I just took off the tank and airbox lid of my 06 and was very impressed with what I saw. The velocity stacks are pretty short as standard, as was expected with the power delivery and the shower injectors have more atomisation holes then I've ever seen.
What was interesting was what I saw when I took the filter out. There's a big plastic structure stuck onto the bottom of the filter which looks like nothing more to me then a restriction. It's making the space supplying the filter about a quarter of the size it could be. So I've got two theories on this, either its an easily removable restriction for the road bikes since an aftermarket filter is a usual replacement or its not actually restricting since its big enough to supply the air that the filter can pass through it and its there to increase air velocity of the air actually hitting the filter.
Anyone else seen this, know anything about it or have any opinions? I've taken mine out and will do some roll ons against my team mate who still has his fitted but still very interested about its purpose.
What was interesting was what I saw when I took the filter out. There's a big plastic structure stuck onto the bottom of the filter which looks like nothing more to me then a restriction. It's making the space supplying the filter about a quarter of the size it could be. So I've got two theories on this, either its an easily removable restriction for the road bikes since an aftermarket filter is a usual replacement or its not actually restricting since its big enough to supply the air that the filter can pass through it and its there to increase air velocity of the air actually hitting the filter.
Justin.
i was thinking the same thing
there is also some plastic 'air deflectors' in there which leads me to believe that the air flow has been optimized instead of just total open flow.
the plastic rivets are going to have to be replaced buy a nut and bolt to allow proper cleaning of this piece as well I reckon.
The picture doesn't show the box, it would be neatly hidden behind the filter because the filter and this box are one piece. Interesting that they orientated the filter to hide the addition.
Those air deflectors make perfect sense to me, they're taking air flow from the single small entry up front and stopping it from taking them most direct route into the centre cylinders. Instead the air flow is diverted to be equally hitting the total area of the filter and therefore equally feeding all four cylinders. The addition to the filter it would seem is undoing all the useful work these deflectors are doing and probably turning those deflectors into a hindrance as the deflectors are now turning the air supply away from the only hole supplying the filter with air. Everything about this addition would point to it being removable for racing, from Yamaha hiding its presence in the parts manual to how easy it is to break those plastic rivits.
The box could also be there for noise control purposes. I've only ever seen a more direct route for air to make it from the outside of the bike into the throttle bodies when I had my mates fully race kitted R7 open. There should be a lot of induction sound from this bike and perhaps this box is Yamaha's attempt to stop some of this sound getting back out.
Best would be to test it. Beautiful weather out, I'll stick some road kit back on the bike and give it a go, see how she feels.
I did mine before I ever rode it based on the recommendation from a friend in Europe who is helps set up top race team bikes. Apparently this is worth an instant couple of HP.
Aftermarket filters will not have this restriction so all you are doing is effectively turning the stock filter into a BMC or similar race filter.
Images show stock and modified (cut 4 plastic pins to remove restriction moulding)
I wonder if that would increase all hp or just ram air hp? I would think it would increase all the way across the rectum, uh I mean spectrum. All we need now is a dyno run......
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06 R6 here now!!!
1985 RZ350 SCREAMER!!!!
It made sense to cut it off so I did mine when I discovered to but its good to hear it from someone else. It should increase regardless of ram air velocity as when the engine is sucking its still sucking the proverbial double thick milkshake through a straw so its going to have to work harder for the same air. When the ram air is in effect its going to be stopping the air from being pushed in.
Removal is easy, there are four plastic rivets, just push a flat blade screwdriver between filter and add on box close to the offending rivet and turn it a little, the rivet pops right off.
Moral of the story, when aftermarket air filter manufacturers start quoting massive increases by only changing to their filters, don't believe it, its all trickery.
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