Close

Results 1 to 12 of 12
  1. #1
    Join Date
    Jan 2010
    Location
    SoCal
    Posts
    140,481
    Rep Points
    42,495.7
    Mentioned
    2455 Post(s)
    Rep Power
    425


    Yes Reputation No

    SEMA 2015 - Bulletproof Automotive ditches the folding hardtop and windshield for a very unique E89 Z4

    This Z4 easily stood out at the 2015 SEMA show. The most obvious change made by Bulletproof Automotive is that the folding hardtop is gone. The car is now a dedicated roadster offering design somewhat reminiscent of a Porsche Boxster Spyder.

    Click here to enlarge

    Seeing it in person of course allows one to pick up on all the little details such as the side exit exhaust cut out from the passenger side front fenders. This changes the look of the rear as well as they go with an aggressive carbon rear diffuser without worrying about room for any exhaust pipes or tips.

    Carbon accents abound such as in the large rear wing along with the sideskirts and front diffuser. These pieces integrate well with the widebody setup which is clean and molded well. Liberty Walk bolted on pieces with gaps this is not.

    Unfortunately further details on the build were not presented with the car. It is somewhat of a shame something like this was just left in a booth without any details. How much weight did they save taking out the folding hardtop and windshield? Did they actually test the aerodynamics? Is this all just for show or is this designed to allow for wider tires and more downforce to hit the track?

    Either way it's awesome and well done inside and out with a ton of effort going into this build.

    Click here to enlarge

    Click here to enlarge

    Click here to enlarge

    Click here to enlarge

    Click here to enlarge

    Click here to enlarge

    Click here to enlarge

    Click here to enlarge

    Click here to enlarge

    Click here to enlarge

    Click here to enlarge

    #SEMA2015

  2. #2
    Join Date
    May 2011
    Location
    Louisville ky
    Posts
    734
    Rep Points
    606.8
    Mentioned
    9 Post(s)
    Rep Power
    7


    Yes Reputation No
    sooooo it looks fast, but is it all show or is there some go too?

  3. #3
    Join Date
    Jan 2010
    Location
    SoCal
    Posts
    140,481
    Rep Points
    42,495.7
    Mentioned
    2455 Post(s)
    Rep Power
    425



    Yes Reputation No
    Click here to enlarge Originally Posted by G0TB00ST? Click here to enlarge
    sooooo it looks fast, but is it all show or is there some go too?
    That's a good question I wish I had an answer to.

  4. #4
    Join Date
    Mar 2013
    Location
    Santa Barbara, CA
    Posts
    195
    Rep Points
    344.1
    Mentioned
    4 Post(s)
    Rep Power
    4


    Yes Reputation No
    At the very least it should be a fbo car, and assuming they reduced the weight significantly (hard top is about 400lbs on an e93) car should be quick around a road course. Also the side exhaust is saving quite a bit of weight

  5. #5
    Join Date
    Oct 2014
    Posts
    2,196
    Rep Points
    48.0
    Mentioned
    27 Post(s)
    Rep Power
    0


    Yes Reputation No
    Honestly...looks a little ricey to me. Sorry, but possible performance aside, I just can't get onboard with this thing.

  6. #6
    Join Date
    Aug 2012
    Location
    Hayward, CA
    Posts
    8,909
    Rep Points
    3,810.1
    Mentioned
    341 Post(s)
    Rep Power
    0


    Yes Reputation No
    Click here to enlarge Originally Posted by The Convert Click here to enlarge
    Honestly...looks a little ricey to me. Sorry, but possible performance aside, I just can't get onboard with this thing.
    Saw it in person, in my eyes is an abomination. It was the epitome of rice.

  7. #7
    Join Date
    May 2011
    Location
    Louisville ky
    Posts
    734
    Rep Points
    606.8
    Mentioned
    9 Post(s)
    Rep Power
    7


    Yes Reputation No
    Click here to enlarge Originally Posted by ope92 Click here to enlarge
    At the very least it should be a fbo car, and assuming they reduced the weight significantly (hard top is about 400lbs on an e93) car should be quick around a road course. Also the side exhaust is saving quite a bit of weight
    im sure they dropped a significant amount of weight, but that's a lot of body work. I'm sure all those panels, wings, and reinforcement probably put the weight back close to stock.
    E46 323i-rip
    e46 325ci- sold
    e85 z4-sold
    e46-m3-ripClick here to enlarge
    fj cruiser- sold
    e90 325i-sold
    e30 325i vert- sold
    e90 335i (n54)- current

  8. #8
    Join Date
    Jan 2010
    Location
    SoCal
    Posts
    140,481
    Rep Points
    42,495.7
    Mentioned
    2455 Post(s)
    Rep Power
    425



    Yes Reputation No
    Click here to enlarge Originally Posted by The Convert Click here to enlarge
    Honestly...looks a little ricey to me. Sorry, but possible performance aside, I just can't get onboard with this thing.
    I don't consider it rice the way I do some of the Liberty Walks garbage I saw.

    This actually took some creativity and skill.

    It's different but not modded in a cheap Asian style. The bodywork was perfect and the side exhaust might save some weight.

    Ditching the folding top is a smart idea to shave weight as well.

    There's definitely some major performance benefits to the choices here which by definition is not form over function.

  9. #9
    Join Date
    Oct 2014
    Posts
    2,196
    Rep Points
    48.0
    Mentioned
    27 Post(s)
    Rep Power
    0


    Yes Reputation No
    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    I don't consider it rice the way I do some of the Liberty Walks garbage I saw.

    This actually took some creativity and skill.

    It's different but not modded in a cheap Asian style. The bodywork was perfect and the side exhaust might save some weight.

    Ditching the folding top is a smart idea to shave weight as well.

    There's definitely some major performance benefits to the choices here which by definition is not form over function.
    Meh. The lack of a front windscreen would have to kill the aero and there would be no reason to have a huge wing with the airstream now being so much lower due to the lack of a roof. I just think it looks tacky and more idealized than practical aero wise.

  10. #10
    Join Date
    Jan 2010
    Location
    SoCal
    Posts
    140,481
    Rep Points
    42,495.7
    Mentioned
    2455 Post(s)
    Rep Power
    425



    Yes Reputation No
    Click here to enlarge Originally Posted by The Convert Click here to enlarge
    Meh. The lack of a front windscreen would have to kill the aero and there would be no reason to have a huge wing with the airstream now being so much lower due to the lack of a roof. I just think it looks tacky and more idealized than practical aero wise.
    It's a good question regarding the aerodynamics but I'm pointing out there are performance benefits to the mods done namely in the weight saving game.

    It's different and that's good unlike the LB stuff which is the same everywhere and offers no performance benefit.

  11. #11
    Join Date
    Oct 2014
    Posts
    2,196
    Rep Points
    48.0
    Mentioned
    27 Post(s)
    Rep Power
    0


    Yes Reputation No
    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    It's a good question regarding the aerodynamics but I'm pointing out there are performance benefits to the mods done namely in the weight saving game.

    It's different and that's good unlike the LB stuff which is the same everywhere and offers no performance benefit.
    The weight savings of the retractable hardtop is indisputably good. Reducing exhaust weight is not necessarily good in my opinion. You're reducing weight from the bottom of the car which raises the roll center slightly. For a road course car, less benefit than a strip car.

    I I don't agree that the LB kits provide no performance. They open the arches for more meat, and that is a performance upgrade.

  12. #12
    Join Date
    Jan 2010
    Location
    SoCal
    Posts
    140,481
    Rep Points
    42,495.7
    Mentioned
    2455 Post(s)
    Rep Power
    425



    Yes Reputation No
    Click here to enlarge Originally Posted by The Convert Click here to enlarge
    You're reducing weight from the bottom of the car which raises the roll center slightly. For a road course car, less benefit than a strip car.
    The center of gravity is already tremendously reduced to such a degree that the exhaust change is negligible when it comes to that.

    Click here to enlarge Originally Posted by The Convert Click here to enlarge
    They open the arches for more meat, and that is a performance upgrade.
    Seems like we see the arches opened more for 21's and not for 345's. And what is the effect on drag? To me LB is all style over substance. Is anyone really buying the kit for road racing?

Tags for this Thread

Posting Permissions

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