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The most important thing to take away from this is: New Is ALWAYS Better Sent from my iPhone |
[QUOTE=phelan;1651002]Oh dear, the mythbusters correlation.
Okay, there is a question of scaling here. QUOTE] :p LOL I know but I made the reference only to make a point. Agreed, definitely much less air is directed through the bottom of the car then on the top. |
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:inoutroflpuke: AWESOME ZED!!!! HAHAHAHA
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Just some observations:
1. Kenchan is right, there is not much air going under the car 2. we have front spoilers 3. the differential is almost as low as the rear bumper therefore it will block off some of the air approaching the bumper "parachute like" area 4. If someone really wanted to, plug in an airflow sensor right behind the bumper between two cans and measure how much airflow there really is. |
I'm not sure if this is relavant:
http://www.the370z.com/nissan-370z-g...ml#post1581307 |
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IMO, the impact is negligible at best. There simply isn't enough airflow in that area to worry about. If i could get hold of a cheap air flow meter and find out i would.
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I don't think it's really an issue of drag as much as it is lift, or reduction of lift. Remember the 370z is designed to have zero rear lift. This is probably done with the spoiler and flat (err... flat enough ) bottom. The fact is that none of us likely have the resources Nissan has in order to determine what effect there is from the various styles of aftermarket exhausts. All I know is from most of the articles and papers I've seen regarding race car aero, airflow underneath the car is at least as important as airflow above the car, if not more important. Just look at some of the supercars coming out now that generate hundreds of pounds of downforce without using a wing. Of course they usually have a completely flat bottom along with a bunch of other specific design considerations, but you get the idea.
That said, I think anybody really concerned with the issue would probably also think to buy or build an exhaust that's tucked up as high as possible in order to leave room to build a custom diffuser. Since we don't necessarily have the wind tunnels or computer modeling at our disposal, we really would have to stick to the academic. My gut says that messing with the exhaust in any way risks creating some rear-end lift. If that's a concern then you should plan on adding a rear diffuser. But, I really think the only folks that ought to be concerned with it are those that heavily track their cars and want to do so with no rear wing or one as small as possible. |
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if you look at the Nismo 370z RC you will notice they didn't worry about tucking the muffler. Heck it has other items hanging down into the airflow. If they weren't worried about it then why should i be??
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On the OP's question, I for one wouldn't worry about it at all.
If you want sound and a small amount of power, get an exhaust. If you care a lot about drag, add a diffuser under the body. You could also remove the spoiler, but I wouldn't. If you care about lift/downforce, get a (bigger) wing for the back and something for the front, and expect to increase drag. Also, the change top speed due to additional drag from any reasonable source is a complete non issue for those of us that use the stock ECU and gearing. The governor is at ~155 mph regardless of what the car can do. |
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