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Old 02-11-2008, 01:32 PM   #1 (permalink)
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Planning Aero Mods

Ok so as I fine tune my driving and EOC - i thought i would begin the brainstorming on what Aero mods i think would be biggest impact.

I have some areas in front i can close up ( holes for fog lights i do not have) - as well as Upper radiator area ( big bottom area still open)

I like the idea of the rear wheel skirts - and think that will integrate will with the car.

Overall lowering of the car a little as well.

One area i want to throw out there is the rear of the car.
This is a sedan - and there are a lot of discussions on boat tail / Kammback's here...

Has anyone thought through modiftying a seden to a Kammback style? fill in the area from the window to the end of the trunk? This would be the LAST item i would actually get to as this is a bit involved - but for your senior guys / advanced modders, is this something reasonable? in theory it sounds good - but in practice ( as i am very much a noob) wanted to bang on it a while.

Thanks for your inputs

Steve

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Old 02-11-2008, 03:17 PM   #2 (permalink)
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Just to give everyone something to look at here's a few pics of an '00 Altima.








Doesn't look like too bad of a shape, aerodynamically speaking. It just needs a little smoothing out here and there.

-Lowering
-Wheel skirts
-Grilleblock (there sure are lotsa' openings up there)
-Mirror delete (it may be the pic, but they look huge)
-Airdam or bellypan
-Boattail off of the trunk

Rideheight would be a great place to start, plus lowering springs should be easy to find for this car. That would also take care of a lot of the extra gap in the wheel-wells.

As for the boattail, I don't see that much to be gained from starting it up at the roof. The transition is already pretty good from roof to trunk. Perhaps it just needs a few VG's to help like the Mitsubishi EVO.
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Old 02-11-2008, 06:18 PM   #3 (permalink)
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Hi Doof...,

I read somewhere that there is a NO-GO range for rear glass angle on a three box vehicle. Something like less than 15 degrees (almost flat - like a Prius) and greater than some number - 55 degrees? The rear glass on that car looks to be in the high-drag zone. So, a C pillar spoiler might help.
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Old 02-11-2008, 06:36 PM   #4 (permalink)
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Doof -

Here's an example picture for fun :

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Old 02-11-2008, 06:46 PM   #5 (permalink)
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some more, each car is different that's why simple tuft testing is the shorter path. glue on some yarn, have your buddy take some pictures at 60 mph see where the separation gets really pronounced, that where your panels need to start. it could be the top the windshield on a truck, it could be half way down the back on a bug.

the back window on the Altima looks to be about 25 degrees from the pic
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Old 02-11-2008, 07:21 PM   #6 (permalink)
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Old 02-11-2008, 07:30 PM   #7 (permalink)
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Hey Doof. What kind of driving are you doing? If it's mostly city just go with a grill block and front undertray. The best thing, if you can swing the price, is instrumentation.
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Old 02-12-2008, 12:03 AM   #8 (permalink)
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Quote:
Originally Posted by AndrewJ View Post
As for the boattail, I don't see that much to be gained from starting it up at the roof. The transition is already pretty good from roof to trunk. Perhaps it just needs a few VG's to help like the Mitsubishi EVO.
How about this redraw. LOL
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Old 02-12-2008, 11:26 AM   #9 (permalink)
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Quote:
Originally Posted by bestmapman View Post
How about this redraw. LOL


Didn't they use this car in the old movie "Logans Run" ?
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Old 02-12-2008, 11:35 AM   #10 (permalink)
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I think the magic number is 11 degrees. There is to much slope from the roof line. There would be early seperation of airflow off the roof. I thing Carlos has the ridght idea with sloping the roof line in a gradual decreasing angle until you hook it up with the boat-tail at the rear of the car. Same hold true for the under belly when bringing it up past the bumper.

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