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KEEP M3POST ALIVE BY DOING YOUR TIRERACK SHOPPING FROM THIS BANNER LINK! |
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11-16-2011, 07:54 PM | #23 | |
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Oversteer to my understanding is a traction bias to the front, meaning that the front tires have more grip than the rear at the moment of oversteer. If you increase the rear pressure wouldn't this reduce the rear traction and magnify the oversteer tendencies?
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11-16-2011, 08:33 PM | #24 | ||
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I think he meant to say Correct UNDERSTEER. Otherwise I'm confused also! |
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11-16-2011, 09:08 PM | #25 |
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11-16-2011, 09:28 PM | #26 | |
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On Roger Kraus Racing's website I found a table (standard table) describing how to adjust a setup to deal with oversteer and understeer - just click on "Understeer-Oversteer" to see the table: http://rogerkrausracing.com/CompatSite/information.html Please look in the oversteer column and tell me how you would adjust rear tire pressure to deal with oversteer? Last edited by M3SQRD; 11-16-2011 at 09:42 PM.. |
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11-16-2011, 09:38 PM | #27 | |
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It Says on page 17 "To Decrease Oversteer higher the Front Tire Pressure or Lower the Rear Tire Pressure" |
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11-16-2011, 09:48 PM | #28 | |
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11-16-2011, 09:56 PM | #29 |
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I must say I don't have much experience with this so I wouldn't bet too much that I'm correct either. haha! But that is kinda how I interpreted the article and it does make sense to me also.
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11-16-2011, 10:10 PM | #30 | |
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I'm done discussing the subject and sorry for confusing everyone |
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11-16-2011, 10:41 PM | #31 | |
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Yeah they article you posted http://www.turnfast.com/tech_handlin...ling_pressure3 also suggested the same as the Michelin article to lower front PSI to reduce understeer: "If the tires felt very slippery, especially if they got worse on every lap, then the tire pressure is too high. Take each tire pressure and write it down. If only the front or rear tires felt slippery (the front was slippery if the car understeered and wouldn't respond to more steering input, the back was slippery if the car wanted to oversteer and spin), then lower the pressure of just that pair by 4 psig while they're still hot. Try this setting for the next session." |
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11-17-2011, 03:26 AM | #32 |
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11-17-2011, 03:43 AM | #33 | |
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real PITA is 40psi hot too much on a hot day? I always thought running about 38 hot would be ideal? I haven't tracked on the RS3s yet...but I've heard they're sensitive to temps on the track more so than other street tires
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11-17-2011, 04:31 AM | #34 | |
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Here's an example for you...if you set your the pressure of a tire at 20 psi and then 50 psi, assuming the tire doesn't get greasy (extreme example), which tire pressure setting will have more grip - the one at 20 or 50 psi? |
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11-17-2011, 04:44 AM | #35 | |
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38 or 40 psi - it all depends on the tire, as well as the track surface. Try both, or even a third setting, on a given day and see which one works better. No two track days will be identical - that's why you'll hear a lot of race teams say they aren't able to use a setup from a previous year, or even a recent test, at the same track. Experiment with different setting - that's part of the fun! Everything I've stated is based on experience. Just to really confuse things...why is it that you have to run a stiff front sway bar, relative to the rear, on an e46 M3 to reduce understeer (not a typo)? |
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11-17-2011, 06:06 AM | #36 |
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Here's the last link I'm going to provide on the topic of adjusting tire pressures for driving on race tracks, not autox circuits:
http://www.summitpoint-raceway.com/i...atid=38&id=174 My own personal experience with e30 M3s, e36 M3s, e46 M3s and e92 M3s follow the tire pressure tips, as well as all other suspension tuning tips, in the links I've provided. Clearly I'm in the minority on how tire pressures should be adjusted to FINE TUNE handling characteristics, although it appears I'm also one of the few with a lot of practical experience, so please ignore all of my comments and go figure things out on your own. |
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11-17-2011, 09:03 AM | #37 | |
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11-17-2011, 12:05 PM | #38 | |
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I'm grateful for all the info on here A friend of mine cored his almost new PSS after 2.5 track days and 2k miles. I don't want to be cording any tires... to prevent cording, alignment yes, but tire pressure plays a big roll too right? If the outside edge of the tires are wearing too much, that means too much pressure right?
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11-17-2011, 12:12 PM | #39 |
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I haven't read the second link (yet) but the first link really describes a good way to solidify a working tire pressure. I'm shopping for a pyro right now and will use this method to dial it in.
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