stage 3 air box mods

Have you ever opened up a fifth or sixth gen air box? All the(fresh cool air) is coming though a tiny gap between the gas tank and frame. The snorkel pulls air from much further away from this gap(the frame is blocked off and sealed up at the bottom with foam), then say an open air box like the one shown or simply a desnorkeled deflapped air box would.

 

So you still have the snorkel and flapper and stock filter in your bike?
I can't dyno that exact lid because I have no way of getting my hands on it. But I'll post up my dyno running the following modifications:
Motad headers
Two brothers slip on
BMC air filter
Desnorkeled
Deflappered
Removed velocity stacks
Throttle body entrances rounded off to mimic velocity stacks.
All tuned on a dyno professionally with a pc3 usb

 

Here's factory



The two layed over each other.




And here's mine

 

I have since traded the BMC for a piper cross filter and put r6 velocity stacks on.
I should be getting a rapid bike 2 shortly and tuning all over again.
And of course I will post the dyno as well.

 

Does the mixture change or something in the fuel injection cause that little dip in the torque curve from 6400 to 7200 rpm?

 

That is the vtec cross over point.
It goes from 2 valves to 4 valves per cylinder at 6400 rpms.

 

The only thing that keeps me from fully buying your argument Tink is that we end users are not held to emissions standards and, depending on the end user, concerns about how longevity is affected. If they could do those things and not throw off either of those, then I like to think they would.

 

Tink we are not talking carbed bikes here.
The Honda engineers plugged up the airbox for noise regulations, plain and simple, that's it.
They run the smallest hole allowable for the engine to still run relatively efficiently.
Do I have to find the thread where the guy ran back to back runs with and with out the snorkel and flapper to appease you? It made an average of .5 hp every where , untuned. Not major power, but it did not lose power and proved that the snorkel/flapper were thrown on the box to regulate noise, and nothing else.

 

Thanks for the follow up.

 

What noise regulation do you want me to find? I don't see how that would prove anything. It would just say that the bike needs to be below a certain decibel up to half the rpm of its peak. That's why there is a flapper, to keep the induction noise down to a predetermined level, then at say 5 or 6 thousand rpms, it doesn't matter any more and then they let the engine breathe. That was the whole idea behind vtec, and why the rpm level where peak power is made was lowered on the new cbr1000 and r1 only in the us markets.

 

do we have to do this every winter? as soon as snow hits the ground, when ever anyone touches their bike, you need 4 forms of id and a notary to not think what they're doing to their bike is stupid. lets just agree to disagree.

 

I have a different perspective on it. I know very little about fuel injection systems and how to increase their performance. This kind of disagreement/discussion gives me a chance to learn new stuff.

 

Just speaking from a primarily automotive background, and messing with imports for the past 15 or so years, MAP equipped vehicles are much more forgiving in regards to intake modifications than MAF equipped cars. That being said, it wouldn't surprise me that because of this, relatively small gains are seen when messing with the airbox, because your pressure isn't really changing, and yes you can actually decrease your pressure sometimes. Short of installing a turbo/supercharger that will increase your air pressure, you're not going to see a whole lot of gains, unless you do some other supporting mods.

 

Also, regarding noise regulations...
40 CFR 205.152 subpart D, pertains to motorcycles, but that is for noise emissions. Not sure if that snorkle has much, if any, impact on the noise levels of the exhaust, but there are regulations for how loud a bike can be from the factory.