Switching from R6 to Slicks
#16
Rennlist Member
If you're going to test with the 8' & 10' here's what I would suggest....
Yokohama's are $100. less per set. I'd try their 230/650/18 front @ $360. per. I would use their 01 compound which is part # N2076. For rears I'd use their 280/650 @ $412. per. I would use their 02 compound which is part # N2390. Total cost of $1,544. + taxes, etc.
Note: The Yoko 230 front is the same size as Hoosier's 250 front. 9.72 section width vs 9.8, and tread widths of 9.06 vs 9.1. You can see that on the charts I posted previously...
For Hoosiers, I'd use their 250/650 front # 43825 in their R80 compound @ $ 409. per
For rears I'd try their 285/645 # 43855 also in their R80 compound @ $ 460. per. Total cost of $ 1,642.
Club Sports are great shocks, I use them too. What spring rates are you running with them?.....
Yokohama's are $100. less per set. I'd try their 230/650/18 front @ $360. per. I would use their 01 compound which is part # N2076. For rears I'd use their 280/650 @ $412. per. I would use their 02 compound which is part # N2390. Total cost of $1,544. + taxes, etc.
Note: The Yoko 230 front is the same size as Hoosier's 250 front. 9.72 section width vs 9.8, and tread widths of 9.06 vs 9.1. You can see that on the charts I posted previously...
For Hoosiers, I'd use their 250/650 front # 43825 in their R80 compound @ $ 409. per
For rears I'd try their 285/645 # 43855 also in their R80 compound @ $ 460. per. Total cost of $ 1,642.
Club Sports are great shocks, I use them too. What spring rates are you running with them?.....
He has those sizes in stock and I paid 100.00 per tire. They had plenty of rubber to practice on.
Maybe JR can chime in on this but I beleive the Hoosiers and the Yokes like different amounts of camber so I would hate to see you spend money on new tires only to have them corded or wear badly. I tried the both brands at Sebring and ended up cording the Hoosier where the Yokes wore very evenly.
#17
Rennlist Member
Thread Starter
JR:
At your suggestion, I contacted Woodman. They suggested the 235/645 and 285/645 set-up with R80 in front and R100 rear. If you think the 8s can handle the 250s, I'm willing to give that a try.
To answer your other questions, spring rates are 1,000 and we're running 3.2 front and 2.7 rear camber.
Scott:
Thanks for the info on a scrubbed tire source. By the way, your car is too fast...please go back to "I"!!
At your suggestion, I contacted Woodman. They suggested the 235/645 and 285/645 set-up with R80 in front and R100 rear. If you think the 8s can handle the 250s, I'm willing to give that a try.
To answer your other questions, spring rates are 1,000 and we're running 3.2 front and 2.7 rear camber.
Scott:
Thanks for the info on a scrubbed tire source. By the way, your car is too fast...please go back to "I"!!
#18
Rennlist Member
I think I've talked my other 2 996 "I" buddies into following me into GTB.
#19
Burning Brakes
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Is that where all the I guys went? A couple of years ago I thought I choose wrong in going with an H car, as the I fields were growing.
According to Rennpoints there were only 12 I drovers last year (excluding 13's)
According to Rennpoints there were only 12 I drovers last year (excluding 13's)
#20
Rennlist Member
Thread Starter
Yeah, I was at Sebring. Last year was my first year with the car and first year racing, too. I did WGI, NJMP and Summit Point last year. I was car #45 at Sebring. I'm an RTR member.
I will get an avatar posted soon.
I think John Giannone is making the switch from I to GTB1, as well.
I will get an avatar posted soon.
I think John Giannone is making the switch from I to GTB1, as well.
#21
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JR:
At your suggestion, I contacted Woodman. They suggested the 235/645 and 285/645 set-up with R80 in front and R100 rear. If you think the 8s can handle the 250s, I'm willing to give that a try.
To answer your other questions, spring rates are 1,000 and we're running 3.2 front and 2.7 rear camber.
At your suggestion, I contacted Woodman. They suggested the 235/645 and 285/645 set-up with R80 in front and R100 rear. If you think the 8s can handle the 250s, I'm willing to give that a try.
To answer your other questions, spring rates are 1,000 and we're running 3.2 front and 2.7 rear camber.
The slick's is almost an inch taller, but should fit with -3.2 camber up front. I would roll your fenders regardless. I finally threw away the R100's I tested with 20 HC's. There was still lots of rubber left, but they were bricks. I think they're just too hard unless you're a cup....
Are you really running 1,000 lb. springs both front and rear? I run 550/700....
#24
Rennlist Member
A word of caution on the Hoosier 280/645 tire on the rear of mid and rear engine cars. We've been experiencing an alarming number of blow outs related to sidewall/tread separation, so frequent that I have dumped using the Hoosier slick altogether.
Last year I worked very closely with the Hoosier rep on the problem, spending 4 weekends together at the track and monitoring pressures, temps, etc. on my Ferrari 355C. His recommendation was to run the taller sidewall, which I tried and hated in that car. The other work around was to increase tire pressures fairly significantly. Bottom line, he felt that the short sidewall was not suitable for mid and rear engine cars at what I consider to be the ideal air pressures required for the best lap times. Hoosier was the spec tire for the series in 2012 and the drivers were so unhappy that the entire series is moving on to Pirelli for 2013. Unfortunate because I really like Hoosier's customer service and support, I would choose them if I could. I just don't feel like the product works right now.
This is a relatively new phenomenon. I ran the tire successfully in 2010 and won the NASA regional championship on them. But something changed and my experiences the last two years have been horrible. As have others I've been running with. It's not fun when a tire explosion takes out your rear suspension at 90+ mph.
Last year I worked very closely with the Hoosier rep on the problem, spending 4 weekends together at the track and monitoring pressures, temps, etc. on my Ferrari 355C. His recommendation was to run the taller sidewall, which I tried and hated in that car. The other work around was to increase tire pressures fairly significantly. Bottom line, he felt that the short sidewall was not suitable for mid and rear engine cars at what I consider to be the ideal air pressures required for the best lap times. Hoosier was the spec tire for the series in 2012 and the drivers were so unhappy that the entire series is moving on to Pirelli for 2013. Unfortunate because I really like Hoosier's customer service and support, I would choose them if I could. I just don't feel like the product works right now.
This is a relatively new phenomenon. I ran the tire successfully in 2010 and won the NASA regional championship on them. But something changed and my experiences the last two years have been horrible. As have others I've been running with. It's not fun when a tire explosion takes out your rear suspension at 90+ mph.
#26
Rennlist Member
My stock air cooled 3.6 just dyno'ed at 257 rwhp. You've got a nice build there.
#27
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I'll only run one NASA event this year - the June "Nats" at Hallett, so we'll wait to see who shows up (!).
#28
Rennlist Member
With GTS4, I can come off track at 2628# - with 40# of lead and fuel, plus the coolbox I can do that. PCA GT4S comes in at 2677#, so more lead and fuel - it's far more fun to run light and GT3 - but supprisingly not that much faster. I think a GT3R configuraton would be fun.
I'll only run one NASA event this year - the June "Nats" at Hallett, so we'll wait to see who shows up (!).
I'll only run one NASA event this year - the June "Nats" at Hallett, so we'll wait to see who shows up (!).
I am hoping to be at the NASA event at Hallett in June but I will be in my GTS3 car if I do make it.
#29
Rennlist Member
Yeah, I was at Sebring. Last year was my first year with the car and first year racing, too. I did WGI, NJMP and Summit Point last year. I was car #45 at Sebring. I'm an RTR member.
I will get an avatar posted soon.
I think John Giannone is making the switch from I to GTB1, as well.
I will get an avatar posted soon.
I think John Giannone is making the switch from I to GTB1, as well.
Yeah I have been talking to John about weight savings. He is definitely making the transition.
FYI If you were running r6's at Sebring I would say that slicks are about a 2 second savings there.
So R-compound instead of slicks with NASA, makes sense. I think the penalty for slicks is steep in NASA and if you can, a lighter set-up on A6 rubber is a better combination. Matus has proved that over the past few years.
I am hoping to be at the NASA event at Hallett in June but I will be in my GTS3 car if I do make it.
I am hoping to be at the NASA event at Hallett in June but I will be in my GTS3 car if I do make it.
#30
Rennlist Member
Thread Starter
Yes, I was running R6s, had some transmission and brake issues, plus first time on Sebring....Yeah, that's about all the excuses I can come up with for now! Best lap was a 2:25 and change, but my crew guys were wandering up and down the grid looking at the other GTB1 cars and telling me on the radio, "Slicks, slicks, slicks, slicks, etc."