09-15-2014, 10:37 AM | #57 |
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Kinda correct. You can still do the same thing, but what you should see is the line disappearing gradually as you go towards the outside. If you're running lots of camber and too much pressure it'll still balloon in the middle.
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09-15-2014, 10:54 AM | #59 |
i'm sorry, what?
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with regards to setting pressures
in general, a very good rule of thumb is to have enough air in the tire to support the carcass so that it doesn't roll over. any more air than that will simply stiffen it up more, and as the pressure increases then absolute grip will begin to decrease as well. so one way to do it is to chalk your sidewalls and do an autocross. If your sidewalls don't get scrubbed, you can keep dropping pressures. these are my R1Rs that I've ran for 13 autocross events as you can see, the wear line hasn't been crossed, just aggressive shoulder wear of the actual compound due to the limited camber my pressures? 27-28 hot MAX, and i'll usually start the day at 26 psi. these are 235/40/17 Toyo R1R always experiment and always be willing to test conventional wisdom when it comes to TIRES, because they all behave differently on different cars and for different applications. and for god's sake dont' listen to anything ubersuber says. He's a hardcore manual man that doesn't actually drive cars, or drive them at any level worth discussing. Probably has all the wrong inputs, which is why he spins out all the time.
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09-15-2014, 11:25 AM | #60 |
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To add to what Serge (7thgear) said above, he's also running wider tires on a narrow wheel (235's on a 7" wheel) which typically makes them more prone to rolling over, so a less oversized fitment (225's on an 8", etc) could probably run a bit less too.
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09-15-2014, 03:38 PM | #61 | |
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Generally speaking the larger the air volume of the tire for a given vehicle weight the lower the recommended static tire pressure will be. Autocross requires such completely different suspension tuning considerations that your selected tire pressures would not be useful nor appropriate for the street use of the original poster. Again though, your experience is entirely consistent with the trend the tire manufacturer would recommend I.e. lower static cold pressures for larger section tires of the same wheel diameter. The objective is to keep the designed contact patch size and shape and seek and maintain the ideal tread compound temperature for best grip and best handling. For street use this means using the tire (or car) manufacturer's recommended settings and you will invariably find that increasing the tire pressure by up to 2psi (assuming recommended cold pressure of 35 psi or so) improves grip and hardens the ride. Driving on the street you will never get the tires up to optimum temperature unless you are looking to get ticketed. Also, you might be very surprised to find the effect ambient temperature has on cold tire pressures. One advantage of adding around 2 psi to measured cold tire pressure is that you will more often be riding at the actual recommended pressure when ambient temperatures are lower than in your garage. |
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09-15-2014, 03:40 PM | #62 | |
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I'm still running mine at 35 psi even though that's the spec for 215/45x17. |
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09-15-2014, 03:41 PM | #63 |
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09-15-2014, 04:57 PM | #64 | ||
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09-15-2014, 05:12 PM | #65 | |
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Quote:
Why does volume matter for tire support? You're adding pressure to support the carcass. Sidewall construction would have a greater difference on pressure need than air volume.
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09-15-2014, 05:42 PM | #66 | |
i'm sorry, what?
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autocross STOCK class is STOCK you will see everything at an autocross you would on the road only much more intense higher g-loads and the requirement to provide MAXIMUM grip right out of the hole for 60 seconds. There are no warmups. you're actually asking the tire to do far more than you would on the street. your logic is false, go away.
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09-15-2014, 05:59 PM | #67 |
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You beat me to it @7thgear lol
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09-15-2014, 06:09 PM | #68 |
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When I get them heated up they stick much better, it's just getting to that point. Imho mpss are the best daily driver performance tire. It's just they can't take the heat and I've overheated them too many times. I still love these tires. I'm just not comfortable when pushing these tires.
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09-15-2014, 10:28 PM | #69 | |
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http://www.casc.on.ca/autoslalom OK, if you say so. |
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09-15-2014, 10:32 PM | #70 | |
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Michelin's numbers? What are Michelin's numbers for this tire on the BRZ and are you saying Michelin is wrong? What is the recommended cold tire pressure for the Michelin SS in 215/45 x 17 size on the BRZ? |
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