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changein gears

This is a discussion on changein gears within the Drivetrain forums, part of the LSx Technical Help Section category; anyone have a ls1 with an A4 and 3:42's? what kind of millege you get?...

  1. #1
    Junior Member
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    white
    2000 z28

    changein gears

    anyone have a ls1 with an A4 and 3:42's? what kind of millege you get?

  2. #2
    Exalted Cyclops 67CamaroRSSS's Avatar
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    2002 Z28 A4 NBM
    Sadly now demodded :(

    A4 with 3.73's. I get ~ 14 mpg/city but I get ~25 mpg/hiway if I stay under 75 mph (about 2800 rpm). Much beyond that and it drinks gas like a drunken sailor consumes alcohol when he's on shore leave.

  3. #3
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    white
    2000 z28

    well right now i got 273's and get 24 and up doin 75 -80 1900-2100 rpms just wonderin what kind of hit i'm goin to take at the pump

  4. #4
    Member 35thz28camaro's Avatar
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    2002 z28 camaro

    i lost about 2mpg going to 373's from 2.73's

  5. #5
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    You won't lose that much:

    2.73 at 76 = 1900
    3.42 at 73 = 2300
    A4(3.42)TA Cover/Nittos/Vig 3200/Corsa Catback/FTRA/BMR Boxed SFC, STB, ACLA, APHR/Predator Custom Tune...

  6. #6
    Member txz28's Avatar
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    dirty aka white
    2000 Z

    thanks guys now i just hope this rear end dosent have Traction control bs and i'm in like flint other wise its back to the drawling board lol

  7. #7
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    Navy Blue Metallic
    '00 Formy A4

    Quote Originally Posted by txz28 View Post
    thanks guys now i just hope this rear end dosent have Traction control bs and i'm in like flint other wise its back to the drawling board lol

    Hey post your results when you do this, I want to know how you make out. I have 2.73's and want to do the same thing, but like you I'm concerned about the mileage.

  8. #8
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    Black
    1998 Z28

    Are you asking about city mileage or freeway mileage?
    I went from A4 3.23:1 to A4 4.56:1.
    Around town MPG decreased as it's 'more fun' now.
    Freeway MPG didn't drop as much as I was expecting.
    With the 3.23s' on 8 trips to Florida from Ohio,I would get 24.5 flowing with traffic,25.5 observing the speed limits,and 26.5 driving purposely 5 MPH under the limits(as a test).
    With the 4.56s' on a trip to Florida,yeah I went from Ohio to Florida to Ohio with 4.56s',I got 21.5 flowing with traffic(cruise control at 3100 RPM) and 21.9 observing the speed limits.MPG,based on mechanical change should have been in the 17-18 range.

  9. #9
    Member Z ROADSTER's Avatar
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    PEWTER
    2002 Z/28 VERT.

    Hell , thats simple . Just figure on between 2~3 MPG less .
    Now , is that gonna be worth 2 or 3 lengths in the Qtr. mile ?

  10. #10
    Member
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    Black
    1998 Z28

    Are you asking about city mileage or freeway mileage?
    I went from A4 3.23:1 to A4 4.56:1.
    Around town MPG decreased as it's 'more fun' now.
    Freeway MPG didn't drop as much as I was expecting.
    With the 3.23s' on 8 trips to Florida from Ohio,I would get 24.5 flowing with traffic,25.5 observing the speed limits,and 26.5 driving purposely 5 MPH under the limits(as a test).
    With the 4.56s' on a trip to Florida,yeah I went from Ohio to Florida to Ohio with 4.56s',I got 21.5 flowing with traffic(cruise control at 3100 RPM) and 21.9 observing the speed limits.MPG,based on mechanical change should have been in the 17-18 range.

  11. #11
    Veteran Hi-Po's Avatar
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    Black
    1999 TA WS.6

    I get 14 MPG's around town with my 3.73's in my M6.
    370 CI - Twin 6766 Turbo - Jakes stage 5 4L80E - MWC 9" - Holley Dominator

    Build in progress...

  12. #12
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    NBM
    2002 Z28

    24mpg at 65mph, driving it easy. 3400 converter, 228r cam. A 9'' is on the way with 3.70`s.

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