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Air box mod apex

Discussion in '4 Stroke Air Intake' started by ROCKRTX, Feb 21, 2010.


  1. ROCKRTX

    ROCKRTX TY 4 Stroke Junkie

    Messages:
    693
    Location:
    Quebec,Gatineau
    I did this air box mod 3 year ago but never see a real gain,i am thinking maybe the bottom hole is not big enough...tell me what you think.
     

    Attached Files:

  2.  

  3. ROCKRTX

    ROCKRTX TY 4 Stroke Junkie

    Messages:
    693
    Location:
    Quebec,Gatineau
    No reply so i tried something, make a bigger hole ( cut the flat bottom part ) so if its not working maybe i could duck tape to make the hole smaller.

    But now with the bigger hole the Sled bark when i crack the throttle,i also remove prefilter it was clog with oil.
     

    Attached Files:

  4. spddmon

    spddmon Lifetime Member Lifetime VIP Member VIP Member

    Messages:
    326
    Location:
    onaping lake ontario
    the reason there's no real power gain is you're pulling hot air from the eng bay it likes fresh cool air to make power, ie ram air lid or mod the top of air box with frog skin
     
  5. ROCKRTX

    ROCKRTX TY 4 Stroke Junkie

    Messages:
    693
    Location:
    Quebec,Gatineau
    For more cold air i remove the plastic piece in front yesterday.
     

    Attached Files:

  6. CANAM 4 Stroker

    CANAM 4 Stroker Pro

    Messages:
    140
    Location:
    Sylvania, OH (Warwick Ontario Snowmobile Club)
    Country:
    USA
    Snowmobile:
    2009 Yamaha Apex GT
    This mod looks alot like the Ulmer Racing mod, from what you can tell. The Ulmer airbox get great reviews.

    I have a similar cut to this, and also added drilled holes in the front of the airbox, but still under the filter foam. My thought being that it would get the cold air effect.

    Does anyone believe that you can have too much opened up ?
     
  7. Custom Rx1

    Custom Rx1 Expert

    Messages:
    267
    You could cut 2 holes in the front pan, run 2, 2" pipe to the bottom of the box.Than put a screen over the holes in the front. As you drive the air flows toward the box by the tubes. Air force induction.
     
  8. yamstock1

    yamstock1 Extreme

    Messages:
    77
    Location:
    Montreal, Quebec
    Do you know if this mod is good on Apex 2011?????
     
  9. yamahahaapex

    yamahahaapex TY 4 Stroke Master

    Messages:
    1,085
    Location:
    Yorkton Saskatchewan
    whatever you do make sure you use a pre-filter. Theres a reason why its closed, keep foreign materials out
     
  10. ROCKRTX

    ROCKRTX TY 4 Stroke Junkie

    Messages:
    693
    Location:
    Quebec,Gatineau
    Yes i did put the prefilter after
     
  11. ROCKRTX

    ROCKRTX TY 4 Stroke Junkie

    Messages:
    693
    Location:
    Quebec,Gatineau
    Similar?

    Put some pic of your air box mod.
     
  12. yamstock1

    yamstock1 Extreme

    Messages:
    77
    Location:
    Montreal, Quebec
    Do you think it is very important to have a power commander on the 2011 Apex with this air box mod????

    I've heard that the injection is very lean on the new Apex, so it would be worst with this air box mod....
     
  13. yamahahaapex

    yamahahaapex TY 4 Stroke Master

    Messages:
    1,085
    Location:
    Yorkton Saskatchewan
    They run lean in mid range and on top according to dynos and Allen himself. Im going with an airbox mod only when my pcv is in in case i notice something different
     
  14. yamstock1

    yamstock1 Extreme

    Messages:
    77
    Location:
    Montreal, Quebec
    Do you know if the Power Commander V with air box mod mapping is ready to use when we have the air box mod or if we need the autotune with it????

    I think we just have to plug it and it's ready but I just want to make sure I understand...

    Thanks!!!
     
  15. yamahahaapex

    yamahahaapex TY 4 Stroke Master

    Messages:
    1,085
    Location:
    Yorkton Saskatchewan
    check your pm
     
  16. charlie

    charlie Pro

    Messages:
    182
    Location:
    brantford ontario
    i did the same thing but i drilled 6 holes in the front of my sled and put frog skin covers over them work great and cant even realy see it looks good
     

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