Originally posted by ncrmtrsprtsE30
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E30 Aerodynamics
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Originally posted by LJ851kingston is the play by play announcer for this thread.
Originally posted by unloadedak#teamross
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Originally posted by Wh33lhop View PostLove the exhaust. Is the bumper ever going back on?
Originally posted by MPLFoster View Postfucking cool^
Originally posted by the imitator View PostReally like that exhaust look, how it comes straight out of the bodywork makes it look like it was meant that way, not just improvised.
edit: for pics.
Last edited by ncrmtrsprtsE30; 05-22-2015, 10:30 PM.
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Nice car!!Originally posted by LJ851kingston is the play by play announcer for this thread.
Originally posted by unloadedak#teamross
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'89 325is S50 Track Montser
'04 X5 Daily/Tow Vehicle
http://www.avarestoration.com
http://www.myspace.com/brendanfiddle
Click here if you want to be my zombie slave...
http://www.youtube.com/user/Fidhle007
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'89 325is S50 Track Montser
'04 X5 Daily/Tow Vehicle
http://www.avarestoration.com
http://www.myspace.com/brendanfiddle
Click here if you want to be my zombie slave...
http://www.youtube.com/user/Fidhle007
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Originally posted by ncrmtrsprtsE30 View Postthanks! nope bumper is staying off, too much weight. lol
:up: thanks!
Yep, I just need to put a heat shield around where it comes out so it looks cleaner.
edit: for pics.
how much did you spend on that rear diffuser, alumilite is not cheap!
i made my front splitter out of it $100 later
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Originally posted by ncrmtrsprtsE30 View Post
quick comment on the above - you might find you're actually creating drag with this diffuser, assuming the front edge is open?
Might be worth making some holes either side of the exhaust just above the diffuser to let any air out which is above the diffuser plane? Or you could extend it all the way through to the front splitter, but this is much more work and might cause problems with the exhaust system and diff oil temps..
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bumping this back up because I am trying to keep this type of discussion going...
Originally posted by kingston View PostOriginally posted by MX339 View Post
Those are just the standard M3 plastic filler pieces. You'd have the come up with your own pieces and a way to mount them onto the valence.
Up front, I want to create something that will connect the iS lip to a red46 skidplate, then behind that I want to put the transmission skidplate back on.
The idea is not to make the entire bottom flat, but to eliminate as many voids under the car where air can tuck in and create lift.
Also, I had a link to those vortex generators on the first page and they were only a few bucks a pop. I want to buy 5 of them to mount to the roof. I have been trying to get my hands on a M3 C-pillar cover, but it seems like a fruitless endeavor so Im going to try a different, more modern aero approachSimon
Current Cars:
-1999 996.1 911 4/98 3.8L 6-Speed, 21st Century Beetle
Make R3V Great Again -2020
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Originally posted by e30_302 View PostMy concern with a flat bottom is heat management. Of course we do endurance racing so it may be more of an issue for us than others. A deep air dam and side skirts are low hanging fruit with little downside.
Originally posted by RoccoB517 View PostI added a full flat bottom and diffuser to the aero package, and let me tell you, it made a HUGE difference.
Originally posted by 2mAn View PostThis is an amazing thread. Funny Ive been reading about aero underbody stuff and nobody has gone to the extent you've have (or at least shared it here). The only thing Im wondering about with the underbody stuff is the trans and diff temps, have you seen an increase? I noticed a NACA duct style for the diffOriginally posted by RoccoB517 View PostI do think the diff temps are getting higher than I would like. I will be installing a diff cooler during the off-season this year. I haven't had any issues with the trans. I have been keeping an eye on the fluids, and it seems like the trans fluid is doing okay and the diff has to be changed more frequently with the lower amount of airflow.Originally posted by RoccoB517 View PostI noticed the difference in the way the car felt in the very first lap after installing the flat bottom. The aero load from the wing and splitter definitely increased, and the car feels less "floaty". Sometimes inconsistent track surfaces at speeds north of say 90 mph would cause the car to bob a little. It stays flat now.
The next time I have the under tray off I'll snap some pics of the mounts for you guys. It's really just simple 1" flat strap bent into an L shape. The bottom has a nutsert to allow the under tray to be bolted up, and the other end is a single 1/4-20 nut and bolt through the pinch weld at the bottom of the rocker. I basically created mounting points that clear all of the mess under there, and they attach at the same points as the side skirts.
Simon
Current Cars:
-1999 996.1 911 4/98 3.8L 6-Speed, 21st Century Beetle
Make R3V Great Again -2020
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I want to leave more exposed than he did.
if you leave something to cause turbulence, the air will very seldom reattach.
It has to be smooth from in front of the front bumper/air dam.
And incremental gains are made from the front back, as in, if you smooth to the front doors
you gain some, if you smooth to the rear axle, you can get more,
and if you smooth all the way back, then something like a diffuser starts to become
predictable and possibly even tunable.
I read a few books a long time ago...
tnow, sometimes I just mess with people. It's more entertaining that way. george graves
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