BMC Air Filter vs Stock in 919 - Wrist Twisters
 
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post #1 of 23 Old 09-03-2010, 08:28 PM Thread Starter
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BMC Air Filter vs Stock in 919

I had back to back dyno runs done today at Redline in Calgary to compare BMC to OEM Honda Air Filters. The BMC makes a touch more power. It does NOT make a bunch of more power. Very interesting though, was a slight loss of torque below 5200. From 5200 up there was a bit more torque. So, my BMC does exactly what I wanted all along. I have a life time filter that actually gives a tiny bit more in the zone I'm interested in. The same likely holds true for a K&N as compared to a BMC. Bike is a 2005 with PCIII, Yosh TRCs, custom map.
There are bikes that do get messed up with non OEM filters, but the 919 is not one of them.

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post #2 of 23 Old 09-04-2010, 04:30 AM
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Let me know how the mileage goes. I experimented with filter, no filter, and a filter with the paper removed leaving only the steel mesh. They were all within 2 hp of eachother. Meaning the biggest gain was somethingg like 1.8 hp or thereabouts.

I rode around a buch with the steel mesh one but realized my fuel mileage dropped significantly. Form low 40s to high 30s! So I ditched it and put the original back in. Couldn't feel the difference but sure could notice I got my fuel mileage back.

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post #3 of 23 Old 09-04-2010, 06:47 AM Thread Starter
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Quote:
Originally Posted by touring919 View Post
Let me know how the mileage goes. I experimented with filter, no filter, and a filter with the paper removed leaving only the steel mesh. They were all within 2 hp of eachother. Meaning the biggest gain was somethingg like 1.8 hp or thereabouts.

I rode around a buch with the steel mesh one but realized my fuel mileage dropped significantly. Form low 40s to high 30s! So I ditched it and put the original back in. Couldn't feel the difference but sure could notice I got my fuel mileage back.
Interesting experience you had touring919.

I'm wondering if the air box manifold pressure is partially stabilized by the filter element, so stripping the material off and just leaving the the metal gauze could lead to pressure fluctuations that the sensor would pick up and send to the ECU. I'll bet it would be even worse in such a case if the flapper mod had also been done. (My flapper is open all the time.)

I've only checked mileage once or twice in 5 years. I was getting 40s and figured out a tankful did me the same as my ancient CB750 and stopped caring. Half my mileage nowadays is Track Days mileage, so checking mileage overall is not very meaningful in my case. With the dyno curves so close, and the same map being used, I suspect that if I did a road mileage comparison between the filters I'd find a small difference. I'll see about doing some filter swaps for road tanks of gas and report back.

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post #4 of 23 Old 09-04-2010, 06:58 AM
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I believe that LDH did a dyno test with the OEM filter and a K&N and found the OEM to be the best for horse power. Or was that with RC51?

Spoiler:

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post #5 of 23 Old 09-04-2010, 09:22 AM Thread Starter
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Quote:
Originally Posted by rickard919 View Post
I believe that LDH did a dyno test with the OEM filter and a K&N and found the OEM to be the best for horse power. Or was that with RC51?

Yes, LDH did air filter dyno testing.
That testing was all RC51 based.
The RC51 is not an common airboxed type inlet like the 919 has.
So what remains is this, some bikes can get screwed up by the use of a non OEM filter, others won't.
919s don't get screwed up.
RC51s do.

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post #6 of 23 Old 06-19-2012, 03:08 PM
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If ldh has a dyno, just show us the charts and that will end it

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post #7 of 23 Old 06-19-2012, 03:26 PM
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Just go here. Its LDH site. There is a lot of info to be found.
www.919.org

Spoiler:

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post #8 of 23 Old 06-19-2012, 03:49 PM
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I don't have dyno charts available for the 919 as I never tested the K&N on the 919. There are several members of this site & of the old motorush site though that did come forward complaining of drivability issues with their 919 usually with low rpm hiccup or lull of power at low rpm that they did not have before. All of them had a K&N filter installed. Upon removing the K&N filter their issue was solved. That was enough for me as those people had zero reason to deceive any of us and if anything they would have wanted to justify their purchase of the filters not admit to wasting money on them.

We did dyno test the K&N on the 900RR with terrible fueling results, the RC51, the 1987 GSXR750 & 600 and the 2004 1000RR. In all those cases the K&N resulted in a loss of performance somewhere in the rev range or a stutter out of the throttle response that could not be ironed out with jetting or mapping changes.

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post #9 of 23 Old 06-19-2012, 03:56 PM
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FTR, still stock. Still no problems.

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post #10 of 23 Old 06-19-2012, 03:59 PM
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For the record I am glad you had a good dyno result, but I do for the sake of thoroughness and accuracy hopoe they made multiple runs usually 3-5 runs each time with both filters until the power starts to drop off to have apples to apples comparisons.

Taking the best dyno run with one filter and the worst dyno run with the other as your comparison would not be the data we are trying to collect. I am not saying that has happened in this instance, but as a dyno operator I know how difficult it can be to obtain accurate results especially if you are in a hurry and not all the proper procedures are followed through with and the difference of a few degrees of engine temp can easily be 2-3 hp variance on the dyno.

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post #11 of 23 Old 06-19-2012, 05:55 PM
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This is just a thought which may or may not be a factor, but would being at the elevation the dyno was performed make an impact on a BMC/KN having gains? Would you see the same percentage of gains at sea level than say at +3000' (Calgary) where the air is thinner.

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post #12 of 23 Old 06-19-2012, 06:26 PM
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Good point Andrew! Are air is way thinner than yours. Remember the drop of power when we went up Mt. St. Helen's? Very different amounts of power.

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post #13 of 23 Old 06-19-2012, 07:18 PM
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All current dyno's have correction factors for ambient conditions.

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post #14 of 23 Old 06-19-2012, 07:39 PM
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LDH, you forget to take into account that butt dyno's have no way to correct for elevation. They will most definitely feel an impact in the rear.

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post #15 of 23 Old 06-19-2012, 07:41 PM
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Quote:
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LDH, you forget to take into account that butt dyno's have no way to correct for elevation. They will most definitely feel an impact in the rear.
Like yours?

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post #16 of 23 Old 06-19-2012, 08:04 PM
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Quote:
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Like yours?
After riding that 599 that sat in your gayrage for two weeks, most definitely .

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post #17 of 23 Old 06-20-2012, 04:03 AM
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back to back dyno runs...2nd run will be a tad higher ..was oem filter on the first run

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post #18 of 23 Old 03-03-2017, 07:10 AM Thread Starter
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919 BMC to OEM air filter dyno runs based comparison

Quote:
Originally Posted by mcromo44 View Post
I had back to back dyno runs done today at Redline in Calgary to compare BMC to OEM Honda Air Filters. The BMC makes a touch more power. It does NOT make a bunch of more power. Very interesting though, was a slight loss of torque below 5200. From 5200 up there was a bit more torque. So, my BMC does exactly what I wanted all along. I have a life time filter that actually gives a tiny bit more in the zone I'm interested in. The same likely holds true for a K&N as compared to a BMC. Bike is a 2005 with PCIII, Yosh TRCs, custom map.
There are bikes that do get messed up with non OEM filters, but the 919 is not one of them.
The above is a timely resurrection given a current thread that is active.

I also had dyno runs done with the side cover off and seat removed to see if that had any effect upon air entry into the airbox inlet.
After multiple runs, no detectable difference was observable.

In other words, the dyno work that day covered the comparison of two air filters, plus trying to find out if the side cover and/or seat had any effect.

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post #19 of 23 Old 02-05-2019, 01:27 PM
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Garage
Bump for @jkraft.

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post #20 of 23 Old 02-05-2019, 03:54 PM Thread Starter
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Bump for @jkraft.

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thanks for doing that!

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post #21 of 23 Old 02-09-2019, 08:27 AM
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Quote:
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thanks for doing that!

please explain

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post #22 of 23 Old 02-09-2019, 12:14 PM Thread Starter
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Quote:
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please explain
Thanking Superdog for having saved me otherwise doing it for you.
Nothing sinister.
LoL

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post #23 of 23 Old 02-09-2019, 01:54 PM
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Whew..right over my head, guess I'm getting too old for the forum stuff.


Anyway, anyone know where to get a BMC #FM299/12?

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