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Thread: Drag coefficient

  1. #1
    Senior Member NZVW's Avatar
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    Drag coefficient

    May have been covered prior but here goes.

    I am trying to find out the Drag Coefficient or Cd of the following

    a- MY1973, 911 T ( no front spoiler)
    b-MY 1973, 911 S ( with front spoiler)
    c-My 1973, 911 RS (front spoiler and duck tail)

    Cheers.
    Mark

  2. #2
    Senior Member haul's Avatar
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    Mark,

    no guarantee, but

    here is a list of the aerodynamic values ​​of the various Porsche models:

    Drag coefficient (Cw) x frontal area (A) m2 = drag index



    901 1964: 0,363 x 1,685 = 0,612

    911 MJ 1965 bis 1967 all types (also Targa and S): 0,363 x 1,685 = 0,612
    911 MJ '68 (all Types): Cw x A (m2) = 0,381 x 1,6853 = 0,642
    912: correspond to the 911s of the respective model years
    911 MJ '69-'73 : Cw x A (m2) = 0,408 x 1,71 = 0,697
    911 RS MJ 1973: 0,397 x 1,73 = 0,686
    911 MJ 1974 up to MJ 1977 (also S, Targa): 0,39 x 1,76 = 0,686
    911 SC MJ 1978 up to MJ 1983 (also Targa and Cabrio) and Carrera MJ 1974 up to MJ 1977: 0,40 x 1,77 = 0,708
    911 Carrera 3,2 MJ 1984 up to MJ 1989: 0,39 x 1,77 = 0,690
    911 Carrera 3,2 MJ 1984 up to MJ 1989 with Front- and Rear diffusor/spoiler (also Clubsport):0,38 x 1,77 = 0,672
    911 Turbo (930), (also WTL, SC/RS, Turbo Flachbau): 0,39 x 1,86 = 0,725
    Last edited by haul; 04-20-2021 at 11:27 PM.
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  3. #3
    Senior Member haul's Avatar
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    as i think for comparison

    aerodynamic values ​​of the various Porsche models:

    Drag coefficient (Cw) x frontal area (A) m2 = drag index

    356/1 Gmünd 1948 (offen, mit 2 Personen): 0,45 x 1,41 = 0,648
    356/2 Gmünd Coupé und Cabrio 1948 bis 1950: 0,29 x 1,62 = 0,469
    356 bis MJ 1952: 0,296 x 1,677 = 0.496
    356 bis MJ 1955: 0,365 x 1,692 = 0,618
    356 Speedster bis MJ 1958, Convertible D 1959: 0,377 x 1,640 = 0,618
    356 A: 0,365 x 1,692 = 0,618
    356 B: 0,398 x 1,611 = 0,641
    356 B Roadster: 0,386 x 1,599 = 0,617
    356 B 1600 GS Carrera GTL (Abarth): 0,389 x 1,495 = 0,581
    356 C: 0,398 x 1,611 = 0,641

    550 RS Spyder:
    - 1-Mann-Windschutzscheibe, Beifahrersitz abgedeckt: Cw = 0,290, Cw x F = 131,5
    - Breite Windschutzscheibe mit Seitenfenster (für 2 Insassen): Cw = 0,370, Cw x F = 187
    - Breite Windschutzscheibe mit Seitenfenster (für 2 Insassen), sehr hohes Heck hinter den Insassen, stark abfallend: Cw = 0,310, Cw x F = 157


    904 Carrera GTS: 0,383 x 1,401 = 0,536

    914 1,7 (auch 914/6, 914/8, 914/8 SII) MJ 1970 bis MJ 1973: 0,38 x 1,60 = 0,608
    914 2,0 MJ 1973 und 1974: 0,38 x 1,60 = 0,608
    914 2.0 MJ 1975 und 1976: 0,377 x 1,60 = 0,603

    924 (MJ 1976 bis 1979): 0,36 x 1,76 = 0,634
    924 (ab MJ 1980): 0,33 x 1,79 = 0,591
    924 Turbo (931): 0,34 x 1,79 = 0,609
    924 Carrera GT (937): 0,34 x 1,82 = 0,619
    924S (946): 0,33 x 1,81 = 0,597

    944 (auch S) MJ 1982 bis 1989: 0,35 x 1,82 = 0,637
    944 Turbo (951), (auch S2, Turbo S, 968 Turbo S(?) 0,33 x 1,89 = 0,624
    944 S2 Cabrio MJ 1989 bis 1991 (auch Turbo Cabrio, 968 Cabrio(?) 0,36 x 1,87 = 0,673

    968 Coupé: 0,34 x 1,88 = 0,64

    928 MJ 1978 bis 1982: 0,41 x 1,95 = 0,799
    928 S MJ 1980 bis 1986: 0,38 x 1,95 = 0,741
    928 S4 MJ 1987 bis 1991 (auch CS, GT): 0,34 x 1,98 = 0,673
    928 GTS MJ 1992 bis 1995: 0,35 x 2,02 = 0,707

    986 Boxster: 0,31 x 1,93 = 0,598
    986 Boxster S MJ 2000 bis 2002: 0,32 x 1,93 = 0,617

    987 Boxster: 0,29 x 1,96 = 0,568 (Tiptronic S: 0,30 x 1,96 = 0,588)
    987 Boxster S: 0,30 x 1,97 = 0,591 (Tiptronic S: 0,31 x 1,97 = 0,611)
    987 Boxster Facelift ab MJ 2009: 0,29 x 1,97 = 0,571 (PDK: 0,30 x 1,97 = 0,591)
    987 Boxster S Facelift ab MJ 2009: 0,30 x 1,98 = 0,594 (PDK: 0,31 x 1,98 = 0,614)

    987C (C7) Cayman (S): 0,29 x 1,98 = 0,574
    987C (C7) Cayman S) 0,29 x 1,98 = 0,574 (Tiptronic S: 0,30 x 1,98 = 0,594)
    987C (C7) Cayman Facelift ab MJ 2009: 0,29 x 1,99 = 0,577
    987C (C7) Cayman S Facelift ab MJ 2009: 0,29 x 1,99 = 0,577 (PDK: 0,30 x 1,99 = 0,597)

    9PA Cayenne (V6) MJ 2004: 0,38 x 2,78 = 1,056
    9PA Cayenne S (und Turbo) MJ 2003 + 2004: 0,39 x 2,78 = 1,084
    9PA Cayenne Facelift (auch Turbo): 0,35 x 2,78 = 0,973
    9PA Cayenne S Facelift: 0,35 x 2,79 = 0,9765
    9PA Cayenne GTS: 0,36 x 2,83 = 1.0188
    9PA Cayenne Transsyberia: 0,35 x 2,79 = 0,977
    9PA Cayenne Diesel: 0,36 x 2,78 = 1,00

    970 Panamera S, 4S: 0,29 x 2,33 = 0,676
    970 Panamera Turbo: 0,30 x 2,33 = 0,699

    959: 0,31 x 1,92 = 0,595

    964 (auch RS, RS America, RS N/GT): Cw x A (m2) = 0,32 x 1,79 = 0,573
    964 Turbo (994), (Frere): Cw x A (m2) = 0,35 x 1,88 = 0,658
    964 Turbo (994), (auch WTL, Jubi) (Bongers): 0,36 x 1,89 = 0,680
    964 Turbo S Leichtbau (994), (auch RS 3.8, Turbo 3.6, Turbo 3.6 Flachbau): 0,35 x 1,89 = 0,662

    993 (auch RS): 0,33 x 1,86 = 0,614
    993 RS Clubsport (mit Heckflügel 0° Anstellwinkel): 0,34 x 1,86 = 0,632
    993 RS Clubsport (mit Heckflügel 9° Anstellwinkel): 0,36 x 1,86 = 0,669
    993 GT2: 0,34 x 2,04 = 0,684
    993 turbo (auch 2S, 4S, Turbo Cabrio): Cw x A (m2) = 0,34 x 1,93 = 0,656

    996: Cw x A (m2) = 0,30 x 1,94 = 0,582
    996 4S: 0,30 x 2,00 = 0,60
    996 GT2: 0,34 x 1,96 = 0,666
    996 GT3 MJ 1999 bis 2001: 0,30 x 1,95 = 0,585
    996 Turbo: 0,31 x 2.0 = 0,62

    997: 0,28 x 2,00 = 0,56
    997 Cabrio: 0,29
    997S: 0,29 x 2,00 = 0,58
    997S Cabrio: 0,29
    997 Turbo (auch Cabrio): 0,31 x 2,04 = 0,6324
    997 GT3: 0,29 x 2,00 = 0,58
    997 GT2: 0,32 x 2,05 = 0,656
    997/2 (S) Facelift Coupé: 0,29 x 2,01 = 0,5829
    997/2 (S) Facelift Cabrio: 0,30 x 2,01 = 0,603
    997/2 C4 Facelift: 0,3 x 2,05 = 0,615
    997 C4S Facelift: 0,29 x 2,05 = 0,605
    997/2 C4(S) Cabrio Facelift (auch Targa 4(S): 0,30 x 2,05 = 0,615
    997/2 GT3 3,8: 0.32 x 2,04 = 0,6528
    997/2 GT3 RS 3,8: 0,33
    997/2 Turbo: 0,31
    997/2 Turbo Cabriolet: 0,32

    980 Carrera GT: 0,396 x 1,94 = 0,768
    Last edited by haul; 04-21-2021 at 11:42 AM.
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  4. #4
    Senior Member dirk07's Avatar
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    The Konradsheim RS book shows the comparison.

  5. #5
    Moderator Chuck Miller's Avatar
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    Mark,

    Dirk is right, Konradsheim does show some of what you're looking for....

    Drag Coefficient:

    911S - 0.409 (front spoiler)

    Carrera RS - 0.397 (spoiler and ducktail)

    Hope this helps,
    cm
    Chuck Miller
    Creative Advisor/Message Board Moderator - Early 911S Registry #109
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  6. #6
    Senior Member NZVW's Avatar
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    That is exactly what I was after.
    Thanks guy's.
    Mark

  7. #7
    Senior Member haul's Avatar
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    I find it nice to see, that the 964 has the best values of all the
    “original series” models...

    and let us not forget, that the 60ies
    Alfa Romeo Giulia had a drag coefficient cw of 0,34

    br

    haul
    59 750 pre unit triton
    63 650 gray silver bikinitub triumph thunderbird
    70 650 astralred silver triumph bonneville
    65 912 slate gray "erwin"
    73 914 ravennagreen "ferdl"
    erwin_loves_polo

  8. #8
    Senior Member NorthernThrux's Avatar
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    Saabs were better yet. Around a cd of 0.3.
    Early 911S Registry # 2395
    1973 Porsche 911S in ivory white 5sp MT
    2015 Porsche Macan S in agate grey 7sp PDK

  9. #9
    Senior Member haul's Avatar
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    ........saab
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    59 750 pre unit triton
    63 650 gray silver bikinitub triumph thunderbird
    70 650 astralred silver triumph bonneville
    65 912 slate gray "erwin"
    73 914 ravennagreen "ferdl"
    erwin_loves_polo

  10. #10
    Senior Member ejboyd5's Avatar
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    300 SL cD = 0.389
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