[QUOTE=wanderfalke;4140337]
Originally Posted by bluepr0
(Post 4139947)
These were my PZEROs with 11k miles on it. And they still had some grip.
What causes the big missing chunks? |
Originally Posted by lunarx
(Post 4140228)
Tspyder/Steve997s,
Were you running comfort-pressure @ partial load? PSS dont like high pressure. I'm running std pressure/full load (ie, 36/44) for a couple of reasons. First, that is the pressure that the factory set when I took delivery in Zuffenhausen; and second, I tend to prematurely wear the outside edge of tires on every vehicle I've owned unless they are set to the upper range of of rec pressures. Even wear, tread life, and handling are more important to me than comfort. Never heard that MPSS work better with lower pressures, and they do fine on my 650 at higher than normal pressures. Maybe I'll give lower pressures a try on the 991. Spyder |
Originally Posted by TSpyder
(Post 4140485)
My only nitpick with the MPSS is that they don't seem to have as high a cornering limit as the OEMs. I live off of one of the premier driving roads in socal so I have a fairly fine sense of handling limits. I virtually never broke the Pirellis loose like I can with the MPSS on my daily drive.
I'm running std pressure/full load (ie, 36/44) for a couple of reasons. First, that is the pressure that the factory set when I took delivery in Zuffenhausen; and second, I tend to prematurely wear the outside edge of tires on every vehicle I've owned unless they are set to the upper range of of rec pressures. Even wear, tread life, and handling are more important to me than comfort. Never heard that MPSS work better with lower pressures, and they do fine on my 650 at higher than normal pressures. Maybe I'll give lower pressures a try on the 991. Spyder |
Originally Posted by John's 991
(Post 4140573)
Try 31/34. I think you will be very pleased.
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Originally Posted by Steve997S
(Post 4140589)
Until you hit a sharp bump and bend the wheel. Truly I wouldn't ever go less than a few PSI under recommended as handling, cornering and braking may suffer. The point is to let the suspension handle road irregularities, not the tires. The right tire pressure keeps the contact patch and deflection correct for the car design. Too less and during aggressive cornering you may actually put some of the sidewall in contact with the ground. But just for a second until the tire rolls off the rim ;)
If Spyder's cold temps are 36/44 and hot temps are 3-5 psi higher, it is no surprise that he feels less grip than from the P0s. In addition, as the max pressure according to Michelin is 50 psi, he is probably more at risk for a blowout with those pressures than rolling off the rim at 31/34. If you have lots of potholes where you drive than I would try 3-4 psi higher, but if you want maximum grip from the MPSS then hot pressures should be less than 40. And at 31/34 or a few psi more you will be fine, but will want to reset the TPM to comfort. Hot temps will probably be 3-5 psi higher on the street and 8-10 psi higher on the track. I have pulled a over 1.3G lateral and 1.2G under braking routinely at these pressures with no problems including minimal outside shoulder wear (SPASM but no PDCC) With that said, only do what you are comfortable doing. |
Johns991 is right;
Use Comfort Pressure w/o Full Load for 20" Summer Tires. That gives you the low [31/34] pressure you need for PSS to work properly. This pressure is fully factory recommended. Part Load is how most people use a 911, so the Full Load setting is overkill. |
Originally Posted by John's 991
(Post 4140621)
If you take a look at your manual you will find that these are the recommended "comfort" pressures for winter tires (31/39 for summer tires on a CS2 with 20" wheels). There is no risk of the tire rolling off the rim but Porsche recommends keeping the speeds below 150mph at this pressure. In addition I know from personal experience that the MPSS do not grip well over 40psi whereas the P0s are less sensitive to higher pressures.
If Spyder's cold temps are 36/44 and hot temps are 3-5 psi higher, it is no surprise that he feels less grip than from the P0s. In addition, as the max pressure according to Michelin is 50 psi, he is probably more at risk for a blowout with those pressures than rolling off the rim at 31/34. If you have lots of potholes where you drive than I would try 3-4 psi higher, but if you want maximum grip from the MPSS then hot pressures should be less than 40. And at 31/34 or a few psi more you will be fine, but will want to reset the TPM to comfort. Hot temps will probably be 3-5 psi higher on the street and 8-10 psi higher on the track. I have pulled a over 1.3G lateral and 1.2G under braking routinely at these pressures with no problems including minimal outside shoulder wear (SPASM but no PDCC) With that said, only do what you are comfortable doing. |
Originally Posted by chuckbdc
(Post 4141048)
What? You recommend reading manuals and facts over faith? No wonder you are under such cornering pressures!
LMAO, yeah go figure. Amazing what you can learn with that interweb thing everybody is talking about. |
So what is the consensus for optimal tire pressure for maximum wear out? (as opposed to maximum tire performance)?
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Originally Posted by John's 991
(Post 4140621)
If you take a look at your manual you will find that these are the recommended "comfort" pressures for winter tires (31/39 for summer tires on a CS2 with 20" wheels). There is no risk of the tire rolling off the rim but Porsche recommends keeping the speeds below 150mph at this pressure. In addition I know from personal experience that the MPSS do not grip well over 40psi whereas the P0s are less sensitive to higher pressures.
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