Anyone modify an airbox? - Sportbikes.net
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post #1 of 114 (permalink) Old 05-19-2006, 10:50 PM Thread Starter
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Anyone modify an airbox?

I have 1000miles on my FZ6 and luv it but seems really choked. When applying 50% or more throttle you can hear the motor trying to spool up but just never really kicks. After some investigating i found the air box is 45% smaller than the one on a R6! And the air inlet is 60% smaller! That's not even considering there is no ram air on the FZ.So I removed the top of the air box and took it out for a quick ride. What a difference. I looked up how much a new airbox top costs and it's only $9. So I am going to buy a couple and screw around modifying them until I get good power results, with good air filtration(so I won't have to clean the air filter every 1000 miles). I'll keep ya posted.
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post #2 of 114 (permalink) Old 05-26-2006, 06:37 AM
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This has been up on the board before. Here is a nice thread with pictures
http://www.yamahafz1oa.com/forum/sho...threadid=39662

I think someone copied the picture to a thread here och sportbikes to.
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post #3 of 114 (permalink) Old 05-27-2006, 10:36 PM Thread Starter
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Thanks icebreaker. I cut the airbox last night, wow what a difference.
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post #4 of 114 (permalink) Old 05-28-2006, 12:30 PM
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Since Yamaha did not do this from the factory then what are the possible drawbacks if any. Basically, do the benefits outweight the risks? And what are the risks?


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post #5 of 114 (permalink) Old 05-28-2006, 08:26 PM
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The drawback is you need a power commander to make it work.
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post #6 of 114 (permalink) Old 05-29-2006, 12:46 AM
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Quote:
Originally Posted by segue00
The drawback is you need a power commander to make it work.
I have a powercommander, and I am running the map 2 (K&N and Scorpions). Is there a different map that I would need?


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post #7 of 114 (permalink) Old 05-29-2006, 02:33 AM
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damico is dynojet certified, ask him. He might be able to help you. There is no map available for your specific combination of mods that I know of.
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post #8 of 114 (permalink) Old 05-29-2006, 07:42 AM Thread Starter
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You would probably not need a new map. Most of the maps are a smudge rich, they have to allow for so many variables.
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post #9 of 114 (permalink) Old 05-29-2006, 11:19 AM
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Quote:
Originally Posted by damico
You would probably not need a new map. Most of the maps are a smudge rich, they have to allow for so many variables.
Thanks, I'll give it a shot.


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post #10 of 114 (permalink) Old 07-10-2006, 04:59 PM
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Ok I finally did it, was pretty easy. The stock snorkle is really small and narrow. I have not been able to fully test how I like it but will report back later.


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post #11 of 114 (permalink) Old 07-11-2006, 09:25 PM
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Alright, got some good seat time so I can give my opinion on this mod.


First impression, you can hear the intake even over the Scorps. Bike does seems to have more power especially in the previously dead spot, i.e. midrange. When accelerating in first it picks the front end up 1-2 feet whereas it used to be only 1-2 inches. I could get the front end to power wheelie 1-2 feet easy but only with a certain body position, now it does it anytime. Of course, this is just my butt dyno. Kinda like changing the oil and now the front end came up! Eitherway, I recommend this mod to anyone running a powercommander. My Scorpion/K&N map ran really rich (smell test only) anyway. Definately makes a difference, took about 30 minutes (including pull the lid on the air box), and was free. Worth it IMHO.


I say it makes more power, more noticable in the 4-7 K range and at 10k plus, but take it with a grain of salt. I have no dyno evidence to support this, may be damico has had a dyno done.


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post #12 of 114 (permalink) Old 07-12-2006, 11:05 PM
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did u guys just cut the silencer off..
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post #13 of 114 (permalink) Old 07-12-2006, 11:54 PM
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Quote:
Originally Posted by TheHun
did u guys just cut the silencer off..
No not exactly, well I don't think so. I cut the airbox lid exactly like the pictures in the thread. The silence does come off, but the opening gets larger. I'll give you a picture of what I cut off, may be that will help.
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post #14 of 114 (permalink) Old 07-14-2006, 03:11 PM
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Just did it....holy crap...the sound is amaaaaaazing...music to my ears...the midrange is def. a lot smoother....
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post #15 of 114 (permalink) Old 07-14-2006, 04:57 PM
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Cool

Damico...Is your bike stock?

Here are a few thoughts from my understanding.

What would be the benefits to a stock bike here?
Would it lean or richen the motor out? I seriously doubt it.

I don't think there would be much of a performance change to a stock bike even with a low restriction filter installed. (I could be wrong however)

In an automotive application with FI, opening up the air delivery (flow) makes little difference in the A/F ratio. In computerized MFI the injectors pulse width are handled by the PCM. The Throttle body and plenum only supply air.

However....
When I looked at the airbox my immediate reaction was "WOW what restriction".

I would suspect that the bike would be louder with little power change unless there truely is excessive restriction in the OEM airbox intake. Yamaha might have done that to quiet the bike down for touring.

I know with a low restriction exhaust and a "Piggy-Back" controller (PC) installed, this is a MUST Mod!


I'm just thinking outloud.
Tell me what you think.

Bill

Last edited by Wrhinehart; 07-14-2006 at 05:25 PM.
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