changein gears

[z28fromsheldon]

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

[67CamaroRSSS]

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.

[z28fromsheldon]

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

[35thz28camaro]

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

[2001NBMZ28]

You won't lose that much:

2.73 at 76 = 1900
3.42 at 73 = 2300

[txz28]

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

[StuntmanMike]

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.

[oldmanZ28]

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.

[Z ROADSTER]

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 ?

[oldmanZ28]

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.

[Hi-Po]

I get 14 MPG's around town with my 3.73's in my M6.

[Jumper]

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