JSG1901 Posted October 14, 2013 Share Posted October 14, 2013 Type Modification to an existing rule Existing rule section (if applicable) Non-DOT Tire Proposed change Make Non-DOT tire a flat .5 modification adjustment. Currently adjustment factor varies widely from class to class. Reason Standardize "spread" for Non-DOT tire. More aligned with Super Touring rules for easier crossover. Proposed new wording None provided. Quote Link to comment Share on other sites More sharing options...
KTL Posted October 14, 2013 Share Posted October 14, 2013 No Seems like messing with an already well-functioning formula. The existing formula was clearly developed with some understanding that as the wt/pwr ratio declines, the benefit of the non-DOT tires is not as prevalent? Quote Link to comment Share on other sites More sharing options...
Luke P. Posted October 14, 2013 Share Posted October 14, 2013 Against Quote Link to comment Share on other sites More sharing options...
UKRBMW Posted October 15, 2013 Share Posted October 15, 2013 Also against Quote Link to comment Share on other sites More sharing options...
mikew968 Posted October 15, 2013 Share Posted October 15, 2013 The current system does not work for most of the classes. 1, 2, and 3 get too mcuh of a penalty to run slicks. I would be for this rule as it seems more balanced. Quote Link to comment Share on other sites More sharing options...
911.racer Posted October 15, 2013 Share Posted October 15, 2013 I agree with Mike. There is too much of a spread in the lower classes. No one is actually running slicks (that I know of). These days the DOT's are very close to the performance of the slicks. This was not the case 5 years ago. I run slicks in GTS4 now mostly becuase the sizes are better, but in GTS1 I would never have considered it. Thanks Ed Quote Link to comment Share on other sites More sharing options...
hamflex Posted October 15, 2013 Share Posted October 15, 2013 Aginst Quote Link to comment Share on other sites More sharing options...
jvanhouten Posted October 15, 2013 Share Posted October 15, 2013 Against, but I agree that maybe the GTS/1 and 2 (maybe 3) assessments need to be re-evaluated. Quote Link to comment Share on other sites More sharing options...
JSG1901 Posted October 15, 2013 Author Share Posted October 15, 2013 For the record, the current difference between DOT and non-DOT tires in each of the classes require the following amount of additional weight for non-DOT tires GTS1: 8.11% GTS2: 10.34% GTS3: 9.09% GTS4: 5.88% GTS5: 9.09% So, other than GTS4 which has half the handicap of the others, the ratio is pretty close to the same for each class as it is today. Quote Link to comment Share on other sites More sharing options...
ILIKETODRIVE Posted October 15, 2013 Share Posted October 15, 2013 For the record, the current difference between DOT and non-DOT tires in each of the classes require the following amount of additional weight for non-DOT tires GTS1: 8.11% GTS2: 10.34% GTS3: 9.09% GTS4: 5.88% GTS5: 9.09% So, other than GTS4 which has half the handicap of the others, the ratio is pretty close to the same for each class as it is today. Reading the rule proposal and seeing the spread in numbers, it makes sense. Drop the high (GTS2) and low (GTS4) and average the other 3 (8.76%) across all classes. Quote Link to comment Share on other sites More sharing options...
Brad Waite Posted October 15, 2013 Share Posted October 15, 2013 I vote no. Quote Link to comment Share on other sites More sharing options...
cstreit911 Posted October 18, 2013 Share Posted October 18, 2013 As soon as you muck with the power to weight ratios you introduce potentially very expensive changes to the classes you impact for all drivers involved. Taking GTS4 because I know it well. If you change it to 1.0 and make these cars run 9.5:1 for slicks... That's an average of 160-170# of ballast that now must be added to the cars running slicks requiring major changes to suspension alignments, spring rates, etc... which get very expensive. By that same token now the GTS2 cars running slicks all go back for engine mods to get more horsepower. What will happen is that all the GTS4 cars will switch to DOT's because the penalty is now too big (You see there isn't a huge disparity in the slick vs. DOT cars in GTS4) and have to change their tunes, suspension, tire setup, etc... And the GTS2 DOT guys will all freak out because the guys moving to slicks now have a huge advantage. There is no problem with the ratios as they stand now. No class has a huge disparity in times with the slicks vs. DOT. So why change it? Quote Link to comment Share on other sites More sharing options...
doclouns Posted October 18, 2013 Share Posted October 18, 2013 Seems silly as is, make it consistant. Quote Link to comment Share on other sites More sharing options...
philstireservice Posted October 18, 2013 Share Posted October 18, 2013 Just to add more info - slicks (not GA Tires) are 2 seconds faster per lap than a DOT on average. They do cost more and do have a shorter fast life. Quote Link to comment Share on other sites More sharing options...
cstreit911 Posted October 18, 2013 Share Posted October 18, 2013 That also depends on the car. It was two seconds on my lightweignt car. Less than a second on the heavier version. Quote Link to comment Share on other sites More sharing options...
autodoctor911 Posted October 19, 2013 Share Posted October 19, 2013 For the record, the current difference between DOT and non-DOT tires in each of the classes require the following amount of additional weight for non-DOT tires GTS1: 8.11% GTS2: 10.34% GTS3: 9.09% GTS4: 5.88% GTS5: 9.09% So, other than GTS4 which has half the handicap of the others, the ratio is pretty close to the same for each class as it is today. I am a little bit unclear on what the proposed flat rate penalty would do to affect the situation. Right now GTS 1 and 2 have a 1.5, GTS 3 a 1.0, GTS 4 a 0.5 and GTS 5 a 0.6 if it were a flat 0.5, this would be reducing minimum weight for slicks in all classes except GTS4, correct? I assume the current digressive(except for the 0.1 increase from GTS4 to 5) weight penalty is due to the fact that as the cars get more power to weight the slicks have less of an advantage? I would think a more powerful car would benefit more from slicks than a less powerful one, but that is just theory, and this should be figured out by actual results. I take it, that right now it is prohibitive to run non-DOT tires in most of the lower classes, and this change would make it more feasible. Slicks may cost more in general, but some cars may be limited to slicks due to size availability, or other reasons. Also, certain sizes, like 15" slicks can be had for significantly less than a Hoosier A6/R6 in a similar size. I would think that it would be good to keep each class a different ratio, but adjust each one based on what is currently working. If slicks are slower right now, due to an unfair weight penalty in a certain group, change that class's adjusted HPtoWeight. Maybe a increase in the weight of the DOT tire cars would be easier to implement, since it is almost always easier to add weight than remove it or increase HP, if a car doesn't have much ballast. Quote Link to comment Share on other sites More sharing options...
scottbm3 Posted October 23, 2013 Share Posted October 23, 2013 Leave rule as it is currently -Scott B. Quote Link to comment Share on other sites More sharing options...
llis Posted October 23, 2013 Share Posted October 23, 2013 Are there actual metrics that this proposed rule change is based upon? Or is 0.5 an arbitrary number? As written, I'm against. However, unless metrics suggest that life is different in GTS4, I would be in favor of making the factor the same across all classes. Quote Link to comment Share on other sites More sharing options...
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