modifier

My dealer has told me a few times that the Porsches in the US are about the cheapest sold. China, Dubai, Russia, they pay at least twice as much for the same car. So it's not surprising that Porsche thinks of those markets. It is surprising that we still get quite a few cars.

wanna911

That's not the issue. Porsche never would have warrantied such things (out loud) though the dealer network from what I have seen is far more forgiving than the internet. Our local dealers actually perform track preparation.

The issue is them building a car, touting lap times, advertising it on the track with videos and pictures, and then banning one of the primary things that goes along with tracking. Track tires.

The question is why, not that there is a legitimate answer, but it's still a downgrade from previous generations because they never came out and said NO SLICKS.

I bet you a manual 991 GT3 on slicks with no PDK and no RWS would be significantly faster.

Tacet-Conundrum

Its PCCB with traction control.

kosmo

The vette is looking more interesting.

Time to get out the gold chain and pinky ring.

chsu74

This is because of import tax and does not affect Porsche bottom line. The Chinese government collects the difference.

Petevb

For technical accuracy, you should start the following statement with "I suspect". There is no proof (yet, that I've read) that Gs are the reason Porsche has said no slicks, and there are alternate explanations. Just trying to keep the line between opinion and fact clear.

RobSpyder

Is this "no slicks" stuff actually published somewhere?

wanna911

What other viable options are there?

This is not tire size related or they would have said no 3xx/xx/20 tires on the car.

The only viable reason to single out slicks is grip. Otherwise there is nothing a slick offers that other tires dont.

What am I overlooking?

Mike in CA

Bob mentions it in the first post in this thread. No facts since, a lot of speculation; some of it reasoned, some of it not.....

^^This. 6 pages full of conclusions and assumptions with VERY few facts.

911dev

Hasn't the current 9A1 been run on slicks by one or more teams already? I recall seeing .2 Carrera turned race cars at the track. That said, how would the 991 gt3 have any oil starvation issues given its true dry sump v. integrated sump and host of other race proven parts (gt3)?

Petevb

For example, I suggested one possiblility back on page 2 here

I can think of a few other possible reasons. I'd actually be a little surprised if this is simply a G loading issue, but that's only an educated guess.

wanna911

A suggestion or recommendation does not sound like what this is. Slicks will cause issues with almost any stock suspension. As evident in the reported changes Porsche made to the RS they ran in the 24 hr. Porsche would not be responsible for any issues.

Porsche recommends new caliper bolts with every rotor change. This does not sound like the same scenario.

Nizer

All speculation but viable options that come to mind (some of which you've covered) include:

- load factors exceeding capacity of RWS and/or center-locks
- slick grip levels wreaking havoc with PTV and/or eDiff algorithms
- simple CYA exercise from legal designed to cover them from a liability standpoint and/or dissuade owner's from aggressive tracking

Petevb

Perfectly valid opinion.

Personally I'll wait until we at least see Porsche's statement in writing before commenting further on what this sounds like. Like I said, just trying to keep opinions distinct from and facts.

wanna911

Thats what I was saying. Pete is talking about things not caused by the grip of the slicks.

Your third reason as a scare tactic could be a possibility. But this seems a bit extreme. They had to find something out from trying.

For a company that claims that 80% of the owners of this car track them. This is a travesty.