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04-22-2022, 01:08 PM | #45 | |
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. https://drive.google.com/file/d/1Dka...NToKcVkdc/view . An article which gives an introduction to the file = "The Tyre - Grip" is given here: https://www.yourdatadriven.com/tyre-...in-tire-guide/ .
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04-22-2022, 01:44 PM | #46 | |
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although i have to run 19s temporarily as a company thing. we have 3p 18in version but i can use it as we no longer produce it. but out side of that. ill be running 275/35/19 305/30/19 RT660s or V730s depending.
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04-22-2022, 01:49 PM | #47 | ||
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04-22-2022, 01:56 PM | #48 |
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uhhh really depends. 19x9.5+22 or if i reallllllly wanted to which i can 19x11 ET43 (same as rear, will be using spacers)
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04-22-2022, 02:27 PM | #49 |
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Yeah.. I'd say at least 10-12mm to make a 305 work on the rear with an ET43 offset on an 11 inch wide rear wheel.
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04-22-2022, 04:14 PM | #51 | |
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I meant to ask what 19" tire size you are using in the front. Not what wheel size. |
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04-22-2022, 04:40 PM | #52 | |
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275/35/19 or 265/35/19
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04-22-2022, 04:40 PM | #53 | |
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Journal: Link E9x ZCP Suspension Info: Link Track Chat Discord: https://discord.gg/VsKbTyqBVj |
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04-22-2022, 04:57 PM | #54 | |
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I do drive them a little differently. It's much more of a wild ride with the NT01s. Lots of sliding and more steering wheel corrections. I'm more tidy with the RRs. Now…not sure if I'll be even faster if I get more aggressive. The biggest improvement with the RRs is braking. And that's where most of my gains are over my time using NT01s. I ran a mixed set of used RRs and NT01s awhile back. It felt normal. I'd do it again in a pinch. So I think calling an RR an NT01 without the tread is not a stretch at all.
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04-22-2022, 04:59 PM | #55 |
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We have the track talk thread…and now the tire MEGAthread! What's next?
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04-22-2022, 05:16 PM | #56 | |
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Speed Hole Thread. roastbeef
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04-22-2022, 08:10 PM | #58 |
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04-22-2022, 11:53 PM | #59 |
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I think the wear on the SC3 will beat the RT660, but I suspect the latter will be faster tire.
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04-24-2022, 03:50 AM | #60 | |
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GY SC3R are pretty much the fastest 19" tires I can run other than Pirelli PZero slicks in GT3RS sizes of 265/35/19 325/30/19. Pilot Sport Cup2R are fastest but my god, that thing only lasts for ONE SESSION at that high speed. Then it just falls off a cliff. It's not a tire for practice use, that's for damn sure!
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04-24-2022, 06:36 AM | #61 | ||
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As mentioned earlier he conducted his test at Michelin's test center using a car on loan from Porsche.. and the Michelin won. The host tire manufacturer's product winning the test seems to happen a lot whenever Johnathan tests at a tire manufacturer's facilities. From Johnathan's test: "The Goodyear Eagle F1 SuperSport RS, Michelin Pilot Sport Cup 2 R and Pirelli P Zero Trofeo R are regarded as three of the fastest road-legal track day tyres in the world. To find out which of these three semi slick tires reign supreme, I've borrowed a 991.2 Porsche 911 GT3 RS, and have use of Michelin's tyre test facility in central France to run my own tyre testing program." . . Pilot Sport Cup 2R vs. GY SC3R vs. Trofeo R
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04-24-2022, 09:50 AM | #62 |
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When running tire tests and calling one tire faster than another because the delta is .1 or .2 differences is ignoring too many variables that happen on one lap.
Also, running a test for 4 laps does not capture the full $1600 experience of a tire life. My point is that there is no substitute for your own goals of what you want from a tire. Having said that, I look at a lot of tire reviews to learn what the evaluation criteria are? when I drive, what should I look for in addition to lap time? |
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04-24-2022, 10:27 AM | #63 | |
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I'll give one. Hoosiers. People say they are good up to 4 seconds a lap vs a lower end R-comp like an NT01. I think that comes down to driving style, track temp, air temp, rubber on track, sun/cloud cover, tire condition, fuel load, driver condition, etc, etc. When I instruct I always stress to my students that the track evolves from lap to lap. You can get a similar comparison but never an absolute apples to apples comparison. I look at data in braking zones. IMO, that is the ultimate indicator of grip. If I visually compare videos, comparing my own data, and being out on track the biggest difference among tires is threshold braking distance. If I compare my own corner speeds to a GT3 cup car at COTA, I'm at 42mph in T1 and so is the GT3 cup car. The cup car is running a 2:13 lap and I'm running a 2:30 lap. At the track out point, I'm about 2-3mph slower - mostly due to a power deficit. Oddly…I'm actually at higher speeds in some parts on the track…only slightly! The difference in lap time is I'm braking at about 125m from 123mph and he is braking 100m from 148mph. Suspension and aero play a role too but your limitation on braking grip is mostly tires. So if we just eliminate the brake zones then maybe bigjae1976 > Porsche GT3 cup car🤣
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04-24-2022, 11:39 AM | #64 |
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Excellent point bigjae1976
This is why I wanted to have the ability to analyze when the ABS kicks in using AIM. On the PT6 protocol the 10hz limitation was not fast enough. AIM increased the sampling rate max to 25 and 50hz. If you are using AIM and the PT6 CAN bus, I recommend updating your config profile to the latest PT6 (2.00.06) and increase the sampling rate to 25Hz. using the deriv(brake press specific wheel) watch the brake pressure fluctuate while the BRAKE PRESS is INCREASING. BRAKE PRESS is what you do BRSKE PRESS individual wheel is what the car is doing. Tire related content Compare your data among different tires. A stickier tire will kick the ABS at a higher brake pressure. For example, on UHP All season my ABS was kicking in at 800psi and on used track tires from last year it was kicking in at 1200psi Also, observe the point in which there is no point pressing the brake pedal harder. There was no point going above 800psi on the all season, meaning find other aways to gain speed. Not only you can see the difference among tires. This also allows you to monitor one aspect of tire deterioration toward the end of tire lives (not counting the edge deterioration) |
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04-24-2022, 11:49 AM | #65 |
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>> So if we just eliminate the brake zones then maybe bigjae1976 >=Porsche GT3 cup car🤣
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04-24-2022, 01:40 PM | #66 | ||
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Someday, I want to upgrade to an AiM dash in my E46 and install pressure sensors on the brake lines. Morehead Speedworks makes a handy brake line with a bung for a pressure sensor. I am curious to see what the options are for an E9X.
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