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Kumho Ecsta V730 - Their best lap at Laguna so far 

TeejDrives
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HPDE with SpeedSF
987.2 Porsche Cayman S
No power/engine/intake/exhaust mods
No aero mods
KW V3
Kumho Ecsta V730 (3rd day)

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17 окт 2024

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Комментарии : 19   
@auslacroix
@auslacroix 3 месяца назад
I've been meaning to ask this for a while: I see that you give some steering input before you actually turn into the apex and I am wondering why? (Apologies in advance if it's a dumb question!)
@teejdrives
@teejdrives 3 месяца назад
Which corner(s) / timestamp(s)? If it's 8, I was unintentionally turning in too early all day.
@auslacroix
@auslacroix 3 месяца назад
@@teejdrives At T3, 0:31 is one of my favorites. It looks like you're initiating turn in and you're waiting for the car to start rotating, then you straighten out for just a moment to get the rear to dig in and send it into the apex. I've done that in the past but I don't remember the feeling that made me do it.
@teejdrives
@teejdrives 3 месяца назад
@@auslacroix There are two things you might be seeing as one comes right after the other. The first is I straighten out the wheel to brake in a mostly straight line because where I want to begin braking, the car is still slightly turning or there's more weight on one side of the car. Braking hard with the wheel still turned would shock the outside front tire as the suspension compresses, or even cause the back to come around. (It's also a way to intentionally initiate a bit of rear slip if you don't overdo it, which I try to use to enter T9.) I do that straight line braking in T2, T3, T10, and a bit in T11. The second is progressively loading the outside tire for turn in, also without overloading it too quickly. How long that takes depends on all the things (springs, bars, ride height, dampers, the corner) but even with my front compression damping nearly maxed out I still can't just slam the wheel over without shocking the outside tires, so I manually try to manage the weight transfer which might be why turn in looks slow. The straightening out mid-corner looks like a correction to the line. Probably most corrections I do are for the line and not because the car is sliding some way I don't want.
@auslacroix
@auslacroix 3 месяца назад
@@teejdrives Epic response. Thank you! I think I need to work on feeling what the outer front tire is doing on turn in this season because my entry speeds are where I'm losing time the most. Are there some good turns at Sonoma and Laguna Seca to work on this in your opinion?
@teejdrives
@teejdrives 3 месяца назад
@@auslacroix Entry was the last part of the corner I got fast at. Feedback from the steering in this car is about as good as it gets since it's hydraulic, and the biggest reason I don't own a 981. But it's also about understanding how the weight of the car moves around when accelerating/braking/turning, and converting that into correctly timed inputs which is basically impossible to get perfect every time. Laguna: 3,4,5,10 (3 is the hardest to consistently do well IMO) Sonoma: The esses (but be a little careful)
@bernb6610
@bernb6610 3 месяца назад
Great driving. Seems like you're braking later and harder than in the past.
@teejdrives
@teejdrives 3 месяца назад
Probably yeah. Stiffer springs up front now. I've been upping the rebound but still need more.
@PeterSierraRacingSupply
@PeterSierraRacingSupply 3 месяца назад
How are you liking the V730 overall? Last time I ordered tires I was very tempted because they're dirt cheap.
@teejdrives
@teejdrives 3 месяца назад
I like them because they're well rounded. Cheap as you say, and available on TireRack. Not the fastest tire, but "quick enough" to hang with other 200TW tires. Breakaway is middling and suits my style well. I can get them in 255 width fronts. The wear rate has been very good. I've even been driving on them to/from the track, and I think these might go 6 days before running out of tread, but I'll know more after 2 more days at Sonoma next weekend. The only thing I don't like is that they don't seem to deal with heat super well. If I do 2-3 full pace laps there is a noticeable drop in grip even at pressures under 32 psi. Usually I don't notice it as much until pressures get higher (34-36psi), but you know that behavior isn't uncommon in general. I bought them in a search for a quick tire that would last 4 full track days, and I think I've found them.
@PeterSierraRacingSupply
@PeterSierraRacingSupply 3 месяца назад
​@@teejdrives Nice! I'm still burning off my first set of RE-71RS, haven't been out to the track as much this year as I'd like. In terms of wear, heat management, feel, and grip levels, how do you think the two compare? I'm really liking the RE-71RS. They're very fast, and while they do fall off after a couple laps I feel confident pushing them all session (granted, losing 1-2 second off their peak). Wear has been decent on mine, but I have 265/295's stuffed on my wheels so I feel that may be helping. Compared to the RT660's I ran for time attack, these RE-71RS are WAY better with heat, the RT660's would be totally gone by 2 laps for me.
@teejdrives
@teejdrives 3 месяца назад
@@PeterSierraRacingSupply If I had infinite money and could only run 200TW tires I'd pick the RE-71RS and toss them after two days. They are so much fun to drive on when they're fresh. There is nothing I like about the RT660. I only ran a second set because they were free. The RT660 was ~1s slower than the RE-71RS around Thunderhill East for me, and also less fun. The V730 are also probably a second slower than the RE-71RS, with consistency a bit worse (by 1-2 laps??), and much better value than the RT660 (due to both price and wear rate).
@weize9807
@weize9807 3 месяца назад
@@teejdriveshow would you compare 71rs to crs v2?
@teejdrives
@teejdrives 3 месяца назад
@@weize9807 The RE-71RS *feel* better so they seem easier to drive, but I think both tires are basically the same speed. Turn-in specifically is where I had issues with the CRS understeering and having vague feedback. (This could be my car / setup, which I did not adjust much while I was running the CRS.) My notes say, "Figured out I need to be VERY patient and slow when loading up a tire for turn in." The CRS last a day longer for me. I'm trying to decide what to buy next now, and I think I might try another set of the CRS but a wider size on the front this time.
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