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08-08-2012, 12:45 AM | #1 |
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purpose of rear diffuser?
i know it may sound like a silly question, but i am asking because i really dont know...
i know it looks cool and all, but does it actually serve a purpose??? just curious, because i want to get one to match the lip i just got, but at the same time, i have not found my self dropping $300-500 on one... help please.
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08-08-2012, 08:09 AM | #3 |
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08-08-2012, 10:44 AM | #4 | |
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08-08-2012, 01:56 PM | #5 |
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Yep, there's a chance that the Varis and Platte Forme diffusers actually create downforce.
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08-08-2012, 02:23 PM | #6 |
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Most of E9X M3 carbon fiber rear diffuser is from:
Tradition of looking cool since E46M3 CSL. I think.
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08-08-2012, 02:41 PM | #7 | |
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None of the diffusers will do what they are truly supposed to. Yes some like the Varis to make the very rear of the car streamlined and have channels, however, it is doing nothing to channel air from the front to rear to stabilize the car.
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08-08-2012, 02:49 PM | #8 |
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Why not do both…
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08-08-2012, 03:26 PM | #9 | |
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The fella at Downforce USA who designed and produces the diffuser that Platte Forme a.g. sells told me a bunch of things over the 30 minutes I talked to him before SEMA....too bad most of those big words and theories and such flew clear over my head, in one ear and out the other. However, the take-away that I got from all of it is that, supposedly, when you have the complete kit, their kit (as I can't speak for Varis's unit but I've seen it in person, excellent craftsmanship btw.) was designed to reduce drag, rather than create downforce.
Do I have proof that it works? Nope, I don't, sorry. Wish I could afford to rent a wind tunnel at $500+ an hour just to satiate your guys' curiosities, since if I could spend $500 an hour just because I was bored in order to debunk every single downforce claim made on the internet, I would probably have no financial worries in life. I'd still probably buy a Veyron before that though, to be honest. Anyways, I don't think anyone other than M24 and BMW GmbH can claim to have proof that any of the stuff that they design truly works, though I can tell you my front splitter and rear wing worked very well, even without optimized wind tunnel testing. But that's getting a bit off topic, sorry. Quote:
Last edited by LateBraking; 08-08-2012 at 03:33 PM.. |
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08-08-2012, 04:18 PM | #10 | |
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08-08-2012, 05:20 PM | #11 |
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No diffuser is going to do anything meaningful without a full underbody. Diffusers on street cars are for looks generally.
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08-08-2012, 05:46 PM | #12 | |
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It's like Honda saying "Race Inspired" technology, versus something that actually is built for racing. Any ways, lets carry on. Nothing made for the E9x under-body to date is wind tunnel tested and optimized for this car, yet.
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08-08-2012, 06:02 PM | #13 |
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Really, E46M3 CSL is where it all started.
Notice we still love CSL trunks on E9X M3s? Same with diffusers. that where it all started and many places make their own "modified design" diffusers but CSL is the origin of the no-function carbon fiber diffuser trend.
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08-08-2012, 11:09 PM | #14 | |
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I have officially attacked by the mod bug... I'm going to order the spoiler and diffuser next week.. And in two months an x pipe, axle back and tune... Then I'll be done for a while. Lol
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08-08-2012, 11:12 PM | #16 | |
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I love my m3 it never ever gets old. I got a vrs lip and I just can't stop staring at how great it looks. Lol Cheers to my fellow m3 drivers
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08-08-2012, 11:18 PM | #17 |
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You'll never be done, not even for a while. It's been maybe two weeks since I parted out? Now I'm looking at suspension and wheels again....
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08-08-2012, 11:24 PM | #18 | |
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so i then told myself well if i get an expensive german car i wont need mods... and damn, was i wrong...lmao
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08-08-2012, 11:30 PM | #19 |
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Just cosmetic IMO
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08-18-2012, 12:13 AM | #21 |
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Rear diffusers are normally supposed to reduce drag by creating a larger area for air pressure to equalize under the car. THis kind just makes ur car look sexy. Massdrop is selling some right now, I ordered an audi grill from them. Still waiting on delivery because of shipping but I'm more concerned about price than time xD.
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