Tailgate up or down

Discussion in 'Performance & Fuel' started by blacksilverado07, Jan 16, 2008.

  1. Sooner

    Sooner Rockstar

    Hey! I'm looking to replace my 08 Tahoe stock rims with aftermarket. Let me know. Maybe we can do some wheeling and dealing. :money:

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    Last edited: Apr 5, 2008
  2. blacksilverado07

    blacksilverado07 Rockstar

    i wanna keep mine though but if u would sell them tell me a price
  3. GoFastPadre

    GoFastPadre Rockstar 100 Posts

    The guys who are telling you to keep it up are right!! It does create a vortex similar to a twister which eliminates the drag. Check out the MYTHBUSTERS on the DISC Ch!!

    H.A. REDNECK New Member

    up or down

    myth busters did a test both ways . tail gate up won. creating a vortec thing was right.
  5. CarpenterGuy

    CarpenterGuy Epic Member 5+ Years 500 Posts

    let it down. there's less wind resistance with it down so i would assume it wouldn't hold the truck back as much. but that just rounds off a small part of the brick :)
  6. CarpenterGuy

    CarpenterGuy Epic Member 5+ Years 500 Posts

    They re-tested it because of veiwer complaints and it turned out that tailgate down was more efficient.
  7. Sooner

    Sooner Rockstar

    I must've missed that episode. When did you see that? I found that they revisited the tailgate down theory (http://kwc.org/mythbusters/2006/12/episode_64_more_myths_revisite.html) but only because the viewers suggested they test one with a hard bed cover, a mesh tailgate and one with the tailgate removed altogether. The tailgate up was proven again more efficient then tailgate down. Either way, you can't dispute wind tunnel testing (see http://www.nrc-cnrc.gc.ca/highlights/2007/0705uplands_e.html) and the test proved there was more drag with the tailgate down.
    Last edited: Sep 22, 2008
  8. Z71_usmc_rebel

    Z71_usmc_rebel Rockstar ROTM Winner 100 Posts

    when u have the tailgate down, the air that comes over the cab pushes down the bed of the truck causing you to lose MPG...but with the tailgate up like said before it causes some vortex or wind tunnel in the bed of your truck and actually pushes your truck.
  9. smpoulin1

    smpoulin1 Member

    I don't know if lowering the tailgate will help, but removing any excess weight will help. Do you know if the other truck is completley stock?
  10. 4x4_only

    4x4_only Member

    Has anyone actually tried it both ways with the tailgate up and the tailgate down. DRiving my normal style and got just a hair less on MPG with my 07 Z71. I normally get about 13.5 with the tailgate up and I got about 13.2 with the tailgate down.

    Regardless, If you're losing by two truck lengths you're going to need to do something more significant than lowering you're tailgate or taking the tailgate off.

    Besides, are you sure his truck is stock or "stock"? Has he had different gears or maybe even a hypertech programmer without you knowing? There's too many variables to pinpoint why you're getting beat...and no its not the tailgate.

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