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Detroit, 10:34 PM
Mon Nov 9
27 posts in the last 24 hours

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  • posts about #cardesign more →

    Under-Body Aerodynamics Ain't Just For Looking Awesome

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  • Your version of Internet Explorer is not supported. Please upgrade to the most recent version in order to view comments.
    Dsmvwl  Admin  Promote to frontpage Approve user Ban user ×
    Image of Elhigh Elhigh
    04:06 PM

    In reply to Under-Body Aerodynamics Ain't Just For Looking Awesome
    If I recall correctly the new Euro-spec diesel Civic also has a nicely bellypanned underside. It's all the rage on Ecomodder too, adding a pan to all manner of rides.

    Some of the guys there are regularly wringing over 70mpg out of their modded Metros. They may not be fast, but they get the speed back by skipping a whole stack of 10-minute fuel stops. #cardesign
     Reply
    Elhigh was starred Elhigh was unstarred
    Image of Mobius Mobius
    03:35 PM

    In reply to Under-Body Aerodynamics Ain't Just For Looking Awesome
    Of course there's a car with more powerful underbody aero, it's the F1 car driven by Ayrton Senna! #cardesign
     Reply
    Mobius was starred Mobius was unstarred
    Image of evoCS-Hench-Minion to the stars evoCS-Hench-Minion to the stars
    02:59 PM

    In reply to Under-Body Aerodynamics Ain't Just For Looking Awesome
    The undertray at the front of my Evo is a blessing and a curse. While it does keep things tidy under the engine compartment, it is a royal pain to remove. It's a multi piece affair that is held on with seemingly hundreds of Mitsu-specific clips and screws. The front jack point is under one section and the fastener count stops at about 14. Just when you think you've got them all off, you yank on the part and find one or two missed fasteners foiling your efforts.

    Other than that, I love that car. #cardesign
     Reply
    evoCS-Hench-Minion to the stars was starred evoCS-Hench-Minion to the stars was unstarred
    Image of Doshu Doshu
    06:41 PM

    @evoCS-Hench-Minion to the stars: I hit a rabbit at speed (weekend run from Melbourne to Adelaide and back) and ripped the under-tray off my IX. I think I only recovered half of those bloody fasteners. #cardesign
     Reply
    evoCS-Hench-Minion to the stars promoted this comment Doshu was starred Doshu was unstarred
    Image of evoCS-Hench-Minion to the stars evoCS-Hench-Minion to the stars
    07:01 PM

    @Doshu: I think we're both ready to plunk down some cash for the Beatrush undertray.
     Reply
    evoCS-Hench-Minion to the stars was starred evoCS-Hench-Minion to the stars was unstarred
    Image of Novaload Novaload
    12:36 PM

    In reply to Under-Body Aerodynamics Ain't Just For Looking Awesome
    That does completely look like a toy. #cardesign
     Reply
    Novaload was starred Novaload was unstarred
    Image of toasteroven toasteroven
    12:22 PM

    In reply to Under-Body Aerodynamics Ain't Just For Looking Awesome
    Pic is an Evo. Best underside? Veyron. #cardesign
     Reply
    Novaload promoted this comment toasteroven was starred toasteroven was unstarred
    Image of Old Grimey Old Grimey
    12:05 PM

    In reply to Under-Body Aerodynamics Ain't Just For Looking Awesome
    What the H... that's a remote-controlled toy car! And Jalopnik isn't a toy car site, even when the 24 Hours of LeMons tribute plastic models get shown. What's the world coming to!!!

    Seriously, I'm guessing the car above is some sort of LeMans or GTP car, possibly the recent Cadillac or Bentley designs, or the Lister Storm. #cardesign
     Reply
    Novaload promoted this comment Old Grimey was starred Old Grimey was unstarred
    Image of 500wishes 500wishes
    11:59 AM

    In reply to Under-Body Aerodynamics Ain't Just For Looking Awesome

    88 lotus f1 movable skirt doesn't require an underbody plate

    it is as far as you can take it as even the FIA banned it when the realised the major advantage it gave Lotus #cardesign
     Reply
    Novaload promoted this comment 500wishes was starred 500wishes was unstarred
    Image of Racin_G73 - dirt track legend (some day ... maybe) Racin_G73 - dirt track legend (some day ... maybe)
    11:08 AM

    In reply to Under-Body Aerodynamics Ain't Just For Looking Awesome
    I can see this technology making its way into LeMons racing... I'm thinking maybe some of those old 70's "sheet" sleds, stapled to the plastic body ground effects pieces, sealed up with "200 mph duct tape" to keep air from penetrating?

    Or if you're really an evil genius, you could find some way to make yourself a fan car and potentially earn the dangerous homemade performance mod award... #cardesign
     Reply
    Novaload promoted this comment Racin_G73 - dirt track legend (some day ... maybe) was starred Racin_G73 - dirt track legend (some day ... maybe) was unstarred
    Image of BigEngineSmallCar BigEngineSmallCar
    09:51 AM

    In reply to Under-Body Aerodynamics Ain't Just For Looking Awesome
    When I was about 12 my dad had a ground effects super vee Anson SA6. He was working on the throttle cable because it broke or jammed or something like that, I don't quite remember. But what I do remember is that he dropped one of the most critical screws that connected the throttle cable to the Bosch Motronic fuel injection down into the engine bay of this super tightly packaged formula car. This car was about half an inch off the ground and we didnt have any way of lifting the car in the air. So me being the smallest one, I was the only one who could squeeze into the ground effects tunnel between the axles and suspension in 110 degree heat at Cali Speedway to disassemble the sealed underside of this formula car. Well after getting greasy, a soda break, and a handful of expletives that were not well liked by my mother I got the screw and sealed the under-tray. Apparently a 12 year old kid dismantling at what the time was a pretty state of the art car for privateer racers while the car was still on the ground leaves an impression on people, so to this day because of that damn sealed underside people at the track still crack jokes that they only recognize me from the waist down. #cardesign
     Reply
    skitter promoted this comment BigEngineSmallCar was starred BigEngineSmallCar was unstarred
    Image of Sloop_John_B Sloop_John_B
    10:06 AM

    @BigEngineSmallCar: Hah, that's awesome. Nice story. #cardesign
     Reply
    Sloop_John_B was starred Sloop_John_B was unstarred
    Image of Hoser Dave Hoser Dave
    09:49 AM

    In reply to Under-Body Aerodynamics Ain't Just For Looking Awesome

    Porsche Panamera design of underbody with cooling ducts #cardesign
     Reply
    YankBoffin promoted this comment Hoser Dave was starred Hoser Dave was unstarred
    Image of crxtra crxtra
    11:15 AM

    @Hoser Dave: That's the best view of the Panamera I've seen yet. #cardesign
     Reply
    FTGDWolverineEdition'09 promoted this comment crxtra was starred crxtra was unstarred
    Image of that ain't the way to have fun, son that ain't the way to have fun, son
    09:47 AM

    In reply to Under-Body Aerodynamics Ain't Just For Looking Awesome
    Visible leaks are a thing of the past! #cardesign
     Reply
    that ain't the way to have fun, son was starred that ain't the way to have fun, son was unstarred
    Image of P161911 probably shoudn't have P161911 probably shoudn't have
    09:50 AM

    @I was drivin' that Model A: Some sort of access panel for the oil drain and filter would be nice. I guess if you have one of these on your car you can either afford a lift or for someone else to change your oil. #cardesign
     Reply
    P161911 probably shoudn't have was starred P161911 probably shoudn't have was unstarred
    Image of that ain't the way to have fun, son that ain't the way to have fun, son
    10:01 AM

    @P161911 probably shoudn't have:

    My '95 E320 is supposed to have the oil changed via a suction pump shoved down the dipstick tube.

    Meh.

    I like to poke around under there when changing oil. Although I did find, on the 4.2L motor in the W126, there was a solid 8-10 ounces which sat in an area draining would not remove...unless you had the car's nose at a 30° upward angle. #cardesign
     Reply
    that ain't the way to have fun, son was starred that ain't the way to have fun, son was unstarred
    Image of stoke stoke
    09:17 AM

    In reply to Under-Body Aerodynamics Ain't Just For Looking Awesome
    That NACA duct feeding the rear diff gets me all hot and bothered.

    Which is the exact opposite of its intended function, amusingly. #cardesign
     Reply
    jbownsabmw- Koopas Beware promoted this comment stoke was starred stoke was unstarred
    Image of SagarikaLumos SagarikaLumos
    09:08 AM

    In reply to Under-Body Aerodynamics Ain't Just For Looking Awesome
    I'm guessing Mitsubishi EVO for the picture.

    The problem is that, even on an EVO, 99.999% of the private owners of cars would so NO benefit from this type of belly tray. It only complicates changing the oil or finding leaks, too.

    This type of crossover tech from race cars is dysfunctional on a street-use car. #cardesign
     Reply
    Michael Banovsky promoted this comment SagarikaLumos was starred SagarikaLumos was unstarred
    Image of Michael Banovsky Michael Banovsky
    09:27 AM

    @SagarikaLumos: I'd also say Evo X. It's not the Impreza because Subaru tends to run their exhaust much closer to the driveshaft. #cardesign
     Reply
    Michael Banovsky was starred Michael Banovsky was unstarred
    Image of SagarikaLumos SagarikaLumos
    11:01 AM

    @Michael Banovsky: The giveaway for it being an EVO to me is the little set of fins on the rear diffuser. Mitsu's loved those little fins so much that they decorated the trailing edge of the roof of one variant with them. It would help if the photo was centered under the car so that some more detail would be evident. #cardesign
     Reply
    SagarikaLumos was starred SagarikaLumos was unstarred
    Image of OakleyApsyrtus OakleyApsyrtus
    09:00 AM

    In reply to Under-Body Aerodynamics Ain't Just For Looking Awesome
    Honda S2000 with a JDM aftermarket underbody
     Reply
    YankBoffin promoted this comment OakleyApsyrtus was starred OakleyApsyrtus was unstarred
    Image of YankBoffin YankBoffin
    09:11 AM

    @OakleyApsyrtus: That seems like a good guess:
    -fancied up unibody.
    -exhaust on RH side.
    -looks relatively compact. #cardesign
     Reply
    YankBoffin was starred YankBoffin was unstarred
    Image of PotbellyJoe - As seen on I-287 PotbellyJoe - As seen on I-287
    09:25 AM


    @OakleyApsyrtus: Correct.

    Here's another view. #cardesign
     Reply
    snapoversteer 'bout to get told promoted this comment PotbellyJoe - As seen on I-287 was starred PotbellyJoe - As seen on I-287 was unstarred
    Image of Ray Wert Ray Wert
    10:05 AM

    @OakleyApsyrtus: You guys are so good! #cardesign
     Reply
    Ray Wert was starred Ray Wert was unstarred
    Image of Bertone77 Bertone77
    09:00 AM

    In reply to Under-Body Aerodynamics Ain't Just For Looking Awesome
    Underbody aero is a good way to get the car to stick to the track better, But I wonder if it would increase or decrease MPG? I would think that making the car slicker would increase , but then again the extra down force could negate that gain? #cardesign
     Reply
    Bertone77 was starred Bertone77 was unstarred
    Image of YouTouchedMyHappyPlace YouTouchedMyHappyPlace
    09:28 AM

    @Bertone77: It would decrease MPG but the downforce you would receive would be worth it on the track. I'd hate to make generalizations but I think that any downforce mod would increase cD. #cardesign
     Reply
    YouTouchedMyHappyPlace was starred YouTouchedMyHappyPlace was unstarred
    Image of HammSammich HammSammich
    10:01 AM

    @YouTouchedMyHappyPlace: I don't think that is correct. The benefit of the so-called "ground-effect" Formula One cars in the late 1970's and early 1980's was that they could generate massive amounts of downforce without significantly increasing aerodynamic drag. #cardesign
     Reply
    HammSammich was starred HammSammich was unstarred
    Image of YouTouchedMyHappyPlace YouTouchedMyHappyPlace
    11:13 AM

    @HammSammich: Thats why I said I was making a generalization. You even said that it did increase drag albeit not significantly. I think we can all agree that in most cases for street cars, anything that adds downforce is usually at the expense of a little bit of cD. #cardesign
     Reply
    YouTouchedMyHappyPlace was starred YouTouchedMyHappyPlace was unstarred
    Image of HammSammich HammSammich
    11:26 AM

    @YouTouchedMyHappyPlace: I didn't say it added aerodynamic drag. Indeed your generalization is incorrect, increasing downforce does not increase the coefficient of drag, a measure of aerodynamic resistance. That having been said, all things equal an underbody treatment that increases downforce will reduce fuel efficiency (albeit not nearly as much as a similar increase in downforce due to a wing or other drag increasing element). Again, this is not due to an increase in aerodynamic resistance, but due to the increase in mechanical friction of the tires on the pavement - essentially at speed the car will "weigh more." I do agree with you, that if fuel efficiency is the primary goal, reducing downforce of any kind is likely beneficial. #cardesign
     Reply
    FTGDWolverineEdition'09 promoted this comment HammSammich was starred HammSammich was unstarred
    Image of Paul Y. don't drive too fast. Paul Y. don't drive too fast.
    12:56 PM

    @Bertone77: It depends. Most cars with underbody panels are meant to generate downforce, but they don't have to; a lot of the serious hypermiling nerds (I'm a mere amateur) will build underbody panels to generally cut drag. #cardesign
     Reply
    Paul Y. don't drive too fast. was starred Paul Y. don't drive too fast. was unstarred
    Image of FTGDWolverineEdition'09 FTGDWolverineEdition'09
    12:57 PM

    @HammSammich: I don't completely agree with you about the reduction in MPG. If done right and with proper analysis, you can actually slightly increase the MPGs. Because of the reduced turbulence at high speeds.

    In fact the 2010 Toyota Prius has an underbody aero tray.

    The tray by itself doesn't do much, they are a whole bunch of other things which affect it's performance.

    But then again, I am no expert in aerodynamics, just giving my humble opinion. #cardesign
     Reply
    FTGDWolverineEdition'09 was starred FTGDWolverineEdition'09 was unstarred
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