frayed

Is the warning in your manual?

Quikag

Rumor has it is due to the rear-wheel steering.

Macca

Its in the motorsport supplement which comes with the manual in the wallet IIRC. It may also be refereed to in the main manual. It specifically says "slicks". Downunder slicks are generally treadless race tyres and non Dot rated....

FLM911

So its in the ROW motorsport supplement as well as the USA one...

tmg57

No. The language appears in the 911 manual, as well (Page 3).

"The fitting of racing tires (e.g. slicks) for sporting events is not approved by Porsche."

Quikag

Okay, scratch RWS being the issue then.

Macca

Its in the ROW manuals too, but in this day and age Porsche do little tailoring for specific markets especially for policy which is generally driven by the States market (a good thing for us ROW owners sometimes as your market forces accountability!). Of course sometimes is backfires like sports seats!

With the 991 GT3 the only differences this time appear to be with the rear number plate cut out in the bumper (why did they bother making a US variant of this?) and the amber side markers (USA legislation I suspect). Otherwise we are as close finally as to receiving the same car across the world....

TRAKCAR

I hope this is not a first step to the "You tracked it; No warranty" bull****.
Suncoast goes way beyond usually; They are at the track all the time and they are the good guys..

frayed

This is my question. WTF is 'racing tires'. They use (e.g., slicks) as an example, and I think one can make the argument that DOT R tires are not slicks. However, the way it is written, it implies that 'racing tires' is a broader term that includes slicks.

Macca

Its vague I agree but the first time I read it to me it meant non road complied racing tyres (i.e. slicks by want of another term).

The car is supplied on Dot rated R compound classification rubber. To supply the car this way and imply it can not be used with its standard equipment doesn't make sense. The race track videos used to promote the car show it running MPSC2.

In Downunder Land, to recieve insurance at the track you car must be registered for the road and have street legal tyres. The legislation states street legal tyres are tyres that must carry a minimum of Dot standard. We can use Trofeo, MPSC, R888, Z221 all day long. Swap over to an R6 or a Hankook Z214 and you are no longer road legal....

kyrocks

Hoosier R6 are DOT rated. Do they void warranty too? Come on.

Macca

Sorry, I made a mistake with my non Dot examples in my previous post as both R6 and Z214 are Dot. I couldnt think of any models of non dot "slick" tyres (Ive never used them).

I think with ROW if it has a 1-2 grooves it can be complied as an Dot rated tyre. If it has no grooves it cannot. This rule applies in UK, Downunder and Europe I believe. Im not familiar with Hoosier but it may be like Z214 hand have a couple of straight grooves and thus can be Dot complied - however I would suggest that Porsche consider this a "race tyre". I know in my neck of the woods its as close as you get to a Michelin racing slick used as a control tyre in the Carrera Cup series etc...

frayed

Bingo, that's my question. R6 A6 Goodyear RS. All DOT rated but a whole mess of grip.

This is DOT R.

Macca

Righto. Got you now. I think Porsche would call those slicks. However technically they arent.....

930man

I think the slicks are to much for the tiny belt driven motors that give us 3 deg of rotation...