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Old 05-16-2009, 07:36 PM   #1
yzer
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Default Kumho Ecsta XS is No.1 in GRM Test

I thought these XSs were quite a lot better than MX.

June '09 issue of Grassroots Motorsports tests six extreme summer performance tires under autocross conditions. Andy Hollis was the driver. Hollis described the winning qualities of the XS: "It is the complete package of inspiring turn-in, very high grip, easy modulation and good feedback."

Ecsta XS had the fastest mean time and the fastest quick time. Ranked from first to last:

Kumho Ecsta XS
Bridgestone Potenza RE-11
Bridgestone Potenza RE-01R (discontinued)
Toyo Proxes R1R
Dunlop Direzza Sport Z1 Star Spec
Falken Azenis RT-615
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Old 05-17-2009, 02:53 PM   #2
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Wow, so GRM is saying the Kumho Ecsta XS is the best current tire in Auto-X conditions huh? Hmmm....I might have to find a copy of GRM (unless someone has a link to the article) and see how they came up with everything.

Ah man, looks like there are 2 other tires that are new now that are going to throw a wrench into the decision making time for new tires.

Yokohama Advan Neova AD08
Hankook Ventus R-S3

Dang, now I have to find information on how those tires stack up to the others (well, basically the RE-11, Star Specs & now Ecsta XS).
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Old 05-17-2009, 03:04 PM   #3
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Quote:
Originally Posted by flukewrx View Post
Wow, so GRM is saying the Kumho Ecsta XS is the best current tire in Auto-X conditions huh? Hmmm....I might have to find a copy of GRM (unless someone has a link to the article) and see how they came up with everything.

Ah man, looks like there are 2 other tires that are new now that are going to throw a wrench into the decision making time for new tires.

Yokohama Advan Neova AD08
Hankook Ventus R-S3

Dang, now I have to find information on how those tires stack up to the others (well, basically the RE-11, Star Specs & now Ecsta XS).
they are doing another test which has those 2 tires included
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Old 05-17-2009, 03:52 PM   #4
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qualities that make a tire good for autox do not necessarily make it a good dd tire

in fact....the xs and the rt-615 are targeted specifically at autox and the others in that comparison are meant to be 'street' tires....
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Old 05-17-2009, 04:47 PM   #5
IheartMY
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just got these tires from tirerack along with some hawk hp+ pads. I must say the tire compound is very soft and and grippy. the kumho XS def have a bit more road noise compared to a stock re92 but the trade-off for handling completly outweights the MINIMAL (IMO) road noise these exhibit. the cost of these tires is also great as i paayed $117 per tire while others in the same size/catagory where above this. DD driving on these tires should not be an issue( unless u are extremely anal about road noise and treadwear, but then you probably wouldnt be looking at a performance tire). I cant wait to try out these tires in this upcoming weekends Auto-X, will report back with how they handle. I will say though my daily encounters with on/off ramps are def much more fun .

FYI: +1 to tire-rack and the stickied number for luke! fast, hassle free service and a donation to keep this site up and running.
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Old 05-17-2009, 09:25 PM   #6
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Isn't the Nitto NT-05 supposed to be in the same class as the other tires mentioned? I wonder how it would compare.

Last edited by mav1c; 05-18-2009 at 05:34 PM.
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Old 05-18-2009, 03:37 PM   #7
flukewrx
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Quote:
Originally Posted by mav1c View Post
Aren't the Nitto NT-05 and Toyo R1R supposed to be in the same class as the other tires mentioned? I wonder how they'd compare.
Quote:
Originally Posted by yzer View Post
I thought these XSs were quite a lot better than MX.

June '09 issue of Grassroots Motorsports tests six extreme summer performance tires under autocross conditions. Andy Hollis was the driver. Hollis described the winning qualities of the XS: "It is the complete package of inspiring turn-in, very high grip, easy modulation and good feedback."

Ecsta XS had the fastest mean time and the fastest quick time. Ranked from first to last:

Kumho Ecsta XS
Bridgestone Potenza RE-11
Bridgestone Potenza RE-01R (discontinued)
Toyo Proxes R1R
Dunlop Direzza Sport Z1 Star Spec
Falken Azenis RT-615
mav1c - Aren't those the tires you are talking about or is there another R1R tire from Toyo?

I've heard great things about the R1R tires, but I have not seen any companies that sell the R1R. I always see the older T1R and those are definitely not the same tires.
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Old 05-18-2009, 05:35 PM   #8
mav1c
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Ha. Me = Blind.

Fixed.
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Old 05-18-2009, 10:07 PM   #9
yzer
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I haven't seen the GRM article online, just the magazine.

GRM said they would like to test some other tires this summer including RS3, NT05, AD08 and 595RS-R.

GRM said XS was neither the widest or the softest compound tire in the test. They commented on R1Rs "awesome grip" but also said R1R had slower turn-in, was a bit hard to control at the limit and showed abrupt breakaway.

Uncle Scotty: XS will be a fine highway tire, just like MX. I drove 3 sets of those prior to the XS. A lot of drivers got 40K+ out of the MX (I got 42K from one set) and I've a feeling folks will be getting 30K+ DD miles from XS. Of course, you can burn off these tires much faster if you want, it just matters how hard you drive them. XS is a street tire that is designed to be competitive at SCCA street tire events. XS is "targeted specifically at autox" and targeted specifically as a performance street tire. If you look at the way Kumho initially targeted the MX you will see that the XS is marketed exactly the same way. Before XS, MX was listed on the Kumho web site under two categories: competition tire and performance tire. Now that XS has come along it is listed as a competition tire and a performance tire and the MX is listed as a performance tire only.

Extreme performance summer tires make excellent road tires for performance cars given the driver knows and understands the limitations of the category. EPS tires are not comfy-riding, quiet, high mileage all-seasons. They are just intended to drive like all gitout on the dry and offer respectable performance on the wet.

Last edited by yzer; 05-18-2009 at 10:32 PM.
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Old 05-19-2009, 12:56 AM   #10
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The RE-01R is much more comfortable than my old KDWs, I'll tell you that. The XS may be an "all-out" kind of tire but the Bridgestones on that list are very easy on your rear end for daily use.
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Old 05-19-2009, 03:33 AM   #11
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Good performance tires don't have to be as hard as rocks. Part of it is relative to what a driver considers hard, I guess. The XS rides harder than the MX but I have driven way more jolting tires before. They warm up fast and once they do the ride isn't that bad. XS seems like a pretty quiet tire when new but give them 500-1000 miles and you'll be hearing from them.
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Old 05-19-2009, 03:46 AM   #12
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I did expect good things from the XS. Even the step down SPT is a competent performance tire, even acceptable for auto-x use with decent grip and good wear.
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Old 05-19-2009, 04:08 AM   #13
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Quote:
Originally Posted by yzer View Post

GRM said they would like to test some other tires this summer including RS3, NT05, AD08 and 595RS-R.
Sweet if they keep all the tires from this test & add all of those tires that will be exactly what I am looking for.

I think I need to get a subscription to GRM.
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Old 05-19-2009, 04:12 AM   #14
yzer
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Detail, details.

I don't think the GRM test was anywhere near conclusive regarding the Star Specs.

The shootout was run on Hollis' '89 Civic Si.

XS, RT-615, R1R and RE-11 were all 205/50R15. That size was not available for the two other tires. Star Spec was 195/55R15: more narrow, taller sidewall and larger diameter. That’s quite a disadvantage. GRM had nothing but good to say about the tire and stated that size mattered in their result. The RE-01R was 195/50/15: more narrow and an advantage with smaller diameter.

It really doesn't matter all that much with the RE-01 as it is no longer available. But there are still questions as to whether Star Spec > RE-11 or > XS. I guess we'll have to wait for a test with all three at a hopefully larger size. At any rate, at least one test has shown that the XS outran RE-11. I haven't seen same size track comparisons of Star Spec v. RE-11 yet.
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Old 05-19-2009, 04:30 AM   #15
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I would have thought the new RE-11's would be the winner.. but our RE-11's are different from the japanese version.
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Old 05-20-2009, 12:49 PM   #16
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Some of the GRM shootout parameters:

Test course: Driveway Austin. New purpose-built track. Smooth surface.

Test car: '89 Civic Si owned by one of the drivers: Andy Hollis. The car was fastest in 2008 Solo National Championships.

Weather: Low to mid-60s, low humidity on a sunny day.

Tire prep and run details: Tires were inflated per best specs for each tire. All tires shaved to 3/32" for maximum dry track performance. Each tire was scrubbed-in and given a heat cycle.

Track break-in factor. The RT-615s were run as a benchmark tire. They ran four runs first and four runs last to make sure track break-in wasn't a significant factor.

Timing: AXWare

Last edited by yzer; 05-21-2009 at 01:58 AM.
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