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Thread: New frame

  1. #1
    Team Z8 dwz8's Avatar
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    New frame

    Over time, quite a few cars have parked in front of my house, however, this one is quite exceptional...




    220 kg, tires are a bit small, and the auxiliary frame turned out to be less than stabile.

    Whether or not this was the right thing to do, I will probably not know until a couple of years from now. For now, however, I got one as a private reserve, and I can watch in a (relatively) relaxed way, how the frames on stock will dry out...
    Best regards, Dieter

    ....

  2. #2
    Team Z8 dwz8's Avatar
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    At the end of the day, it is mainly the front section that causes headaches (at least to us).



    The strut towers are simple sheet metals pieces without any reinforcement ribs or similar, as far as I can see.



    Compared to the towers, the rest of the frame looks quite rigid.
    Best regards, Dieter

    ....

  3. #3
    Team Z8 dwz8's Avatar
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    A couple of more details:

    The towers are welded from underneath:







    Best regards, Dieter

    ....

  4. #4
    Team Z8 dwz8's Avatar
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    and the last and most important question:
    Are they flat or not?

    The first picture shows an arrow pointing to an edge. Within this circle everything is absolutely flat. The lines shown indicate roughly where the following shots were taken.











    More flat than this is impossible...
    Best regards, Dieter

    ....

  5. #5
    Team Z8 dwz8's Avatar
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    A look at the rear situation:

    There everything looks so rigid that I believe the entire back side needs to be distorted before any bulging happens.



    Best regards, Dieter

    ....

  6. #6
    Administrator thegunguy's Avatar
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    Thanks Dieter. It really is a bit "shocking" how little reinforcement there is around the strut towers.

    It would be interesting to see similar "in the raw" frames from other manufacturers/models.
    thegunguy

  7. #7

    Dieter, thanks so much for sharing those pictures.

    It gave me reason to go back and look at my own shock towers again, and I noticed that I have some curious creases in the drivers side shock tower crown. The top is as flat as yours. These creases are lower down by the front shock tower support arm, and in the light in my garage they really seemed to jump out at me today.

    I studied your shots, and it looks like your crown might also exhibit something like this, so I wondered if you could you confirm if you have any anomalies like this in your domes.

    Also does anyone else have anything like this?
     
    Andrew Macpherson

    Expert Z8 Inspections, with full support for both Z8 sale and purchases.

  8. #8
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    So, let me get this straight...

    Dieter,

    You BOUGHT a spare frame?

    Fascinating to look at. I'm no engineer but it appears to me that some sort of triangular strut brace would easily eliminate the frame torsion problem and should have been installed at the factory (like on the DB9 for instance).

    Honestly, if I was sitting on a jury for say... a class action lawsuit and I saw pictures of this frame I would immediately think (rightly or wrongly) that the front end had not been properly engineered due to the lack of strut bracing.

    Speaking of which...where's our "upgrade" (fix)?

    Jack

  9. #9
    Team Z8 KenZ8's Avatar
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    Thanks

    Thank you Dieter for these terrific photos. My car "passed" inpection as "no damage" but the tops of my towers are certainly not as flat as the unstressed frame that you present. I will present these photos when I bring the car in for the recall, and ask the regional service advisor to meet me there to compare and explain. I'll post when completed....

  10. #10
    Z8Mania
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    What kind of rims are those?!

    Nicely done Dieter- you are the xtreme.

  11. #11

    Smile

    Dieter,
    You have given us all a great pictoral reference.
    Thank you,
    Evie

  12. #12
    Team Z8 dwz8's Avatar
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    Quote Originally Posted by Jack View Post
    Dieter,
    You BOUGHT a spare frame?
    Yes. When I heard about the - unofficial and unconfirmed - number of frames left on stock, I thought it would be a good idea to save one of the original ones for later.
    I admit that I still have some trust in BMW, however, I want to have a chance to replace a frame after a damage (strut towers or real accident) instead of some repair welding going on.

    In the meantime, this frame can serve as a nice reference for everything we want to know about a "virgin" frame.

    And BTW: I hate how BMW handles this whole thing, but I WILL drive a Z8 as long as I can.
    Best regards, Dieter

    ....

  13. #13
    Z8 Ate My Homework! Norcal's Avatar
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    Yes, can't thank you enough

    Great detailed pics for sure. And the towers look woefully flimsy to the naked eye. I too would like to see how Aston did it, or others.

  14. #14
    DSC Off Orcatek's Avatar
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    Andrew,

    Looking at post #2, pic 2, there do appear to be shadows like you are showing in your pics.

    I am sure Dieter can answer for sure.

  15. #15
    Team Z8 dwz8's Avatar
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    Quote Originally Posted by macfly View Post
    It gave me reason to go back and look at my own shock towers again, and I noticed that I have some curious creases in the drivers side shock tower crown. The top is as flat as yours. These creases are lower down by the front shock tower support arm, and in the light in my garage they really seemed to jump out at me today.

    I studied your shots, and it looks like your crown might also exhibit something like this, so I wondered if you could you confirm if you have any anomalies like this in your domes.

    Also does anyone else have anything like this?
    yes, the creases are on the new frame as well. They don't look quite as deep, but I would attribute this to the fact that the new frame has no glossy color on it.
    Best regards, Dieter

    ....

  16. #16
    Z8 Madness 2112's Avatar
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    Is the guage (thickness) of the aluminum the same on both the front and rear shock/spring mounts? I would assume yes but with the rear not having the rolled edge on the opening it has the illusion of being thicker.

  17. #17
    Z8 Addict Z8doc's Avatar
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    Thanks Dieter so much !!

    Great picture reference for sure ! I too have the creases on the shock towers. I asked the FSR about them and he informed me that they are normal. Guess I will have to take his word for that.

    Dieter - regarding the frame and wood wheels -- I will keep you posted on where and when you can enter your new Soap Box Derby car here in the states!!
    Best Regards,

    Jeff
    61995 Silver /// Rot - Original Owner
    Z8 Club of Germany e.V. #102

  18. #18

    Thanks Dieter.....

    I got a several other confirmations that these exact creases are on other owner's shocktowers, so it must be something to do with the shaping/forming/welding during manufacturing rather than a later incident of any kind.

    Phew!!
    Andrew Macpherson

    Expert Z8 Inspections, with full support for both Z8 sale and purchases.

  19. #19
    Team Z8 dwz8's Avatar
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    Andrew,

    if you look at this photo here:



    This is the inside of that area. The flat bracket on the right is welded to the round tower, that's were the biggest crease is. The other ones are along the welding seams.
    Best regards, Dieter

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