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    1. Exercise to see if a single class formula can produce a variable number of classes
    2. Exercise to see if a single class formula can produce different points for different "flavors"?
    3. Two types of classes and modification structures
    4. A list of Specs for Porsche Cars


    Can a single, common class formula produce a variable number of classes?

    Although we are not ready to assign classes yet, I wondered if it was feasible to have "rules" for the
    car classes that could easily produce any number of classes (for small and large Regions). So I
    experimented with formulas to compute AX and TT classes. Knowing that many pure racing classes use
    lbs/hp as the basis for their classes, but that true AX performance depends heavily on low weight, I made
    these formulas different for AX and TT: I used the car weight plus lbs/hp for the AX classes, but used top
    velocity plus lbs/hp for the TT classes. The formulas I came up with are:

        AX Class = (HP/Lbs^2)*40000*F

        TT Class = (Vel*F*HP/Lbs)-2.2

    The "40000" and "2.2" make the classes come out to be 1 thru 9...they have no other function. The choice
    of 1 thru 9 was arbitrary. A little farther down, I will show how these formulas can be modified to include
    Span and Offset variables, so that any number if classes can be created. When I do, these two numbers
    will make more sense. But a very similar formula could produce an abstract number, in any range. Later,
    I will do this and create values in the 850-1000 range (this is the actual range of AX times from Parades;
    ie, the fastest car class times are about 85% of the slowest).

    Knowing also that (especially for AXing) car drive configuration is a big factor, I added a fudge factor.
    Thus F is a factor which depends on the car configuration and type of event. For AX:

    Front Engine + Rear Drive --> F = 1.0
    Rear Engine + Rear Drive --> F = 0.9
    Mid Engine + Rear Drive --> F = 1.1

    Believing that for TTing, the drive layout is less of a factor, I halved it for TT:

    Front Engine + Rear Drive --> F = 1.0
    Rear Engine + Rear Drive --> F = 0.95
    Mid Engine + Rear Drive --> F = 1.05

    These "F" factors are SWAGs...they are there to make the results believable and can be adjusted later.

    I created a spreadsheet for the 912, 914, early 911, and 924 models. I picked these because I had
    complete technical data for them...no other reason. I added a 1993 RS America as a "control" for the
    newer, "higher" performance cars. These are the results I got:

                  AX TT
Year(s) Model Size (type) Weight HP Torque Pound/HP Speed Class Class
1965-1968 912 1.6 912 2138 102 120 21.0 117 4 3
1969 912 1.6 912 2090 102 120 20.5 117 5 3
1976 912E 2.0 912E 2557 86 98 29.7 110 1 1
Year(s) Model Size (type) Weight HP Torque Pound/HP Speed Class Class
1970-1972 914 1.7 47 1984 80 99.5 24.8 108 4 2
1973 914 1.7 47 2138 72 87 29.7 104 2 1
1973 914 2.0 47 2138 95 105 22.5 114 4 3
1973 914 2.0 47 2138 100 119 21.4 116 4 3
1974 914 1.8 47 2138 76 91 28.1 106 2 1
1974 914 1.8 47 2138 85 106 25.2 110 3 2
1974 914 2.0 47 2138 95 105 22.5 114 4 3
1974 914 2.0 47 2138 100 119 21.4 116 4 3
1975 914 1.8 47 2205 76 91 29.0 106 2 1
1975 914 1.8 47 2205 85 106 25.9 110 3 2
1975 914 2.0 47 2205 88 103 25.1 111 3 2
1975 914 2.0 47 2205 100 119 22.1 116 4 3
1976 914 1.8 47 2205 85 106 25.9 110 3 2
1976 914 2.0 47 2205 88 103 25.1 111 3 2
1976 914 2.0 47 2205 100 119 22.1 116 4 3
1970-1972 914-6 2.0 914 2072 110 116 18.8 120 6 4
Year(s) Model Size (type) Weight HP Torque Pound/HP Speed Class Class
1964-1967 911 2.0 911 2381 130 129 18.3 127 5 4
1967 911S 2.0 911 2381 160 132 14.9 136 6 6
1968 911L 2.0 911 2381 130 129 18.3 127 5 4
1969 911T 2.0 911 2249 110 116 20.4 120 4 3
1969 911E 2.0 911 2249 140 129 16.1 130 6 5
1969 911S 2.0 911 2249 170 134 13.2 138 8 7
1970-1971 911T 2.2 911 2249 125 130 18.0 125 5 4
1970-1971 911E 2.2 911 2249 155 141 14.5 134 7 6
1970-1971 911S 2.2 911 2249 180 147 12.5 141 9 7
1972-1973 911T 2.4 911 2370 130 145 18.2 127 5 4
1972-1973 911E 2.4 911 2370 165 152 14.4 137 7 6
1972-1973 911S 2.4 911 2370 190 159 12.5 144 8 8
Year(s) Model Size (type) Weight HP Torque Pound/HP Speed Class Class
1977-1982 924 2.0 924 2623 125 122 21.0 125 3 3
1977-1982 924 2.0 924 2623 95 105 27.6 114 1 2
1977-1982 924 2.0 924 2623 110 115 23.8 120 2 2
1988 924S 2.5 924 2734 160 155 17.1 136 4 5
1986-1987 924S 2.5 924 2734 150 145 18.2 133 4 4
1980-1982 924 Turbo 2.0 931 2822 156 150 18.1 135 3 4
1980-1982 924 Turbo 2.0 931 2822 177 170 15.9 140 4 6
Year(s) Model Size (type) Weight HP Torque Pound/HP Speed Class Class
1993 RS America 3.6 964 2950 247 228 11.9 157 7 9

    Note that the AX classes are different from the TT classes. For an AX, low weight is especially
    important. For a TT, high hp to weight and high top speed are important. Also, note that I included torque
    in the table, but didn't use it (yet).

    I've noticed, after reading lots of Rules Books, most groups list their classes something like the following:

AX  
Class 1 1976 912E, 1977-1982 924 (95 HP)
Class 2 1973 914 1.7 (72 HP), 1974-1975 914 1.8 (76 HP), 1977-1982 924 (110 HP)
Class 3 1974-1976 914 1.8 (85 HP), 1975-1976 914 2.0 (88 HP), 1977-1982 924 (125 HP), 1980-1982 924 Turbo (156 HP)
Class 4 1965-1968 912, 1970-1972 914 1.7, 1973-1974 914 2.0, 1975-1976 914 2.0 (100 HP), 1969 911T, 1988 924S,
  1986-1987 924S, 1980-1982 924 Turbo (177 HP)
Class 5 1969 912, 1964-1967 911, 1968 911L, 1970-1073 911T
   
Class 6 1970-1972 914-6, 1967 911S, 1969 911E
Class 7 1970-1973 911E,1993 RS America
Class 8 1969 911S, 1972-1973 911S
Class 9 1970-1971 911S
   
TT  
Class 1 1976 912E, 1973 914 1.7, 1974-1975 914 1.8
Class 2 1970-1972 914 1.7, 1974-1975 914 1.8, 1975-1976 914 2.0 (88 HP), 1977-1982 924
Class 3 1965-1969 912, 1973-1974 914 2.0, 1975-1976 914 2.0 (100 HP), 1969 911T, 1977-1982 924 (125 HP)
Class 4 1970-1972 914-6, 1964-1967 911, 1968 911L, 1970-1973 911T, 1986-1987 924S (150 HP), 1980-1982 924 Turbo (156 HP)
Class 5 1969 911E, 1988 924S
Class 6 1967 911S, 1970-1973 911E, 1980-1982 924 Turbo
Class 7 1969-1971 911S
Class 8 1972-1973 911S
Class 9 1993 964 RS America

    I challenge you to time yourself as you find the AX class for a 1975 914 2.0 with the cherished CA anti-
    smog options (ie, 88 HP) in the above list. Not easy is it. Remember also that when ALL the Porsches
    are included, these lists will be longer. Now try to find that same car in the following table:

912 AX TT
1965-1969 912 4 3
1969 912 5 3
1976 912E 1 1
914 AX TT
1970-1972 914 1.7 4 2
1973 914 1.7 2 1
1973 914 2.0 (95 HP) 4 3
1973 914 2.0 (100 HP) 4 3
1974 914 1.8 (76 HP) 2 1
1974 914 1.8 (85 HP) 3 2
1974 914 2.0 (95 HP) 4 3
1974 914 2.0 (100 HP) 4 3
1975 914 1.8 (76 HP) 2 1
1975 914 1.8 (85 HP) 3 2
1975 914 2.0 (88 HP) 3 2
1975 914 2.0 (100 HP) 4 3
1976 914 1.8 (85 HP) 3 2
1976 914 2.0 (88 HP) 3 2
1976 914 2.0 (100 HP) 4 3
1970-1972 914-6 6 4
911 AX TT
1964-1967 911 2.0 5 4
1967 911S 2.0 6 6
1968 911L 2.0 5 4
1969 911T 2.0 4 3
1969 911E 2.0 6 5
1969 911S 2.0 8 7
1970-1971 911T 2.2 5 4
1970-1971 911E 2.2 7 6
1970-1971 911S 2.2 9 7
1972-1973 911T 2.4 5 4
1972-1973 911E 2.4 7 6
1972-1973 911S 2.4 8 8
924 AX TT
1977-1982 924 (125 HP) 3 3
1977-1982 924 (95 HP) 1 2
1977-1982 924 (110 HP) 2 2
1980-1982 924 Turbo (156 HP) 4 5
1980-1982 924 Turbo (177 HP) 3 4
1988 924S (160 HP) 4 4
1986-1987 924S (150 HP) 4 6
964 AX TT
1993 964 RS America 7 9

    I find this last way MUCH easier to use if you are looking for the class that a specific car is in. And it's
    more compact too! Actually, both table forms are useful, but to different people. I'd suggest that our Rule
    Book have both styles of class tables.

    I have an Excel spreadsheet that will allow you to "play" with these formulas. It computes the classes for
    the above set of car models and does so for 4-9 classes. In other words, if you have a small Region and
    only have enough entries for 4 classes, the spreadsheet shows you the mix of cars in each of these 4
    classes. Or, in the case of a large Regions, who want 9 classes for their larger fields, the spreadsheet
    also does that. It will allow you to change the Span and Offset variables for any of these sets of classes
    and see what the results are. Have fun!

    Please remember that all this is just an example, not a finished product. It's an attempt to demonstrate
    a different paradigm...one that easily divides the set of car models into any number of classes, according
    to a fixed set of rules. To download this spreadsheet click here.

    I have displayed zero digits right of the class number in this spreadsheet (most people don't understand
    what class 4.62 is!). If you want to adjust the Span and Offset varibles, it's best to display 2 digits right of
    the decimal point...it lets you see what is happening much better.


    Can a single, common class formula produce different points for different "flavors"?

    The following is an extension of the above paradigm. The goal was to rank the cars via a points scheme
    consistent with Parade AX data and to see if it can be variable according to the type venue. I have
    arbritarily come up with the following 5 "flavors":

        1. Small Autocross
        2. Medium Autocross
        3. Giant Autocross
        4. Mini Time Trial
        5. Time Trial

    For this exercise, I have ignored the car configuration fudge factors, used in the previous formulas, but
    they could be added easily.

    The formula used in this spreadsheet is:

        Points = ((HP^A)*(HP/(Wt^B))*Span)+Offset

    The 2 exponents, A and B control the shape of the curve. The other 2 variables, Span and Offset make
    the curve go through specific points. In all of these "flavors", I have set the fastest car at 1000 points
    and the slowest car at approximately 850 points.

    This spreadsheet uses the same subset of cars used in the previous one.

          Small Autocross Medium Autocross Giant Autocross Mini Time Trial Time Trial
            A 0   A 0   A 0   A 0   A 1
            B 2   B 1.5   B 1.3   B 1   B 2
            S 7030000   S 148000   S 31700   S 3580   S 42800
            O 750   O 750   O 750   O 700   O 700
Year(s) Model Size Weight HP AX TT Points AX TT Points AX TT Points AX TT Points AX TT Points
1965-1968 912 1.6 2138 102 0.000022 1 907 0.0010 1 903 0.0048 1 902 0.048 1 871 0.000022 102 797
1969 912 1.6 2090 102 0.000023 1 914 0.0011 1 908 0.0049 1 906 0.049 1 875 0.000023 102 802
1976 912E 2.0 2557 86 0.000013 1 842 0.0007 1 848 0.0032 1 851 0.034 1 820 0.000013 86 748
Year(s) Model Size Weight HP                              
1970-1972 914 1.7 1984 80 0.000020 1 893 0.0009 1 884 0.0041 1 881 0.040 1 844 0.000020 80 770
1973 914 1.7 2138 72 0.000016 1 861 0.0007 1 858 0.0034 1 857 0.034 1 821 0.000016 72 749
1973 914 2.0 2138 95 0.000021 1 896 0.0010 1 892 0.0045 1 891 0.044 1 859 0.000021 95 785
1973 914 2.0 2138 100 0.000022 1 904 0.0010 1 900 0.0047 1 899 0.047 1 867 0.000022 100 794
1974 914 1.8 2138 76 0.000017 1 867 0.0008 1 864 0.0036 1 863 0.036 1 827 0.000017 76 754
1974 914 1.8 2138 85 0.000019 1 881 0.0009 1 877 0.0040 1 876 0.040 1 842 0.000019 85 768
1974 914 2.0 2138 95 0.000021 1 896 0.0010 1 892 0.0045 1 891 0.044 1 859 0.000021 95 785
1974 914 2.0 2138 100 0.000022 1 904 0.0010 1 900 0.0047 1 899 0.047 1 867 0.000022 100 794
1975 914 1.8 2205 76 0.000016 1 860 0.0007 1 859 0.0034 1 859 0.034 1 823 0.000016 76 751
1975 914 1.8 2205 85 0.000017 1 873 0.0008 1 871 0.0038 1 871 0.039 1 838 0.000017 85 764
1975 914 2.0 2205 88 0.000018 1 877 0.0008 1 876 0.0040 1 876 0.040 1 843 0.000018 88 768
1975 914 2.0 2205 100 0.000021 1 895 0.0010 1 893 0.0045 1 893 0.045 1 862 0.000021 100 788
1976 914 1.8 2205 85 0.000017 1 873 0.0008 1 871 0.0038 1 871 0.039 1 838 0.000017 85 764
1976 914 2.0 2205 88 0.000018 1 877 0.0008 1 876 0.0040 1 876 0.040 1 843 0.000018 88 768
1976 914 2.0 2205 100 0.000021 1 895 0.0010 1 893 0.0045 1 893 0.045 1 862 0.000021 100 788
1970-1972 914-6 2.0 2072 110 0.000026 1 930 0.0012 1 923 0.0054 1 920 0.053 1 890 0.000026 110 821
Year(s) Model Size Weight HP                              
1964-1967 911 2.0 2381 130 0.000023 1 911 0.0011 1 916 0.0053 1 918 0.055 1 895 0.000023 130 828
1967 911S 2.0 2381 160 0.000028 1 948 0.0014 1 954 0.0065 1 957 0.067 1 941 0.000028 160 893
1968 911L 2.0 2381 130 0.000023 1 911 0.0011 1 916 0.0053 1 918 0.055 1 895 0.000023 130 828
1969 911T 2.0 2249 110 0.000022 1 903 0.0010 1 903 0.0048 1 903 0.049 1 875 0.000022 110 802
1969 911E 2.0 2249 140 0.000028 1 945 0.0013 1 944 0.0061 1 945 0.062 1 923 0.000028 140 866
1969 911S 2.0 2249 170 0.000034 1 986 0.0016 1 986 0.0075 1 987 0.076 1 971 0.000034 170 945
1970-1971 911T 2.2 2249 125 0.000025 1 924 0.0012 1 923 0.0055 1 924 0.056 1 899 0.000025 125 832
1970-1971 911E 2.2 2249 155 0.000031 1 965 0.0015 1 965 0.0068 1 966 0.069 1 947 0.000031 155 903
1970-1971 911S 2.2 2249 180 0.000036 1 1000 0.0017 1 1000 0.0079 1 1000 0.080 1 987 0.000036 180 974
1972-1973 911T 2.4 2370 130 0.000023 1 913 0.0011 1 917 0.0053 1 919 0.055 1 896 0.000023 130 829
1972-1973 911E 2.4 2370 165 0.000029 1 957 0.0014 1 962 0.0068 1 964 0.070 1 949 0.000029 165 907
1972-1973 911S 2.4 2370 190 0.000034 1 988 0.0016 1 994 0.0078 1 997 0.080 1 987 0.000034 190 975
Year(s) Model Size Weight HP                              
1977-1982 924 2.0 2623 125 0.000018 1 878 0.0009 1 888 0.0045 1 892 0.048 1 871 0.000018 125 797
1977-1982 924 2.0 2623 95 0.000014 1 847 0.0007 1 855 0.0034 1 858 0.036 1 830 0.000014 95 756
1977-1982 924 2.0 2623 110 0.000016 1 862 0.0008 1 871 0.0040 1 875 0.042 1 850 0.000016 110 775
1988 924S 2.5 2734 160 0.000021 1 900 0.0011 1 916 0.0054 1 923 0.059 1 910 0.000021 160 847
1986-1987 924S 2.5 2734 150 0.000020 1 891 0.0010 1 905 0.0051 1 912 0.055 1 896 0.000020 150 829
1980-1982 924 Turbo 2.0 2822 156 0.000020 1 888 0.0010 1 904 0.0051 1 912 0.055 1 898 0.000020 156 831
1980-1982 924 Turbo 2.0 2822 177 0.000022 1 906 0.0012 1 925 0.0058 1 933 0.063 1 925 0.000022 177 868
Year(s) Model Size Weight HP                              
1993 RS America 3.6 2950 247 0.000028 1 950 0.0015 1 978 0.0076 1 992 0.084 1 1000 0.000028 247 1000


    Two types of classes and modification structures

    I've looked at quite a few sets of AX rules. There seem to be two basic types:

        One-dimensional
        Two-dimensional

    There are probably other descriptive names that could be used. In general, the one-dimensional
    schemes can represent all the classes in one column. Modifications "bump" cars down the list of
    classes. There may be modified classes for purpose-built race cars, but the "normal" cars do not
    "bump" into these.

    In contrast, the two-dimensional schemes can be represented in a 2-dimensional table. In general
    the rows represent the base car classes and the columns represent the level of modifications. Often
    the columns are called "Categories" and the rows are called "Classes".

    Here are simple examples:

    One-Dimensional Scheme
List of cars Class A
List of cars Class B
List of cars Class C
List of cars Class D
List of cars Class E
List of cars Class F
List of cars Class G
List of cars Class H
 
Every 10 points bumps you to the next higher letter class

    Two-Dimensional Scheme
  Points 0-10 11-20 21-30 31-UP
  Category Stock Improved Modified Race
List of cars Class A        
List of cars Class B        
List of cars Class C        
List of cars Class D        
List of cars Class E        

    Both of these schemes have advantages and disadvantages. The one-dimensional scheme is easier to
    understand, but with it, cars with a wide range of modifications compete against each other.
    The two-dimensional scheme is more complex, but with it, the modified cars of all levels
    compete in separate classes from the stock cars.

    There is a common variation of the two-dimensional scheme, where the categories to the right (higher
    Categories) have fewer classes...they simply combine several rows into a single class. Here is an
    example:

  Points 0-10 11-20 21-30 31-UP
  Category Stock Improved Modified Race
List of cars Class A        
List of cars Class B  
List of cars Class C    
List of cars Class D  
List of cars Class E      


    I've noticed that once we learn one of these schemes, it's difficult to get us to change to one of the others.
    So, which of these do you prefer...and why? Please be logical...not emotional.

    I've chosen to use points to represent the level of modifications. Some Regions choose to just allow
    or not allow specific mods in various Categories...they don't try to assign a value or weight to each
    modification, in an attempt to get parity. As an example, let's use tires. This hypothetical Region might
    only allow DOT tires with a UTQG Tread Wear rating over 100 in the Stock Category. In the Improved
    Category, they might allow only DOT tires, but allow them to have a UTQG Tread Wear rating less than
    100. In the Modified and Race Categories, they might allow any tire. They would do similar things with
    other types of modifications.

    I am trying to compare the various rules accessible on the "Links" page. This is proving difficult for
    several reasons:

        1. The names of the car models is variable. Some rules refer to models by the type number. Others
            refer to them by their US marketing name. Others use the common, slang name that most people
            know them by.

        2. Often the rules omit car models for some reason. So far, I have not found a single rule book that
            has a comprehensive list of all Porsche models.

        3. Some rules books include only the US models; others include the European and ROW cars also.

        4. The descriptions of modifications is variable. Sometimes I can't tell when they are the same.

        5. Some rules assign points to the modifications. Others just permit them or exclude them.

    These issues make a direct comparison of the classes and the modification schedules challenging.
    I could use help. Are there any "experts" out there that can help with these riddles?


    A List of Specifications for Porsche Cars

Porsche Cars USA Date: May 1, 2003.            
                     
YEAR MODEL Disp. type WEIGHT Net H.P. LBS/ HP C.R. TORQUE SPEED PRICE $$
1951 356 1488 502   55          
1952-1953 356-4 1488 527 1850 65 28.46 7.2   110 est $4,208.00
1953 1300   589              
1953 1300S   506              
1954 SUPER COUPE 1488 4 CYL. OHV 1860 70 26.57 8.2 79 107.6 $4,395.00
1955 1500s SPEEDSTER 1488 4 CYL. OHV 1675 84 19.94 8.2 79 104 $3,495.00
1956 CARRERA 1498 692/3 1918 110 17.44 8.7 87.5 120 $5,995.00
1955 550 Spyder 1498     110          
1957 550 SPYDER 1498 4 CYL. OHC 1510 137 11.02 9.5 95.5 122 $6,800.00
1957 1600 1582 616/1 1930 70 27.57 7.5 81 101.4 $3,790.00
1958 SUPER SPEEDSTER 1582 616/2 1790 88 20.34 8.5 86 105 $3,928.00
1959 1600D 1582 4 CYL. OHV 1900 70 27.14 7.5 86.2 98 $3,695.00
1960 SUPER 90 1582 4 CYL. OHV 1935 102 18.97 9.0 89 117 $4,195.00
1961 1600 1582 4 CYL. OHV 1980 70 28.29 7.5 81 100 $4,095.00
1962 CARRERA 2 1966 587 1863 155 12.02 9.5 131 122.7 $7,595.00
1963 904 1966 587/2             $7,425.00
1964 356C (1600C) 1582 616/15 2039 75 27.19 8.5 90 100 $4,295.00
1964 356C (1600SC) 1582 616/16 2039 95 21.46 8.5 90 115 $4,295.00
1964 904 (Carrera GTS) 1966 587/3 1350 180 7.50 9.8 145 150 $7,425.00
YEAR MODEL Disp. type WEIGHT Net H.P. LBS/ HP C.R. TORQUE SPEED PRICE $$
1964-1966 911 1991 6 CYL. OHC 2360 130 18.15 9.0 128 130 $6,500.00
1967 911S 1991 6 CYL. OHC 2360 160 14.75 9.8 132 141 $7,074.00
1965 906 (Carrera 6) 1995 6 CYL. OHC 1366 220 6.21 10.3 145   $11,500.00
1967-1968 911R 1991 6 CYL. OHC 1810 210 8.62 9.8 132    
1968 911L 1991   2420 130 18.62 9.0 128 130 $6,790.00
1965-1968 912 1582 616/36 2138 102 20.96 9.3 90 119 $4,700.00
1969 911T 1991 901/03 2250 110 20.45 8.6 116   $5,795.00
1969 911E 1991 901/09 2250 140 16.07 9.1 129 130 $6,995.00
1969 911S 1991 901/10 2250 170 13.24 9.8 134 140 $7,695.00
1969 912 1582 616/36 2138 102 20.96 9.3 90 119  
1970-1971 911T 2195 911/03 2361 125 18.89 8.6 130    
  911E 2195 911/01 2361 155 15.23 9.1 141    
  911S 2195 911/02 2361 180 13.12 9.9 147 143 $8,750.00
  911ST 2247 911/20 1848 230 8.03 10.3 170    
1972-1973 911T US. (MFI) 2341 911/51 2380 140 17.00 8.0 148   $7,960.00
  911T ROW (carbs) 2341 911/57 2380 130 18.31 7.5 144    
1973 1/2 911T (CIS) 2341 911/91 2380 140 17.00 8.0 148    
  911E 2341 911/52 2380 165 14.42 8.0 151   $8,960.00
  911S 2341 911/53 2380 190 12.53 8.5 158 143 $10,060.00
  911RS 2681 911/83 2365 210 11.26 8.5 188.4   $10,200.00
  911RS LT. WT. 2681 911/83 2116 210 10.08 8.5 188.4    
  911RSR 2808 911/72   308 0.00 10.3 217    
1976 912E 1971 GC 2557 86 29.73 7.6 98 110  
YEAR MODEL Disp. type WEIGHT Net H.P. LBS/ HP C.R. TORQUE SPEED PRICE $$
1974-1977 911 2687 911/92 2420 165 14.67 8.0 175 130  
  911S 2687 911/93 2420 175 13.83 8.5 167 140 $13,845.00
  911 RSR 2994 911/74   315 0.00 10.3 231    
  911 RSR 2994 911/75   310 0.00 10.1 231    
  911 RSR TURBO 2143 911/76   480 0.00 6.5 340    
  911 TURBO 2994 930/50 2630 260 10.12 6.5 253 152.9  
  911 CARRERA 2994 930/02 2600 200 13.00 8.5 188    
1978-1983 911SC 2994 930/04 2560 180 14.22 8.5 175   $19,500.00
  911TURBO 3299 930/61 2870 265 10.83 7.0 291 160 $36,700.00
1984-1985 911 CARRERA 3164 930/21 2670 207 12.90 9.5 192   $51,205.00
  911 CARR. RoW 3164 930/20 2670 231 11.56 10.3 209    
1986 911TURBO 3299 930/68 2940 282 10.43 7.0 287   $70,975.00
1986-1989 911 CARRERA 3164 930/21 2670 217 12.30 9.5 195    
  911 CARR. RoW 3164 930/20 2670 231 11.56 10.3 209    
  911TURBO 3299 930/68 2940 282 10.43 7.0 287    
  959 2851   3199 450 7.11 7.0 370 190 $247,000.00
YEAR MODEL Disp. type WEIGHT Net H.P. LBS/ HP C.R. TORQUE SPEED PRICE $$
1990-1994 CARRERA 2 3600 M64/01 2970 250 11.88 11.3 228   $64,990.00
  CARRERA 4 3600 M64/01   250 0.00 11.3 228   $77,050.00
  CARRERA 2 RS 3600 M64/01 2684 250 10.74 11.3 228    
  RS AMERICA 3600 M64/01 2954 250 11.82 11.3 228 162  
1990-1992 TURBO 3299 M30/69 3234 320 10.11 7.0 332    
1993-1994 TURBO 3600 M64/50 3600 360 10.00 7.5 383    
1995-1998 993 C2 3600 M64/01 3014 272 11.08 11.3 228 171 $63,750.00
  993 C4 3600 M64/01 3125 272 11.49 11.3 228   $69,100.00
  993 TURBO 3600 M64/60 3465 408 8.49 8.0 398 180 $105,000.00
  993 TURBO S 3600 M64/60 3465 424 8.17 8.0 400   $150,000.00
  993 GT2 3600 M64/60R   430   8.0      
  993 RS 3746 M64/70 2794 310 9.01 11.5 273    
  993 CUP 3746   2464 315 7.82        
1998-1999 996 3387 M96/01   300 0.00 11.3 258 174 $65,030.00
  CARRERA CUP GT3 3600 M96/75   360 0.00 11.3      
2000-2001 996 3596 M96/03 3014 320 9.42 11.3 274 178 $68,600.00
2002-2003 996 w/ X51 3596 M96/03 S   345 0.00 11.3 274 181  
  996 4S 3596 M96/03 3234 320 10.11 11.3 274    
2003 3.6 GT3 3600 M96/78 3043 381 7.99 11.7 285 190 $99,900.00
  996 turbo     3388 420   9.4   185 $116,200.00
  996 GT2       456       196 $181,700.00
                     
YEAR MODEL Disp. type WEIGHT Net H.P. LBS/ HP C.R. TORQUE SPEED PRICE $$
1970-1972 914 1679 W, EA 1984 76 26.11 8.2 99.5 108 $3,595.00
1973-1974 914 1679 EB 2139 69 31.00 7.3 87 104  
  914 1795 EC 2139 72 29.71 7.3 91 91  
  914 1971 GA 2139 91 23.51 7.6 105 115  
1975 914 1795 EC 2205 72 30.63 7.3 91 106  
1975-1976 914 1795 EC 2205 81 27.22 7.3 106 110  
  914 1971 GC 2205 84 26.25 7.6 103 111  
  914 1971 GB 2205 95 23.21 7.6 119 116  
1970-1972 914-6 1991 901/03 2195 110 19.95 8.6 116 123 $6,099.00
YEAR MODEL Disp. type WEIGHT Net H.P. LBS/ HP C.R. TORQUE SPEED PRICE $$
1978-1979 924 1984 XG,XE,VC 2612 110 23.75 9.0 111.3 120  
1980-1981 924 1984 XG,XE,VC 2612 95 27.49 9.0 105 114  
  924 1984 XG,XE,VC 2612 125 20.90 9.0 122 125  
1979-1980 924 TURBO 1984 M31/02 2779 143 19.43 7.5 175 135  
1981-1982 924 TURBO 1984 M31/04 2779 154 18.05 8.0 184.5 140  
1986-1988 924S 2479   2734 160 17.09 8.5 155 136  
1984-1988 944 2479 M44/02 2778 143 19.43 9.5 137.1    
1987-1988 944S 2479 M44/40 2886 188 15.35 10.9 170    
1989 944 2681 M44/11 2866 162 17.69 10.9 166    
1989-1991 944S2 2990 M44/41 2998 208 14.41 10.9 207    
1985-1986 944TURBO 2479 M44/51 2899 217 13.36 8.0 243    
1987-1988 944TURBO S 2479 M44/52 2998 247 12.14 8.0 258    
1989-1990 944TURBO S 2479 M44/52 3086 247 12.49 8.0 258    
YEAR MODEL Disp. type WEIGHT Net H.P. LBS/ HP C.R. TORQUE SPEED PRICE $$
1985-1986 928S 4957 M28/44 3351 288 11.64 10.0 302    
1987-1989 928S4 4957 M28/46 3505 316 11.09 10.0 316.9    
1989 928GT 4957 M28/47 3505 243 14.42 10.0 316.9    
1990-1991 928S4 4957 M28/42 3505 316 11.09 10.0 316.9    
  928GT 4957 M28/47 3505 326 10.75 10.0 316.9    
1992-1993 928GTS 5397 M28/50 3593 345 10.41 10.4 369    
YEAR MODEL Disp. type WEIGHT Net H.P. LBS/ HP C.R. TORQUE SPEED PRICE $$
1996-1997 BOXTER 2.5 6 CYL. OHC 2822 201 14.04 11.0 180   $39,500.00
1998-2003 BOXTER 2687 6 CYL. OHC 2805 225 12.47 11.0 192 157 $42,600.00
  BOXTER S 3179 6 CYL. OHC 2904 258 11.26 11.0 229 162 $51,600.00
2003 CAYENNE 4511 V8 OHC 4949 340 14.56 11.5 310 150  
2003 CAYENNE TURBO 4511 V8 OHC 5192 450 11.54 9.5 460 160