snakebit Posted February 28, 2008 Share Posted February 28, 2008 Considering turning my 04 GT into a CMC car instead of AI, due to cost. I have some 17 x 9's for the car and was wondering if it's possible that a rule change was possible in 09. I really don't see where it would be an advantage, if anything, more mass and unsprung weight. It's just that I already have these wheels. John Quote Link to comment Share on other sites More sharing options...
bsim Posted February 28, 2008 Share Posted February 28, 2008 CMC2 = OK CMC = Not OK Don't see it changing. Quote Link to comment Share on other sites More sharing options...
King Matt1548534716 Posted February 28, 2008 Share Posted February 28, 2008 Whether it changes in the future or not, you can run that car in CMC-2 right now with 17s, and run better brakes as well. Quote Link to comment Share on other sites More sharing options...
Keith Posted February 28, 2008 Share Posted February 28, 2008 John, I see your logic here - if the tires are limited to 255 then there isn't much of a technical reason to NOT permit them in either class. I agree. I have assumed that both tires sizes will be acceptable some day down the road. Just not today. Quote Link to comment Share on other sites More sharing options...
GT4Point6 Posted February 28, 2008 Share Posted February 28, 2008 Whether it changes in the future or not, you can run that car in CMC-2 right now with 17s, and run better brakes as well. That is a good option but the SOHC comes in 10-20HP at best under the lowest HP on the chart with no legal way to make up the difference and much heavier than the min 3150 for <260hp so your basically underpowered and over weight. Some are going to go this route but I'm not. I did at the NATS to keep it alive and I was over by 200+#, that's a big disadvantage. You could go with a cobra (aluminum) block to shave off 80# or so and that would help but will cost a bit. YMMV Quote Link to comment Share on other sites More sharing options...
Tony G Posted February 28, 2008 Share Posted February 28, 2008 Time to step in here. The 04 you have is just like my car,it will be at 250-255HP and the target @3150 lbs is 260,so that is just perfect for CMC2. So stick with your 17's. 2009 may or may not include both sizes for CMC and CMC2, but I can tell you this..we just had our 1st weekend of extensive testing to see if there was any difference there, but we need at least a few more tests from this point on so no announcment is available right now. Did you know Toyo 17's are cheaper than 16's?? Tony Guaglione I will most likely have a really good update on this by the end of May. Quote Link to comment Share on other sites More sharing options...
snakebit Posted February 29, 2008 Author Share Posted February 29, 2008 Gentleman, Thanks for all of your responses. I was hoping to build for CMC and not CMC2. NASA SE only has a handful of CMC cars (5 registered for Road Atlanta in 2 weeks) and no CMC2 that I've seen. Hey, I guess I could win every weekend in CMC2! I guess I'll get the car dynoed asap and see where I stand. Thanks again, John Quote Link to comment Share on other sites More sharing options...
Tony G Posted February 29, 2008 Share Posted February 29, 2008 You could run a restrictor like I did to get down to the 230HP and go into CMC. Ask your regional coordinator if you can run the 17's in regular CMC,since the car count is not huge you could bring that up with whoever your running with. Its a thought Tony Guaglione . Quote Link to comment Share on other sites More sharing options...
bsim Posted February 29, 2008 Share Posted February 29, 2008 OR you can always just get 16" wheels. There's plenty of CMC2rs that will buy the 17"s off you, or trade for the 16"rs. Quote Link to comment Share on other sites More sharing options...
snakebit Posted February 29, 2008 Author Share Posted February 29, 2008 Brad you're right, i could buy 16"s and I guess I will. Also, putting a restrictor plate on makes alot of sense if I'm over HP. I see that you live in Thousand Oaks. That's a beautiful part of the world. I"ve been there a few times. Back around 1990-1991 I had the priviledge of photographing the clubhouse, 4 model homes, and the swim/tennis facility at Sherwood CC. Quote Link to comment Share on other sites More sharing options...
cozog1548534733 Posted June 28, 2008 Share Posted June 28, 2008 2009 may or may not include both sizes for CMC and CMC2, but I can tell you this..we just had our 1st weekend of extensive testing to see if there was any difference there, but we need at least a few more tests from this point on so no announcment is available right now.Did you know Toyo 17's are cheaper than 16's?? Tony Guaglione I will most likely have a really good update on this by the end of May. I'm just checking on this issue before I buy a bunch of 16" wheels. Are 17" wheels even a consideration for 2009 ,and beyond, in CMC1? Quote Link to comment Share on other sites More sharing options...
Glenn Posted December 11, 2008 Share Posted December 11, 2008 (edited) attempting to change the subject. ooops! bad selection. should be some good reading though. -edited cause i was surfing and driving. Edited December 12, 2008 by Guest Quote Link to comment Share on other sites More sharing options...
Renntag1548534718 Posted December 12, 2008 Share Posted December 12, 2008 What ? Quote Link to comment Share on other sites More sharing options...
Varkwso1548534736 Posted December 14, 2008 Share Posted December 14, 2008 Gentleman, Thanks for all of your responses. I was hoping to build for CMC and not CMC2. NASA SE only has a handful of CMC cars (5 registered for Road Atlanta in 2 weeks) and no CMC2 that I've seen. Hey, I guess I could win every weekend in CMC2! I guess I'll get the car dynoed asap and see where I stand. Thanks again, John We will be entering a 88 Mustang into CMC in the 2009 season in NASA-SE. I do wish I could run the cheaper 17" tires. Quote Link to comment Share on other sites More sharing options...
Rustang72 Posted December 15, 2008 Share Posted December 15, 2008 Talk to your regional director about running 17" wheels in CMC in your SE. Quote Link to comment Share on other sites More sharing options...
TurboShortBus Posted December 15, 2008 Share Posted December 15, 2008 Would a 255/40-17 really make much of a difference over the CMC-spec 255/50-16? Granted, the 16" tire has a larger diameter, but the widths are the same (255mm size code and inflated overall width 10.4" wide per Toyo's site) in the RA1s. Note that the R888s have a width difference (tread width 10.0" for 16" vs 10.4" for 17"). For example, in Time Trial, tire size points are based only on the width of the tire, while the wheel diameter is not a factor. Mark Quote Link to comment Share on other sites More sharing options...
Varkwso1548534736 Posted July 4, 2009 Share Posted July 4, 2009 Having bought 6 R888s in 16 inch sizes already - I am going to push the 17 inch option here in the SE for CMC. Tire cost is the issue. The chance of any performance advantage is very, very small. Quote Link to comment Share on other sites More sharing options...
Trevor571548534737 Posted August 10, 2009 Share Posted August 10, 2009 Is there any new info on this subject? This is one of a handful of rules stopping me from taking the plunge into CMC. What is the intent of this rule? If 17's are being allowed regionally, and are proven to be of no advantage why are 17's still not allowed? Quote Link to comment Share on other sites More sharing options...
Glenn Posted August 10, 2009 Share Posted August 10, 2009 Is there any new info on this subject? This is one of a handful of rules stopping me from taking the plunge into CMC. What is the intent of this rule? If 17's are being allowed regionally, and are proven to be of no advantage why are 17's still not allowed? they are legal in CMC-2, so whay not go there? all CMC cars will one day end up in CMC-2. Quote Link to comment Share on other sites More sharing options...
Sidney Posted August 10, 2009 Share Posted August 10, 2009 Trevor, We've already talked about the 17's amoungst the current Midwest CMC drivers and have agreed that 17's are fine for now. Once National (and not Glenn) desides if there is only going to be one class or not, then as a region, we will determine the future use of 17's in CMC. (Be aware...should you race outside of the Midwest/Great Lakes regions you will need to run CMC2 due to your 17's.) Right now...2010 will have all the current CMC drivers back in CMC. Sidney CMC #64 Quote Link to comment Share on other sites More sharing options...
Glenn Posted August 10, 2009 Share Posted August 10, 2009 Trevor, We've already talked about the 17's amoungst the current Midwest CMC drivers and have agreed that 17's are fine for now. Once National (and not Glenn) desides if there is only going to be one class or not, then as a region, we will determine the future use of 17's in CMC. (Be aware...should you race outside of the Midwest/Great Lakes regions you will need to run CMC2 due to your 17's.) Right now...2010 will have all the current CMC drivers back in CMC. Sidney CMC #64 this is well w/in the rights of any region to decide. like he said, its not to be expected in all regoins or at Nationals. if your comptitors have no issue w/ it, have at it. Quote Link to comment Share on other sites More sharing options...
Varkwso1548534736 Posted August 16, 2009 Share Posted August 16, 2009 Is there any new info on this subject? This is one of a handful of rules stopping me from taking the plunge into CMC. What is the intent of this rule? If 17's are being allowed regionally, and are proven to be of no advantage why are 17's still not allowed? they are legal in CMC-2, so whay not go there? all CMC cars will one day end up in CMC-2. because a CMC car is not competitive in CMC2 - without more money spent. 2010 will still have CMC Quote Link to comment Share on other sites More sharing options...
Glenn Posted August 16, 2009 Share Posted August 16, 2009 Is there any new info on this subject? This is one of a handful of rules stopping me from taking the plunge into CMC. What is the intent of this rule? If 17's are being allowed regionally, and are proven to be of no advantage why are 17's still not allowed? they are legal in CMC-2, so whay not go there? all CMC cars will one day end up in CMC-2. because a CMC car is not competitive in CMC2 - without more money spent. 2010 will still have CMC and that is wrong. i run faster lap times than all but 1 of our CMC-2 cars. and that car is only up on power over me, all other factors are the same. the lap time difference can be verified by looking at our info on mylaps.com. we are in Group4. i am CMC - Glenn Landrum, and he is James Proctor in CMC-2. in the past when we were both CMC, it was a toss up between us. he now gets me bu a couple tenths. besides, what are the costs your looking at for CMC-2 power? Quote Link to comment Share on other sites More sharing options...
TurboShortBus Posted August 16, 2009 Share Posted August 16, 2009 besides, what are the costs your looking at for CMC-2 power? Jeff may be looking at this from the "swap heads/intake/cam on a 225 hp stock Mustang" point of view, instead of the "just add a restrictor plate to a later model F-body" point of view. But, from what I have seen, I wouldn't just assume that a car making CMC power would not be competitive in CMC2, since other important things like driving skill, car preparation, and simple reliability can vary greatly and can often make up the power difference. We have a fairly high-powered AI car down here that can't keep up with lower-powered AI entries, largely due to that thing behind the wheel and not necessarily the difference in weight (a different driver in the high-powered car proved that significantly quicker lap times are possible). Hell, most of the AI cars down here outrun the odd AIX car that occasionally shows up. Mark Quote Link to comment Share on other sites More sharing options...
Varkwso1548534736 Posted August 16, 2009 Share Posted August 16, 2009 It is a new motor and accessories for the 88 Mustang. It is down on power for a CMC car. Quote Link to comment Share on other sites More sharing options...
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