930man

a slick is a slick not approved dot tire a dot tire is dot tire I would fight to the death on this

911rox

Trofeos are no different to MPSC2s and the Dunlops... I'd say any treaded Rcomp tyre like the Trofeo and MPSC will be fine... Any slick like Rcomps like Hoosiers are considered racing tyres and would likely void warranty...

As I see it treaded R comps are good, slick Rcomps will cause one grief with warranty...

sunnyr

I wonder how Porsche will know if some one uses slicks and swaps them out? Record G forces?

ShakeNBake

I've raced on R-comps.....so.......what's a racing tire?

redleg321

What are you--some kind of lawyer???

tmg57

How many angels can dance on the head of a pin? Tires don't matter because all track activities are ex-warranty anyway.

Road Racin

Not true. Track action doesn't void the warranty on the 991 gt3. Old 997 manual said it would. New 991 doesn't mention it so that means it's ok. This was discussed

tmg57

Missed that discussion. Can you send a link?

BBMGT3

i really think its quite straightforward

racing cars / Cup cars = racing slicks, from endurance slicks to sprint softs
road cars / track cars = DOT approved tires, R-compounds, road tires, anything that can be legally driven on the road

yes, in some cases there is an overlap between one and the other. a cycled out, worn endurance slick will be slower than a brand new trofeo R. But like someone already said, this is most likely to just cover bases and scare customers off from turning their 991 gt3 into a race car

fyi, 991 Cup is fraught with issues. 2013 car is a disaster. 2014 has FIFTY updates.

Mike in CA

Tom, the discussion was here:

https://rennlist.com/forums/991-gt3/...ck-manual.html

There is new wording that suggests Porsche won't void the warranty unless certain more stringent maintenance requirements for track use are not followed.

Alan Smithee

Copy/pasted from the Hoosier website:

WARNING NOT FOR HIGHWAY USE
NOT FOR HIGHWAY USE: All Hoosier Racing Tires including DOT labeled Hoosier Racing Tires are designed for racing purposes only on specified racing surfaces and are not to be operated on public roadways. DOT labeled Hoosier Racing Tires meet Department Of Transportation requirements for marking and performance only and are NOT INTENDED FOR HIGHWAY USE. It is unsafe to operate any Hoosier Racing Tire including DOT tires on public roads. The prohibited use of Hoosier Racing Tires on public roadways may result in loss of traction, unexpected loss of vehicle control, or sudden loss of tire pressure, resulting in a vehicle crash and SERIOUS PERSONAL INJURY OR DEATH.

Alan Smithee

...and from the Goodyear website:

Eagle D.O.T. Radial - Sports
Eagle RS
•D.O.T. approved
•Intended for racetrack use only
•Tread compound designed for racetrack conditions
•Premium sidewall styling

Alan Smithee

Different language from the Pirelli website regarding the Trofeo R:

Specific for racetrack driving, it is approved for road use, enabling travel to the track. In the event of very wet asphalt, with the risk of aquaplaning, prudent driving at reduced speed is recommended.

fc-racer

The decision on what's really covered under warranty and what isn't will come down to your relationship with the dealer and your dealer's relationship with PCNA/PAG, etc. The manual wording will only come into play if you go to court or when your local dealer doesn't play ball. In both of the latter cases, it's pretty tough for the little guy to win.

kosmo

thats been my experience