LuckyKid Posted January 5, 2019 Report Share Posted January 5, 2019 I just heard Miata hardtops are zero points. Is this true? Is it only factory tops, or any roof? I very much want to ditch the wood top we have now. Quote Link to comment Share on other sites More sharing options...
hotchkis23 Posted January 5, 2019 Report Share Posted January 5, 2019 I believe this is still in the rule book, specifically addressing this. You can put a top on the car, as long as it matches the factory dimensions it can be handmade at no points. We built ours instead of spending $$$ on a factory hard top. Now, if you go fastback or something with aero components, then you get to take points. 1 Quote Link to comment Share on other sites More sharing options...
JDChristianson Posted January 5, 2019 Report Share Posted January 5, 2019 1 hour ago, hotchkis23 said: I believe this is still in the rule book, specifically addressing this. You can put a top on the car, as long as it matches the factory dimensions it can be handmade at no points. We built ours instead of spending $$$ on a factory hard top. Now, if you go fastback or something with aero components, then you get to take points. Ha, you left out that we built ours because our cage doesn’t fit in a factory top either. 3 Quote Link to comment Share on other sites More sharing options...
LuckyKid Posted January 5, 2019 Author Report Share Posted January 5, 2019 I must have missed this. We were claiming points for our entire wood top. Thanks for the clarification. Quote Link to comment Share on other sites More sharing options...
hotchkis23 Posted January 5, 2019 Report Share Posted January 5, 2019 12 minutes ago, LuckyKid said: I must have missed this. We were claiming points for our entire wood top. Thanks for the clarification. you just have to claim the wood that goes past the main hoop, since you didn't bring it down to the stock location. Quote Link to comment Share on other sites More sharing options...
jakks Posted January 5, 2019 Report Share Posted January 5, 2019 22 minutes ago, LuckyKid said: I must have missed this. We were claiming points for our entire wood top. Thanks for the clarification. You need to claim that contraption.... 1 Quote Link to comment Share on other sites More sharing options...
LuckyKid Posted January 5, 2019 Author Report Share Posted January 5, 2019 We are buying a proper fiberglass one now and we'll claim points on a duck bill in the back. Quote Link to comment Share on other sites More sharing options...
wvumtnbkr Posted January 5, 2019 Report Share Posted January 5, 2019 37 minutes ago, LuckyKid said: We are buying a proper fiberglass one now and we'll claim points on a duck bill in the back. I would definitely ask tech first Get a clarification... Quote Link to comment Share on other sites More sharing options...
Members National Tech Posted January 15, 2019 Members Report Share Posted January 15, 2019 Yes ask tech - or just post some pictures here Quote Link to comment Share on other sites More sharing options...
Gabenheimer Posted January 30, 2019 Report Share Posted January 30, 2019 We will be in our first Champ race in February and have yet to go through tech inspection. Our miata has an aftermarket fiberglass top with a plexiglass rear window. It appears to be more or less the same dimensions as a factory hardtop. Do I have to claim points for this? If so, how many? Thanks Quote Link to comment Share on other sites More sharing options...
Technical Advisory Committee Chris Huggins Posted January 30, 2019 Technical Advisory Committee Report Share Posted January 30, 2019 uh, wow. that hard top is fine That roll cage, i have follow up questions 2 Quote Link to comment Share on other sites More sharing options...
DEE DEE Posted January 30, 2019 Report Share Posted January 30, 2019 Lexan for the rear glass. Quote Link to comment Share on other sites More sharing options...
mhr650 Posted January 30, 2019 Report Share Posted January 30, 2019 46 minutes ago, DEE DEE said: Lexan for the rear glass. Huh??? Quote Link to comment Share on other sites More sharing options...
MoparBoyy Posted January 30, 2019 Report Share Posted January 30, 2019 9 hours ago, Gabenheimer said: where do the roof bars go into the main hoop? like in the middle? thats a very odd cage. 1 Quote Link to comment Share on other sites More sharing options...
DEE DEE Posted January 30, 2019 Report Share Posted January 30, 2019 1 hour ago, mhr650 said: Huh??? In his post he said he had plexiglass for rear glass. Quote Link to comment Share on other sites More sharing options...
mhr650 Posted January 30, 2019 Report Share Posted January 30, 2019 16 minutes ago, DEE DEE said: In his post he said he had plexiglass for rear glass. Oh I see what you were saying, but the prohibition on acrylic (Plexiglas) and the requirement for polycarbonate (Lexan) is only for the front windscreen not side and rear windows. I seriously doubt that that rear window is made from acrylic anyway and much more likely to made from some form of polycarbonate. Lots of people interchange the names without differentiating between them. 1 Quote Link to comment Share on other sites More sharing options...
Team Infiniti Posted January 30, 2019 Report Share Posted January 30, 2019 In tech line, how can the difference be discerned? Serious question Quote Link to comment Share on other sites More sharing options...
mhr650 Posted January 30, 2019 Report Share Posted January 30, 2019 (edited) Good point, it would basically be impossible without destructive testing. Edited January 30, 2019 by mhr650 Quote Link to comment Share on other sites More sharing options...
LuckyKid Posted January 30, 2019 Author Report Share Posted January 30, 2019 1 minute ago, mhr650 said: Good point, it would basically be impossible. Acrylic is harder. A rockwell test would be sufficient: Acrylic / Plexiglas Extruded Impact Strength 0.4 ft lbs / inHardness Rockwell M: 93Polycarbonate / LexanImpact Strength 12 ft lbs / inHardness Rockwell R: 118 Quote Link to comment Share on other sites More sharing options...
ross2004 Posted January 30, 2019 Report Share Posted January 30, 2019 Drats, now tech has to decide on what to buy first, a compression or Rockwell hardness tester. Quote Link to comment Share on other sites More sharing options...
Wink Posted January 30, 2019 Report Share Posted January 30, 2019 I need to know more about this cage situation... Quote Link to comment Share on other sites More sharing options...
wvumtnbkr Posted January 30, 2019 Report Share Posted January 30, 2019 I don't think plexiglass would bend around the corners there without cracking.... Quote Link to comment Share on other sites More sharing options...
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