12-05-2019, 10:11 AM
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#5 (permalink)
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A True Z Fanatic
Join Date: Feb 2013
Location: Austin, Texas
Posts: 1,390
Drives: 11 370Z, 2x Kawasaki
Rep Power: 64765
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Quote:
Originally Posted by physics
I recently got a set(245/40R19-F, 275/35R19-R) on my 370Z sport coupe as replacements for the OEM Bridgestone Potenza S007 tires. The recommended inflation pressure is 32 psi square. I DD my car and don't track it, although I occasionally do some spirited canyon carving and slicing and dicing on the coastal mountain roads here in northern Cal when the weather permits. I was wondering if you had experimented with tire pressures and had found something good? When I set the pressures to 32 psi on the Michelins the car felt like it was a bowl of Jello around corners. I bumped up the cold pressure to 36 psi square and the car is handling much better. I did put some very stiff Hotchkis sway bars on the car a few months ago, which greatly improved the handling.
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That sounds 100% correct. The Bridgestones are known to have super stiff sidewalls, especially when you go up the performance ladder. So you really don't need much air in them to get stable handling. When I ran RE-11s and RE-71Rs for daily driving, I would have them set at 32 psi, mainly because I found they wear evenly at that pressure. The door pressures were causing more wear in the middle of the tread. I did run different wheels compared to stock, so that likely also affected it. Now I don't daily the car and it usually sits on the Conti Extreme Contact Sports with around 34 PSI.
Regarding the performance metrics listed earlier in the thread are for extreme driving conditions. So during track conditions, I wouldn't doubt the Michelin's worth. If anyone is DDing, they shouldn't be getting near those limits on the street anyway as that's ridiculously irresponsible. So getting a comparable tire for significantly less money would make sense. tl;dr, I would get Michelins if I was sensible about doing Daily driving and track work with one set of wheels.
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