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!!!sex!!!

This is a discussion on !!!sex!!! within the External Engine forums, part of the LSx Technical Help Section category; OK, now that I have your attention. I need your help. I have a 98 Trans am and have decided ...

  1. #1
    "When performance counts"
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    !!!sex!!!

    OK, now that I have your attention. I need your help. I have a 98 Trans am and have decided to get an MTI Lid, and Magnaflow catback exhaust. I want to add gears and a convertor next and hopefully that will be it. I could use some help with some questions seeing how I haven't raced this yet.

    1. What MPH should I expect with a stock A4 car with a 2.73 gear (I'm guessing 103ish??)
    2. More importantly, what rpm should I expect to go through the traps at? (really need a number here)
    3. What is the stock weight of these cars? (does 3450lbs sound close??)

    In case your wondering why those specific questions, I am trying to figure the best mechanical advantage on a stock car for a given horsepower. I should be able to figure out Horespower and approximate convertor/transmission efficiency from those questions based on my current gears. I will then pick out the best gear ratio and stall convertor. Thanks for yor help!
    Chris
    Last edited by tt69camaro; 06-01-2006 at 06:23 PM.

  2. #2
    Senior Member ss~zoso~ss's Avatar
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    SS: NBM, tan top
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    good way to get our attention, the MPH sounds right but i havent a clue about the rpm

  3. #3
    Member silverz28camaro's Avatar
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    sebring silver
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    my car is the 2000 a4 camaro with 2.73; only mod is slp cai, at gateway i ran 13.15 @107.88, just as before i cross the finish lint my car shifts into 3rd, i will have to recheck but i think it is about 4,000rmp, don't quote me there, i will get bake and let you know for shur. i was wanting to go with 3.73 with stock converter. do what you want but i also talked to a guy at gateway who had a converter on his 02, he was running 12.9 then when he installed the 3500 rpm conv. he was running 12.66(best)
    also he had to launch in second due to lose of traction but he did have stock wheels and stock rear end, i think he was having some rear diff noise after that night , so build your rear end stout im sure you know this, some company makes a 12 bolt in any gear, which i may go with

  4. #4
    "When performance counts"
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    Anyone know what the factory stall is?

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    Believe it's 1600-1800, 1.8 STR.
    A4(3.42)TA Cover/Nittos/Vig 3200/Corsa Catback/FTRA/BMR Boxed SFC, STB, ACLA, APHR/Predator Custom Tune...

  6. #6
    "When performance counts"
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    Yeah, that's got to hurt!

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    Member silverz28camaro's Avatar
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    sebring silver
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    yep i cross the line at about 4,200 rpm @ 106 mph. need lower gears get the 3.73

  8. #8
    "When performance counts"
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    I will go with either the 3.73 or 4.11. Thanks for your input!

  9. #9
    Member silverTA2002's Avatar
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    silver
    2002 Pontiac Trans Am

    Quote Originally Posted by tt69camaro
    I will go with either the 3.73 or 4.11. Thanks for your input!
    3.73 for an auto.

    Get a stall first, then gears.

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