petawawarace Posted February 23, 2021 Report Share Posted February 23, 2021 Since we havnt been able to get to any races in the US, I can’t see what guys are doing. Hoping someone can help me out. Im going to be cleaning the front on the Cobalt up aero wise. I’m going to add a splitter and about a 3” air dam between the bottom of the nose and the splitter. I submitted a ticket asking about covering up the fog light holes, which was answered with a charge for materials. That was before I was sure I would claim an air dam. Is it reasonable to assume I could close off the 2 fog light holes and the upper grill (circled in red) with material of my choice if I claim an air dam? Quote Link to comment Share on other sites More sharing options...
wvumtnbkr Posted February 23, 2021 Report Share Posted February 23, 2021 7 minutes ago, petawawarace said: Since we havnt been able to get to any races in the US, I can’t see what guys are doing. Hoping someone can help me out. Im going to be cleaning the front on the Cobalt up aero wise. I’m going to add a splitter and about a 3” air dam between the bottom of the nose and the splitter. I submitted a ticket asking about covering up the fog light holes, which was answered with a charge for materials. That was before I was sure I would claim an air dam. Is it reasonable to assume I could close off the 2 fog light holes and the upper grill (circled in red) with material of my choice if I claim an air dam? Well, you can / maybe should cut off the entire bumper of the car below the actual bumper and replace with an airdam. Otherwise, you would be carrying extra parts that are not needed. I believe you will NOT be able to cover up the upper grill without points because that is not part of the vertical surface that an airdam is defined as. 2 Quote Link to comment Share on other sites More sharing options...
mender Posted February 23, 2021 Report Share Posted February 23, 2021 What was your headliner made of? Stiff enough to cover the upper grill? If so, repurposed = no points. Quote Link to comment Share on other sites More sharing options...
petawawarace Posted February 23, 2021 Author Report Share Posted February 23, 2021 Yeah I guess I could easily re-purpose something to cover it up but it’ll look like garbage. I believe I could also duct-tape over it for 0 points too right? Quote Link to comment Share on other sites More sharing options...
petawawarace Posted February 23, 2021 Author Report Share Posted February 23, 2021 15 minutes ago, wvumtnbkr said: Well, you can / maybe should cut off the entire bumper of the car below the actual bumper and replace with an airdam. Otherwise, you would be carrying extra parts that are not needed. I believe you will NOT be able to cover up the upper grill without points because that is not part of the vertical surface that an airdam is defined as. The lower section of the bumper is pretty much vertical and perfect as an “air-dam”. I just need to extend it down some more. I see what your saying, like all the Miatas do, but 80% of that is already there on my car. Quote Link to comment Share on other sites More sharing options...
wvumtnbkr Posted February 23, 2021 Report Share Posted February 23, 2021 Yeah, but you don't need to claim points for fog light covers then either. Also, you can make it go "out" slightly which may help with aero. Quote Link to comment Share on other sites More sharing options...
Bandit Posted February 23, 2021 Report Share Posted February 23, 2021 Repurpose materials to cover the fogs? I was going to suggest using them for the brake duct intakes but they are set pretty wide so that might not be workable. Like the fact you are concerned about appearance. Would applaud if the 60% rule went away. 1 Quote Link to comment Share on other sites More sharing options...
mender Posted February 23, 2021 Report Share Posted February 23, 2021 (edited) 3 hours ago, petawawarace said: Yeah I guess I could easily re-purpose something to cover it up but it’ll look like garbage. I believe I could also duct-tape over it for 0 points too right? Yes, or you could cut the ends of the grille slats, nest them against each other in a "closed" position and glue them back in place. 0 points. Edited February 23, 2021 by mender Quote Link to comment Share on other sites More sharing options...
petawawarace Posted February 23, 2021 Author Report Share Posted February 23, 2021 I got a little carried away with the Sawsall tonight. Going to do a full air dam. Also put some 400mph tape over the upper grill. The whole car is getting wrapped so it might look ok. 50/50. Gotta look good at 50mph from 50ft. 2 Quote Link to comment Share on other sites More sharing options...
mender Posted February 23, 2021 Report Share Posted February 23, 2021 Quote Link to comment Share on other sites More sharing options...
petawawarace Posted February 23, 2021 Author Report Share Posted February 23, 2021 (edited) 6 minutes ago, mender said: Any advantage to the “undercut” like that? Higher pressure above the splitter? I could easily do that, but not sure why. Edited February 23, 2021 by petawawarace Quote Link to comment Share on other sites More sharing options...
mender Posted February 23, 2021 Report Share Posted February 23, 2021 (edited) 16 minutes ago, petawawarace said: Any advantage to the “undercut” like that? Higher pressure above the splitter? I could easily do that, but not sure why. I've been trying to find testing either way but haven't yet. That was on NASCAR's Car Of Tomorrow, pretty sure there was a bunch of testing before they decided on that design. The best I could find is this: https://hanchagroup.wordpress.com/2013/01/29/splitter-or-air-dam-which-design-is-best/ My thoughts: higher pressure because of the undercut and more exposed splitter surface for that high pressure to act on, but the high pressure will also be acting on the underside of the overhang, possibly cancelling out some or even all of the extra splitter area. Some more reading for you: https://professionalawesome.com/diy-downforce/#:~:text=Splitter Angle&text=Angles should be in the,of attack for maximum performance. Edited February 23, 2021 by mender Quote Link to comment Share on other sites More sharing options...
petawawarace Posted February 23, 2021 Author Report Share Posted February 23, 2021 (edited) 12 minutes ago, mender said: I've been trying to find testing either way but haven't yet. That was on NASCAR's Car Of Tomorrow, pretty sure there was a bunch of testing before they decided on that design. The best I could find is this: https://hanchagroup.wordpress.com/2013/01/29/splitter-or-air-dam-which-design-is-best/ My thoughts: higher pressure because of the undercut and more exposed splitter surface for that high pressure to act on, but the high pressure will also be acting on the underside of the overhang, possibly cancelling out some or even all of the extra splitter area. Some more reading for you: https://professionalawesome.com/diy-downforce/#:~:text=Splitter Angle&text=Angles should be in the,of attack for maximum performance. Read that second place me a few weeks ago. Thanks tho. With this car, I’m more concerned with making it slippery. The stock setup leaves a lot to be desired. I don’t really need more front downforce. Edited February 23, 2021 by petawawarace Quote Link to comment Share on other sites More sharing options...
mender Posted February 23, 2021 Report Share Posted February 23, 2021 #6 has the lowest drag and the most downforce; apparently you can have both. Quote Link to comment Share on other sites More sharing options...
Gkuhn41 Posted February 24, 2021 Report Share Posted February 24, 2021 Duct Tape the upper air dam. Get crazy and buy blue stuff to look good. Quote Link to comment Share on other sites More sharing options...
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