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airbox mod results

Discussion in '4 Stroke Air Intake' started by ebockus, Dec 25, 2013.


  1. ebockus

    ebockus Pro

    Messages:
    161
    Location:
    peterborough, on
    I did the ulmer air box mod with a hauck fuel accelerator. I got the hauck for cheap so I thought I try. I was racing 2004 xc 700 clutching and exhaust mods. That machine works well surprisingly. Anyway, no mod, one or two lengths in 1000" with the mod, same day, same trail I was waving bye bye to the 700 in the mid range. He was pissed. Probably 5-7 lengths. I haven't dialed in the fuel yet. Using aem gauge. It looks like 2 green 2 yellow 3 or 2 red. It really doesn't need much fuel. I think the hauck goes to 8 and I'm using 2 or 3. Anything else fuel is below 12.5. I THINK I'm looking for 12.8 air fuel but no one wants to share yet. Anyone??????? No guessers here just people that have actually done it lol thanks. Anyway air box works, no doubt, period.
     
    twyztid likes this.
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  3. 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
    12.5 to 12.8 is the sweet spot at wide open throttle!
     
  4. ebockus

    ebockus Pro

    Messages:
    161
    Location:
    peterborough, on
    Thanks srx. I find it very difficult to monitor half throttle. Air flow ratios bounce at mid throttle. Any tricks here or just set wot and good to go
     
  5. ebockus

    ebockus Pro

    Messages:
    161
    Location:
    peterborough, on
    So I got curious to see my air fuel readings without hauck accelerator with ulmer air box mod and with exhaust mod. 2006 rtx runs right in the sweet spot 12.8 stock at bottom and WOT. No need for fuel accelerator. I thought with the exhaust and air bix done I would need it but the aem wide band gauge says its great. I added a little fuel like ulmer said on his website. So much wasted time. I should just listen to ulmer. Lesson learned
     
  6. Nytro Nasty

    Nytro Nasty Pro

    Messages:
    197
    Country:
    USA
    Snowmobile:
    2008 Yamaha FX Nytro 136, mountain fit vent kit, oft steering relocate, mountaintech skid plate, simmons flexi skiis with 6 dual runners, skinz front bumper, DDM Tuning HID lights, 55 watt ballasts with 4300k bulbs.

    All done in one season.

    That's is so far but much more on plate for this year!
    So conclusion is Ulmer airbox mod with stock fuel map and exhaust works great together and ratio is right on with no lean spots??? Did you check plugs before and after?
     
  7. ebockus

    ebockus Pro

    Messages:
    161
    Location:
    peterborough, on
    ulmer box, excell header, polaris 62 gram wieghts stock fuel map works mint. definate gains. beat a brand new polaris 800. hauck accelerator is no use to my. imo.
     
    Ohiokm likes this.

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