Welcome to ZRoadster.org - BMW Z1 Z4 Z8 Z3 Forum and Technical Database

If you want to join in with the discussion, and see the areas which are available only to members then sign up now!

  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

2.8 exhaust manifold

Discussion in 'Z3 Roadster & Coupé' started by Kev Bennett, Jul 31, 2014.

  1. Kev Bennett

    Kev Bennett Dedicated Member
    Supporter

    Joined:
    Mar 1, 2014
    Messages:
    60
    Likes Received:
    19
    Trophy Points:
    31
    Location:
    Rugby,Warwickshire
    Model of Z:
    2.8 wideboy
    Can anybody advice me as today I have been told that if I change my exhaust manifold on my 2.8 for one from a e36 2.5 it will increase my bhp by around 20bhp as mine has restrictions on it ,can anyone confirm this and is it this easy to do ??
     
  2. GazHyde

    GazHyde The Gaz Monkey
    Staff Member Administrator Global Moderator British Zeds

    Joined:
    Dec 2, 2011
    Messages:
    15,105
    Likes Received:
    9,171
    Trophy Points:
    226
    Location:
    Newbury, Berkshire
    Model of Z:
    BMW Z4 3.0Si Sport
    @z3cade has done the manifold swap on his old 2.8, although not sure which one he swapped for what though. I'm sure he'll pop along in a bit now I've tagged him!
     
  3. Aceman

    Aceman Moderator
    British Zeds 3rd Party Trader

    Joined:
    Dec 5, 2011
    Messages:
    2,204
    Likes Received:
    707
    Trophy Points:
    156
    Location:
    Wakefield
    Model of Z:
    ///M Roadster
    It is the inlet manifold not the exhaust manifold that can be changed. Also do you have the single or twin vanos M52TU engine as the later will require the later M54 manifold off the 3.0 engine instead.

    Once done though coupled with a decent remap you can expect upto 230bhp but just be mindful of the work involved as I think I have seen Liam mention he wouldn't do it again.
     
  4. Kev Bennett

    Kev Bennett Dedicated Member
    Supporter

    Joined:
    Mar 1, 2014
    Messages:
    60
    Likes Received:
    19
    Trophy Points:
    31
    Location:
    Rugby,Warwickshire
    Model of Z:
    2.8 wideboy
    Thanks for that Aceman,I am not going to rush into this yet,may be a bit of a winter project,how do I find out if I have the single or twin vanos and you have made me think is it worth it as she is only a weekend/ summer car and I quick enough for what I want
    Kev
     
  5. t-tony

    t-tony Zorg Expert (I)
    Supporter British Zeds

    Joined:
    Dec 31, 2013
    Messages:
    30,190
    Likes Received:
    14,242
    Trophy Points:
    220
    Location:
    Torksey Lock,Lincoln, England
    Model of Z:
    Z4 3.0 Auto
    You need your engine type Kev, ie M52 etc. Then someone will have the info I'm sure.
     
  6. Aceman

    Aceman Moderator
    British Zeds 3rd Party Trader

    Joined:
    Dec 5, 2011
    Messages:
    2,204
    Likes Received:
    707
    Trophy Points:
    156
    Location:
    Wakefield
    Model of Z:
    ///M Roadster
    What's the build date on the drivers front suspension turret.?
     
    • Like Like x 1
  7. Aceman

    Aceman Moderator
    British Zeds 3rd Party Trader

    Joined:
    Dec 5, 2011
    Messages:
    2,204
    Likes Received:
    707
    Trophy Points:
    156
    Location:
    Wakefield
    Model of Z:
    ///M Roadster
    M52 single vanos as fitted to pre Oct 98 zeds, notice the circular bulge at the front of the rocker cover.

    image.jpg

    M52TU twin vanos engine as fitted to post Oct 98 zeds, notice smoother aspect to front of rocker cover.

    image.jpg
     
    • Like Like x 1
  8. Kev Bennett

    Kev Bennett Dedicated Member
    Supporter

    Joined:
    Mar 1, 2014
    Messages:
    60
    Likes Received:
    19
    Trophy Points:
    31
    Location:
    Rugby,Warwickshire
    Model of Z:
    2.8 wideboy
    Thanks Aceman for your help mine is a DEC 1998 twin vanos,so I have learnt something new today !!
     

    Attached Files:

    • Like Like x 2
    • Agree Agree x 1
  9. Aceman

    Aceman Moderator
    British Zeds 3rd Party Trader

    Joined:
    Dec 5, 2011
    Messages:
    2,204
    Likes Received:
    707
    Trophy Points:
    156
    Location:
    Wakefield
    Model of Z:
    ///M Roadster
    M50 manifold won't fit then so it will be the M54 one you will need plus a plumbing kit to connect it all together and then you have the decision of whether to fit a bigger throttle body too in which case I think you need adapter plates. All starts getting expensive when you can just swap it for a 3.0 which probably won't be much more expensive so does make you think is it worth it.
     
  10. Kev Bennett

    Kev Bennett Dedicated Member
    Supporter

    Joined:
    Mar 1, 2014
    Messages:
    60
    Likes Received:
    19
    Trophy Points:
    31
    Location:
    Rugby,Warwickshire
    Model of Z:
    2.8 wideboy
    Sounds like it is getting a bit complicated really Aceman,like I said I am quite happy with the performance of the 2.8 not sure I can be bothered with all that you have said,so is swapping the exhaust manifold not worth bothering with also,as I thought this would be a fairly simple and cheap improvement.Any way thanks for the advice it is very helpful
    Kev
     
  11. Aceman

    Aceman Moderator
    British Zeds 3rd Party Trader

    Joined:
    Dec 5, 2011
    Messages:
    2,204
    Likes Received:
    707
    Trophy Points:
    156
    Location:
    Wakefield
    Model of Z:
    ///M Roadster
    As far as I know there is no advantage swapping exhaust msnifold thing they are all pretty much the same.
     

Share This Page