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Old 02-24-2016, 12:50 PM   #61
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No real controlled testing but we did finally run our 225/45/15's on a dry track at ACS last weekend. Not many laps but they felt good. Hard to say anything meaningful about grip levels. They seemed to tolerate heat well. They steer nice, better than Rivals. Despite being narrow compared to the other 225's, they stopped really well and had good feedback both under braking and max slip angle cornering. No adverse wear observed. Again, not a thorough evaluation at all, just some small observations based on a session or two goofing around on track.
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Old 02-24-2016, 01:21 PM   #62
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Hey Emillio. I was just curious what kinda lap times do you guys usually run there?
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Old 02-24-2016, 01:27 PM   #63
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Quote:
Originally Posted by slmhofy View Post
Hey Emillio. I was just curious what kinda lap times do you guys usually run there?
In what car?
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Old 02-24-2016, 01:44 PM   #64
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Quote:
Originally Posted by emilio700 View Post
In what car?
Which ever car you ran the V720s on.

Just curious where my personal abilities/car stand within the realm of people who can really drive and also might be useful for others to have an idea what kinda times the tires can do there.
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Old 02-24-2016, 01:56 PM   #65
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Quote:
Originally Posted by slmhofy View Post
Which ever car you ran the V720s on.

Just curious where my personal abilities/car stand within the realm of people who can really drive and also might be useful for others to have an idea what kinda times the tires can do there.
Meaningless without car specs and weather. Give me your car specs and I'll give you a target for ACS

Year chassis
whp
rev limiter
5 or 6 spd
diff ratio
diff type
wheel width & offset
shocks
spring rates
sway bar diameters
alignment
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Old 02-24-2016, 02:56 PM   #66
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Quote:
Originally Posted by emilio700 View Post
Meaningless without car specs and weather. Give me your car specs and I'll give you a target for ACS
Year chassis ('04 MSM)
whp (200WHP)
rev limiter (7500)
5 or 6 spd (6SPD)
diff ratio (3.28)
diff type (Getrag) (Clutch type I think)
wheel width & offset (Your 15x8s)
shocks (Stock MSM Bilsteins)
spring rates (400F/350R)
sway bar diameters (Stock MSM)
alignment (I think -1.5 all the way around.)

Last edited by slmhofy; 02-24-2016 at 03:22 PM.
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Old 02-24-2016, 02:58 PM   #67
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Emilio, I'm going to assume you didn't experience anything similar to the delamination posted in the rx8 thread. And I know you probably didn't test them on the street. But any insight on longevity? Currently trying to decide between zII*s and these and the zII*s are known for their long lasting wear.
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Old 02-24-2016, 09:15 PM   #68
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Quote:
Originally Posted by slmhofy View Post
Year chassis ('04 MSM)
whp (200WHP)
rev limiter (7500)
5 or 6 spd (6SPD)
diff ratio (3.28)
diff type (Getrag) (Clutch type I think)
wheel width & offset (Your 15x8s)
shocks (Stock MSM Bilsteins)
spring rates (400F/350R)
sway bar diameters (Stock MSM)
alignment (I think -1.5 all the way around.)
Assuming the same V720 on the same day/weather I ran and your car weighing about 2400# and the brakes don't fade, I think I could do a 1:55 or so in your car. You sure 3.28 is the right diff? Doesn't sound right.

Quote:
Originally Posted by aidandj View Post
Emilio, I'm going to assume you didn't experience anything similar to the delamination posted in the rx8 thread. And I know you probably didn't test them on the street. But any insight on longevity? Currently trying to decide between zII*s and these and the zII*s are known for their long lasting wear.
You think I wouldn't mention it if they had fallen apart? No idea on wear rates, sorry. They seem soft, dunno.
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Old 02-25-2016, 10:24 AM   #69
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Quote:
Originally Posted by aidandj View Post
Emilio, I'm going to assume you didn't experience anything similar to the delamination posted in the rx8 thread. And I know you probably didn't test them on the street. But any insight on longevity? Currently trying to decide between zII*s and these and the zII*s are known for their long lasting wear.
Judging by how they looked on a local FRS after a couple events they'll wear faster than the ZII*S
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Old 02-28-2016, 01:03 PM   #70
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Spent the day on the 720's yesterday on the ND. 245 tire on 17x9. 80* F ambient, surface temp ~105* F

We did this twice: Three sessions/drivers back to back, close to 60 minutes of straight use, with just two 4-5 minute gaps of cool-down while we swapped drivers. The tires felt solid throughout with just a bit of a fall-off if you overdrove them for several laps, but bring slip angles back in check and the tires were good just half a lap later. Never had a point where they got greasy and needed a substantial cool-down.

Sean also did two 20min sessions separately, so we put 8 total sessions on the tires.

Rear:



Front Right - we ran CCW, so this was the corner that took the most abuse. Overall normal wear except, and it's hard to see, but the center block was worn noticeably more on the outer half than the inner half. The Front Left tire did not show the same wear:



No back to back testing with other tires so all I can say is they feel sticky. Probably not RE71R level, but quick. Very strong in braking, which is nice to see in a "street" tire. They don't talk to you much, with just a bit of a howl if you're full-on sliding. Predictable when slipping though.
Attached Thumbnails
Kumho V720-acf4fdc0-50cf-4e3e-b471-dd0008558175_zpsevqyvafc.jpg   Kumho V720-29317275-eedb-490e-bd25-ac7df79dcc04_zpsn2adcpsl.jpg  
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Old 02-28-2016, 02:50 PM   #71
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I'm glad I got the rc1s instead.
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Old 02-28-2016, 08:52 PM   #72
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The wear shown on the V720's is about typical for the "special" 200tw's. RE71-R's and Rival-S will feather like that when run hard from full tread, even with lots camber.
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Old 04-01-2016, 03:00 PM   #73
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I've been reading some good and bad things about these tires.

Sav has me worried with -
Quote:
Originally Posted by Savington View Post
From what I've heard, the V720 is noisy on the road and highly prone to tread chunking on track. Avoid.
I just need a tire that will last a whole year of occasional street/mountain driving (2000 miles) and maybe 6-12 HPDE sessions for fun/ride alongs/downpour events.

Would I be better off with the 245/40/15 VR-1 on my 15x9s for the tires relatively non-competition purposes?
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Old 04-01-2016, 03:21 PM   #74
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IMO, for NBs, the VR-1 should be a no-brainer. Similar speed potential to the 225 RivalS and far better life expectancy. For NAs, it's more of a toss-up, since you have to hammer on the car to get the 245/10" combo under it.
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Old 04-01-2016, 05:12 PM   #75
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My old car was so loud I never noticed the noise. Now that I put them on a stock miata they howl like a mud terrain tire.
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Old 04-02-2016, 12:10 AM   #76
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Despite the tread separation reviews I picked up a set in 225/45-15. I needed a 200TW tire for a regional time attack/fast auto-x series, so they won't see the prolonged heat that seems to plague them, just a bunch of repeated short bursts. I guess time will tell on the durability. I'll be putting some mountain roads under them, and maybe an open lapping day or two as well.

Pics below are mounted on 15x8 Kosei K4R, comparison pic is 205/50-15 Federal 595RS-R on 15x7. I really like the Fed's but the treadwear is marked 140 so they weren't legal for the series. First race is this weekend so I'll see how they feel.

Can confirm the noise, they are by far the loudest tire I've ever had on this car.



Attached Thumbnails
Kumho V720-80-15x8v720_3184f3ebe2afdafd48cffdc9aa562afdf69d458f.jpg   Kumho V720-80-v720vs595rsr_22df39863d979f28f4a13b72c2c4cfa623f74d17.jpg  
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Old 05-01-2016, 11:23 AM   #77
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This is from some friends' of mine Lemons car,the V6 Geo at around 2200lbs wet 180-200hp I believe.



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Kumho V720-wxevgfl.jpg   Kumho V720-yyoulbf.jpg  
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Old 05-01-2016, 01:39 PM   #78
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Looks like they flat spotted it pretty bad a couple of times, not sure that's the fault of the tire
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Old 05-01-2016, 02:07 PM   #79
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I just see wear. No immediate indication of a flaw in the tire itself. I'm going to guess the Metro had perhaps less that optimized damping, roll stiffness, camber control, etc.
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Old 05-01-2016, 02:17 PM   #80
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That's what I see too, and in fact, the center rib which is the spot really under scrutiny for this tire looks OK.
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