E36 320I coupé. Gear box upgrade's
Results 1 to 9 of 9
  1. #1
    BFI Senior
    SnowmanE36's Avatar
    Join Date
    Apr 2012
    Location
    Bristol
    Posts
    372
    Car Specs:
    Year
    1994
    Model
    Discovery
    Engine
    3.9l V8I
    Fuel
    Petrol
    Thanks
    39
    Thanked 122 Times in 85 Posts


    Donate Please click the
    image to support
    BMWForums.info
    Click Here To Contribute To Our Site

    E36 320I coupé. Gear box upgrade's

    I got the chance to meet up with a mate to get my engine a good once over before I even attempt to come to santa pod and managed to get out on an old airfield, Pushed her a bit and topped out in 5th a little too easy so I'm thinking is there an upgrade I can do to add more top end speed, I'e new gearbox/diff or will I just bollocks the whole car up?
    Cheers in advance for all replies and help!

  2. #2
    BFI Veteran
    Prince's Avatar
    Join Date
    Apr 2012
    Location
    Northampton
    Posts
    2,657
    Car Specs:
    Year
    1998
    Model
    E36 M3 Evo
    Engine
    3.2
    Fuel
    Petrol
    Thanks
    981
    Thanked 2,012 Times in 1,381 Posts


    You can change the LSD/diff for a lower ratio one, but then it will affect your acceleration. Personally I'd rather have acceleration over top end.

  3. #3
    BFI Senior
    SnowmanE36's Avatar
    Join Date
    Apr 2012
    Location
    Bristol
    Posts
    372
    Car Specs:
    Year
    1994
    Model
    Discovery
    Engine
    3.9l V8I
    Fuel
    Petrol
    Thanks
    39
    Thanked 122 Times in 85 Posts


    It pulls so well I was hoping to change gearbox for a 6 speed as that would allow me to maintain acceleration. But lsd is always an option would you know of a rear diff that would fit?

  4. #4
    BFI Veteran
    Prince's Avatar
    Join Date
    Apr 2012
    Location
    Northampton
    Posts
    2,657
    Car Specs:
    Year
    1998
    Model
    E36 M3 Evo
    Engine
    3.2
    Fuel
    Petrol
    Thanks
    981
    Thanked 2,012 Times in 1,381 Posts


    Quote Originally Posted by SnowmanE36 View Post
    It pulls so well I was hoping to change gearbox for a 6 speed as that would allow me to maintain acceleration. But lsd is always an option would you know of a rear diff that would fit?
    I don't think a 6 speed would work because you wouldn't get to a high enough speed to use 6th. I don't know the gear ratio the 320 uses or whether it uses a small or medium case diff. Small case LSDs are rare as fuck though so ideally a medium case would have to be used.

  5. #5
    BFI Senior
    SnowmanE36's Avatar
    Join Date
    Apr 2012
    Location
    Bristol
    Posts
    372
    Car Specs:
    Year
    1994
    Model
    Discovery
    Engine
    3.9l V8I
    Fuel
    Petrol
    Thanks
    39
    Thanked 122 Times in 85 Posts


    Quote Originally Posted by Prince View Post
    I don't know the gear ratio the 320 uses or whether it uses a small or medium case diff
    I am lifting her arse up tomorrow any-way where would I find the part number on a rear diff?

  6. #6
    BFI Veteran
    Prince's Avatar
    Join Date
    Apr 2012
    Location
    Northampton
    Posts
    2,657
    Car Specs:
    Year
    1998
    Model
    E36 M3 Evo
    Engine
    3.2
    Fuel
    Petrol
    Thanks
    981
    Thanked 2,012 Times in 1,381 Posts


    Quote Originally Posted by SnowmanE36 View Post
    I am lifting her arse up tomorrow any-way where would I find the part number on a rear diff?
    I honestly don't know. But after some research I can confirm the 320 uses a small case diff (same as the 316/318s) and I've also found this list of ratios (although can't confirm how accurate it is):

    BMW E36 Differential Ratio (Europe)
    Type 168 casing
    316i manual 3.23 & 3.45
    316i auto 4.44
    318i manual 3.45
    318i auto 4.44
    318is manual 3.45
    318is auto 4.44
    320i both 3.46
    Type 188 casing
    323i manual 2.93
    323i auto 3.64
    325i both 3.15
    328i manual 2.93
    328i auto 3.07
    M3 3.0 manual 3.15
    Type 210 casing
    M3 Evo manual 3.23

    The lower the number, the slower the acceleration but the higher the top end. That also means the higher the number the quicker the acceleration but the lower the top end.

    If you really wanto sacrifice some acceleration for top end then a 316 diff with a 3.23 ratio would be the easiest swap. Why do you want to increase the top end though? How often do you drive at 120mph?

  7. #7

    MclubSport's Avatar
    Join Date
    Oct 2013
    Location
    Bucharest Romania
    Posts
    3
    Car Specs:
    Year
    1993
    Model
    E36 325i
    Engine
    M50B25
    Fuel
    Petrol
    Thanks
    0
    Thanked 0 Times in 0 Posts


    cheap alternative is to change the differential

  8. #8
    Eat my soot !
    BFI Hero
    E36 TDS's Avatar
    Join Date
    Apr 2012
    Location
    Oxford
    Posts
    1,066
    Car Specs:
    Year
    1997
    Model
    E36 Touring
    Engine
    325 TDS
    Fuel
    Costs too much !
    Thanks
    2,465
    Thanked 613 Times in 493 Posts


    Quote Originally Posted by Prince View Post
    You can change the LSD/diff for a lower ratio one, but then it will affect your acceleration. Personally I'd rather have acceleration over top end.
    +1

  9. #9
    BFI Hero
    Dann's Avatar
    Join Date
    Apr 2013
    Location
    Portsmouth
    Posts
    1,753
    Car Specs:
    Year
    1998
    Model
    E90 335i
    Engine
    N54 3.0 Twin Turbo
    Fuel
    Petrol
    Thanks
    205
    Thanked 795 Times in 632 Posts


    In the real world acceleration will be more usable.
    The only time I would want higher top end would be for a long distance cruiser.

User Tag List

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •