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2008 Nytro RTX air box mod??????

Discussion in '4 Stroke Air Intake' started by yamstock1, Sep 8, 2008.


  1. yamstock1

    yamstock1 Extreme

    Messages:
    77
    Location:
    Montreal, Quebec
    Do you have an idea what we should do on the stock air box???? I would like to know about home made modifs like a hole on the bottom of the airbox or something like that... Does anyone did mods on the airbox????
     
  2.  

  3. sheetwright

    sheetwright Just Snowmobiles Facebook Lifetime VIP Member VIP Member

    Messages:
    2,243
    Location:
    crestwood illinois
    Country:
    USA
    Snowmobile:
    2017 Yamaha Sidewinder LTX-LE
    ??

    I know there must be a post from the past on here somewhere. I just had a guy buy my stock intake box assembley off of ebay, cause he found astock box mod suggestion on this site. He was going to use mine for a back up. Did you try under the search area? Good luck :4STroke:
     
  4. yamstock1

    yamstock1 Extreme

    Messages:
    77
    Location:
    Montreal, Quebec
    Not a lot of comments.... Anyone????
     
  5. Yamaha Man

    Yamaha Man Expert

    Messages:
    357
    Location:
    AUBURN, NEW YORK
    Also wondering how mods we can do.

    I did a custom one on my Apex RTX using SLP filter paper
     
    Alsim likes this.
  6. jtermini30

    jtermini30 Newbie

    Messages:
    13
    Location:
    Fryeburg, ME
    Check out schmidt bros motorsports online webpage. You can purchase their mod or do your own.
     
  7. sheetwright

    sheetwright Just Snowmobiles Facebook Lifetime VIP Member VIP Member

    Messages:
    2,243
    Location:
    crestwood illinois
    Country:
    USA
    Snowmobile:
    2017 Yamaha Sidewinder LTX-LE
    maybe Ulmer could chime in on this. Seems like you see airbox mods, or ram air on Apex models, but mostly K&N styles on Nytro's. Any reasons??
     
  8. Srxspec

    Srxspec Ulmer Racing Advertiser Tech Advisor VIP Member

    Messages:
    5,026
    Location:
    Menno, SD
    Country:
    USA
    Snowmobile:
    2014 Yamaha SR Viper LTX, 2014 Yamaha SR Viper RTX SE, 2015 Yamaha SR Viper MTX SE 162 (turbo), 2015 Yamaha SR Viper MTX SE 153
    I wasted a day and $800 on the dyno testing air box modifications on the FX Nytro. I did not find any that worked. Some sell a modified air box lid, but use caution as I only saw losses in those style of modifications.
     
  9. yamstock1

    yamstock1 Extreme

    Messages:
    77
    Location:
    Montreal, Quebec
    Thanks SRXspec!!!!!!
    :Rockon:
     
  10. Turbor

    Turbor Pro

    Messages:
    150
    Location:
    mirabel,quebec,canada
    Country:
    Canada
    Snowmobile:
    sidewinder
    why do you want to mod the airbox on a stock nytro??? :moon: you owe me a :beer: otherwise i might link this you know where :jump:
     
  11. yamstock1

    yamstock1 Extreme

    Messages:
    77
    Location:
    Montreal, Quebec

    hahahaha Turbor.... because I had the same mods on my 2007 Apex and it worked very well... I'm wondering if the same mods is working on the Nytro.... :-o
     
  12. rlcofmn

    rlcofmn Lifetime Member Lifetime VIP Member VIP Member

    Messages:
    1,252
    Location:
    AK
    Just out of curiosity how about the Dyno tech report on the Ulmar air box mod? Yeah it may not gain peak hp but mid range is a good thing as well. I also noted the increase in fuel above 8000 but it does not show stock, is that increase needed to get the most out of the excell header?
     
  13. Srxspec

    Srxspec Ulmer Racing Advertiser Tech Advisor VIP Member

    Messages:
    5,026
    Location:
    Menno, SD
    Country:
    USA
    Snowmobile:
    2014 Yamaha SR Viper LTX, 2014 Yamaha SR Viper RTX SE, 2015 Yamaha SR Viper MTX SE 162 (turbo), 2015 Yamaha SR Viper MTX SE 153
    It gained 2 hp in the midrange and lost 2 hp on top end. The air box was also tested moving the air/fuel ratio around and didn't change the results.

    The Excell header on the dyno made the most HP with just the stock fuel map.
     
  14. rlcofmn

    rlcofmn Lifetime Member Lifetime VIP Member VIP Member

    Messages:
    1,252
    Location:
    AK
    OK I looked at the charts again and found the one I thought was most interesting is the K&N's producing 3 hp more from 8100-8200 and bringing in the peak hp 200 rpm sooner flattening out the power curve. To me that seems like a fairly big deal when it come to clutching for peak performance.

    Thanks,
    Rick
     
  15. drewseph

    drewseph Veteran

    Messages:
    27
    Location:
    Northern Alberta
    Hey guys I am new on here and need some assistance!

    I bought a new 2011 nytro rtx and had put an mbrp can on it and rode it for the first season and everything was fine. It had that good, crisp 4 stroke power.

    The next season I swapped out the 1.25 ripsaw for a 1.75 backcountry track and shortly there after I did an air box lid mod myself. At first it seemed to rip good mostly when it was cold outside(-20c), but not for long. Ever since I did these two things my sled seems more gutless and like there is power loss somewhere, even after I put a new air box lid back on. It has the same top end speed( I think), but doesn't have that raw 4 stroke jam on the bottom anymore.

    Maybe the fuel-air ratios and all out of whack still but wouldnt the sled re-adjust itself after I put the new lid back on?

    I am beginning to think I made a mistake by putting on the 1.75 track,
    but that doesn't make sense that I lose bottom end power with a more aggressive track.

    Any thoughts or ideas? HELP
     
  16. drewseph

    drewseph Veteran

    Messages:
    27
    Location:
    Northern Alberta
    So im thinking I have a clutching issue since changing out the track because the belt is also slipping, anybody have ideas I can look at?
     

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