+-
« previous next »
Pages: [1]   Go Down

Author Topic: open air filter vs. airbox with honda filter  (Read 1021 times)

Offline

  • Trade Count: (0)
  • Green Horn
  • ***
  • Posts: 128
open air filter vs. airbox with honda filter
« on: December 21, 2014, 07:55:01 am »
Have a well ported HPR zilla with the HPR 19 pipe.  i currently use the stock airbox with the adapter plate and a honda 250r uni air filter.  I was thinking about going to an open airbox with a big air filter.  Does this make a big difference in power?  I have the bored out stock carb on it.  Looking for mainly top end as it has plenty down low for me.  Thanks. 
Logged

Share on Bluesky Share on Facebook

Offline

  • Trade Count: (0)
  • Trail Blazer
  • ******
  • Posts: 776
Re: open air filter vs. airbox with honda filter
« Reply #1 on: December 21, 2014, 06:36:56 pm »
Off topic (sorry) but where did you get your adapter for the 250r clamp on filter?
Logged

Offline

  • Trade Count: (0)
  • Forum Moderator
  • Pro Member
  • *********
  • Posts: 971
Re: open air filter vs. airbox with honda filter
« Reply #2 on: December 21, 2014, 10:53:59 pm »
definitely want to let the zilla breath, open filter and a pre filter will work well. i wouldnt run an open filter if you were going to be riding over water or mud however.
Logged
1985 Yamaha Tri Z 250
2006 Suzuki LTR 450
2011 Suzuki Hayabusa

Offline

  • CEO BRP
  • Trade Count: (0)
  • Trail Blazer
  • ******
  • Posts: 772
  • BRaP Small block 302, Released and Running
Re: open air filter vs. airbox with honda filter
« Reply #3 on: December 22, 2014, 08:10:37 am »
Shawn made them and Duncan sells just a machined plastic adaptor.
Logged

Offline

  • Trade Count: (0)
  • Elite Member
  • **********
  • Posts: 2493
  • Gender: Male
  • Location: Cincinnati OH
Re: open air filter vs. airbox with honda filter
« Reply #4 on: December 22, 2014, 01:25:40 pm »
Never ran the stock box but did run a custom box with a 9" k&n with pre-filter also ran 9" k&n with pre filter no box/open air. I did notice a slight and I mean very slight drop in throttle response and top end speed with the box vs the open air filter and I had the same size filter for both applications. I also rode mine through lots of mud and water (no river crossings or anything but wet puddles) with a water proof pre filter from outerwears and had no problems with the open air box eliminator.
Logged

Offline

  • Trade Count: (0)
  • Green Horn
  • ***
  • Posts: 128
Re: open air filter vs. airbox with honda filter
« Reply #5 on: December 22, 2014, 06:59:16 pm »
Since I can't seem to get the quad to hook up in the dirt it will mostly be used in the sand and I stay clear from mud and water so thats not an issue.   Mainly after the horsepower.   I bought the adapter plate from SBC designs on this site in the classified section. 
Logged

Offline

  • Mitch Keller
  • Trade Count: (0)
  • Administrator
  • Trail Blazer
  • *****
  • Posts: 799
  • Love The Smell Of 927 and Race Fuel In The Morning
  • Location: Riverside Ca
Re: open air filter vs. airbox with honda filter
« Reply #6 on: December 22, 2014, 11:01:01 pm »
The LT500 loves to breath. We tested with a 39 air striker & 6" K&N and then went with 41 mm & 9" K&N. We picked up over 3HP over all using Rogues Air Filter Bracket.
Logged
F Mitch Keller

Offline

  • Trade Count: (0)
  • Green Horn
  • ***
  • Posts: 101
Re: open air filter vs. airbox with honda filter
« Reply #7 on: December 23, 2014, 07:07:04 am »
Quote from: Mitch Keller on December 22, 2014, 11:01:01 pm
The LT500 loves to breath, we tested with a 39 air striker and 6" K&N and went with 41 mm and went with a 9" K&N and picked up over 3HP over all using Rouges Air Filter Bracket

Without air flow and fuel flow data. You really cant say 100% the air filter was the gain for 3hp.
With a filter switch you likely see air flow bump, and BSFC drop. If you take that BSFC with the 3hp gain and use it as a target spec. Then go back to the 6" filter and drop the BSFC (lean it) to the same spec as the 9". You will likely see that same hp gain
Logged

Offline

  • Trade Count: (0)
  • Range Rover
  • *****
  • Posts: 503
Re: open air filter vs. airbox with honda filter
« Reply #8 on: December 23, 2014, 08:05:09 am »
Bigger filter gives the ability to flow more air.
Bigger filter gives the ability to make more power.
Open filter will make more power than an air box.
Logged

Offline

  • Trade Count: (0)
  • Weekend Warrior
  • ****
  • Posts: 234
  • Gender: Male
  • Location: WI
Re: open air filter vs. airbox with honda filter
« Reply #9 on: December 23, 2014, 01:37:38 pm »
http://www.suzukiquadracerhq.com/engine-13/aem-filter-in-the-stock-air-box/msg36570/#msg36570

I like having the option to put the lid back on for an occasional wet trail ride.
360 main with the lid on 420 main with the lid off
Logged
06 Raptor 700 (EFI)
Lexx 46mm race tip
pro design air filter mod
Power Commander V

Offline

  • CEO BRP
  • Trade Count: (0)
  • Trail Blazer
  • ******
  • Posts: 772
  • BRaP Small block 302, Released and Running
Re: open air filter vs. airbox with honda filter
« Reply #10 on: December 23, 2014, 01:45:47 pm »
I was going to ask if the smaller filter was run on the larger carb. As TOYDOC suggests could be more of a air fuel ratio thing. Also depends on the airbox. 
Logged

Offline

  • Mitch Keller
  • Trade Count: (0)
  • Administrator
  • Trail Blazer
  • *****
  • Posts: 799
  • Love The Smell Of 927 and Race Fuel In The Morning
  • Location: Riverside Ca
Re: open air filter vs. airbox with honda filter
« Reply #11 on: December 23, 2014, 02:05:04 pm »
All testing was done with A?F13-14 to 1
Logged
F Mitch Keller

Offline

  • Trade Count: (0)
  • Forum Moderator
  • Elite Member
  • *********
  • Posts: 1389
  • Gender: Male
  • Location: NWA
Re: open air filter vs. airbox with honda filter
« Reply #12 on: December 23, 2014, 02:46:32 pm »
Unless you plan to mud ride, go without the airbox.
Logged

Offline

  • Trade Count: (0)
  • Green Horn
  • ***
  • Posts: 128
Re: open air filter vs. airbox with honda filter
« Reply #13 on: December 23, 2014, 07:14:32 pm »
I also was wondering if there is a noticeable power gain with the open air filter compared to running one with the air box.  Obviously jetting would have to be adjusted for each as I am sure the open filter would require richer jetting. 
Logged

Offline

  • Trade Count: (0)
  • Moderator
  • Range Rover
  • ***
  • Posts: 379
  • Gender: Male
  • Its better to burn out then fade away!
  • Location: SoCal
Re: open air filter vs. airbox with honda filter
« Reply #14 on: December 25, 2014, 10:32:17 pm »
Quote from: Mitch Keller on December 22, 2014, 11:01:01 pm
The LT500 loves to breath, we tested with a 39 air striker and 6" K&N and went with 41 mm and went with a 9" K&N and picked up over 3HP over all using Rouges Air Filter Bracket

I just wish the bracket could of panned out.  The v2 was very nice, but the fabricator(s) just made it too expensive to sell suzukiquadracerhq

Also agree that if you go to the sand the open system will gain you some power on the top end.  Good luck!
Logged

Offline

  • Trade Count: (0)
  • Green Horn
  • ***
  • Posts: 101
Re: open air filter vs. airbox with honda filter
« Reply #15 on: December 26, 2014, 06:05:48 am »
It's just my opinion, but I don't think we are making the kind of HP needed for some of BIG filters we put on.
If you crunch the numbers, sub 9000rpm, sub 90hp and a carb thats a tad over 40mm. We are over kill at 6".

To do a dyno test to really show if they like / need that size filter. You need air flow and fuel flow data. Along with two new filters, not new vs used. When you use A/F as your guide, it's after the event and a fuzzy gauge at best. With air flow you should see the gain (if it needed more area). Then your fuel flow vs power would give you BSFC. From that you go back to the 6 and verify with the same BSFC that the power was increased with the 9. That would be apples to apples.
Logged
Pages: [1]   Go Up
« previous next »
 

+- Suzuki Quadracer HQ Store Zone

http://www.suzukiquadracerhq.com/index.php?action=store