Considering move from Hoosier R7 to Hankook Ventus Z214 51
07-31-2016, 11:25 AM
#46
Rennlist Member
Toyo RR
"Toyo RR is a really good tire." +1 ....from what I have observed at some of our favorite tracks, 2 seconds a lap. Too bad they don'r make the RR in 18". 
I'll just have to continue on with my Nitto NT-01 tires. As I continue to harp, 33% less $ than Hoosiers and are in their effective stickiness band for at least 20 heat cycles...albeit a little slower on the lap times.
I'll just have to continue on with my Nitto NT-01 tires. As I continue to harp, 33% less $ than Hoosiers and are in their effective stickiness band for at least 20 heat cycles...albeit a little slower on the lap times.
07-31-2016, 10:46 PM
#47
Former Vendor
Join Date: Feb 2008
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"Hoosiers recommends 4 PSI increase of left rear at Cali Speedway. That would be RIGHT REAR
The track is run counterclockwise, so the load is on the right rear. This is a scary track...but I seem to go back at least 1X per year. Only one incident to date...blew a right rear Toyo 710 coming out of turn 2 at 125mph ish...did three 360 snap spins and didn't hit anything. Disintegrating tire ate the rear fender liner and broke the 993RS side skirt.
Lucky to walk away unscathed.
The track is run counterclockwise, so the load is on the right rear. This is a scary track...but I seem to go back at least 1X per year. Only one incident to date...blew a right rear Toyo 710 coming out of turn 2 at 125mph ish...did three 360 snap spins and didn't hit anything. Disintegrating tire ate the rear fender liner and broke the 993RS side skirt.
Lucky to walk away unscathed.
08-01-2016, 03:29 PM
#52
Rennlist Member
That's the problem, 275/35/18 is the only size...nothing for the fronts. $285 a tire..If they made a 245/40 for the front I'd be all over it.
RR is the Spec Boxster tire....most of the drivers are 2 seconds quicker compared to the Toyo DOT 100 tires.
RR is the Spec Boxster tire....most of the drivers are 2 seconds quicker compared to the Toyo DOT 100 tires.
08-03-2016, 02:10 AM
#53
Three Wheelin'
Thanks for the above replies. Would you need to increase the right rear AND front tires by 4-5 psi and if so, how much would that affect the handling on the infield portion of the track? Also, how critical is decreasing the camber to 2.0 or less if you make the pressure adjustments? I recently used the Z214s at Willow Springs with the lower camber settings and had DRAMATIC outside tire wear on the left front and to lesser extent left rear in 3 short sessions( so bad that my race shop contacted Hankook to see if this was a tire defect).In my class I can always use the NT01s ( and then take 130+pounds off my car weight somehow)but I doubt that would yield comparable lap times to Z214s or R7s.
Also, adding 130 lbs and decreasing negative camber is not going to help things in terms of outside edge tire wear. . . .
Chris A.
08-03-2016, 03:12 AM
#54
Instructor
Join Date: Jun 2009
Location: Southern California
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Willow Springs isn't a banked track and I'm sure that the excessive Hankook tire wear was due to not enough camber. My car is relatively new to me , set up has been a work in progress and the camber has subsequently been increased. My point is that if you have to decrease the camber at Autoclub Speedway(which is a banked track ) to low levels to prevent tire failure then you're just going to get extreme wear from insufficient camber which itself will contribute to tire failure( which I already demonstrated at WSIR). So R7s and Z214s are not really an option at Autoclub Speedway.The 130 lbs has nothing at all to do with tire wear. It has to do with tire alternatives.If I use less sticky tires such as NT01s, then POC GT class rules allow me to take 130 lbs off my car( though how easy is that to do for just one track?) My point was that my car minus 130 lbs on NT01s wouldn't be near as fast as the current weight on R7s or Z214s. So no great solution except maybe skip ACS and wait for Buttonwillow.
08-03-2016, 06:41 AM
#55
08-03-2016, 09:24 AM
#57
Rennlist Member
I am starting to see issues with John Colliers 993 now that it is running GT5 at 3200 pounds. He always ran 26-28 psi cold at 3000 pounds stock g class weight. The car is now blistering the rear tires in 8-10 heat cycles, especially the left rear and only on the outside edges. It looks like it needs to start 3-4 pounds higher cold with a target of 38-39 psi hot. He has run Hankooks for years and occasionally had issues with the left rear, but it looks like the heavier weight is accelerating the issue.
08-15-2016, 11:15 PM
#59
Burning Brakes
Hi Dave - would you have any similar recommendations for suspension set-up? I've also got a ~3000# Boxster S currently running Hoosier R7s, but will be trying Hankook Z214s this upcoming weekend. Anything specific you might suggest in adjusting the suspension for this change? Thanks.
08-15-2016, 11:37 PM
#60
Rennlist Member
Hi Dave - would you have any similar recommendations for suspension set-up? I've also got a ~3000# Boxster S currently running Hoosier R7s, but will be trying Hankook Z214s this upcoming weekend. Anything specific you might suggest in adjusting the suspension for this change? Thanks.