reason for getting rid of the flapper valve?

trickroni · 07-29-2007, 3:24 AM

I am going to put a pc on my bike with pipes and am haveing a licensed dyno tech guy program it, but I here people reference getting rid of the flapper valve, why would this be?

HCCAFan · 07-29-2007, 7:12 PM

More Powa!

Luvfender · 07-29-2007, 7:21 PM

When you're below 3k the flap is closed restricting air intake. When you plug the hose and keep it open you'll notice the difference immediately, some disassemble the whole thing and get an air intake. The rear flap in the exhaust will go when you put the pipe on, just disco the cables from the servo motor on the left side of the bike rigth below the tank. Then you get the 15tooth front sprocket and you'll be set.

HCCAFan · 07-29-2007, 7:24 PM

Sounds better too.

Twincam · 07-29-2007, 8:07 PM

Hi sorry to bother you but im still abit weary about what it does. COuld you explain in more detail? please...?

Also, if you have time could you write an easy step by step guide of how to do it?

Im in the process,but am stuck on what to do. What will happen after i block it, will it run better/worse - richer etc?

Thanks

HCCAFan · 07-29-2007, 8:13 PM

I can't say what it does to the A/F ratio but the rumor is;
Honda claimed they out it on to add low end power'
Speculation on that was they really did it for sound/emission reasons.
General Consensus is that the butt dyno reads more power all around without it.
There is even some dyno charts around showing power added after removing/disabling it. If you need the step by step on how to do it, just use the search function. If you don't want to remove it all together it is as simple as pulling the hose off the actuator and plugging the hose with a bolt or something.

JetFxr · 07-29-2007, 11:55 PM

This should help you. LINK

HCCAFan · 07-29-2007, 11:58 PM

Quote:

Originally Posted by JetFxr

This should help you. LINK

Thanks. I'd a posted it for him but my computer crashed and the wife's laptop here doesn't have it as a favorite on it.

Twincam · 07-30-2007, 5:07 AM

Hi,

Thanks everyone.

One question lingers, if i were to take my bike back to the MOT station, would it be pulled up on it? Or wouldnt they even know to someone who is just like servicing the bike?

I will have to change my Micron can to my standard silver one as mine is not road legal, but thats life.

Anyhoos, going to jump on the blade now.

Take care

MACI4LIFE · 07-30-2007, 8:17 AM

Quote:

Originally Posted by Twincam

Hi,

Thanks everyone.

One question lingers, if i were to take my bike back to the MOT station, would it be pulled up on it? Or wouldnt they even know to someone who is just like servicing the bike?

I will have to change my Micron can to my standard silver one as mine is not road legal, but thats life.

Anyhoos, going to jump on the blade now.

Take care

me don't understanding question.

what do you mean by pulled up? ... you mean computer detecting the flapper mod, or if only a service tech would be keen enough to notice the change??

HCCAFan · 07-30-2007, 10:45 AM

If you only put a bolt or something in the hose then it would only take you a minute to take the bolt out and re-attach the flapper valve anyway. I don't know what anyone would notice or care about it though.

Phadreus · 07-30-2007, 1:43 PM

Quote:

Originally Posted by HCCAFan

I can't say what it does to the A/F ratio but the rumor is;Honda claimed they out it on to add low end power' Speculation on that was they really did it for sound/emission reasons. General consensus is that the butt dyno reads more power all around without it.
There is even some dyno charts around showing power added after removing/disabling it. If you need the step by step on how to do it, just use the search function. If you don't want to remove it all together it is as simple as pulling the hose off the actuator and plugging the hose with a bolt or something.

It seems strange to me that one can add power by restricting air flow. I could possibly see benefit to this device as it could give Honda the ability to "smooth" the power delivery some (by actually reducing power "spikes" in certain areas), but I'm not sure I would believe it adds power. This may have already been debated and hashed out somewhere, I didn't spend any time searching for it.

HCCAFan · 07-30-2007, 1:53 PM

Quote:

Originally Posted by Phadreus

It seems strange to me that one can add power by restricting air flow. I could possibly see benefit to this device as it could give Honda the ability to "smooth" the power delivery some (by actually reducing power "spikes" in certain areas), but I'm not sure I would believe it adds power. This may have already been debated and hashed out somewhere, I didn't spend any time searching for it.

Hey man, I didn't make it up! I know for a fact on a turbo car that a boost leak can give you more torque and less HP. Maybe by restricting air on a N/A bike they figured out it does the same thing. Just like you, most people didn't buy the idea and that's the reason so many disable it.

Phadreus · 07-30-2007, 2:13 PM

Quote:

Originally Posted by HCCAFan

Hey man, I didn't make it up! I know for a fact on a turbo car that a boost leak can give you more torque and less HP. Maybe by restricting air on a N/A bike they figured out it does the same thing. Just like you, most people didn't buy the idea and that's the reason so many disable it.

Easy...I'm not suggesting your making up anything, I'm suggesting the concept doesn't make sense to me, that's all. You did just hit on something that might be a clue; by restricting air volume with the flapper, you may increase air velocity which most definitely can have an impact on Torque. It would be most apparent at lower RPM's, which would also explain why it's closed at lower RPM's. Hmmm....

Cheers my friend!