Intake Flapper Removal

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Intake Flapper Removal

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Intake Flapper Removal - 5/16/2005 6:01:57 PM

Chinchilla

Posts: 43
Joined: 4/28/2005
Status: offline

Hello:

I just installed a Two Bros exhaust and everything seems to be running fine. I live at 5,600 ft ASL so I think the exhaust made things just right. I am still nursing the bike though as it is new and haven't really gone above 6,000 rpm.

I have seen a lot of talk on this forum about disengaging the intake flapper when installing a new exhaust. Is this always true?

I do know on my other bikes you usually opened up both ends at the same time or atleast instlalled a KN filter. But they were all Italian V-Twins and came to the US severely restricted anyhow.

Please advise.

Post #: 1

RE: Intake Flapper Removal - 5/16/2005 10:48:37 PM

CTSmoto

Posts: 28
Joined: 5/12/2005
Status: offline

The intake flapper is a joke. As it turns out it was installed to reduce noise levels at low RPM's. At idle the bike is breathing through 2 very small holes. As the RPM's increases the flapper opens up and is fully open at or around 6000 RPMS this is where most people report a noticable increase in power. Thats because it is finally breathing like it should. The disabling of the flapper is simple. Removal is a bit more difficult.

Here is a link from Rogue Racing on how to disable or remove your flapper.

http://www.rogueracing.org/flap.htm

Hope this helps.

Mike
CTSmoto
http://cts.theallureimage.com/

(in reply to Chinchilla)

Post #: 2

RE: Intake Flapper Removal - 5/22/2005 8:39:01 AM

repsolman

Posts: 2
Joined: 5/15/2005
Status: offline

i just got a custom map made, and it still has a spot at 3500-4000 rpm's that it seams rich. if i take off the flapper will i have to get it remapped again?

(in reply to Chinchilla)

Post #: 3

RE: Intake Flapper Removal - 5/22/2005 1:48:27 PM

chainstretcher

Posts: 4556
Joined: 11/5/2004
Status: online

Removing the flapper or just disabling it will probably do the trick. Although with a custom map they should've been able to remove the richness at any rpm.

_____________________________

It's better to burn out ...
Than high side!

(in reply to repsolman)

Post #: 4

RE: Intake Flapper Removal - 5/27/2005 6:35:58 PM

RRip

Posts: 211
Joined: 5/6/2005
Status: offline

Well, I removed the vaccum hose today just to see what it was all about. As far as sound goes, I dont know if its any louder but it is... different. Did not see any performance gain. I will leave it off for a while just for the hell of it.

(in reply to chainstretcher)

Post #: 5

RE: Intake Flapper Removal - 5/27/2005 6:49:37 PM

chainstretcher

Posts: 4556
Joined: 11/5/2004
Status: online

I didn't notice any difference in sound with the flapper disabled. Performance only increased when moderately accelerating -- full power take offs were not affected. Some day when I've got the plastics off for some other reason I'll go ahead and remove all the hoses and crap but it's just not enough weight savings to make it a Saturday job all by itself. Especially when the weather is so nice

_____________________________

It's better to burn out ...
Than high side!

(in reply to RRip)

Post #: 6

RE: Intake Flapper Removal - 6/7/2005 8:49:40 AM

superbikesupply

Posts: 95
Joined: 1/7/2005
Status: offline

it will take all of 15 minutes to remove every bit of the flapper and its componets.

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keepin the shiny side up.
04 CBR 1000RR
www.superbikesupply.com
1-828-252-2280

(in reply to chainstretcher)

Post #: 7

RE: Intake Flapper Removal - 7/20/2005 8:02:49 AM

Anubis

Posts: 2159
Joined: 6/27/2005
Status: offline

Will it cause any problems with more water getting in the air intake during rainy days? Bearing in mind that i live in the uk and get alot of rain.

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Liverpool-UK

Bla Bla Bla - Just Ride It !!

(in reply to superbikesupply)

Post #: 8

RE: Intake Flapper Removal - 7/20/2005 11:07:38 AM

mmookey

Posts: 351
Joined: 7/12/2005
From: Las Vegas, NV
Status: offline

If you perform the flapper mod I recommend that you get a BMC filter street filter. I did notice that after I installed the filter that the bike responds better. If you have an aftermarket muffler like I have it is trying to exhaust as much air as it can. If the bike does not intake air to match the exhaust it does not run right. Someone also told me that after every mod to disconnect the battery for thirty minutes to reset the bike computer. This will make the bike relearn how you operate the bike with the new equipment. Hope this helps.

_____________________________

2004 Black CBR 1000RR
Two Brothers Slip-On Titanium V.A.L.E. muffler
BMC Street Air Filters
Flapper Mod
Powercommander III
Sato rearsets Type 2
CRG black shorty levers
43 teeth Driven rear sprocket
Speedo Heeler

(in reply to Anubis)

Post #: 9

RE: Intake Flapper Removal - 7/20/2005 4:59:26 PM

chainstretcher

Posts: 4556
Joined: 11/5/2004
Status: online

quote:

ORIGINAL: Anubis

Will it cause any problems with more water getting in the air intake during rainy days? Bearing in mind that i live in the uk and get alot of rain.

Shouldn't ... the flapper opens anyway. You're just making it stay open at lower rpms for better low/mid power. And I don't know nothing bout the computer on the bike learning how I ride

That's a new one on me.

_____________________________

It's better to burn out ...
Than high side!

(in reply to Anubis)

Post #: 10

RE: Intake Flapper Removal - 7/21/2005 6:41:33 AM

Anubis

Posts: 2159
Joined: 6/27/2005
Status: offline

thanks guys it`ll be done soon,

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Liverpool-UK

Bla Bla Bla - Just Ride It !!

(in reply to chainstretcher)

Post #: 11

RE: Intake Flapper Removal - 7/22/2005 12:31:47 PM

Weatherman

Posts: 37
Joined: 7/17/2005
Status: offline

Just did the mod yesterday and it made the exhaust a little throater. I found thing I noticed most was the engine noise was louder in the front end. Has anybody had any problems from doing this mod? I think I'll ride a week or two to see if I like it.
Jeff

_____________________________

Repsol 2005
Two Brothers M2 V.A.L.E Carbon Fiber
Power Commander III
Watsen Design Flush Mount Signals
Lockheart Phillips Carbon Fiber Frame Sliders
Engraved CBR RR Polished Aluminum Rear Spools
Fender Elminator
Flapper Mod

(in reply to Anubis)

Post #: 12

RE: Intake Flapper Removal - 7/22/2005 1:41:37 PM

Anubis

Posts: 2159
Joined: 6/27/2005
Status: offline

Done didnt notice any difference to b honest but i`ll give it a go, see how it is.

_____________________________

Liverpool-UK

Bla Bla Bla - Just Ride It !!

(in reply to Weatherman)

Post #: 13

RE: Intake Flapper Removal - 7/23/2005 12:58:19 AM

Whippet Goode

Posts: 128
Joined: 4/3/2005
Status: offline

quote:

ORIGINAL: Weatherman

Just did the mod yesterday and it made the exhaust a little throater. I found thing I noticed most was the engine noise was louder in the front end. Has anybody had any problems from doing this mod? I think I'll ride a week or two to see if I like it.
Jeff

I've had my '05 set up this way since APR. Yeah, I have a problem since I did this proceedure: I ride faster just to hear the induction roar. My riding buddy who owns a '04 blk RR says his hands tingle more since doing it. I think he just wanks off more these days, so that's the excuse he's using to justify his slow @$$ self.

Otherwise it gives a little pick up in mid-range.

Cheers

(in reply to Weatherman)

Post #: 14

RE: Intake Flapper Removal - 7/24/2005 11:55:17 AM

mmookey

Posts: 351
Joined: 7/12/2005
From: Las Vegas, NV
Status: offline

The only problem with the flapper mod, BMC filter and 2 Brother pipe is that I cannot hear the Gixxers, R1's or ZX 10's anymore.

_____________________________

2004 Black CBR 1000RR
Two Brothers Slip-On Titanium V.A.L.E. muffler
BMC Street Air Filters
Flapper Mod
Powercommander III
Sato rearsets Type 2
CRG black shorty levers
43 teeth Driven rear sprocket
Speedo Heeler

(in reply to Whippet Goode)

Post #: 15