Who was talking about airflow?

 

After reading a few replies to my post, I was getting this sick feeling that some people are not reading the thread or just didn't care to read. Now my feeling have become a fact.

MgA_ODEN wants to know "Who was talking about airflow?"

If somebody wants to take the time to show MgA_ODEN what he said throughout this thread, be my guest. As for me, I got my answer about bike performance.

Bye....

 

a couple things to add fuel to the fire...

the flapper valve is in place to limit intake noise and to help the bike squeek by the EPA noise regulations.

You have to remember that the CBR is tuned NOT for peak performance, but to pass emissions regulations. if you REALLY think your bikes is "tuned" you need to fit a kit ECU, de smog it, and map it with a PC3USB. Then tell me where the extra 6-7hp came from.

Remove the flapper, the pair, and get that sucker mapped, stock pipe or not!

and with ANY of the EPA stuff in place, you only give up HP, torque, and performance...

Good luck!

 

, de smog it,??? whats that mean? im new to the bike world

 

The problem is that you could bolt on a fake"race only"mod that did the exact same thing as the OEM part and 99% of riders would bethrilled with the amazing performance gains. The placebo effect with any EPA defeating modcannot be understated.

I didn't actually run any tests to confirm this, but I'd bet therewouldn't bemeasurable gains in remapping just for the flapper mod. You really can't fine tune these things anyway since the ECU doesn't use the same mapfor every gear. That bugs me.

 

The problem is that you could bolt on a fake"race only"mod that did the exact same thing as the OEM part and 99% of riders would bethrilled with the amazing performance gains. The placebo effect with any EPA defeating modcannot be understated.

I didn't actually run any tests to confirm this, but I'd bet therewouldn't bemeasurable gains in remapping just for the flapper mod. You really can't fine tune these things anyway since the ECU doesn't use the same mapfor every gear. That bugs me.



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did this post agree with me or call me an idiot hahaha. i dont have my glasses on so i just skimmed over it

 

man its just a hose take it off plug it and ride the bike u didnt like it put back on .. simple and one cheap mod (actualy free) personaly i loved it brought the bike to live and made it breathe more .. sound louder thou which is good..

 

Well since I royally screwed up the quote, my post didn't deserve more than a skimming over. I fixedit, so it makes a little more sense now ... I'm certainly not calling you an idiot, but I don't share the same enthusiasm that you have for the flapper mod.In my opinion, all the raves people have about the flapper mod are 95% psychological.To many riders, any mod that makesabike noisier or pollute moreis surely going togive you a performancegain, but we know that's not necessarily true. I don'tremember the exact wording but I recall one guytalking about what an "amazing difference"the flapper mod made on his bike, and it was in an RPM range that showed no difference on the famous dyno chart. Didn't another person claim they felt a boost at like 6000 or 7000 RPM? Impossible.

The only difference I noticed when I did themod was the increased sound, I didn't notice any performance bonusand the2000-2500 RPM dead spot almost seemed to get worse. I did a fair amount of tweaking with the map, but the dip is still noticeable at part throttle. Like I mentioned in the previous post, fine tuning the map with a Power Commander is a pain since the ECU uses different mapsfor different gears.For RPM rangeswhere more than one gear may be used (3500+) you've got to findthe best compromise for all gears. For example,at 10% throttle in the 4500-5500 RPM range I noticed a 1.5 differencein AFRbetween 3rd gear and 6th gear. That scared me.

 

i think we posted this link already but the owner of www.hooliganbiketech.net shows a 2hp increase on the dyno from run 1 where the flap is hooked up to run 2 where the hose is blocked.
i always do blind tests on mods like this. i have a buddy set the bike up and not tell me the difference
then i ride the bike. bring it back he sets it up the other way. since i dont know which way the bike is set up while riding i cannot be biased. i really couldnt tell a huge difference. i did pick the flap mod ride as the one that got out of the flat spot faster. it wasnt until i was totally finished modding and custom mapped that the flat spot went away totally.

 

I'm sorry but aftera closer read of hooliganbiketech.net,we have no reason to put any faith in the dyno chart that shows the supposed HP gain. Straight from the web site-

"This flap opens above 5,600 RPMs similar to the exhaust valve"

"With the flapper mod, the bike gained over 3HP and 3 ft lbs of torque in the lower RPM ranges from 4,400 RPMs to 7,200 RPM"

7200 RPM? Do you see the problem here? The chart shows gains past 8,000 RPM, wellafter theflap was fullyopen. And why don't we see a sudden jump in the torquecurve at 5600 RPM when the flap opens? Something doesn't add up.

As forthe flat spot, a stock bikewith the flapper disabled will always have it to some degree, especially at part throttle. You can run it at any AFR you want, it ain't going away.