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Rear Diffuser Design

Posted by Atuca, Sep 5, 2012

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  1. arrowhead

    arrowhead Proven Member

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    miami, Florida

    Agree.
     

    Road Race Build 2K  0

    1998 Eagle Talon TSi
    manual · 2G DSM
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  2. Atuca

    Atuca Supporting Member

    726
    117
    Joined Jan 6, 2007
    Central Valley, California
    Mold is pulled! Looks good. A few irregularities that we are going to attribute to the fact we did this mold on MDF which kept absorbing the wax, even after 10 coats of pure carnauba wax. Maybe we could have sealed the "wood" with something else, but even through the PVA that was sprayed on top of the waxed piece, it looks like it may have absorbed the pva into the wood. But... what's done is done.

    The panel just needs to be sanded down and cleaned up and will be ready to go. :D
     

    Attached Files:

    933  2

    1997 Mitsubishi Eclipse GST
    600 whp · 500 lb/ft · 2G DSM

    2K  0

    1999 Mitsubishi Eclipse GSX
    manual · 2G DSM
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  3. Atuca

    Atuca Supporting Member

    726
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    Joined Jan 6, 2007
    Central Valley, California
    First Diffuser is finished!

    It took nearly a year and a half from inception at the start of this thread, but my idea has finally become a real thing.

    I am delivering this panel to eclipsegsx1736 (Beau) later this month to be put to the test. So far everything looks pretty darn good for this test piece and I look forward to the results.

    I think it is far from production piece, the lack of complete hardware kit and spray paint finish let you know it was made in a garage, and I am looking at some solutions. One thing to consider is the time to make one. I am not the one building the panels now and I didn't realize that while it may take an hour to do a layer of fiberglass, it takes the whole night away from my friend, so I am considering a multi-beneficial solution:

    A carbon fiber panel CNC cut. It cuts down on production time, its perfectly cut every time, its finished on both sides, and its lighter (and looks better!) It costs nearly twice the price, but I think it would be nice to have as an option.



    Anyways, that is probably more then you want to know, lets see some pictures!

    I will leave it up to Beau to get better pictures once its fully assembled, because it was pretty hard to get photos of this as it's black and without a good light source and flash, but some cell phone photos are proof its done!
     

    Attached Files:

    933  2

    1997 Mitsubishi Eclipse GST
    600 whp · 500 lb/ft · 2G DSM

    2K  0

    1999 Mitsubishi Eclipse GSX
    manual · 2G DSM
    Loading...
    Pipnorcali likes this.
  4. gixrman

    gixrman Proven Member

    1,603
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    Joined Nov 13, 2002
    Frederick, Maryland
    You need a mold and a vacuum pump. The final part needs to be as close to flawless as possible and the mold too. Plenty of you tube videos on mold making and rear diffuser mock up.
    Glad to see you followed though and didn't give up!
     

    1K  0

    1997 Mitsubishi Eclipse GSX
    · 2G DSM
    Loading...
  5. RLSchwabe

    RLSchwabe Proven Member

    44
    0
    Joined Mar 21, 2014
    Colorado Springs, Colorado
    Yeah man. Mad props from Colorado Springs. You are the prime definition of a car enthusiast. :hellyeah:
     
  6. Archer Fabrications

    Archer Fabrications Supporting Vendor

    6,174
    939
    Joined May 9, 2011
    Scottsdale, Arizona
    Wait a sec where are the vortex generator thingys?
     

    576  17

    2006 Evo 9 MR
    awd · manual · Lancer Evolution
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  7. Atuca

    Atuca Supporting Member

    726
    117
    Joined Jan 6, 2007
    Central Valley, California

    933  2

    1997 Mitsubishi Eclipse GST
    600 whp · 500 lb/ft · 2G DSM

    2K  0

    1999 Mitsubishi Eclipse GSX
    manual · 2G DSM
    Loading...
  8. AngelOfPassion

    AngelOfPassion Proven Member

    498
    0
    Joined Jul 5, 2011
    Mesa, Arizona
    Wow, can't wait to see it installed! Good job!
     

    511  0

    1997 Mitsubishi Eclipse GSX
    manual · 2G DSM
    Loading...
  9. Archer Fabrications

    Archer Fabrications Supporting Vendor

    6,174
    939
    Joined May 9, 2011
    Scottsdale, Arizona

    No i got that there was a picture of it once upon a time ago, where are they in the finished product?
     

    576  17

    2006 Evo 9 MR
    awd · manual · Lancer Evolution
    Loading...
  10. TheRaspberryKing

    TheRaspberryKing Proven Member

    12
    0
    Joined Dec 5, 2002
    Palm Springs, California
    Awesome job man, interested to see the results!
     

    1K  0

    1998 Mitsubishi Eclipse N/T
    manual · 2G DSM
    Loading...
  11. Atuca

    Atuca Supporting Member

    726
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    Joined Jan 6, 2007
    Central Valley, California
    I did some last minute work on the diffuser strakes before I deliver them to the first tester.

    I cut off one inch from the leading side of the strake, to eliminate the non-perpendicular bend that was impossible to get on the metal brake, and with a hammer I corrected it the best I can. I think the only future solution to this is two separate pieces of metal welded 90*, but that would surely be twice the cost to produce and I'm not sure if there is really a benefit to be had. Might look cleaner, but this certainly was not a bad solution.

    For those without an imagination, I taped the strakes to the diffuser panel for some last minute shots while they are with me. The first tester will be assisting me (and this thread, either directly or indirectly through me) with mounting solution for the diffuser panel to the vehicle, as well as the strakes. Once those solutions are finalized, we may see painted strakes and fully mounted and assembled pictures of the diffuser!

    The other thing to note is this first piece is being installed with a rerouted exhaust, so the panel will not be cut. The portion of the diffuser panel that extends beyond the back of the bumper may or may not be altered as well. These are all things we'll be figuring out and reporting.

    In the mean time, I'm hoping to have the second tester's diffuser done in a few weeks and with him have the diffuser installed in a standard routed exhaust and see how that affects everything. It will be pretty interesting to see!
     

    Attached Files:

    933  2

    1997 Mitsubishi Eclipse GST
    600 whp · 500 lb/ft · 2G DSM

    2K  0

    1999 Mitsubishi Eclipse GSX
    manual · 2G DSM
    Loading...
  12. NordicSaab

    NordicSaab Proven Member

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    Joined Oct 6, 2011
    Tampa, Florida
    Awesome work.

    I considered doing one of these out of aluminum but have not had time.

    Based upon the measurements, how much downforce are you expecting from the Venturi effect?
     

    Road Race Build 4K  0

    1993 Eagle Talon TSi AWD
    manual · 1G DSM
    Loading...
  13. AngelOfPassion

    AngelOfPassion Proven Member

    498
    0
    Joined Jul 5, 2011
    Mesa, Arizona
    Wow I think that is looking great! Keep us updated!
     

    511  0

    1997 Mitsubishi Eclipse GSX
    manual · 2G DSM
    Loading...
  14. Fabian

    Fabian Proven Member

    293
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    Joined Sep 5, 2008
    Elizabethtown, Pennsylvania
    so excited to see these being done, I've been searching forever to throw on my tsi fwd, although, I have to say, there is a guy I've seen on Instagram with a lime green plasti-dipped 2g eclipse from NY that has a HUGE rear diffuser on his car. I wish I could remember his name on there but if I do I'll check back in seeing that he might be able to offer some help
     

    3K  0

    1999 Mitsubishi Eclipse GST
    manual · 2G DSM

    877  0

    1995 Eagle Talon TSi
    · 2G DSM
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  15. CoachDavis

    CoachDavis Proven Member

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    Joined Mar 8, 2008
    Mesa, Arizona
    Awesome work!
     

    301  0

    1997 Mitsubishi Eclipse GSX
    manual · 2G DSM
    Loading...
  16. Atuca

    Atuca Supporting Member

    726
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    Joined Jan 6, 2007
    Central Valley, California
    I was a year behind on getting the first one out, and now the person doing the diffuser fiberglass got caught up in a big work project and a new baby on the way, putting him way behind where he and I expected on the second. I'll probably have to find someone else if we do anymore, but in the mean time I am still waiting for feedback from the first tester, but he's been busy traveling the world for AEM tuning different rally cars.

    Life, it happens.

    Appreciate the comments and kind words.
     

    933  2

    1997 Mitsubishi Eclipse GST
    600 whp · 500 lb/ft · 2G DSM

    2K  0

    1999 Mitsubishi Eclipse GSX
    manual · 2G DSM
    Loading...
  17. Atuca

    Atuca Supporting Member

    726
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    Joined Jan 6, 2007
    Central Valley, California
    First diffuser is being installed "professionally" at a composites shop now. Hopefully with that we get real feedback finally on everything from construction, to installation, to results. No exact ETA since the car also is getting some other composite work done, but hoping soon.
     

    933  2

    1997 Mitsubishi Eclipse GST
    600 whp · 500 lb/ft · 2G DSM

    2K  0

    1999 Mitsubishi Eclipse GSX
    manual · 2G DSM
    Loading...
  18. TheRaspberryKing

    TheRaspberryKing Proven Member

    12
    0
    Joined Dec 5, 2002
    Palm Springs, California
    Cool, keep us posted!
     

    1K  0

    1998 Mitsubishi Eclipse N/T
    manual · 2G DSM
    Loading...
  19. Atuca

    Atuca Supporting Member

    726
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    Joined Jan 6, 2007
    Central Valley, California
    Beau is still working on getting everything installed, but so far has some other aero done. I am patiently waiting, the same as you guys! :)

    1237799_10202820392805033_2306517421098853015_n.jpg 1606916_10202820392605028_3874872055010281612_n.jpg 10626458_10202820397205143_7769918254629616970_n.jpg
     

    933  2

    1997 Mitsubishi Eclipse GST
    600 whp · 500 lb/ft · 2G DSM

    2K  0

    1999 Mitsubishi Eclipse GSX
    manual · 2G DSM
    Loading...
    miliman13 and jjw205 like this.
  20. arrowhead

    arrowhead Proven Member

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    Joined Apr 19, 2011
    miami, Florida
    Is that your car, where did you get the canards,very nice.
     

    Road Race Build 2K  0

    1998 Eagle Talon TSi
    manual · 2G DSM
    Loading...
  21. Atuca

    Atuca Supporting Member

    726
    117
    Joined Jan 6, 2007
    Central Valley, California
    No this is the tester's car, eclipsegsx1736/Beau/BBR Tuning

    I am running the AMB Aero kit, so the diffuser can't be tested on my car, at least as designed.
     

    933  2

    1997 Mitsubishi Eclipse GST
    600 whp · 500 lb/ft · 2G DSM

    2K  0

    1999 Mitsubishi Eclipse GSX
    manual · 2G DSM
    Loading...
  22. screamineagle

    screamineagle Proven Member

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    Joined Sep 17, 2002
    Toronto,
    That looks awesome and very well done. I need to get a hold of this guy!
     
  23. cioc

    cioc Proven Member

    190
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    Joined Aug 2, 2006
    Sparta, New Jersey
    That white 2g is so badass in so many ways. Very interested in how this all pans out. Speaking of pans...anyone ever do a full undertray? It's in my future for sure.
     

    3K  0

    1992 Eagle Talon TSi AWD
    manual · 1G DSM
    Loading...
  24. KRYPYONIGHT

    KRYPYONIGHT Probationary Member

    16
    1
    Joined Jan 9, 2013
    Phoenix, Arizona
    That thing is so awesome, I would love to do a side exhaust like that.
     

    366  0

    1997 Mitsubishi Eclipse N/T
    · 2G DSM
    Loading...
  25. KeelesKustome

    KeelesKustome Proven Member

    703
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    Joined Dec 29, 2007
    Waverly, Tennessee
    diary update 5/27/2015 , previous was on page 9 over 2 years ago, and still no installed photos with any testing done. man I'm patient, still following
     

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