Ok, taking all of the info above into consideration, as well as other reading I've done. Would the reverse cowl hood, plus a bumper with a larger air dam achieve the affect I'm looking for?

 

or am I just trying to hard at this point?

 

Are you roadracing or autocrossing?

 

autocrossing, and maybe drag racing

 

if your drag racing you dont want a bunch of aerodynamic parts really.... adding a big splitter or air damn of any sort will slow you down. hense why you never see fast cars with them. some have a spoiler in the rear but they dont have the same type of spoiler that road race cars do.

as far as autocrossing they wont matter until you start going fast.

for now just get what you like that looks good. the cooling function of heat extractor hoods words well. especially in the case of the lnf that runs really hot.

 

Ok, cool. Honestly I haven't found any bumpers or lips that I like better than my stock one anyway, most are just big and kind of obscene lol. I have a supercharged lsj but cooling the engine is good regardless right?? Also, I still have the factory high rise wing on the back. At first I didn't like it but it has grown on me because it compliments the car really well. However I still find myself questioning its functionality and if it's really helping anything. I do like to think gm wouldn't engineer something like that if it didn't help the car it was designed for.

 

Yes and yes. I'd imagine a big gaping hole would help with lowering engine bay temps especially on a supercharged car. It may not make a difference during a race but for recovery from heat soak between races.

 

well a big gaping hole will only do so much. thats why reverse cowls work and why little scoops are put in front of holes that are techincally "flat" on the surface.

Imagine air flow over the car..... if you have a flat vent inline with the smooth surface the air will divert down. into the bay with really no where to go unless you have ducting. if you put a degreed lip on the hood in front of it the air diverts over the vent taking the rising hot air with it as it travels over the car. reverse cowls are the same deal. even though it doesnt have a lip the hot air is starting at a lower point and as it rises it will get carried away.

the highrise wing is a huge argument in itself. a lot of people dont realize the wing design works great but the production wing is different from the crawford wing tested. They look the same but the center blade on the production wing has a gap in the middle where at the crawford wing does not. Air comes in front underneath pushes up as soon as it hits the gap and air coming off the roof is pushing down causing the wing to vibrate at 70-80mph. You can physically watch it move in the rear view. that movent = stall.... no true downforce.

 

so by the gap in the middle of the production wing do you mean it is hollow? or are you referring the space between the wing and the trunk lid? and I've tried looking for Crawford wings but I've got a lot of different results and I'm not sure what I'm looking for...

 

Sub'd

 

No. Feel underneath your high rise spoilers center blade... you will feel a nice big gap. There is nothing wrong with the gap between the spoiler itself and the trunk wing. My ideal solution is to run a blade style spoiler(similar to the tjin but more like John Powells redline spoiler), but with a set of roof strakes to guide the air flow. I have not had time to get the parts on or painted.

You wont find the Crawford composites wings anywhere. They were unloading them awhile back and offered me one at the grand spanking deal of 2000 bucks which is over a 1000 off what it was costing race teams. I have one of the koni challenge lips and the only one that is not on a race car. Same with my hood and trunk.... Only ones I know to exist for a cobalt outside of race teams.

 

Damn, I never noticed the gap there before. So, what if I were to fill the gap or cover it somehow? I'm actually a machinist so if I could get my hands on the right material I'm sure my boss would let me fabricate something after hours...

 

you want to keep it light weight... your best bet is to find one of the carbon fiber center blades. im pretty sure those don't have the gap. the Crawford wing is a one piece work of art but you wont find them anymore.

 

So something like this? AIT RacingŽ CC05BMSSRW2 - Chevy Cobalt 2006-2009 SS Style Fiberglass Rear Spoiler with Carbon Fiber Blade

 

yep. just contact them because I cant remember if it has that gap in the bottom or not. Its not the best solution but being as I know the time it takes to machine something nicely this would be worth the price and save you the time and headache.

 

Yeah, because I'd have to make it out of some kind of plastic on a hand operated machine which can be quite painstaking. I'll call them sometime and make sure there's no gap. If there is I'm sure I can find something else. Thanks for all the help man! I'm excited to start on this stuff early next year!

 

Our cars are areo disasters.

The stock wing makes almost no downforce at anything under 100mph. Just tons drag. Supposedly it pulls top speed down like 10mph stock.

 

It's funny you say that is pulls top speed down. I'm sure the lsj only came with the high rise wing and has a higher top speed than the lnf with the low rise

 

Stock for stock is does not matter because even though some aerodynamic testing is done it's no where close to what race teams do when it comes down to it... The wing design is good but the gap is the issue. They had to cut manufactuering costs somewhere it seems. Take a look at any of the Georgia bay cobalts, koni/continental challenge cobalts. Not a single one runs a factory wing. They all run the Crawford wing without the gap.

Next time your on a track or you decide you feel like doing 80 to 100 on the highway watch your wing flex. When it flexes your not making any downforce. The vibrations cause stall.

 

I was actually on the highway the other day and even just maintaining 75 I could watch it jumping around.

 

Yeah I wasent lying lol.... Imagine being at 120+ on the track.

 

Can you easily fill in the gap in the spoiler with bondo or something

 

Defintaely not... That's a hack way of doing it. He would be better off duct taping the gap before doing that or making somethingn out of plastic like he said. Filler is heavy and if you add that much filler it will crack appart sooner than later. Some of the carbon. Blades are gapless and is worth the headache saved