Lowest CD?? (Thanks Zukiru)

Discussion in 'Other Manufacturers' started by WhatIsChazaq, Jun 3, 2008.

  1. Ophbalance

    Ophbalance Administrator Staff Member

    Well, that was far more information than would have wanted ;). I guess I was looking for an answer like, reducing Cd form 0.33 to 0.30 nets you 4-6 more MPG guesstimate.
     
  2. seftonm

    seftonm Veteran Staff Member

    I have a guesstimating Excel document for that. It tells me that for my car, if I were to go from a 0.33Cd to 0.3, I would gain 2.5mpg at 60mph.
     
  3. Ophbalance

    Ophbalance Administrator Staff Member

    That is whole heartedly depressing. Oh well, every little bit helps. Course, it may be unrealistic to have a goal of 50 MPG for an auto slushbox rated at 26.5 combined ;).
     
  4. Zukiru

    Zukiru 0.29 coefficient of drag

    hehe I so almost got a pie in the face!

    I agree that looking more AERO and being so are completely different animals.

    Subaru couldn't give SAAB a car that would completely best the original.
    I can see it now, the SAAb stops accelerating at 130 MPH. the subaru
    says HA HA (simpsons bully) as it continues on to 132. lol
     
  5. WhatIsChazaq

    WhatIsChazaq Active Member

    Next question about Aerodynamics...

    How much does dirt affect FE? My care is normally pretty dirty, rarely gets a bath, much less a wax. Does a squeaky clean and freshly waxed car make much difference in CD...and FE?
     
  6. Vooch

    Vooch Well-Known Member

    UPS used to run an advert that they kept their planes clean because it saved XX zillion gallons a year.


    Dirt matters and it matters if you wax the car to make it slippery - just ask anyone who races boats
     
  7. juglo-j

    juglo-j Well-Known Member

    The GM EV-1 was .19! That's amazing! Maybe the Volt will come close.
     
    Last edited: Jul 22, 2008
  8. pdw

    pdw Well-Known Member

    Their first Saturn Sedan was .24

    The Prius is .26

    That's why I could beat it with the '94 (under certain conditions)

    (Honestly... I had no idea it already had an engine thermos ... and thought thermosing materials under the hood was my invention)
     
  9. JusBringIt

    JusBringIt Be Inspired

    I come in at .36 :eek:

    i think I could lower that quite abit. What I noticed was that cars with the hood coming down past the headlights, have a lower drag coefficient, so that helps quite a bit. I have a wicked front air dam, so I think I'll have to think of something to work around that. Too bad I cant jus fine a big plastic cover to just slide over the front of the bumper and hood that will remove those hood lines and air dam in the front.
     
  10. pdw

    pdw Well-Known Member

    I've heard that a bicycle is around .85 .... I'm not sure how a bike can be so high.
     
  11. Damionk

    Damionk DWL Lover

    I don't think the human body is designed for aerodynamics.
     
  12. pdw

    pdw Well-Known Member

    FASing north down my street .... the 94 Saturn began picking up speed one day.

    This freaked me out .... till I put my hand out the window and the wind was huge from the rear.

    Then I realized .... the direction was also 2% downgrade but that never mattered until the tires were pumped higher and the greatly reduced oncoming wind (drag subtraction via tailwind ... subtracted off an already miniscule Cd).

    My simple deduction was: ... this shape was designed in a windtunnel to achieve the .24, but in reverse it has got to be at least double ... thus creating this big plume of drag to pull it along that way.
     
  13. StefanDodge

    StefanDodge Member

    My G35 is about a 0.27! and the optional aero package will take it to 0.26! This is tempered by the large engine, and RWD layout. But when do a FAS I can accelerate down a small grade from anything below 40 mph. There are a few spots on my commute where i can coast for about a 1/2 mile without slowing. When I try this in my wife's suv, it feels like I hit the brakes.
     
  14. StefanDodge

    StefanDodge Member

    Unless you are Micheal Phelps.
     
  15. Daox

    Daox Well-Known Member

    This is a list I made of vehicles ranked by CdA. I find it pretty interesting. There aren't a ton of vehicles in the list and the ones that are there are defintly hypermiler oriented. Its interesting though what a little change in Cd can get you.

    The height and width are in inches and frontal are is in square feet (W * H * .81 per Hucho's findings). The formula used for CdA is Frontal Area * Cd. The highlighted boxes are actual factory frontal area measurements.

    CdA List

    CdA List.xls (if you want to play with it, see how your vehicle ranks, etc.)
     
  16. Right Lane Cruiser

    Right Lane Cruiser Penguin of Notagascar

    Wow! I didn't know my Elantra was at 0.34! :eek:
     
  17. JusBringIt

    JusBringIt Be Inspired

    need some tips :p.

    When I found out mine was .36 I had to make amends, the counterpart (sebring) is .32 with a less sporty front bumper so with my improved bumper, I'm guessing that gives me about 0.27-.28 unofficially, maybe better. The front bumper on my car is extremely aggressively shaped so it does pretty well with the mod. The rest of the body is very aerodynamic so not much can be done there aside from closing down the hood.

    I'll do some underbody, that should get me to about .25. with the suggestion from basjoos about leaving some airflow for the cat, I should get a pretty efficient system going here.
     
  18. My vehicle drag coefficient:
    2004 Toyota Prius .26
    2003 Ford Explorer .41
    2001 Nissan Xterra ?? cant find it
     
  19. nissynis

    nissynis NC Attorney

    Oh I just had to chime in: my shared FSP has a Cd of 0.51. :eek:
     
  20. PaleMelanesian

    PaleMelanesian Beat the System Staff Member

    As best as I can tell, my civic is somewhere around .35. From Daox's list, the 98-2000 SI was .34. That one only came in 2-door, which is slightly more aero than my 4-door. So I added a point.
     

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