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Thread: FWD vs RWD: Adders, Subtractors, and Weight, Oh my...!

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  1. #1
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    Mar 2008
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    Quote Originally Posted by ekim952522000 View Post
    So Lapsim seems to indicate the higher the weight, horsepower, and grip get, the larger the percent of weight that needs to come off in order to balance FWD and RWD.

    <----Why do I have a FWD car again......
    Because even at it's current weight, i bet that sucker will do a 2:00:xx at T-hill USING the crows nest!!!! ITR has a lot of growing room!!

    After seeing what a ITR ITR can do on toyo's and 7 inch rims...

  2. #2
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    Quote Originally Posted by jimmyc View Post
    Because even at it's current weight, i bet that sucker will do a 2:00:xx at T-hill USING the crows nest!!!! ITR has a lot of growing room!!

    After seeing what a ITR ITR can do on toyo's and 7 inch rims...
    Come out to ITR and prove it! Color me very skeptical.

    - Josh "still in the 2:05s in my ITR BMW" Sirota
    Josh Sirota
    ITR '99 BMW Z3 Coupe

  3. #3
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    Quote Originally Posted by JoshS View Post
    Come out to ITR and prove it! Color me very skeptical.

    - Josh "still in the 2:05s in my ITR BMW" Sirota

    the ITA track recored is a 2:05:876.....

    and SMC is a 2:05:317........
    Last edited by jimmyc; 04-28-2009 at 06:10 PM.

  4. #4
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    Chris-

    it goes like this:stock hp x IT factor x class factor = base weight
    (Borgward Special: 160hp * 1.25 = 200 * 12.9 = 2580 base weight).
    base weight * percentage = adder. (2580 x5.56% = 142.)
    So the Borgward, barring any other adders would weigh 2438

    other adders come off that number, or get added to that number.


    Clearer?
    Jake Gulick


    CarriageHouse Motorsports
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  5. #5
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    Thanks Jake. It is applied as a % on the individual car's process weight (for all factors except driveline type). This is a good evolutionary step.
    Chris Schaafsma
    Golf 2 HProd

    AMT Racing Engines - DIYAutoTune.com

  6. #6
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    Quote Originally Posted by shwah View Post
    Thanks Jake. It is applied as a % on the individual car's process weight (for all factors except driveline type). This is a good evolutionary step.
    We think so. We like that it is based in real world science, and that it is more granular, and it is very repeatable.

    It's taken some work, but these are the kinds of thing s we've been cooking. I consider it "The Process 2.0". It is attempting to fine tune what was already a good thing, remove either real subjectivity or the appearance of subjectivity, increase consistency, and make it more robust going forward.

    More to come.
    Jake Gulick


    CarriageHouse Motorsports
    for sale: 2003 Audi A4 Quattro, clean, serviced, dark green, auto, sunroof, tan leather with 75K miles.
    IT-7 #57 RX-7 race car
    Porsche 1973 911E street/fun car
    BMW 2003 M3 cab, sun car.
    GMC Sierra Tow Vehicle
    New England Region
    lateapex911(at)gmail(dot)com


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