NASA penalizes all rear engines.......
12-19-2013, 01:24 AM
#76
Burning Brakes
JRichard, I thought the Conti slicks that were provided to the Porsche cars were not allowed to eliminate the .7 penalty.
Has anyone run those? I can save the Pirellis for PDC
Has anyone run those? I can save the Pirellis for PDC
12-19-2013, 01:39 AM
#77
Rennlist Member
Dave:
GACTSCC Tires:
Grand Am Continental Tire Sports Car Challenge tires are exempt from the -0.7 Modification Factor for Non-DOT approved tires when calculating the “Adjusted Wt/Hp Ratio” (Does not include “Rolex series” tires). They will use the tire size Modification Factors for DOT approved tires.
GACTSCC Tires:
Grand Am Continental Tire Sports Car Challenge tires are exempt from the -0.7 Modification Factor for Non-DOT approved tires when calculating the “Adjusted Wt/Hp Ratio” (Does not include “Rolex series” tires). They will use the tire size Modification Factors for DOT approved tires.
12-19-2013, 01:48 AM
#78
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Dave:
GACTSCC Tires:
Grand Am Continental Tire Sports Car Challenge tires are exempt from the -0.7 Modification Factor for Non-DOT approved tires when calculating the “Adjusted Wt/Hp Ratio” (Does not include “Rolex series” tires). They will use the tire size Modification Factors for DOT approved tires.
GACTSCC Tires:
Grand Am Continental Tire Sports Car Challenge tires are exempt from the -0.7 Modification Factor for Non-DOT approved tires when calculating the “Adjusted Wt/Hp Ratio” (Does not include “Rolex series” tires). They will use the tire size Modification Factors for DOT approved tires.
12-19-2013, 02:19 AM
#81
Burning Brakes
So guys, check my math:
2935 car, throttle restrictor to 350 = 8.39 minus .2 (porsche penalty) minus .1 (weight) = 8.09 if I run Hoosiers and keep every body/aero stock
or
3000 lb car, throttle restrictor to 337 = 8.9 minus .2 (porsche penalty) minus .7 (slicks) = 8.0
which way would you go????
I should add a lot of tight short tracks, Chuckwalla would probably be the longest track, 30 min sprint races
Chris Striet if your reading this, I would love to get your opinion as well.
2935 car, throttle restrictor to 350 = 8.39 minus .2 (porsche penalty) minus .1 (weight) = 8.09 if I run Hoosiers and keep every body/aero stock
or
3000 lb car, throttle restrictor to 337 = 8.9 minus .2 (porsche penalty) minus .7 (slicks) = 8.0
which way would you go????
I should add a lot of tight short tracks, Chuckwalla would probably be the longest track, 30 min sprint races
Chris Striet if your reading this, I would love to get your opinion as well.
12-19-2013, 05:58 AM
#82
Race Car
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JR, as light as your car is you should try A6. The new A7 will come out soon too. Don't believe the hype that they are autocross tires. Guys have been dominating on the road course with them for almost a decade. The Vettes that have faster times are almost certainly on them. Give them a try. You have contingency you can win too. As long as you don't overdrive them, they are good to the cords for fast times. Immediately up to temp for quick starts at the race. And you save point.
12-19-2013, 10:03 AM
#83
Three Wheelin'
I race my 2750 pound ST2 car on A6's and they hold up well if your car is well set up and you don't over-drive them. They are also a must to qualify well in the Great Lakes Region. I like the Goodrich R1S as well, it is more consistent over race distance. I will be doing a back to back test at the beginning of the season.
I ran 2012 on the BFG R1 at Mid O Pro course in the low :31's. To be competitive in ST2 or TT2 should be low :30's with the 8:1 ratio.
I ran 2012 on the BFG R1 at Mid O Pro course in the low :31's. To be competitive in ST2 or TT2 should be low :30's with the 8:1 ratio.
12-19-2013, 10:52 AM
#84
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JR, as light as your car is you should try A6. The new A7 will come out soon too. Don't believe the hype that they are autocross tires. Guys have been dominating on the road course with them for almost a decade. The Vettes that have faster times are almost certainly on them. Give them a try. You have contingency you can win too. As long as you don't overdrive them, they are good to the cords for fast times. Immediately up to temp for quick starts at the race. And you save point.
FWIW, I'm very, very happy with the new compounds Yokohama recently released. They're much improved in both their Patron Cup tires and their Clubsport line. I turned a 1:25:7 in the last lap of Sunday's race at WSIR 2 weeks ago. That was their 4th HC on the 15th lap and I was smiling thru T8 at all the grip I had. I'd never broken 26 there in a race before though I've turned high 24's in qual on stickers....
12-19-2013, 10:58 AM
#85
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I'd considered running them for NASA races only if I needed to but with my whp (approx. 295) and impound weight (2625) I'm right at 8.9 so why not run slicks? I can't lose any more weight but if I magically found another 15 whp I'd give them a shot. I did run their slicks once using 265's and 305's. I believe their corresponding A/R series is 255's and 315's.
FWIW, I'm very, very happy with the new compounds Yokohama recently released. They're much improved in both their Patron Cup tires and their Clubsport line. I turned a 1:25:7 in the last lap of Sunday's race at WSIR 2 weeks ago. That was their 4th HC on the 15th lap and I was smiling thru T8 at all the grip I had. I'd never broken 26 there in a race before though I've turned high 24's in qual on stickers....
FWIW, I'm very, very happy with the new compounds Yokohama recently released. They're much improved in both their Patron Cup tires and their Clubsport line. I turned a 1:25:7 in the last lap of Sunday's race at WSIR 2 weeks ago. That was their 4th HC on the 15th lap and I was smiling thru T8 at all the grip I had. I'd never broken 26 there in a race before though I've turned high 24's in qual on stickers....
12-19-2013, 11:04 AM
#86
Rennlist Member
Jrichard, I didn't even email Greg because i knew I couldn't control my temper.
I am still trying to figure out if I can get the 996 cup into ST2, that will make a couple of guys happy.
I think I saw that the Pfat vette at Nationals, in ST2 beat the time of the GTS5 2010 3.8 997 cup with paddle shift, which would not get into ST1 now.
I am still trying to figure out if I can get the 996 cup into ST2, that will make a couple of guys happy.
I think I saw that the Pfat vette at Nationals, in ST2 beat the time of the GTS5 2010 3.8 997 cup with paddle shift, which would not get into ST1 now.
I had a pile of weight bolted in for the Nationals and didn't like the way the car felt, it was a relief to take it all out for the following PCA race weekend
12-19-2013, 11:28 AM
#87
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Wow really? I used to love me some Yokos. How quick are they up to temp relative to Hoosier or Pirelli slicks? Is there a new compound name? You think they are faster than the Pirelli DH? I think I'm moving to slicks this year but the stiffer sidewalls always give me trouble and for TT, slicks aren't up to temp fast enough if I only have 1-2 hot laps.
http://www.tracksideperformance.com/...13-product.pdf
12-19-2013, 12:15 PM
#89
I think my incessant whining paid off. NASA is now only penalizing really light modern 911's.
The new rule only applies an additional .1 mod factor to 99 and up 911's 2700-2900 lbs race weight and a .2 if you are lower than 2700 lbs.
Us heavyweights and the classics are on the normal rules. Audi, you should go and win some events.
Park, you talking about Kyle Schick? You guys coming to Road Atlanta?
I would say it depends on how many HC on the Pirelli slicks. Sticker A6 are nasty. After about 3 HC on slicks my money is on the A6.
The new rule only applies an additional .1 mod factor to 99 and up 911's 2700-2900 lbs race weight and a .2 if you are lower than 2700 lbs.
Us heavyweights and the classics are on the normal rules. Audi, you should go and win some events.
Park, you talking about Kyle Schick? You guys coming to Road Atlanta?
I would say it depends on how many HC on the Pirelli slicks. Sticker A6 are nasty. After about 3 HC on slicks my money is on the A6.
Hey I'm just going to be chasing both of you
Their worksheet calculates for the class multiplier then tells you what class you're in. That's silly. I prefer to calculate my minimum weight for my chosen class (ST2) so I add the penalties to the class minimum and then multiply that against my dyno results. Much easier and allows me to adjust weight or WHP if needed.
Yea I was just reading Greg's explanation over at NASA and realized I was double penalizing myself for the rear engine thingy. As I said I don't care it's trivial and won't really affect me. It just pisses me off the Corvettes win 3 of the 5 ST titles and they penalize Porsches. Thanks for the motivation Greg....
Yea I was just reading Greg's explanation over at NASA and realized I was double penalizing myself for the rear engine thingy. As I said I don't care it's trivial and won't really affect me. It just pisses me off the Corvettes win 3 of the 5 ST titles and they penalize Porsches. Thanks for the motivation Greg....
