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Farther
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« on: July 29, 2011, 12:59:27 PM » |
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Check out this site, page down to the pictures. It is a new site for me but probably not for others on this forum. I have heard more than once that modifing the airbox was not a good idea. What is the general concensus on this? http://www.factorypro.com/prod_pages/prodh78.html |
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Thanks,
~Farther
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The Anvil
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« Reply #1 on: July 29, 2011, 01:47:50 PM » |
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Intakes, like exhausts are designed for more than just maximum flow at high RPM's. There are other issues to address. With Exhaust systems it's scavenging at low to mid RPM ranges that sees a benefit from strategic use of bends and back-pressure but as a result top end power is sacrificed. You see this on race cars and race bikes all the time. Take NASCAR for instance; short course cars will have mufflers and bends where big oval cars do not, at least that's how it used to be. In today's restrictor plate era that may have changed.
Dragsters on the other hand are WFO from line to line and use as few bends and restrictions as possible. Intakes are similar. Airboxes (as opposed to pods or wide open bellmouths) use resonance to aid in generating all around performance. By opening the airbox like that you MAY increase top end power but you're going to do so at the expense of mid range and low end power, often significantly. A buddy of mine had a GSXR1100 that he took the airbox off of and went to pods. Several jet kits and dyno hours later he wound up putting the airbox back on. It was that bad. Personally I would rather keep the power where I use it most.
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Boxer rebellion, the Holy Child. They all pay their rent.
But none together can testify to the rhythm of a road well bent.
Saddles and zip codes, passports and gates, the Jones' keep.
In August the water is trickling, in April it's furious deep.
1997 Valk Standard, Red and White.
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Hoser
Member
Posts: 5844
child of the sixties VRCC 17899
Auburn, Kansas
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« Reply #2 on: July 29, 2011, 02:14:27 PM » |
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+1 (damn, I hate to agree with this guy!)  Hoser stock bike, stock airbox  |
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I don't want a pickle, just wanna ride my motor sickle  [img width=300 height=233]http://i617.photobucket.com/albums/ |
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Chrisj CMA
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« Reply #3 on: July 29, 2011, 02:48:52 PM » |
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Before I did that, I would just remove the whole airbox system and clamp on 6 small high flow performance air cleaners directly to the carbs and see what she does. Then when it really runs bad, I would put the unmolsted airbox back on
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The Anvil
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« Reply #4 on: July 29, 2011, 02:58:43 PM » |
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Then when it really runs bad, I would put the unmolsted airbox back on
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Boxer rebellion, the Holy Child. They all pay their rent.
But none together can testify to the rhythm of a road well bent.
Saddles and zip codes, passports and gates, the Jones' keep.
In August the water is trickling, in April it's furious deep.
1997 Valk Standard, Red and White.
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Farther
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« Reply #5 on: July 29, 2011, 03:23:37 PM » |
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What about that FactoryPro jet kit CRB-H78-1.0? Would that hurt the fuel mileage?
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Thanks,
~Farther
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BlueValk
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« Reply #6 on: July 29, 2011, 03:34:23 PM » |
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Check out this site, page down to the pictures. It is a new site for me but probably not for others on this forum. I have heard more than once that modifing the airbox was not a good idea. What is the general concensus on this? http://www.factorypro.com/prod_pages/prodh78.htmlI tried my bike once with the airbox lid off. It seemed okay cruising around. Then I opened the throttle wide at about mid range rpm. That just about killed the engine to a stall. Needless to say, I put the lid back on  But, he's got about 175 jets in his. Maybe that combo would work. Wonder what his mileage is now? |
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98valk
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« Reply #7 on: July 29, 2011, 03:37:12 PM » |
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1998 Std/Tourer, 2007 DR200SE, 1981 CB900C 10speed
1973 Duster 340 4-speed rare A/C, 2001 F250 4x4 7.3L, 6sp
"Our Constitution was made only for a Moral and Religious people. It is wholly inadequate to the goverment of any other."
John Adams 10/11/1798
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Robert
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« Reply #8 on: July 29, 2011, 04:15:20 PM » |
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My airbox has the baffle out as per Factory Pro with the stage II jet kit and I really like it. I looked at all the articles that said dont do it but I wasn't happy with wide open throttle. So I put the kit in with the 110 mains and a 6 degree wheel and it pulls. Gas mileage actually improved because someone prior put in a kit with just needles and I could never really get it dialed in. I didn't try the 115 mains because It was good enough with the 110 but there is someone else that has 125 mains in. Honda did design the airbox right for the application with EPA restrictions but if you want a more full throttle go then do the mod with the jets.
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“Some people see things that are and ask, Why? Some people dream of things that never were and ask, Why not? Some people have to go to work and don’t have time for all that.”
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