RTAB's

Discussion in 'E46 M3 (2001-2006)' started by zeta4, Feb 9, 2018.

  1. 9 Feb 2018 at 1:56 PM #1
    zeta4

    zeta4 Achieved official socks

    Joined:
    May 6, 2015
    Messages:
    1,543
    Likes Received:
    0
    Trophy Points:
    36
    Your Motor:
    2003 E46 M3, E90 330d
    Colour Combo:
    Silver Grey/Black
    Im going to replace the RTAB's on my car next week as the cars done 100K and
    I dont think they have ever been changed.

    Just going for oem not poly so ordered some Lemforder ones from ECP.

    They came as Lemforder p/n 27191 01 and BMW p/n 33326770786. Realoem quotes the p/n for the
    M3 as 33326770817 so Im worried I might have the wrong ones.

    So looked in the Lemforder catalogue and it quotes 2 p/n's for the M3
    27191 01 and 35038 01. So on the face of it its right but does anyone know
    why Lemforder quote two. Is one better than the other ?

    Im probably being a bit OCD but Ive had the wrong parts before
     
  2. 9 Feb 2018 at 1:59 PM #2
    Stu78

    Stu78 Achieved official socks

    Joined:
    Feb 21, 2015
    Messages:
    3,607
    Likes Received:
    0
    Trophy Points:
    36
    Your Motor:
    M3
    I have a brand new set of Meyle mate I’m about to put up and sell?

    I can send you pics. Drop me a PM :thumbsup:
     
  3. 9 Feb 2018 at 2:28 PM #3
    zeta4

    zeta4 Achieved official socks

    Joined:
    May 6, 2015
    Messages:
    1,543
    Likes Received:
    0
    Trophy Points:
    36
    Your Motor:
    2003 E46 M3, E90 330d
    Colour Combo:
    Silver Grey/Black
    Thanks for the offer but Ive already got the Lemforders !
     
  4. 9 Feb 2018 at 3:10 PM #4
    Rob043

    Rob043 Achieved official socks

    Joined:
    Aug 19, 2015
    Messages:
    1,561
    Likes Received:
    0
    Trophy Points:
    36
    Your Motor:
    E46 M3
    Colour Combo:
    Carbon Black/Imola Red
    I think there was perhaps a revision on them. Some looked different to others when I was looking but I forget the detail.

    Is the M3 part number(s) different from a regular 3 series?

    I don't imagine there is anything special about them. Mind and set the support cradle level with the axle when you tighten it back up with the through bolt (before re mounting the cradle in the shell with its 3 bolts). Thus ensuring no preload on the bush. I found a slim 2ft piece of timber served nicely for this. I had a fight getting the old ones in out as well. Butchery was required!
     
  5. 9 Feb 2018 at 3:18 PM #5
    zeta4

    zeta4 Achieved official socks

    Joined:
    May 6, 2015
    Messages:
    1,543
    Likes Received:
    0
    Trophy Points:
    36
    Your Motor:
    2003 E46 M3, E90 330d
    Colour Combo:
    Silver Grey/Black
    It seems that both RTAB's will fit but the p/n given in Realoem 33326770817 is for a later reinforced one for the M3. Mister Auto show both but ECP do not. Neither say why there are two p/n's. To save time Ive ordered the correct ones from my local dealer. Price was quite good.

    So if anyone is about to change their RTAB's use the correct p/n.

    ps Just seen your post. The M3 RTAB seems to have wider slots in the outer bush so I think when it is compressed it clamps the rubber
    bush tighter or something like that. Luckily my friendly indie is doing it for me along with a few other bits.
     
    Last edited: Feb 9, 2018
  6. 9 Feb 2018 at 3:43 PM #6
    m3rosco

    m3rosco Achieved official socks

    Joined:
    Dec 28, 2008
    Messages:
    4,831
    Likes Received:
    1
    Trophy Points:
    38
    Your Motor:
    E46 M3 ESS VT2-525
    Colour Combo:
    phoenix yellow / black
    As said above I’m sure they revised the design and one part number superseded the other one. I think the difference is the outer metal part. One version is solid all the way round and the other one is split in two halves. Not sure which is the latest version though.
     
  7. 9 Feb 2018 at 5:19 PM #7
    zeta4

    zeta4 Achieved official socks

    Joined:
    May 6, 2015
    Messages:
    1,543
    Likes Received:
    0
    Trophy Points:
    36
    Your Motor:
    2003 E46 M3, E90 330d
    Colour Combo:
    Silver Grey/Black
    Ill know tomorrow when I pick up the oem ones from BMW. In realoem it doesnt say that the M3 specified one replaces the one I got from ECP.
    They seem to be for two separate applications.

    The ones Ive got from ECP have two slits in the outer cylinder. From photo's it seems that the M3 specified ones look different with a wider slot.
    As I said Ill be able to compare them tomorrow. If they are significantly different Ill try to post some photo's

    I do know that these two replaced an earlier design with a flange. I had these in the E36 M3.

    I would be replacing them myself as I did with the E36 but my back says no.
     
    Last edited: Feb 9, 2018
  8. 9 Feb 2018 at 5:36 PM #8
    m3shift

    m3shift On the path

    Joined:
    Oct 24, 2015
    Messages:
    120
    Likes Received:
    0
    Trophy Points:
    0
    Your Motor:
    BMW M3 E46
    Colour Combo:
    Sliver and Red Leather
    I want to get my bushes done on car, Got a set of RTAB's,

    So I was thinking if there anything else worth replacing at the same time,

    Is it worth getting a new set of Roll bar bushes or should I just replace the whole bar as it comes with new bushes from H&R or eibach anti roll bar ?

    Any bushes that require replacing at front ? Cars just gone over 100k so thought it might be time to refresh a tad ?
     
  9. 9 Feb 2018 at 5:55 PM #9
    zeta4

    zeta4 Achieved official socks

    Joined:
    May 6, 2015
    Messages:
    1,543
    Likes Received:
    0
    Trophy Points:
    36
    Your Motor:
    2003 E46 M3, E90 330d
    Colour Combo:
    Silver Grey/Black
    Im replacing the front control arm (lollipop) bushes as well due to the mileage concern.
    The car was originally going in to have an exhaust hanger replaced but I decided to
    have the bushes done while I was at it. Ill see what the old ones look like when I get them off.

    I tried Turner ARB's (same as H&R) and while they certainly helped with the handling they
    did make the ride a bit harsher, which I didnt like even on the softest setting. My nearly worn out
    Continental M3's on 19's (and potholes!) could have been contributing though. Anyway I took them off
    and will probably try again when I change the tyres.

    When I replaced the old ARB's I replaced the bushes. The old bushes looked very tired so well worth replacing.
     
  10. 10 Feb 2018 at 11:58 AM #10
    AC427

    AC427 Achieved official socks

    Joined:
    Mar 10, 2009
    Messages:
    4,556
    Likes Received:
    0
    Trophy Points:
    36
    Your Motor:
    E46 M3 Convertible
    Colour Combo:
    Estoril / Champagne
    Apart from the price, why not get Rogue RTAB's?
     
  11. 10 Feb 2018 at 5:49 PM #11
    zeta4

    zeta4 Achieved official socks

    Joined:
    May 6, 2015
    Messages:
    1,543
    Likes Received:
    0
    Trophy Points:
    36
    Your Motor:
    2003 E46 M3, E90 330d
    Colour Combo:
    Silver Grey/Black
    Yes I agree they are a better engineering solution but I dont track the car and dont want
    any worse NVH. I might fit limiters If I dont get the improvement I expect.

    Anyway I got the oem bushes from BMW this morning and yes there are two different
    ones p/n 33326770817 is for E36 M3, E46 M3 and Z4 and p/n 33326770786 for the
    rest according to BMW. Both will fit the E46 M3 but the correct p/n is a stiffer design
    and looks different.

    The slits in the outer shell are 5mm wide in the correct M3 one and 2mm in the other.
    When the bush is inserted correctly with the slits facing up/down the extra compression
    due to the wider slits stiffens the bush in the fore and aft direction. Dont know how
    much difference it actually makes in practice but BMW did go to the trouble to specify
    them so they must have some effect

    So if anyone is about to refresh their RTAB's get the right p/n.
     
    Last edited: Feb 10, 2018
  12. 11 Feb 2018 at 5:31 PM #12
    zaharias

    zaharias Wearing official robes

    Joined:
    Sep 19, 2015
    Messages:
    443
    Likes Received:
    0
    Trophy Points:
    16
    Your Motor:
    2005 M3 E46
    Colour Combo:
    Carbon Black / Cinnamon
  13. 11 Feb 2018 at 6:04 PM #13
    AWilson9

    AWilson9 Wearing official underwear

    Joined:
    Aug 24, 2017
    Messages:
    221
    Likes Received:
    1
    Trophy Points:
    0
    Your Motor:
    E46 M3
    They revised the design so they’re easier to fit as far as I’m aware. You’ll notice the original items are solid metal all the way round, revised items have small gaps.

    I bought Meyle HD ones but ended up fitting powerflex ones, assumed they’d be a lot easier to fit but had to use the bush puller to get the black track ones in anyway!
     
  14. 11 Feb 2018 at 6:48 PM #14
    zeta4

    zeta4 Achieved official socks

    Joined:
    May 6, 2015
    Messages:
    1,543
    Likes Received:
    0
    Trophy Points:
    36
    Your Motor:
    2003 E46 M3, E90 330d
    Colour Combo:
    Silver Grey/Black
    No both of these have been in use for some time. The old ones were solid all the way round with a flange
    and had a habit of falling out. Ask me how I know.

    The gaps seem to be there to compress the rubber when they are inserted. Where the slots are the rubber
    is cut away. I should put up some pics but Im not very good at that. They need a g clamp or something to
    compress them before inserting.

    How do the Meyle ones look ?
     
  15. 11 Feb 2018 at 7:04 PM #15
    zaharias

    zaharias Wearing official robes

    Joined:
    Sep 19, 2015
    Messages:
    443
    Likes Received:
    0
    Trophy Points:
    16
    Your Motor:
    2005 M3 E46
    Colour Combo:
    Carbon Black / Cinnamon
    What do you guys think of using limiters? Limiters are for bush life?
    Oem bush + limiter for a street driven car?
    Any other bushing change while being there?
     
  16. 11 Feb 2018 at 7:23 PM #16
    E46CoupeM3

    E46CoupeM3 Achieved official socks

    Joined:
    Oct 31, 2012
    Messages:
    15,212
    Likes Received:
    4
    Trophy Points:
    38
    Your Motor:
    2001 BMW M3
    Colour Combo:
    Carbon Black
    E36 used to have the flanged RTAB too and all those are now revised to split bush too. It's nothing special or M specific.
     
  17. 12 Feb 2018 at 7:57 AM #17
    AshE46M3

    AshE46M3 Achieved official socks

    Joined:
    Feb 10, 2015
    Messages:
    2,684
    Likes Received:
    2
    Trophy Points:
    38
    Your Motor:
    Stage 1 Golf R, Mk1 Escort Cosworth, Hayabusa powered MNR Vortx

    Just to note, even if you fit powerflex black series (90 shore) polybushes you will not get increased NVH.
    I fitted these and mine drove like abrand new car afterwards with full geometry re-calibration and set up.

    The OEM RTAB solution is another design flaw (on top of the boot floor) from BMW if you ask me. They are a garbage design that cannot withstand what the application they were intended for.
     
  18. 12 Feb 2018 at 8:15 AM #18
    m3rosco

    m3rosco Achieved official socks

    Joined:
    Dec 28, 2008
    Messages:
    4,831
    Likes Received:
    1
    Trophy Points:
    38
    Your Motor:
    E46 M3 ESS VT2-525
    Colour Combo:
    phoenix yellow / black
    Totally agree. Owned my car over 10 years and from 30k miles. Now on 115k. My original RTABs were shot when I got the car, changed for oem and within another 30k they were shot again. Changed to Powerflex and they have been perfect ever since. And there is no increase in noise, vibration or harshness whatsoever. I recently replaced them at 115k as part of a rear end refurbishment that saw every nut, bolt, bush and joint replaced. Only changed them as I wanted everything to be brand new, but they were still in perfect condition.
     
  19. 13 Feb 2018 at 12:50 PM #19
    MirrorJohn

    MirrorJohn Sponsor

    Joined:
    Jul 31, 2014
    Messages:
    2,605
    Likes Received:
    0
    Trophy Points:
    36
    Your Motor:
    2005 Individual E46 M3 Coupe Manual, Honda S2000 GT, Honda CBR600RR
    Colour Combo:
    Estoril / Schwartz
    OEM RTABs + RTAB limiters for the win.

    OEM ride quality/compliance but the limiter massively increases bush life and also stops sideways flex of the bush. This improves feeling/handling.

    It's what I run on my own M3.

    I sell the Turner RTAB limiters if you decide to go down this route :thumbsup:
     
  20. 13 Feb 2018 at 4:31 PM #20
    zeta4

    zeta4 Achieved official socks

    Joined:
    May 6, 2015
    Messages:
    1,543
    Likes Received:
    0
    Trophy Points:
    36
    Your Motor:
    2003 E46 M3, E90 330d
    Colour Combo:
    Silver Grey/Black
    Cars going in on thursday for work including the RTAB's. Im using the M specific ones. It will be interesting to see what improvement I get if any.
    Ill report back. Ill probably fit limiters next. Havent decided between Turner and the Rogue ones.
     

Users Who Are Viewing This Thread (Users: 0, Guests: 1)

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice