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Thread: Six speed manual transmission for 6G75?

  1. #11
    Formerly kj380 TreeAdeyMan's Avatar
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    Quote Originally Posted by TheBigM View Post
    Ok, did some serious googling. Found these as the specs for the 6 speed in the eclipse

    Thanks mate, much appreciated.

    By my calculations the 6 speed should do around 700rpm less than the 5 speed at 110km/h. Roughly 2,300rpm v 3,000rpm.

    The overall ratio for the stock 5 speed in 5th gear is 0.804 x 4.111 = 3.305, for the 6 speed it's 0.79 x 3.24 = 2.56.

    Thats a difference of .745 or 22.5% of the stock overall ratio.

    22.5% of 3,000rpm is 675rpm = reduction to 2,325rpm at 110km/h.

    That's a useful drop, but prolly still not worth $10,000!

    KJ.
    Now Mitsu-less for the first time in 29 years!

  2. #12

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    Quote Originally Posted by TreeAdeyMan View Post
    Thanks mate, much appreciated.

    By my calculations the 6 speed should do around 700rpm less than the 5 speed at 110km/h. Roughly 2,300rpm v 3,000rpm.

    The overall ratio for the stock 5 speed in 5th gear is 0.804 x 4.111 = 3.305, for the 6 speed it's 0.79 x 3.24 = 2.56.

    Thats a difference of .745 or 22.5% of the stock overall ratio.

    22.5% of 3,000rpm is 675rpm = reduction to 2,325rpm at 110km/h.

    That's a useful drop, but prolly still not worth $10,000!

    KJ.
    No problem!
    Just wondering if doing a conversion to a 3.5L Magna manual would be a better option? 5th is 0.761 and final is 3.722, so using your calcs, gives 2.83

  3. #13
    Foozrcool's Avatar
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    I reckon you could do it for $5K
    New ride - Lexus IS350 F Sport
    Old ride - Supercharged Mitsubishi 380

    See my new ride here!
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    AMC /// LEXUS

  4. #14
    Formerly kj380 TreeAdeyMan's Avatar
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    Quote Originally Posted by Disciple View Post
    That's a seriously short 6th gear ratio!
    Agreed, but when combined with the much taller final drive ratio in the 6 speed it's a 22.5% improvement over 5th gear in the stock box.

    Still can't figure out the MMAL logic behind a 4.111 final drive ratio in the stock 380 manual box.

    OK, it gives better acceleration through the gears, but what's the use when it means wheelspin city in first & second, and second & third wind out way too soon (90km/h and 130km/h in mine v 80km/h and 120km/h stock).

    KJ.
    Now Mitsu-less for the first time in 29 years!

  5. #15
    DOMO KUN!!!!!!!!!!!! Mecha-wombat's Avatar
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    Have a look at a Tiburon box

  6. #16
    Jasons VRX's Avatar
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    Fit a 3.5 manual magna final drive gear set to your 380 box. (easy to do if your getting a LSD fitted) Theres a certain IPR magna that has now had the magna diff ratio fitted into its 380 gearbox

    The 3.5 magna diff ratio is a bit taller and will make 3000rpm = 120kmh in 5th gear

  7. #17
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    Quote Originally Posted by Mecha-wombat View Post
    Have a look at a Tiburon box
    Tibby box is worse for economy (4.4 FD), mad for accelleration though. Was tempted but $1100 was a bit much.

  8. #18

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    serious suggestion,

    trade your car in on a auto 380, i doubt the swap over value would be more than 5k. then you will have the nice long ratio 5th gear for eco cruising.


    but where is the fun in that right?

  9. #19
    Formerly kj380 TreeAdeyMan's Avatar
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    Quote Originally Posted by to4garret View Post
    serious suggestion,

    trade your car in on a auto 380, i doubt the swap over value would be more than 5k. then you will have the nice long ratio 5th gear for eco cruising.


    but where is the fun in that right?
    Yep, that's why I bought a manual in the first place.

    I intend to keep this car for another 7 or 8 years and I have no desire to swap it for an auto.

    I've been looking at sourcing an LSD and the Magna final drive ratio for some time now, but then I thought a six speed (preferrably with LSD) would be nice and also something unique, I could recoup some of the cost over time with improved highway fuel economy, and maybe it wouldn't cost much more than Plan A.

    It now looks as though it would cost a lot more, so back to Plan A.

    Trouble is with Plan A I still haven't found out if a Quaife LSD will slot into a 380 manual 'box without major hassles (= $), as AFAICT no-one has tried it yet.

    KJ.
    Now Mitsu-less for the first time in 29 years!

  10. #20

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    Blackstar did it AFAIK
    Current - 2011 Renault Clio RS Cup Trophee

    My Magna LE - Sold

    /// Sydney Cyclists Division

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