SCCAForums.com

I need some Input on these new Dunlop.  

 New Street touring Class tire.

Dunlop Direzza Sport Z1

 

The Z1 is not legal for ST yet, right?

 Dave

---

#76 STU Evo

I wonder if the compound is similar to the Falken RT-615, since they are both made by Sumitomo.

 The tire is supposedly big in Japan:
http://www.direzza.jp/z1/z1.html

They wouldn't be legal for this year, due to not making the deadline, but the are legal for next season so far.

-Brian

 

---

89/189 STS/STX '89 Civic Si

They need more sizes!

---

Tom Buckley
1991 Civic Si

They make a 225/45/16!!  If that were to come to the US I would be doing some good testing vs the 235/40/17 I currently run...

Shorter tire for better gearing and lower the car's CG a bit, while hopefully sacrificing very little in the tread department while still maintaining a stiff sidewall?  Could be good :)

 

Ryan 

---

Ryan
'94 Mazda MX6 2.5L V-6
STX Prep:
OPM LSD [] TEIN [] Traklite2 17x8 [] Neovas [] SCHROTH [] Hawk HP+ [] AWR [] HotShot [] Magnaflow [] 6-2-1 Headers

Here a pic comparing the new Direzza Z1, RE-01R, Neova, and 615.  245/40-17 size.

Some initial observations:

- The Z1 and the Neova have a 9.5" tread width, the RE-01R is approximately 9.0" wide if shaved.

- The Z1 weighs 26.4 lb.

- Using the super accurate thumbnail durometer, the RE-01R felt the softest.

- The unmounted carcass of the Z1 felt at least as stiff, if not more so than an unmounted Neova, tested by sitting on the tires.

SS RX7 R2:

Here a pic comparing the new Direzza Z1, RE-01R, Neova, and 615. 245/40-17 size.

Some initial observations:

- The Z1 and the Neova have a 9.5" tread width, the RE-01R is approximately 9.0" wide if shaved.

- The Z1 weighs 26.4 lb.

- Using the super accurate thumbnail durometer, the RE-01R felt the softest.

- The unmounted carcass of the Z1 felt at least as stiff, if not more so than an unmounted Neova, tested by sitting on the tires.

How heavy are the other tires? (just because often heavy = stiff sidewalls)

---

John W: 2003 WRX: STX (and sometimes 1991 MR2: ES)
Washington, DC Region

I see a set of the Z1s in my future after i wear out the Stones. Unless someone wants to buy some nice 245/40-17 RE-01Rs that have been bagged for the last 2 months in my 75 degree spare bedroom lol

---

David Hedderick
Pearland (Houston), TX
01 CRG YZ125 (FOR SALE! $2500)
08 Mazda 3s
02 Mazda Protege (automatic tow vehicle)
92 Miata SE - Fun half-arsed STS2 Car

trojan9x:

They need more sizes!

Yea, they're all too narrow!  

Dave G. 

thanks, i couldn't find the tread width specs anywhere

SS RX7 R2:

- The Z1 and the Neova have a 9.5" tread width, the RE-01R is approximately 9.0" wide if shaved.

---

stx 95 talon awd, stu 95 m3

so how do you like these tires?

I saw several sets of Z1s being tested at an autocross on Oct 1st. They were given to some BMWCCA racers for O'Fest. At full tread they chunked (so shave them, of course) but they seemed pretty quick. When/if we get a chance to drive and/or test a set we will post it. From the times these cars were running they don't seem "uber" like tires but they don't seem slow, either. Another option.

---

Terry Fair - www.vorshlag.com - www.ast-usa.com
'93 E36-LS1 (XP), '97 BMW M3 (so long STU!), '91 318is (STS)

I've only had a day or two of street driving on the Z1s. Fun to slide around with very little roll-over. They don't understeer as much as the RE-01Rs. Not as mushy as a some of the others.

any update on these tires ??

 Thanks

focus_wrc:

any update on these tires ??

 Thanks

I know of several STU drivers testing these in the near future. I wish they made more sizes, of course!

---

Terry Fair - www.vorshlag.com - www.ast-usa.com
'93 E36-LS1 (XP), '97 BMW M3 (so long STU!), '91 318is (STS)

Rick-

 

Will you be running these tires at the CSCC event at CSW this coming weekend?  I'll stop by and chat.

 PS-- the 195/55-15 has very similar size specs to the RT-615 205/50-15, and last week were $80 each on TireRack, now $84 each.
 

---

*Banned Again* Permanently

SS RX7 R2:

I've only had a day or two of street driving on the Z1s. Fun to slide around with very little roll-over. They don't understeer as much as the RE-01Rs. Not as mushy as a some of the others.

Still probably have some mold release on them, and haven't had a chance to test once they're up to temp. Hope to test begining of next month.

First impressions are that the compound probably has less ultimate grip than the top two tires, Neova and RE-01R, but the Z1s could be better than the rest due to the tire construction.

Thats good to hear, when I told some people about this tire on a local forum they all agreed that the tire was trash because it was made by Dunlop and had a treadwear of 200. Let us know how your times fare at your next event. Me and maybe a few local guys might pick up on these.

---

Damon Cuccia

2007 TLAC ESP class champion
2007 TLAC Open Class Top 10 finisher

---

Aytinc

Nice find.  Looks like GRM has some more work to do.  I'd have to see a lot of amazing data on some of these new tires to pursuade me a way from the Yok's though.  The Dunlop's do look pretty good in the wet.

Next year might be interesting!

James

---

2007 STU National Champ