997 GT2 Tyres

[Alex L]

So, my boss is a computer luddite and therefore I'm starting this thread on his behalf. He's trying to track down replacement tyres (P Zero) in place of the Michelin Cups but not having much luck.

Can anyone suggest where to get hold of P Zero in 325/30/19 and 235/35/19?

Thanks

[Another Fluffer]

Fronts:
http://www.camskill.co.uk/m55b0s24p0/Car_Tyres_-_M...

Rears:
Not sure you can get P-Zero's in 325/30/19...

[Dblue]

Lots of discussion on this isue here.
http://www.pistonheads.com/gassing/topic.asp?h=0&a...

Bottom line is there is almost no alternative N Rated 325 section rears available, but 305s fit with no problems and are available in several makes.
Michelin Supersport can be found but are not N Rated

[TB993tt]

Dblue said:

but 305s fit with no problems and are available in several makes.

You're probably best not bothering dishing out "advice" if you believe this

[NJA]

TB993tt said:

You're probably best not bothering dishing out "advice" if you believe this

Could you give some more info on why putting 305's on is such a problem please
As I have the same problem as the O/P sourcing tyres, other than cups for my GT3 RS (gen 2) The rear rims are 12 J, exactly the same size as the GT3 gen 2 (non RS) that use 305's, I have spoken to two well respected independents who specialise in GT3'S and they have both suggested 305's would be fine.

[TB993tt]

NJA said:

Could you give some more info on why putting 305's on is such a problem please
As I have the same problem as the O/P sourcing tyres, other than cups for my GT3 RS (gen 2) The rear rims are 12 J, exactly the same size as the GT3 gen 2 (non RS) that use 305's, I have spoken to two well respected independents who specialise in GT3'S and they have both suggested 305's would be fine.

GT3s may be "OK" with a 305 since it is only putting 460 or so NM through the tyres. The GT2 is a different beast, 700NM or more on a cold day.... this is a lot of torque and it is turbo torque so it continues for a fraction of a second as the throttle is closed (unlike the GT3 where the torque ceases immediately the throttle is shut) the big rubber is needed, DO NOT put smaller tyres on this car.

I remember Porsche telling a little anecdote about when testing Walter insisted on the next size up (from the 315 of the 996GT2) after some scary moments testing at the ring

Edited by TB993tt on Wednesday 23 January 17:01

[johnycarrera]

Don't see the issue with cups, I find them ok without any electronics.
The stability control etc on the GT2 sorts out most issues other than torrential rain or high speed into standing water, there's a new pair of rears going in the PH classifieds cheap too so you could tell him to "man up" then save him some money

[Alex L]

thanks gents, I'll relay the information and direct him to this thread.

[mrdemon]

TB993tt said:

GT3s may be "OK" with a 305 since it is only putting 460 or so NM through the tyres. The GT2 is a different beast, 700NM or more on a cold day.... this is a lot of torque and it is turbo torque so it continues for a fraction of a second as the throttle is closed (unlike the GT3 where the torque ceases immediately the throttle is shut) the big rubber is needed, DO NOT put smaller tyres on this car.

I remember Porsche telling a little anecdote about when testing Walter insisted on the next size up (from the 315 of the 996GT2) after some scary moments testing at the ring

Edited by TB993tt on Wednesday 23 January 17:01

but you could say super sports in 305 have more grip than a Pzero in 325 :-) then what do you say about that ?

[Alex L]

johnycarrera said:

Don't see the issue with cups, I find them ok without any electronics.
The stability control etc on the GT2 sorts out most issues other than torrential rain or high speed into standing water, there's a new pair of rears going in the PH classifieds cheap too so you could tell him to "man up" then save him some money

Thanks, he uses it as a daily driver and Cups only last circa 5,000 miles without any track use, hence he's looking to move to rubber with a greater tread depth.

Can't seem them in the classifieds, either I'm not looking in the right place or they've sold?

Edited by Alex L on Wednesday 23 January 17:35

[TB993tt]

mrdemon said:

but you could say super sports in 305 have more grip than a Pzero in 325 :-) then what do you say about that ?

get the Supersports in the 325 of course

I'm not sure that the P Zero Corsas are available to buy in the 325 size, availability was always rocking horse st

[993AL]

Alex L said:

johnycarrera said:

Don't see the issue with cups, I find them ok without any electronics.
The stability control etc on the GT2 sorts out most issues other than torrential rain or high speed into standing water, there's a new pair of rears going in the PH classifieds cheap too so you could tell him to "man up" then save him some money

Thanks, he uses it as a daily driver and Cups only last circa 5,000 miles without any track use, hence he's looking to move to rubber with a greater tread depth.

Can't seem them in the classifieds, either I'm not looking in the right place or they've sold?

Edited by Alex L on Wednesday 23 January 17:35

http://classifieds.pistonheads.com/classifieds/par...

[F3RNANDO]

993AL said:

Alex L said:

johnycarrera said:

Don't see the issue with cups, I find them ok without any electronics.
The stability control etc on the GT2 sorts out most issues other than torrential rain or high speed into standing water, there's a new pair of rears going in the PH classifieds cheap too so you could tell him to "man up" then save him some money

Thanks, he uses it as a daily driver and Cups only last circa 5,000 miles without any track use, hence he's looking to move to rubber with a greater tread depth.

Can't seem them in the classifieds, either I'm not looking in the right place or they've sold?

Edited by Alex L on Wednesday 23 January 17:35

http://classifieds.pistonheads.com/classifieds/par...

And from a very nice upper middle class home too!!

[996GT2]

TB993tt said:

it is turbo torque so it continues for a fraction of a second as the throttle is closed (unlike the GT3 where the torque ceases immediately the throttle is shut)

Could this be the reason that my gear shifts under full throttle are so bad, throttle almost seems to stick sometimes? Would be nice to be able to blame the car for that.

[TB993tt]

996GT2 said:

Could this be the reason that my gear shifts under full throttle are so bad, throttle almost seems to stick sometimes? Would be nice to be able to blame the car for that.

Have a look at the vid below, the way the revs rise as the gear is changed (it has a higher rev limit but ignore that factor)

http://www.youtube.com/watch?v=Cocju-Ri9qY

If this is what you are experiencing then that is normal, mine does it as well, not sure what it is, the engine isn't actually overreving (not according to logs I have done) but the needle just jumps forward on the change.

What I was referring to in relation to the turbo torque on gear change is that if you let off the throttle when the wheels spin there is like an over run as the turbo is still boosting due to its inertia. The TC and PSM will save you, mostly, but as we know they don't cut in immediately as they are tuned to allow a bit of wheelspin and drift action

[Alex L]

993AL said:

http://classifieds.pistonheads.com/classifieds/par...

Thanks, now who's the luddite, although in my defence I was looking in the Porsche specific parts section.

[jbmxx]

Having just been through all the hassle of trying to find Corsas in the correct size for the rear of my GT2, I've decided that, much as I like the Corsas, they're just not reliable enough in terms of supply.

I've gone for the Supersports - rears in those also not available in the UK (according to Michelin man!)but have had 2 shipped from the US by Tire Rack (excellent customer service). My local dealer has sorted the fronts so as soon as this bl**dy snow goes I'll report back!

[jbmxx]

Having just been through all the hassle of trying to find Corsas in the correct size for the rear of my GT2, I've decided that, much as I like the Corsas, they're just not reliable enough in terms of supply.

I've gone for the Supersports - rears in those also not available in the UK (according to Michelin man!)but have had 2 shipped from the US by Tire Rack (excellent customer service). My local dealer has sorted the fronts so as soon as this bl**dy snow goes I'll report back!

[Dblue]

TB993tt said:

Dblue said:

but 305s fit with no problems and are available in several makes.

You're probably best not bothering dishing out "advice" if you believe this

You have a real knack for being a condescending g.t you know.

A couple of weeks ago you were similarly dismissive of the same solution for a GT3 RS though I note your back sliding by introducing torque characteristics of the GT2 as a justification this time.

The fact is that the wheel is identical in width and offset to the gen 1 RS wheel and will take the same tyre. If you ask those who know about GT3s they will point out that it's entirely possible and quite safe to fit a 305.

And your point about Walter Rhorl having moments on narrower section tyres should be weighed against being caught in a heavy shower with more than half worn cups. That'll generate a few "moments"

Now, a GT2 does have more torque I accept and an owner may feel the traction would be more affected than it would on the "3" but your withering dismissal of my comment was uncalled for.

Personally I would get the Supersports from a US supplier but they are NOT N rated.

[TB993tt]

Not sure about any "sliding", personally I wouldn't fit a smaller tyre to any GT or Turbo Porsche, bigger but not smaller.
The GT3RS 4.0 only gets 460NM, this is a third less than the GT2 and as I tried to explain the turbo torque is not as easily "shut off" as the nat asp torque, and also it can swell by another 40NM in cold weather.

The withering dismissal is because I think your "advice" is plain dangerous and incorrect and I hope you take a good look at it and don't repeat it - it is the sort of BS which could get people hurt