customers would react to that ? Well... this thread gives an idea..


''matching thread'' ?

Do you have any scientific data that (any) front/rear ''matching thread'' is optimal for our specific car model ?


But, hey, thank you at least i received one feedback of someone who actually experienced it. Thanks for that.

 

Can you?

You ask what we think, and people offer advice.

If you don't want peoples opinions don't ask for it.

 

I don't have an extensive experience on tires, but i do about forums.

Opinions are always welcome, as long as i keep the right to select and reject if needed.
If i don't have that right, then it's not an opinion.

We are here to discuss, to exchange information, and maybe to find new way to do things. It's only a hobby after all..

 

Taking the car into unknown territory places whatever result of that test in the hands of the driver. To do so with full knowlege of an unknown result is deliberate and thus intentional.

This is your interpretation of the design purpose . Show evidence that you have to support that tire A was designed to be ideally "competitive" with tire B .

You are the one making this claim
"I'm thinking of using a differents tire front and rear, so i can get the best traction (rear) while getting the steering response i'm looking for."

Therefore the burden of proof is on you .

 

What the OP does not understand is that Weissach designed the car to be used with the same tire compound in the 4 corners. Mass distribution, suspension parameters, alignment and drive power are in a defined balance, assuming the same tread compound everywhere. That assumption is crucial. Within reason one can use a variety of tires but all must be the same to maintain that delicate balance. Use different treads front/rear and one can get exaggerated understeer or oversteer depending on the compound location. In addition I also think that Weissach's N-rated tires are the best tires for these cars. But what does Weissach know? LOL

 

By the logic in most of these responses one shouldn't ever add a different rear wing, nor a front splitter or nose. Drop the non-factory aero kits - all of these change the downforce of one end or the other, helping or hurting traction, turn in, stability, etc., yet clearly Weissach knew what it was doing and we can't fiddle with that!
And by extension it is a fool's errand to add a supercharger, wheel spacers, etc.

Spud99 gave one tire combination a try and reported the results here. I think it is fair to experiment with your car, and use what works for you. You just have to recognize that in a negligence claim you won't have Porsche or the tire mfgr supporting you (not that they would anyway).

 

I say go for it and let us know how it worked out.

 

I think something to consider here are N-rated tires. Since Porsche tests all these tires before granting them an N-rating, it would make some sense that these tires have similar characteristics. But some subtle differences may end up giving a better combo of fronts and rears vs. using same manufacturer as recommended by Porsche and the tire manufacturers.

Now the question is who is willing to try all these diff combos and who can afford to with the cost of these N-rated tires???