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10-27-2020, 02:52 PM | #15 | |
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It’s only 10mm so I think you will be fine with either. I do remember that early on people who went 225 said the car lost some playfulness which means the rear had more grip. So if you want that get 225. But obviously compound of the tire would matter a great deal. |
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10-27-2020, 02:58 PM | #16 | |
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10-27-2020, 06:50 PM | #17 | |
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Getting an alignment and moving from the stock all-seasons to UHP 225s was the best choice I made for a mostly street driven car, except on those days when my inner 12 year old wishes I could still get a powerslide going under the speed limit. |
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10-28-2020, 07:35 AM | #18 |
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New tires at full tread depth will not feel as responsive, worn tires usually feel much better. Particularly for tires that are not "Extreme Performance" category. My Conti ECS felt like crap at the track when new, now at half-worn they're a LOT better... Of course if tires are aged or heat-cycled out, they're going to lose a lot of grip but when and how that happens is very tire-specific. Some tires grip well all the way to the cords.
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10-28-2020, 08:58 AM | #19 | |
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10-28-2020, 11:30 AM | #20 | |
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I am not a fan of the RS4, their are better options especially for autoX.
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10-28-2020, 11:35 AM | #21 |
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Clark20: your alignment already should be much better then stock of 0dg (and -1dg rear) front camber. It's common on these cars to dial by some 0.5dg more front camber then in rear for wished front-rear grip balance. Then again if it's for track or autox use, car may benefit from overall camber increase, eg. -3+ front and -2.5+ rear camber (more precise optimal values using pyrometer). For street only i wouldn't bother past what you have.
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10-28-2020, 01:51 PM | #22 |
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Both 215 and 225 is a good fit for the wheel. Again like mentioned, the tire make/model/compound is going to be a way bigger factor than width especially for a newer driver. Personally, I'd go with the 225 with a tire like the RT660. The RT660 is a great 200TW tire that's not only budget friendly, but also they communicate very well to the driver and have a very progressive break-away point.
Additionally, the other thing I'd recommend you get a set of camber bolts in the front and max them out. Even with fully maxed out camber bolts, the car is still a bit under-steer'y which isn't a bad thing for a newer driver. Other than that, have fun!
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10-28-2020, 02:05 PM | #23 | |
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Sent from my SM-N960U using Tapatalk Last edited by Clark20; 10-28-2020 at 02:30 PM. |
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10-29-2020, 05:16 AM | #24 | |
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PS4S runs pretty narrow though. If I remember right, at stock size it is 6.8 inches wide. It'll feel really nice and can be playful if you want it to be, but nowhere near the grip it would have at size 245. |
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10-29-2020, 06:25 AM | #25 |
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In quick sequential lateral transitions in autocross, maybe. On track, especially with stock NA power, 225 might even outperform 245, due lesser weight and rolling resistance. After all, it's not as if grip increases proportional to width increase, as car weight is unchanged, so car will weight down less per area on wider tire, as result contact patch area not changed that much, rather changing shape to that of shorter but wider. Also slight cons of wider tires is increased aquaplaning in wet and price. And that wide tires will benefit from also wider wheels, for tires to not gain much extra sidewall flex if on narrower wheel.
At the end i guess it all depends on priorities/goals. Maximum grip in autocross for sake of competitiveness? Wider tire, if allowed by class rules, might work better. For track & DD with NA car i'd probably go for 225. |
10-29-2020, 07:31 AM | #26 | |
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Unless it's for classification or tire life considerations, I wouldn't bother with PS4S if going faster is the goal. |
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10-29-2020, 07:44 AM | #27 | |
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Wider tires don't necessarily have greater rolling resistance, in fact they should have *less* rolling resistance due to less hysteresis from shorter/wider footprint vs. longer/narrower with more deformation. Well known in bicycling. Their problem is wider tires have more aero drag, but this is less true for cars! I ran 225 and 245 RE71Rs during my 2018 track season, and relative performance vs. consistent benchmarks would indicate there's not much in it either way as far as lap times, with the 225 setup running 40 lb. lighter for same classification points. Unfortunately I have no back-to-back 225 vs. 245 data! Last edited by ZDan; 10-29-2020 at 08:41 AM. |
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10-29-2020, 12:08 PM | #28 |
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So a little more information about my car... It's full bolt on E85 and I have the pp wheels wheels which are 7.5. I know if I wanted to get max performance for better times it would be best to get a separate set of wheels with some sticky RE71 or A052 etc... in 245 but for now I only want to have one set of wheels. I've done some research and it seems that having 0.5 narrower tread width than the wheel width is good for feedback/responsive. The Ps4s in stock size have a 6.8 tread width so that is 0.7 narrower than the wheel width. Should I go with the 225 which is a 7.5 tread width or just stick with the 215 which is also the same diameter as stock. How much more grip will I really gain by moving up to 225 and is it worth it in exchange for the driver response and feedback of the 215? Im thinking also that the 225 with take more advantage of the -2 camber I have because more contact patch.
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