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12-07-2019, 10:38 AM | #10759 | |
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#ladydriven Heavy-spec M3 // KW Clubsports // AA x-pipe // Gintani muffler // Macht-Schnell intake // Gintani tune // OMP Seats // Too Many Apex Wheels // Stoptech ST-60 // Cobalt Friction brake pads |
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12-07-2019, 10:54 AM | #10761 | ||
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In short, 18" won't clear my Brembo brakes |
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12-07-2019, 01:00 PM | #10762 |
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Drives: '09 E90 M3 - IB
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12-07-2019, 02:50 PM | #10764 | |
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That is the cost of two track days for less than 2 second. I have to admit that the grip of front R7 265/35/19 is intoxicating. BTW, while 235 sounds narrow, I calculated width of rubber on the road of 245, 265, and 275 and everything I measured had LESS contact patch than the RR 235. And the data backs it up. |
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12-07-2019, 03:03 PM | #10765 |
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12-07-2019, 04:29 PM | #10766 | |
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12-07-2019, 08:27 PM | #10767 | |
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more grip with a 265, but somehow the 235 has a larger contact patch? contact is directly related to grip.
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12-07-2019, 10:24 PM | #10768 | |
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For example, a set of 255 slicks will be faster then a set of 295 AR1/RR's, etc. comparable R-comp tires. They may overheat easier and wear more quicker due to the the narrower contact patch - but they will be faster. |
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12-07-2019, 11:58 PM | #10769 |
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because of the variance of treadwear ratings differing between brands coupled with environmental variables, it might be impossible to even make that comparison. there is going to be an overlap somewhere with a high grip skinny tire, and a lower grip, wider tire, but its going to be almost impossible to determine where.
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12-08-2019, 02:34 AM | #10770 | |
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Initially, I also refrained from commenting. Maybe rhyary is giving us the tl;dr of his notes?
Different compounds and different tyres are going to require different alignments. I have no idea which "265" is being compared here: Quote:
AD08Rs have steel inserts and should cope decently with camber. I ran them at -2.8 on soft OEM suspension (1M being softer I suppose?) and same set once at -3.4 with coilovers (570lbs/in). If you corded (or wore/tore?) the A7/R7, needs more camber! A probe pyro would tell you this immediately. |
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12-08-2019, 03:44 AM | #10771 |
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Regardless of his contact patch calculations and comparisons of wide x brand tires to the 235 RR, he said he was running 295 rear RR and 235 front RR. I can't imagine that M3, with its relatively typical overall track setup, not handling like crap and understeering horribly.
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12-08-2019, 06:26 AM | #10772 |
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I am. Front and Rear. MSI
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12-08-2019, 06:30 AM | #10773 | ||
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12-08-2019, 06:32 AM | #10774 | |
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But, non of it is scientific so take it as observation. For example, with the RR 235, I was easily doing multiple 1:37 on multiple sessions through out the day throughout the season. On the ADOR8, while my fastest time is 1:37.2, most of the laps were 1:38-39 and only few sessions in the fall when it was cooler. |
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12-08-2019, 06:33 AM | #10775 | ||
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12-08-2019, 06:34 AM | #10776 | ||
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12-08-2019, 07:09 AM | #10777 | |
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The only combination that got me into 1:37 besides RR and R7 is the ADO8R when I was on 265/30/19 front. At that time, I was afraid that 265/35/19 won't fit. But @slicer posts and others convinced me to try the R7 size ls to 265/35/19. It worked ver well. I liked the ADOR8 the most on the track out of the non slicks. I love the PS4S 275/30/19 on the road and in the wet on the track. So a viable non-slick option is the ADO8R in 265/35/19 295/30/19. The the price is almost like the R7, so for the price, I rather get the R7. But I am very curious to give that combination a try. The RR is not ideal, but factoring the RR price of less than $1000 for a set, and $237 front is very compelling option. And fast. The RR rears last many track days (so was the R7) So I rather experiment with the RR since it is the lowest price for almost fastest time. Last comment about the PS4S. While wonderful tire in the wet and damp surface, in the dry at a 1:38 pace I am peeling the rubber of the tire. So not just wear, but the rubber is too soft. The ADO8R where impressive at 1:38/37 pace but again I was on -2.5 when I tried them and corded the outside. In general, I think it is good to be skeptical of anyones findings. At the same time, I have close to 70 track days on the same track, and I am running one of the fastest times on that track given HP and weight. So perhaps it means something. Or not. Who knows. |
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12-08-2019, 09:03 AM | #10778 |
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I have no idea why you guys monkey around with different tires and compounds. That is a complete waste of time and money .......especially if your trying to save money or go fast. Plus a good suspension is set up for a particular tire. You can't just throw on a new tire and expect it to perform without optimizing the setup.
This could go for any number of modifications. It's pretty well documented what works on this platform. You don't need to develop it yourself. |
12-08-2019, 09:19 AM | #10779 | |
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There is a point in sharing information so that we can learn from each other based on the collective experiences we all have. It gets more specific than that. This is a subform of track experiences. The going around the track is so complicated, with so many variables, there will never be a one answer that fits all. In this case take camber as an example. My point was that we can't just agree on "best camber" because -3.5 with R7 265/35/19 would be faster than -2.5 RR 235/35/19 but at the delta cost of +$600 a set. We can argue, and we should, on the minute details, but these are the choices we need to make. And having choices and making decisions is part of the fun. Isn't it? |
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12-08-2019, 02:04 PM | #10780 | ||
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I will agree with Rhyary though, the experimentation is certainty part of the fun! |
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