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Thread: changein gears
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07-11-2008, 09:32 PM #1
- Join Date
- Jun 2008
- Location
- sheldon
- Posts
- 24
white- 2000 z28
changein gears
anyone have a ls1 with an A4 and 3:42's? what kind of millege you get?
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07-11-2008, 09:38 PM #2
- Join Date
- Feb 2007
- Location
- San Diego, CA
- Posts
- 5,823
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.
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07-11-2008, 09:50 PM #3
- Join Date
- Jun 2008
- Location
- sheldon
- Posts
- 24
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
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07-12-2008, 07:52 AM #4
i lost about 2mpg going to 373's from 2.73's
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07-12-2008, 10:29 AM #5
- Join Date
- Jul 2005
- Location
- Jacksonville, FL
- Posts
- 2,723
You won't lose that much:
2.73 at 76 = 1900
3.42 at 73 = 2300A4(3.42)TA Cover/Nittos/Vig 3200/Corsa Catback/FTRA/BMR Boxed SFC, STB, ACLA, APHR/Predator Custom Tune...
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07-12-2008, 01:24 PM #6
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
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07-13-2008, 07:48 AM #7
- Join Date
- Apr 2007
- Location
- Newport, RI
- Posts
- 1,552
Navy Blue Metallic- '00 Formy A4
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07-14-2008, 07:48 AM #8
- Join Date
- Jun 2008
- Location
- Euclid,ohio
- Posts
- 197
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.
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07-14-2008, 09:12 AM #9
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 ?
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07-14-2008, 12:02 PM #10
- Join Date
- Jun 2008
- Location
- Euclid,ohio
- Posts
- 197
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.
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07-14-2008, 01:48 PM #11
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...
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07-14-2008, 03:44 PM #12
- Join Date
- Dec 2006
- Location
- Parkton MD
- Age
- 59
- Posts
- 138
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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