958 Wheels/Tires/TPMS
#31
Banned
#32
Burning Brakes
https://www.suncoastparts.com/product/SKU971G219WW.html
I was able to find a set of these; to follow up on North Shores question - any real or perceived problem with running these on our Cayenne? Understanding that the staggered setup is theoretically not the best (I had it on my 955 Turbo), and the curb weight of the Panamera S is greater than my base, is there any issues to mounting these or similar Panamera staggered wheel sets?
TIA!
I was able to find a set of these; to follow up on North Shores question - any real or perceived problem with running these on our Cayenne? Understanding that the staggered setup is theoretically not the best (I had it on my 955 Turbo), and the curb weight of the Panamera S is greater than my base, is there any issues to mounting these or similar Panamera staggered wheel sets?
TIA!
#33
Banned
That makes sense - I'll swap them on and let you know what appears different - obviously having a lot more rubber on the road with a shorter sidewall would tend to change the handling dynamics in a positive way (all things equal), but you're right that with the stagger it should understeer more.
#34
Pro
Yeh it certainly seems like staggered is a bit of a lose lose situation. Have some friends with high performance audis, and they always mention i guess what would be "reverse stagger", putting wider tires on the front and narrower on the rear, to help combat understeer, but I dont think anyone has really ever done it, let alone made an educated enough comparison to prove it works.
#35
I have 3 sets of wheels and tires for my cayenne. Never thought I'd justify 3 sets for one cars but it makes total sense and I'm glad I do.
I have an all terrain setup (20" wheel 31" tire) for overlanding and driving on beaches here on long island, a snow setup (20" wheel 31" tire) for driving to upstate new york and vermont for snowboarding in the dead of winter, and I have a high performance setup (21" wheel 29" tire ) because the higher profile all terrain, and snow tires handle like crap and make me sad when I go fast haha.
I have an all terrain setup (20" wheel 31" tire) for overlanding and driving on beaches here on long island, a snow setup (20" wheel 31" tire) for driving to upstate new york and vermont for snowboarding in the dead of winter, and I have a high performance setup (21" wheel 29" tire ) because the higher profile all terrain, and snow tires handle like crap and make me sad when I go fast haha.
#36
Pro
I have a friend with a Q7 and tire fitment seems to be almost identical. he was originally running the same tire setup as me for all terrains, but recently downsized to 18" to gain a bit of sidewall. His tires end up at the same rolling diameter as mine, but for some reason are labeled on the sidewall as 31" but mine are labeled as 30". Not sure what the reasoning is behind that, but whatever route you go, I wouldnt go larger than 30.5". Even if you don't have air suspension and the car sits a bit higher on the springs, I still think you'd run into clearance issue on the inner fender liner.
#37
Banned
Yeh it certainly seems like staggered is a bit of a lose lose situation. Have some friends with high performance audis, and they always mention i guess what would be "reverse stagger", putting wider tires on the front and narrower on the rear, to help combat understeer, but I dont think anyone has really ever done it, let alone made an educated enough comparison to prove it works.
*Based on OEM's typically designing for understeer vs. oversteer.
#38
Pro
I think physics would suggest that putting wider tires on front would combat understeer, but putting narrower in the rear would likely cause oversteer which is worse than understeer.* That said, I agree that the porridge being just right is most likely a square setup.
*Based on OEM's typically designing for understeer vs. oversteer.
*Based on OEM's typically designing for understeer vs. oversteer.
#39
Banned
For the record, I have a base so not sure I can go fast enough for any of this to matter!
#40
Pro
Makes sense. For the purposes of this thread though I think the debate is do you make up for added understeer with a staggered setup by having more rubber across all four tires (or just two in the back depending on your original setup) and a shorter sidewall?
For the record, I have a base so not sure I can go fast enough for any of this to matter!
For the record, I have a base so not sure I can go fast enough for any of this to matter!
#41
Rennlist Member
It'd depend a lot on the tire and suspension setup. I've thrown my '17 GTS around savagely hard in autocross and didn't find it to push excessively, certainly nowhere near what you'd expect out of anything else of this size/weight. And this was on year-old 20" Eagle LS2 rubber with the air suspension option (but no PDCC). I do share your opinion that staggered would likely make it worse.
#42
Banned
Swapped the wheels yesterday and very happy with the outcome. Handling is noticeably sharper, looks much better from every angle (especially the back).
Also I think all the concerns about staggered setups on AWD is overblown. Just walked by a brand new Cayenne with 305s on the rear and 285s on the front, as they came from the factory.
Actually looks almost identical to the setup I have.
These are OEM spec’d staggered setup on the 9Y0.
Also I think all the concerns about staggered setups on AWD is overblown. Just walked by a brand new Cayenne with 305s on the rear and 285s on the front, as they came from the factory.
Actually looks almost identical to the setup I have.
These are OEM spec’d staggered setup on the 9Y0.
#43
Rennlist Member
It's your wallet's funeral, go forth and wreck your drivetrain. Just don't pretend that's the same thing as a properly engineered setup.
#44
Banned
If you have a general issue with Porsche engineering, great, but this ain't your thread.
On a thread-related note: Seems that the same wheel/tire on a heavier vehicle calls for a higher PSI; since I'm running a base cayenne, I figure I should conform to the PSI appropriately scaled to the GVW - i.e. lower pressure?
#45
Rennlist Member
Not sure I follow...prior generation Cayennes ran staggered setups from the factory. Following generation Cayenne' run staggered setups from the factory. Pretty much every other AWD Porsche offers staggered setups from the factory. But for some reason Cayennes made from 2011-2018 will spontaneously combust because the rear tires are 1.2" wider than than the fronts and rolling diameters are statistically identical?
If you have a general issue with Porsche engineering, great, but this ain't your thread.
If you have a general issue with Porsche engineering, great, but this ain't your thread.
But, like I mentioned, feel free to set yourself up for the drivetrain repair expenses. I'm out.