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M6: 3.42 vs 3.73 differential

This is a discussion on M6: 3.42 vs 3.73 differential within the Drivetrain forums, part of the LSx Technical Help Section category; Originally Posted by tici we pay now 1.70 - 1.80 swiss francs per liter about 5.15 - 5.45 US$ per ...

  1. #21
    Senior Member Tobynine9's Avatar
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    Quote Originally Posted by tici
    we pay now 1.70 - 1.80 swiss francs per liter
    about 5.15 - 5.45 US$ per gallon

    so mileage DOES count...
    At least you're driving a cool car in Europe. I didn't see a single American-made car worth talking about during 9 months in France.

  2. #22
    SS#430 1 of 74 7camaro7's Avatar
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  3. #23
    Member tici's Avatar
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    1998 M6 vert TA

    Quote Originally Posted by GatorSS
    That is the reason I would go with the 3.42.


    Right now I still have 2.73 with the M6 and the mileage is worst than with the A4. It's consuming about 10% more fuel as before.

    I have a M6 program and the tuning is fine. Timing, fuel... really OK.
    Is it possible that with this ratio the engine is working in a sub-optimal RPM range?

    I really try to drive in a fuel-saving way but somehow it isn't enough.
    The only thing I can imagine it's that I seldom can shift in 6th (it needs at least 65 mph to use it).
    In 5th and at the same speed as with the A4 the engine is revving about 7% faster than in overdrive. Is this the cause of more fuel consumption?

  4. #24
    Senior Member MadSeason's Avatar
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    I believe it's because you're undergeared and using more throttle and fuel to get up to speed. Is your computer also setup for 2.73 gears? It could be making your speed and mileage off

  5. #25
    Member tici's Avatar
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    1998 M6 vert TA

    Yep, it's set at 2.73.
    I really think it's because I too often stay in 5th: I made a long trip on the highway in 6th and the mileage is much better.
    Those days I only drive home to office: few miles and low temperatures. This may also cause too much fuel consumption.
    It's also possible that because of the 2.73 I'm driving the car in a sub optimal RPM range.
    Soon I'll receive a set of 3.42 and see... I'll post the results.

  6. #26
    Silver SS in Germany
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    I have 3.42 gears and a 6 speed. I maxed out my speedo at about 5700RPMs in 5th. As long as I'm in Germany I'm going to keep the gears I have. I want 4.10 when I get back to the states and have to worry about speed limits.

  7. #27
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    The car I bought had a standard diff ratio of 3.46:1 and it wasn't enough. When I went to 3.91 I found I saved fuel because I could drive around the city in 4th and 5th gear a lot.

    Lets face it: If you can afford a SUPERCHARGED V8, why are you worrying about fuel economy.

    Trade it in on a 4 cylinder something-or-other and your problem is solved.

  8. #28
    Member tici's Avatar
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    1998 M6 vert TA

    Quote Originally Posted by drone14
    The car I bought had a standard diff ratio of 3.46:1 and it wasn't enough. When I went to 3.91 I found I saved fuel because I could drive around the city in 4th and 5th gear a lot.

    Lets face it: If you can afford a SUPERCHARGED V8, why are you worrying about fuel economy.

    Trade it in on a 4 cylinder something-or-other and your problem is solved.
    One point for you! I know, I shouldn't complain

    Silver SS in Germany you are about 400 km from here!
    Army? School?
    Do you have your US car or is it the European version?

  9. #29
    Silver SS in Germany
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    Quote Originally Posted by tici
    One point for you! I know, I shouldn't complain

    Silver SS in Germany you are about 400 km from here!
    Army? School?
    Do you have your US car or is it the European version?
    I'm in the Army. I have a US spec car. You should drive over here. There are 2 Z28's on this base, and a few other Z's and SS around the Weisbaden area.

  10. #30
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    Tici,

    I didn't mean to shoot you down at all, but in Australia we wouldn't ask that question because we would be laughed out of the forum.

    I don't know how fuel prices compare in Europe but I'm sure everyone is suffering from high prices.

    I think if you go 3.73 or higher you won't regret it.

    cheers,

    drone14

  11. #31
    Member tici's Avatar
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    1998 M6 vert TA

    Quote Originally Posted by Silver SS in Germany
    I'm in the Army. I have a US spec car. You should drive over here. There are 2 Z28's on this base, and a few other Z's and SS around the Weisbaden area.
    OK if it was in summer, but with the actual wheater... how long will you stay?


    drone 14 5.15 - 5.45 US$ per gallon.
    If I would use this car only during the weekend It wouldn't be a problem, but it's my daily drive and I almost cry every time I go to the gas station... $80 to fill the tank!
    About once a week...

  12. #32
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    That is a pretty high price!! I knew that Europe was suffering a lot more than us and the US but I didn't know that it was that high.

    I think 3.73 is a perfect match for the M6 in any fuel situation.

    SILVER SS: In Australia the army bases are prime areas for people to steal cars. How is it in Europe?

  13. #33
    Silver SS in Germany
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    I haven't heard of anyone getting a car stolen since I've been here.

  14. #34
    dubS6
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    Quote Originally Posted by drone14

    SILVER SS: In Australia the army bases are prime areas for people to steal cars. How is it in Europe?
    i would never steal a car from a place where people sleep next to there guns.

  15. #35
    Silver SS in Germany
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    Yeah but all of the guns are locked up. It would probably take about 10 minutes before we could get to them. If you don't have proper I.D. Then you are not getting on base.

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    I think the bases in Australia don't have the carpark security that exists over there, but that still doesn't explain why so many get taken.

    I would say that a lot of them are "inside jobs" to some degree.

  17. #37
    Super Sporting It Chevypowr's Avatar
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    Quote Originally Posted by hammertime
    When you change the rear axle gear, it changes the reduction ratio after the transmission, so all ratios are affected, not just the first gear.

    Also, keep in mind - all LS1 era T56's have a .50:1 6th gear. That means your 4.10 gears feel like a 2.05 in 6th.

    75 mph w/ 2.73's and .7:1 overdrive = 1875 rpm
    75 mph w/ 4.10's and .5:1 overdrive = 2010 rpm

    4.10's will give you much improved acceleration out of the hole for a whopping 135 rpm over a 2.73 A4 car.

    Go 4.10's!
    I do 70mph at 1500RPM with 3.42 M6. I have a richmond 3.73 set waiting to be installed. can't wait.

    I shift out of 5th gear at 6000rpms at 140mph drops to like 3500rpms in 6th (about don't quote me, i try to keep my eyes on the road )

  18. #38
    Super Sporting It Chevypowr's Avatar
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    Exclamation dif

    Oh and what posi traction dif should i go with? I have the stock auburn but its going, and i'm looking to upgrade.
    Last edited by Chevypowr; 11-27-2006 at 11:11 AM.
    Borla XR-1 energy bushings UMI B&M Spohn suspension techniques eibach edelbroc K&N Richmond Eaton F.A.S.T FlashTuner NGK MSD SLP J&M - I owe it all to my mentor- my dad.

  19. #39
    Silver SS in Germany
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    Quote Originally Posted by Chevypowr
    I do 70mph at 1500RPM with 3.42 M6. I have a richmond 3.73 set waiting to be installed. can't wait.

    I shift out of 5th gear at 6000rpms at 140mph drops to like 3500rpms in 6th (about don't quote me, i try to keep my eyes on the road )
    How are you maxing 5th gear at 140mph? We have the same trans and rear gear? I have never seen 6000 RPM in 5th.

  20. #40
    Member tici's Avatar
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    1998 M6 vert TA

    6000 rpm in 5th is about 180 mph...
    I feel my convertible falling apart at 150 mph!

    Silver SS: how long will you stay in Germany? Sorry but I don't know how your army stuff works... are you all professional? Is it like a job with a contract? Can you choose to go somewhere like in Germany or they just send you where they need troups?

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