09-09-2019, 02:39 PM | #67 |
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Yea think I’m just gonna go 225/255 just to play it safe. Mainly using the car on road with maybe 2-3 autocrosses a year at most, so we’ll see what I think about the 255 on the back maybe next time I’ll get the 235 if I think it’s too pushy.
I see what you mean about the flipping. If I was autocrossing more that would definitely be a reason to go with the RE71 |
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09-16-2019, 10:15 PM | #68 |
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Track day at Autobahn CC north
Track day at Autobahn CC north.
Tire temp went up to 190F in front (according to TPMS). It still held up pretty nicely without being too greasy. More and more I drive on track, it feels like I may need 18 inch rim. Tire seems too soft during turn. Maybe too high sidewall from 17 inch 45 series? Last edited by TajoMan; 09-16-2019 at 10:23 PM.. |
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09-17-2019, 07:43 AM | #69 |
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Re-71r have a very soft sidewall. Might be better off with a 40 series if you want a bit more responsiveness out of the tire. What tire pressures were you at? Upping the pressure can help a bit.
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09-17-2019, 10:09 AM | #70 | |
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It's was higher than I run in Auto X. (37/32 hot) I thought the RE71r was one of the stiffest tire among 200tw tires. What other tire has stiffer sidewall? (200tw) |
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09-17-2019, 10:21 AM | #71 | |
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Regarding your tire temperatures, I haven't seen any published data on recommended tire temps for the RE-71R, but I'd guess that 190 degrees is pretty high. FWIW, I've understood the RE-71R to be more of an autocross tire than a track tire. I've never used them, though. To run a car with this much weight and power on the track, you'll get a dramatic boost in grip by increasing both your wheel and your tire widths. And by adding some negative camber. And an LSD. And... Seriously, 8½-9" wheels and 245/40s would create a significantly different experience. If cost is an issue, though, I'd start with camber. Just my 2¢. As I say, I haven't run the tire, but if I had them and didn't know where to start, I'd aim for 35-39 hot. Perhaps other drivers with track experience on the RE-71R can weigh-in here.
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Dylan861330.00 |
09-17-2019, 10:35 AM | #72 | |
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40psi is decently high. I wouldn't go any higher than that. Move to a 40 series tire if you want a sharper response from the tire. |
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09-17-2019, 03:12 PM | #73 | ||
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140 Auto x runs, 3-20 min track sessions. I had to flip it though. I will be doing 2 more auto x this year and it will be DUN. Primary focus for me is staying in FS for Auto x. So no wider rim or camber. Quote:
Maybe going for 235/45/17 was a mistake. 225/45/17 could be better with only 0.1" less thread width. Next year, I'm thinking about going 245/40/17 on current 7.5" rim. Apparently, lots of GTI guys run 245 on their 7.5" rim for auto x. At least I will have shorter sidewall with this setup. (25.4" vs 24.7" in diameter, so 0.35" shorter sidewall. ) Will see how it works. |
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10-15-2019, 09:53 PM | #74 |
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Cone Halloween
Tires nearing end of it's life.
1 more Auto X left this year. I really need to work on driving smoothly. It looks like the tires are squished quite a bit. Could be better with 18 inch I guess. Last edited by TajoMan; 10-16-2019 at 08:16 AM.. |
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11-18-2019, 09:34 PM | #75 |
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last auto x of the year
It was last Auto X of the year.
Due to the weather around here, I had to put on winter tire on 17" rims. So this Auto X was with stock PSS. (RE71r was pretty much done anyway) The stock PSS was just so slippery (compared to RE71r) First couple of runs, car was all over the place. Weather was fairly cold as well. (40~45F) Still, I never felt this much sliding with re71r. lol Weirdly, I kinda think the car felt more balanced (or natural) without too much body roll with PSS. When I used RE71r, car seems to have excessive body roll on the corner. Maybe the RE71r is too much tire for the chassis? Now I have 5 month to think about what tire/size that I want for next year. |
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06-21-2020, 11:14 AM | #76 |
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First Track Sprint this year.
I ended up with 225/45/17 Hankook RS4. It has stiffer sidewall than RE71r for sure. Surprisingly quieter as well. Ultimate grip level seems little less than RE71 but I feel like this tire is batter suited for the stock suspension. (Maybe RE71 was little too much?) Haven't tried it for auto x yet. Will see how the shoulder wears. |
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06-24-2020, 08:08 PM | #77 | |
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Yes, the RS4 has very stiff sidewalls. Totally unlike the PSS. Virutally no roll-over scrubbing. Even running at 32-34 PSI hot (starting about 25 PSI cold), I've just barely gotten to the the little triangle edge markers. And when I did, I reversed them to start wearing on the other side. You'll probably find that the RE71 was better at auto-x. It sticks better when cold. But if you're just doing it for fun, the RS4 is plenty capable. Do watch your pressures though. If you get over 36-38 PSI hot, the RS4 will start sliding like crazy. |
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06-24-2020, 08:33 PM | #78 | |
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Compared to those 2 tires, PSS is like marshmallow. So soft and quiet. Thanks for the tip. I will watch the pressure. |
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06-24-2020, 10:02 PM | #79 | |
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I mention it because many drivers think the triangle indicates how far they should be or could be exercising a tire's tread.
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2017 M240i: 23.8K, 28.9 mpg, MT, Sunroof Delete, 3,432#, EB, Leather, Driving Assistance Package, Heated Front Seats | Sold: E12 530i, E24 M635CSi, E39 520i, E30 325is, E36 M3 (2)
TC Kline Coilovers; H&R Front Bar; Wavetrac; Al Subframe Bushings; 18X9/9½ ARC-8s; 255/35-18 PS4S (4); Dinan Elite V2 & CAI; MPerf Orange BBK; Schroth Quick Fit Pro; GTechniq Crystal Serum Ultra Ceramic; Suntek PPF Last edited by dradernh; 06-24-2020 at 10:08 PM.. |
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06-25-2020, 05:37 PM | #81 | |
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Mine on RE71r were gone after 1 auto x school with 26 runs on concrete. Also auto x ed with MPSS couple of times and letters on the side wall were worn. While that triangle is not a proper "using all the tread" indicator, it certainly shows how badly the tires roll. lol |
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06-26-2020, 09:37 AM | #82 |
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I'm shocked you were able to get so much life out of your tires! I only got about 75 runs out of my first set of 245/40/17 RE71R, and that was with flipping the tires and no track/open lapping sessions. And they were pretty much down to the cords at that point. Maybe it comes down to a difference in track surfaces to some degree.
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06-26-2020, 04:34 PM | #83 | |
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At least half of those were on very grippy (rough) concrete surface. You do need to spray water. Overheating will kill re71r badly. |
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06-27-2020, 07:51 PM | #84 | |
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I do love the little smiling Michelin Bibendum triangles. Always enjoy when a manufacturer has a little fun with something like that. |
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07-14-2020, 12:18 PM | #85 |
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I'm not sure about your RE71s, but I nearly entirely wore out a set on a track weekend at a rough track here in NC called NCCAR. It's known for having harsh pavement and lots of technical curves.
Apparently that's common for RE71s to heat up and wear down quicker on track. From what I was told, they are perfect for autocross when you don't have time to heat them up, but for track days everyone suggested the RS4s instead as they last longer with close-enough traction. So now I have two sets, one for track and one for autocross. Full disclosure, this is on my NC1 Miata though. The BMW has just seen two autocross sessions with the stock tires. |
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07-14-2020, 02:16 PM | #86 |
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RE71r wears out even quicker when overheated.
You really need to watch out the heat. I had to spray water during the auto x even in 50~60F ambient. I can imagine that it will just melt out during track day sessions, especially in warm-hot days. |
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07-27-2020, 03:40 PM | #87 |
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Another Track Sprint last weekend. I was pretty much faster through every turn (except the last turn) compared to the last time but the overall time was 0.6 sec slower. Weather was so hot and it showed on straight line speed. I was 4 mph faster through the "kink" but the top speed was the same as the last time at 104 mph. Checked the intake manifold temp later and it was around 130 F. lol. no wonder why it was slower. I guess running the AC until right before the start was not the good idea. haha |
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07-27-2020, 06:03 PM | #88 |
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Are you still starting with the same cold pressures? I was running mine at 27psi cold to net 32psi hot and they were perfect coming off the track after 15 minutes in the blistering summer heat.
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