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All 650Rs Intake “mod”

ECHELONWARRIOR

2020
CB650R ABS
Aug 22, 2020
orlando, fl
Riding Since
2019
Figured I’d tell you guys about a nice way to get more air into your intake for free.
behind the mesh on the intake panels there is a flat plate that blocks the air flow but still lets air in. I took them off and dremeled them out to make the air flow straight through and less restrictions.
 

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miweber929

2014
CBR650F
650 Alumnus
Staff
Feb 13, 2015
Woodbury, MN
I’m pretty sure the plates are there to keep you from directly sucking water in during a rain ride and also to create a Venturi effect for the air intake. I would say they would also keep large debris from being sucked into the intake.

I‘m not 100% it will make much of a difference in running but they are not simply there to block airflow, that would be a stupid design.

I‘d say proceed with this at your own risk.
 

ECHELONWARRIOR

2020
CB650R ABS
Aug 22, 2020
orlando, fl
Riding Since
2019
not really worried about the water as i dont ride in the rain and yes i know it stops large debris from getting in but at the same time you have a good air filter for a reason. figure its worth a shot. more air more power.
 

mcphatty

2019
CB650R
Jul 5, 2020
More air does not equal more power. Your bike is programmed from the factory to accept things as they are in stock form. If you add more air, you'd likely need a tune and to adjust the fuel flow to compensate. Otherwise, you're just running lean.

And to add to miweber's comment, having the airflow disrupted by that plate may actually be by design. Stick your head in front of a leaf blower and try to breathe in with your mouth. You'll find that it's pretty difficult to catch your breath despite the rush of fresh air blasting towards your face. There's just too much airflow at once and that actually creates a pocket that pushes air away. Our air intakes probably operate similarly, and that plate could be disrupting the airflow so that it can actually breathe it in, rather than having the air pushed away by a high pressure pocket.
 
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ECHELONWARRIOR

2020
CB650R ABS
Aug 22, 2020
orlando, fl
Riding Since
2019
More air does not equal more power. Your bike is programmed from the factory to accept things as they are in stock form. If you add more air, you'd likely need a tune and to adjust the fuel flow to compensate. Otherwise, you're just running lean.

And to add to miweber's comment, having the airflow disrupted by that plate may actually be by design. Stick your head in front of a leaf blower and try to breathe in with your mouth. You'll find that it's pretty difficult to catch your breath despite the rush of fresh air blasting towards your face. There's just too much airflow at once and that actually creates a pocket that pushes air away. Our air intakes probably operate similarly, and that plate could be disrupting the airflow so that it can actually breathe it in, rather than having the air pushed away by a high pressure pocket.
to be clear i did this "mod" while on the dyno so the pcm/ecu is getting remapped to accept the extra air. i should have noted that in the first post.
 

Vilkas

2021
CBR650R ABS
Jun 14, 2021
Ireland
Riding Since
2017
More air does not equal more power. Your bike is programmed from the factory to accept things as they are in stock form. If you add more air, you'd likely need a tune and to adjust the fuel flow to compensate. Otherwise, you're just running lean.

And to add to miweber's comment, having the airflow disrupted by that plate may actually be by design. Stick your head in front of a leaf blower and try to breathe in with your mouth. You'll find that it's pretty difficult to catch your breath despite the rush of fresh air blasting towards your face. There's just too much airflow at once and that actually creates a pocket that pushes air away. Our air intakes probably operate similarly, and that plate could be disrupting the airflow so that it can actually breathe it in, rather than having the air pushed away by a high pressure pocket.
I refuse to believe that in 2021 bike's do not adjust the AFR on the go, accoreding to the factory setting. 😅
 

Brammers

2014
CBR650F ABS
Staff
May 30, 2014
Hampshire, England
They do, but the 650 series use the less complicated (read: cheaper) MAP method, rather than a MAF based one which is more accurate.

So if you can mess with airbox pressure in such a way that air flow is somehow impeded, it will impact the fuelling as the ECU's maths will be wrong.

I'm not saying the above post is correct, just that it's theoretically possible on a MAP-based FI system. A MAF sensor based system gets rid of all the guesswork.

J
 
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