Kumho V710's- first test

Jas00x · 04-13-2005, 05:19 PM

Ok guys, got the V710's mounted and on track this past weekend for the Atlanta National Tour.
First off, getting them mounted is not easy. I ended up at Discount Tire because they were the only shop that had a tire mounter with a "bead spreader". Even with the nice machine, it took 2 hours to mount the set.

The event was in Atlanta- asphalt surface, kinda bumpy, the course was fairly tight sweepers with a little slalom- virtually no transistions to throw the car around. The temps were in the low 70's and I ran in the 3rd heat so the course was pretty clean and warm.

The grip of the tire feels great- probably better than the Hoosiers, and off the line the tires seem to hook up really good. Since the course was so tight I can't comment on how well the tire transistions compared to the Hooiser.

As far as tire pressures: I ended up running 40# up front and 34# in the back. With the V700s and Hooisers I'd typically run 42 up front and 37 in the back. I also ended up running a little more toe out in the back, but I think that was more to accomodate the course design. By the 3rd run on Sunday, I felt much better about the setup and I think I'm on the right track with the lower pressures on these tires.

We've got the ProSolo this weekend so that should give me some good testing time.

creamfan · 04-13-2005, 05:27 PM

Nice. Hey i was wondering not to hijack the thread But would the Potenza SO3's in a 215/55/16 be better the my 225/50/16's for autocross and streety driving. The overall diamiater is bigger then the 225 i cant seem to figure that out. Would the 215/55/16 be a better fit on my stock wheels?

Jas00x · 04-13-2005, 06:10 PM

Quote:

Originally Posted by creamfan

Nice. Hey i was wondering not to hijack the thread But would the Potenza SO3's in a 215/55/16 be better the my 225/50/16's for autocross and streety driving. The overall diamiater is bigger then the 225 i cant seem to figure that out. Would the 215/55/16 be a better fit on my stock wheels?

If the 225's are shorter and wider..what's there to debate? The 225's should fit fine and wear really well.

Josh · 05-05-2005, 07:16 PM

Any more updates or info on these?

Jas00x · 05-05-2005, 10:55 PM

I just ran them two weeks ago at the Gainesville race, and they seem to work great. They are wearing much better than the Hoosiers, but then again, you can't get much worse! So far I have 22 runs (all asphalt) on them and they look fine.
At the Gainesville race I finished 2nd in GS- .1 secs behind a 05 CooperS on brand new Hoosier AS05's. Overall, I PAXed 4th out of 103 drivers (1st place was John Thomas in a FP car, 2nd was a BS car, and 3rd was the CooperS).
I also did some temperature testing on them. I was running 41# up front and 34# in the back. An interesting note about the 710's is that they heat up very quickly. On a cool day (for florida) high 60's/ low 70's, I was able to get the tires warmed up nicely. After the first run, pressures jumped up 4# front and rear.
The Front tires were running a little hot in the middle, which suggests that the pressure is too high- but you can't go lower than 41# without rolling the corner of the tire. So I think the 215, is probably a bit small for our car. When I ran the 225 V700's, they were more even across the front, so I think the 225 is probably a better size for the front.
On the back, the tires read fairly even (although about 20 degrees cooler than the front), with the outer edges getting slightly hotter than the inner. That is fairly typical for fwd that is set up with oversteer in mind.

I think the 710s are probably the best R-compound for FWD. They won't last as long as the V700's, but they do have better grip.

Josh · 05-06-2005, 12:00 AM

Great thanks. I'm looking into getting these.

zeroryde · 05-06-2005, 07:37 AM

well with the V700's you'd have to shave them anyway to prevent that premature wear, so I guess they'd probably be the same or close to it in wear..

Joeycurl · 05-06-2005, 11:31 AM

I can't wait to get out and try my victoracers on 5/14. I'm going to try your tire pressure setup Jason and see how things go. I'm running -.8deg camber up front with about .25deg toe out. The rears I left alone for now.

Jas00x · 05-09-2005, 07:32 PM

I find that the rear toe out makes a big difference, and I keep the fronts close to zero or just a little out. Depending on how comfortable you are with adjusting alignment at the track, it is really easy to adjust the rear toe and I'd recommend trying it sometime. Since the the cam-shaped plate on the bolt has marks, you can just mark where it was zero toe for street driving and set it back after you are done racing.

edw-R · 05-09-2005, 10:58 PM

What tyre pressure are you running? I always run 25-26 psi on the semi-slick tyre.

Joeycurl · 05-10-2005, 11:30 AM

Quote:

Originally Posted by Jas00x

I find that the rear toe out makes a big difference, and I keep the fronts close to zero or just a little out. Depending on how comfortable you are with adjusting alignment at the track, it is really easy to adjust the rear toe and I'd recommend trying it sometime. Since the the cam-shaped plate on the bolt has marks, you can just mark where it was zero toe for street driving and set it back after you are done racing.

I'll look into that on Saturday...your talking about the bolt on the upper link,right?

Jas00x · 05-10-2005, 07:10 PM

Quote:

Originally Posted by Joeycurl

I'll look into that on Saturday...your talking about the bolt on the upper link,right?

Actually I think it is the lower link. If you are looking at the back of the car, The toe adjuster bolt is low right by the tire. It has a 17mm nut, and a 15/16" nut which has a cam shaped plate with 5 or 6 marks on it. You loosen the 17mm nut, and turn the cam nut with a 15/16" wrench.

[DC530] · 05-10-2005, 08:39 PM

Thanks for the review. I ordered a set and it should be here in June, hopefully in time for the regionals.

Can you comment briefly on the turn-in response and feel? I find that the V700 feels very good at the limit, very good for a FWD of its (RSX) weight. I didn't shave mine and they seem to wear pretty evenly (over 100 runs now and still good). I got a lot of camber up front though.

I decided to get the V710's instead of the Hoosiers S04 because I heard the wear is much better. I'm glad you agree too.

May I ask how much toe you put in the back?

Jas00x · 05-11-2005, 10:15 PM

Its hard for me to compare turn-in on the V700s to the V710's since I've just run the 215-40 in the 710's and the 225-50 on the V700's. The turn-in is better than the V700s, but not as good as the old Hoosier AS03's. However, overall grip on the 710's seems to be better and off the line accelleration seems to be better than both the 700's and Hoosiers.
For Alignment I like the front toe at about 1/16" or 1/8" out, and the rear toe to be 3/16" or 1/4" out. I wouldn't start with that much toe, first try 1/16" or 1/8", then dial it out as you find comfortable with your setup. There are little marks on the bolt, try moving it one mark at a time (equal on both sides of course).

[DC530] · 05-12-2005, 02:34 AM

Thanks.

One more thing. How's the slip angle? Pretty easy to grasp?

04-13-2005, 05:19 PM	#1
Jas00x Senior Member Join Date: Mar 2004 Location: Alpharetta, GA Posts: 358 iTrader: (2)	Kumho V710's- first test Ok guys, got the V710's mounted and on track this past weekend for the Atlanta National Tour. First off, getting them mounted is not easy. I ended up at Discount Tire because they were the only shop that had a tire mounter with a "bead spreader". Even with the nice machine, it took 2 hours to mount the set. The event was in Atlanta- asphalt surface, kinda bumpy, the course was fairly tight sweepers with a little slalom- virtually no transistions to throw the car around. The temps were in the low 70's and I ran in the 3rd heat so the course was pretty clean and warm. The grip of the tire feels great- probably better than the Hoosiers, and off the line the tires seem to hook up really good. Since the course was so tight I can't comment on how well the tire transistions compared to the Hooiser. As far as tire pressures: I ended up running 40# up front and 34# in the back. With the V700s and Hooisers I'd typically run 42 up front and 37 in the back. I also ended up running a little more toe out in the back, but I think that was more to accomodate the course design. By the 3rd run on Sunday, I felt much better about the setup and I think I'm on the right track with the lower pressures on these tires. We've got the ProSolo this weekend so that should give me some good testing time. __________________ -Jason '02 Blue Type-S G Stock

04-13-2005, 05:27 PM	#2
creamfan Porsche Club of America Join Date: Apr 2004 Location: Long Island, NY Posts: 1,233 iTrader: (3)	Nice. Hey i was wondering not to hijack the thread But would the Potenza SO3's in a 215/55/16 be better the my 225/50/16's for autocross and streety driving. The overall diamiater is bigger then the 225 i cant seem to figure that out. Would the 215/55/16 be a better fit on my stock wheels? __________________ 2004 ABP Type-S 61K Miles Original Owner 2007 Subaru Legacy 2.5GT Limited 5MT

05-05-2005, 10:55 PM	#5
Jas00x Senior Member Join Date: Mar 2004 Location: Alpharetta, GA Posts: 358 iTrader: (2)	I just ran them two weeks ago at the Gainesville race, and they seem to work great. They are wearing much better than the Hoosiers, but then again, you can't get much worse! So far I have 22 runs (all asphalt) on them and they look fine. At the Gainesville race I finished 2nd in GS- .1 secs behind a 05 CooperS on brand new Hoosier AS05's. Overall, I PAXed 4th out of 103 drivers (1st place was John Thomas in a FP car, 2nd was a BS car, and 3rd was the CooperS). I also did some temperature testing on them. I was running 41# up front and 34# in the back. An interesting note about the 710's is that they heat up very quickly. On a cool day (for florida) high 60's/ low 70's, I was able to get the tires warmed up nicely. After the first run, pressures jumped up 4# front and rear. The Front tires were running a little hot in the middle, which suggests that the pressure is too high- but you can't go lower than 41# without rolling the corner of the tire. So I think the 215, is probably a bit small for our car. When I ran the 225 V700's, they were more even across the front, so I think the 225 is probably a better size for the front. On the back, the tires read fairly even (although about 20 degrees cooler than the front), with the outer edges getting slightly hotter than the inner. That is fairly typical for fwd that is set up with oversteer in mind. I think the 710s are probably the best R-compound for FWD. They won't last as long as the V700's, but they do have better grip. __________________ -Jason '02 Blue Type-S G Stock

05-06-2005, 07:37 AM	#7
zeroryde party wrecker Join Date: Mar 2002 Location: nyc Posts: 9,250 iTrader: (7)	well with the V700's you'd have to shave them anyway to prevent that premature wear, so I guess they'd probably be the same or close to it in wear.. __________________ March 2002 - November 2007: 2002 ABP RSX-S (sold) Dec. 2007: 2008 DGM Legacy GT 2008 Suzuki SV650N motorcycle crew#3.14*

05-09-2005, 07:32 PM	#9
Jas00x Senior Member Join Date: Mar 2004 Location: Alpharetta, GA Posts: 358 iTrader: (2)	I find that the rear toe out makes a big difference, and I keep the fronts close to zero or just a little out. Depending on how comfortable you are with adjusting alignment at the track, it is really easy to adjust the rear toe and I'd recommend trying it sometime. Since the the cam-shaped plate on the bolt has marks, you can just mark where it was zero toe for street driving and set it back after you are done racing. __________________ -Jason '02 Blue Type-S G Stock

05-05-2005, 07:16 PM	#4
Josh Banned Join Date: Nov 2004 Location: Oregon Posts: 7,769 iTrader: (0)	Any more updates or info on these?

05-06-2005, 12:00 AM	#6
Josh Banned Join Date: Nov 2004 Location: Oregon Posts: 7,769 iTrader: (0)	Great thanks. I'm looking into getting these.

05-06-2005, 11:31 AM	#8
Joeycurl SOLO II Join Date: Jul 2004 Location: Up and Down Cali Posts: 534 iTrader: (4)	I can't wait to get out and try my victoracers on 5/14. I'm going to try your tire pressure setup Jason and see how things go. I'm running -.8deg camber up front with about .25deg toe out. The rears I left alone for now.

05-09-2005, 10:58 PM	#10
edw-R Senior Member Join Date: Dec 2004 Location: Brisbane Posts: 421 iTrader: (1)	What tyre pressure are you running? I always run 25-26 psi on the semi-slick tyre.

05-10-2005, 08:39 PM	#13
[DC530] Master Member Join Date: Nov 2002 Location: Burnaby, BC Posts: 1,569 iTrader: (0)	Thanks for the review. I ordered a set and it should be here in June, hopefully in time for the regionals. Can you comment briefly on the turn-in response and feel? I find that the V700 feels very good at the limit, very good for a FWD of its (RSX) weight. I didn't shave mine and they seem to wear pretty evenly (over 100 runs now and still good). I got a lot of camber up front though. I decided to get the V710's instead of the Hoosiers S04 because I heard the wear is much better. I'm glad you agree too. May I ask how much toe you put in the back?

05-11-2005, 10:15 PM	#14
Jas00x Senior Member Join Date: Mar 2004 Location: Alpharetta, GA Posts: 358 iTrader: (2)	Its hard for me to compare turn-in on the V700s to the V710's since I've just run the 215-40 in the 710's and the 225-50 on the V700's. The turn-in is better than the V700s, but not as good as the old Hoosier AS03's. However, overall grip on the 710's seems to be better and off the line accelleration seems to be better than both the 700's and Hoosiers. For Alignment I like the front toe at about 1/16" or 1/8" out, and the rear toe to be 3/16" or 1/4" out. I wouldn't start with that much toe, first try 1/16" or 1/8", then dial it out as you find comfortable with your setup. There are little marks on the bolt, try moving it one mark at a time (equal on both sides of course). __________________ -Jason '02 Blue Type-S G Stock

05-12-2005, 02:34 AM	#15
[DC530] Master Member Join Date: Nov 2002 Location: Burnaby, BC Posts: 1,569 iTrader: (0)	Thanks. One more thing. How's the slip angle? Pretty easy to grasp?