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Discussion Starter · #1 · (Edited)
MWR is well known in racing circles, but not so much with street riders, as they are not marketed heavily and they are more expensive. My experience with MWR is on my Ducati Monster, which ran a little, but noticeably, more smoothly after switching from K&N to MWR.

They now have two air filter models for the little Yamaha.

One is a 'Race Use' only filter, and requires ECU reflash or fuel management controller:
http://mwrairfilters.us/prodDetail.asp?ID=4115



The other is a 'Performance' filter that can be used as an OEM replacement. ECU reflash or fuel management controller is recommended but not required:
http://mwrairfilters.us/prodDetail.asp?ID=4114



Installed in R3 airbox:

 
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Any idea why a remap is needed? Lower restriction changes manifold air pressure (MAP) values maybe?
 

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Discussion Starter · #4 ·
Any idea why a remap is needed? Lower restriction changes manifold air pressure (MAP) values maybe?

I suppose one doesn't have to remap the fueling, but then the usefulness of a low restriction filter would be lost. To make use of the increased airflow (to increase power), the fuel delivery must also be increased, otherwise the bike will just run leaner.

BTW for those thinking about running the race filter on the streets, it may not be the best idea, because it does require more maintenance, and it can let more impurities pass through to the engine. This is not a problem on the track where bikes are tended to regularly and where mud, sand, and assorted flying road debris is minimal.
 

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MWR is well known in racing circles, but not so much with street riders, as they are not marketed heavily and they are more expensive. My experience with MWR is on my Ducati Monster, which ran a little, but noticeably, more smoothly after switching from K&N to MWR.

They now have two air filter models for the little Yamaha.

One is a 'Race Use' only filter, and requires ECU reflash or fuel management controller:
http://mwrairfilters.us/prodDetail.asp?ID=4115

After some research, I just bought one of these.

It requires more maintenance than other brands, but should provide the best results.
 

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According to Spears Racing, the MWR Racing filter for the R3 did provide the best results compared to the BMC filter.

The MWR Racing filter will filter out 100% of contaminants, but for less time compared to the Performance (Street) filter. It's recommended to clean and re-oil the Performance filter every year, while the Racing filter should be cleaned and re-oiled after every race weekend.

- Paul
 

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I tested MWR race filter vs stock and a modified stock filter. The results show the the modified stock filter is very close to the MWR race. I also tested no filter at all which proved to make the best power.

No filter isn't really a good option for long term reliability

MWR race 2nd best power but don't run it at track with fine dust and sand around. While the filter makes .3 HP from 10k to 12,8k you will reduce engine life by a fair amount

Modified stock filter is very close to the MWR race and provides excellent air filtering. To modify the stick filter simply remove the flame guard from the underside by drilling the plastic rivet heads holding it in place and reinstall the filter



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I tested MWR race filter vs stock and a modified stock filter. The results show the the modified stock filter is very close to the MWR race. I also tested no filter at all which proved to make the best power.

No filter isn't really a good option for long term reliability

MWR race 2nd best power but don't run it at track with fine dust and sand around. While the filter makes .3 HP from 10k to 12,8k you will reduce engine life by a fair amount

Modified stock filter is very close to the MWR race and provides excellent air filtering. To modify the stick filter simply remove the flame guard from the underside by drilling the plastic rivet heads holding it in place and reinstall the filter



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Hmmm. Isn't the purpose of that flame guard to keep a backfire flame from getting to the fuel system components which are right by the air filter box? Not sure I like this idea of removing it . . .

Jim G
 

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Hmmm. Isn't the purpose of that flame guard to keep a backfire flame from getting to the fuel system components which are right by the air filter box? Not sure I like this idea of removing it . . .

Jim G
If you ever had a backfire big enough to shoot flame back through the intake on anything fuel injected you've got bigger problems then worrying about melting your air filter.
 

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Hmmm. Isn't the purpose of that flame guard to keep a backfire flame from getting to the fuel system components which are right by the air filter box? Not sure I like this idea of removing it . . .

Jim G
You are correct. I wouldn't do it with a street bike. On a race bike, yes

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Hmmm. Isn't the purpose of that flame guard to keep a backfire flame from getting to the fuel system components which are right by the air filter box? Not sure I like this idea of removing it . . .

Jim G
20 yrs ago when we had carbys, yes.

Ive got the BMC but this also looks high flow.
 

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20 yrs ago when we had carbys, yes.

Ive got the BMC but this also looks high flow.
Auffit, the R3 is NOT 20 years old. It is a new design that only came out in 2015. Yamaha does not add stuff to a bike unnecessarily, especially one in a price-sensitive entry level market, because it costs money to do so. They had a REASON to provide that flame guard. We just don't know what that reason was.

Jim G
 

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Auffit, the R3 is NOT 20 years old. It is a new design that only came out in 2015. Yamaha does not add stuff to a bike unnecessarily, especially one in a price-sensitive entry level market, because it costs money to do so. They had a REASON to provide that flame guard. We just don't know what that reason was.

Jim G
Might fall under the heading "designed by lawyers". There's a lot of that these days.
Aufitt, r100 has got it. The only reason it is likely there is because it was required by DOT law. If it wasn't written in law it wouldn't be there. The US is usually the largest market for products so they are built to the US regulations.

It sometimes takes Government outfits decades to update legislation for new technologies. Flame guards are from the days of Carb'd engines.

Basically, like I said, if its fuel injected and you've got flames through the intake Id be more worried about engine damage then melting something.
 

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Might fall under the heading "designed by lawyers". There's a lot of that these days.
As a design engineer who has worked under many senior engineers who've been at it for 20+ years, I'd like to add:

"We've always done it this way."
 
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Auffit, the R3 is NOT 20 years old. It is a new design that only came out in 2015. Yamaha does not add stuff to a bike unnecessarily, especially one in a price-sensitive entry level market, because it costs money to do so. They had a REASON to provide that flame guard. We just don't know what that reason was.

Jim G

Might fall under the heading "designed by lawyers". There's a lot of that these days.
Jim,
r100 is smart,
Be like r100 ;)

Also the r3 is restriced for markets like A2 and LAMS,
power and weight,
If you cant work out which bits were thrown on to meet those targets,
Its your loss.

I could say how well the std bike the bike responds with a better flowing filter instead of conforming to strict power output, noise, & emmission targets...
But you can work that out yourself :)

Edit;
As my mate Boris tries to educate in this video
The R3 has to suffer the whining overstimulated legions of L platers who will push our bike off a cliff and expect it to survive the Holocaust..
Kids are bastards these days...

https://youtu.be/zs4yMU9dPnw
 
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