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11-05-2009, 01:17 PM
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#1
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Join Date: Oct 2009
Posts: 443
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MPG and Gears question.
Plans are to put in 3.73 gears and a True Trac LSD (torsen) in my 98 Bird. Right now with the 3.08 gears I average 27 mpg doing a lot of highway commuting. The car is stock with an automatic trans.
Wondering how the 3.73's will affect the mpg?
Can you guys post your MPG and gears? (and I don't mean mpg while drifting  )
Thanks!
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11-05-2009, 01:59 PM
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#2
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,938
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Like 10-12.... 3.73s/3400 stall. LOL
__________________
Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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11-05-2009, 02:17 PM
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#3
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The Mayor / 2009 Member of the Year / Moderator
Join Date: Jan 2005
Location: Northwest
Posts: 8,869
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3.23s, not even a full bolton lt1 A4
18-23 but never seen a full tank of highway
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1995 Z28 Convertible A4 13.78 @ 100 (CAI, high flow cat, catback, 160 thermo, hypertech, Strano springs, Koni yellows, sway bars, 3 pt. UMI SFC)
2018 Sea Doo GTX - 3 cylinders and das boooooost
Quote:
Originally Posted by BonzoHansen
Is English your 2nd language? Did you graduate high school? Your posts make my head hurt.
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 Team FARM 
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11-05-2009, 05:31 PM
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#4
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Join Date: Oct 2009
Posts: 443
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Hmmm. Something tells me you guys don't do much highway. I would also gander that you got a heavy right foot. 
Any commuters out there that eat up some highway?
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11-05-2009, 06:01 PM
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#5
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,368
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how do you have 3.08's?
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11-05-2009, 06:23 PM
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#6
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Join Date: Oct 2009
Posts: 443
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Quote:
Originally Posted by sweetbmxrider
how do you have 3.08's?
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Thats what came in the Firebird Coupe in 98 without any performance handling options.
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11-05-2009, 06:41 PM
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#7
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,368
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not to wander off topic too much but, 2.73's, 3.23's, and 3.42's were the f-body gear choices from the factory
Last edited by sweetbmxrider; 11-05-2009 at 06:42 PM.
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11-05-2009, 07:10 PM
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#8
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11 second club / Moderator
Join Date: Aug 2004
Location: West Berlin, NJ
Posts: 7,148
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I know that my 91 305/T5 bird had 3.08's.
Maybe since he has a V6, they put 3.08s in them?
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2001 Trans Am WS6 •SLP Loudmouth II •UMI Suspension •12.857 @ 109.57
1996 Trans Am WS6 •Pacesetter Longtubes •Strange 12 Bolt •Spohn Suspension •11.152 @ 123.85
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11-05-2009, 07:22 PM
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#9
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,368
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i dono, i dono anything really anymore 
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11-05-2009, 09:05 PM
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#10
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Power Member/NJFBOA Bookie/Moderator
Join Date: Jun 2009
Location: North Jersey = Best Jersey.
Posts: 4,435
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subbing. I'm getting about 18mpg city/highway with a bolt-on LS1 & 2.73s.. thinking of upping to 3.73s. Wonder how the tank will take it.
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11-05-2009, 09:07 PM
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#11
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,938
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I think its more of your stall that will kill your MPG than gears. If you don't nail it off every line that is.
__________________
Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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11-05-2009, 09:25 PM
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#12
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The Mayor / 2009 Member of the Year / Moderator
Join Date: Jan 2005
Location: Northwest
Posts: 8,869
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Quote:
Originally Posted by Mark42
Hmmm. Something tells me you guys don't do much highway. I would also gander that you got a heavy right foot. |
What's a highway?
The 24 was on like 2/3 of a tank of highway, but that included some messing around as well, plus the rest was around my area with hills and such.
__________________
1995 Z28 Convertible A4 13.78 @ 100 (CAI, high flow cat, catback, 160 thermo, hypertech, Strano springs, Koni yellows, sway bars, 3 pt. UMI SFC)
2018 Sea Doo GTX - 3 cylinders and das boooooost
Quote:
Originally Posted by BonzoHansen
Is English your 2nd language? Did you graduate high school? Your posts make my head hurt.
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Team FARM
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11-07-2009, 01:30 PM
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#13
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Join Date: Oct 2009
Posts: 443
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Don't you commute to school? Ya know that wide road near your house that is always under construction? (I think they call it RT80??)
My 96 Camaro w/5 spd averaged high 20's if I remember right. Hope the 3.73's don't kill it much.
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11-07-2009, 08:22 PM
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#14
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The Mayor / 2009 Member of the Year / Moderator
Join Date: Jan 2005
Location: Northwest
Posts: 8,869
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Quote:
Originally Posted by Mark42
Don't you commute to school? Ya know that wide road near your house that is always under construction? (I think they call it RT80??)
My 96 Camaro w/5 spd averaged high 20's if I remember right. Hope the 3.73's don't kill it much. |
That I do, but I rarely take Rt. 80, between traffic and construction it could take as little as 45 min or as much as 2.5 hours. I stick with backroads through Morristown, then Rt. 510 right to Seton Hall. And besides, Camaro has never been to school, only the Explorer...
__________________
1995 Z28 Convertible A4 13.78 @ 100 (CAI, high flow cat, catback, 160 thermo, hypertech, Strano springs, Koni yellows, sway bars, 3 pt. UMI SFC)
2018 Sea Doo GTX - 3 cylinders and das boooooost
Quote:
Originally Posted by BonzoHansen
Is English your 2nd language? Did you graduate high school? Your posts make my head hurt.
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Team FARM
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11-07-2009, 09:47 PM
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#15
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Co-Founder / Site Admin
Join Date: Jul 2004
Location: Ewing, NJ
Posts: 22,476
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Can't speak from personal experience, but from what I have seen on the v6 forums and with friends with 3.8 F-bodies, the 3.73s will likely hurt your highway mileage a bit, but as long as you keep your foot off the skinny pedal, you should see an increase in around town mileage.
Quote:
Originally Posted by sweetbmxrider
how do you have 3.08's?
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3.08s were factory gears for a 3.8 / A4 without the performance package (which added 3.42s and a posi for auto cars, and just a posi to the stock 3.23s for M5 cars, as well as dual exhaust tips).
Quote:
Originally Posted by sweetbmxrider
not to wander off topic too much but, 2.73's, 3.23's, and 3.42's were the f-body gear choices from the factory
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These are the only 4th gen v8 gears offered from the factory.....v6s (and 3rd gens) got different options.
- Justin
__________________
1999 Camry - Beigemobile DD
2002 Suburban - Wife's DD
2004 Grand Cherokee - Not running / Project / Selling?
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11-08-2009, 11:18 AM
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#16
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,368
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yeah i didn't notice it was a v6 till it was mentioned
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11-08-2009, 11:26 AM
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#17
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Stalker
Join Date: Aug 2004
Posts: 12,082
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'01 SS(decently modded...cammed, bolt ons)... 29 mpg highway(M6).... 3.42s
I can easily go 350 miles highway, upstate NY to NJ, on a full tank and have some left over for the next day.
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11-08-2009, 11:56 AM
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#18
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Sliderule / Moderator
Join Date: Oct 2004
Location: Catawissa PA
Posts: 2,294
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I'll guess you are going to loose about 5 MPG on the highway.
With my heads/cam LT1 = With 3:23 I was about 24MPG on long runs, with 3:42s I pickeed up a bit, around 26. With 3:73s I dropped to 20.
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93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada
1) Build it
2) Race it
3) Break it
4) Repeat!!!
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11-09-2009, 09:24 PM
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#19
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12 Second Club
Join Date: Aug 2004
Location: West Milford
Posts: 8,373
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ls1, intake, TB and catback, A4, went from 2:73's and no tune, swapped to 3:42's and a tune and now i get 15mpg with a very heavy foot and no highway, previously was in the 13mpg range with 2:73's and no tune 
my old LT1 was in the 15mpg range with the 2:73's and a tune wen i didnt push it to hard
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