where are the Porsche cayenne expo builds?

casioqv

Dr. Diesel
Don't expect I'll do much (I'd have otherwise gone with a Cayenne S and Off-Road Package).

I'll do A/T tires if a Porsche rated one is ever made available.


Nothing beyond gravel and logging roads, maybe two-tracks.

It'll be a touring car that'll get me to the trailhead and allow me to explore a bit.

So don't need or want a lift, just a little protection (if only for peace of mind). Probably some lights too.

It sounds to me like the whole idea of 'Porsche rated' tires is to guarantee that the car will handle like it's designed to during performance driving at the limit on dry pavement... that is completely at odds with the idea of ATs, where you absolutely will compromise dry pavement performance handling substantially.

Personally, even on Porsche sports cars I wouldn't care about the whole Porsche rated thing. I'm sure the modern non-Porsche rated Contis on my Boxster grip and handle much better than whatever tires Porsche spec'd when it was new, because tire technology has come a long ways since then.

For my Touareg I just keep two sets of tires and wheels, one for street and one for offroad, and swap depending on use.
 
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clarence2

Member
It sounds to me like the whole idea of 'Porsche rated' tires is to guarantee that the car will handle like it's designed to during performance driving at the limit on dry pavement... that is completely at odds with the idea of ATs, where you absolutely will compromise dry pavement performance handling substantially.

Thus my reluctance.

Again, I choose the GTS over an S/Off-Road Package because I favor on-road performance.

I just assume a Porsche-rated A/T tire would compromise the least.
 

casioqv

Dr. Diesel
I just assume a Porsche-rated A/T tire would compromise the least.

It's just not possible, no 'rating' can get over the fact that there are limits to tire engineering, and the two demands are at extreme odds. Dry pavement grip requires a soft compound, while an A/T must be extremely hard to not get torn up by rocks.

Edit: I did have a thought though, that there are Porsche approved A/Ts on the 911 Dakar- the Pirelli Scorpion A/T plus. So, could could certainly put a set of those on your GTS, although they probably didn't approve a GTS compatible size. But you'll run into the fact that the GTS has such huge brakes it cannot really fit a small enough wheel suitable for all terrain tires.
 
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mep1811

Gentleman Adventurer
Since this is not a Cayenne performance forum running street tires would not last very long off pavement. Many of the high performance tires last only 12-20 K miles sometimes less. I usually get 40K out of my AT tires with a rotation every five thousand miles.

Running Duratracs now and these are the best so far. A little road hum but does all I want.
 

mk216v

Der Chef der Fahrzeuge
A/T’s are more durable than street compound, but you don’t want the A/T too hard else they won’t grip at street pressure or when aired down (case in point my Michelin XZL’s or Continental MPT81’s—both military tires, yet when aired down they don’t grip terrain like a Toyo OpenCountry AT3 does).

I had 255/55/19 Duratrac’s on my 958 CTT for awhile and they were a good dual purpose tire, but boy when they wore down they howled like a SOB! Really pleased with the Toyo OC AT3’s on my TSSY.
 
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mk216v

Der Chef der Fahrzeuge
High ply tires like military tires will not air down nor will a 10 ply LT tire on a light vehicle.

They don’t air down a whole lot on a 9ton rig either!
Point was that you don’t want an extremely hard A/T tire; durable yes, with some pliability yes.
 

clarence2

Member
I did have a thought though, that there are Porsche approved A/Ts on the 911 Dakar- the Pirelli Scorpion A/T plus.

That's actually a really interesting thought, thanks.

So, could could certainly put a set of those on your GTS, although they probably didn't approve a GTS compatible size. But you'll run into the fact that the GTS has such huge brakes it cannot really fit a small enough wheel suitable for all terrain tires.

Probably, but worth looking into.
 

casioqv

Dr. Diesel
High ply tires like military tires will not air down nor will a 10 ply LT tire on a light vehicle.

The Cayenne isn't even close to light though- they're heavier than a lot of full sized 1/2 ton pickups. My 10 ply (load range E) KO2s air down just fine on the Touareg, I usually use 18psi on sand and 26psi or so on rock.
 

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