I run a BMC and I read an article back in 2002 or so where they tested a K&N,, stock Honda filter and BMC. The only filter that gained over the stock filter was the BMC, I believe about 2 or 3 more HP. The BMC has the greatest surface area of the 3 which allows more air flow.. Get the BMC race not the street version. You need to have your bike mapped afterwards due the significant increase in airflow.
I run a BMC and I read an article back in 2002 or so where they tested a K&N,, stock Honda filter and BMC. The only filter that gained over the stock filter was the BMC, I believe about 2 or 3 more HP. The BMC has the greatest surface area of the 3 which allows more air flow.. Get the BMC race not the street version. You need to have your bike mapped afterwards due the significant increase in airflow.
Don't sweat it.. The street is comparable in perfromance to the stock Honda Air filter (which is an excellent filter) plus you have the added benefit of being able to reuse your BMC filter.
Thanks yellowRR for the prompt reply, good to hear it does't cause any loss in hp.
I ditch my K&N and went back to stock and felt it was much smoother, will try to test out the bmc .
Is there any long term effects of using a "race" filter on the streets? with all of the grit and crap that is out there one would wonder?
On that note has any one taken the wire mesh off of the 1000RR's stock filters? I have heard that helps with flow but have been sitting on the fence with this as I would like to know what the "educated" public thinks
Plain and simple the more air the less filtering :idunno:
Northern RR said:
Is there any long term effects of using a "race" filter on the streets? with all of the grit and crap that is out there one would wonder?
On that note has any one taken the wire mesh off of the 1000RR's stock filters? I have heard that helps with flow but have been sitting on the fence with this as I would like to know what the "educated" public thinks
Spiked - Yes, you can use the K&N cleaning products to clean the BMC.
Northern - No adverse effects to using the race filter on the street. The area is just larger which allows more airflow. I believe the filter material is still the same between the street and race.
I wouldn't recommend removing any part of the OEM filter for street use. For the track, I would remove everything BUT the steel mesh screen and then have the bike mapped accordingly.
RE the BMC, I haven't seen any real evidence that the BMC yields any more HP than the OEM unit. All I have seen is they don't lose as much as the K&N. The BMC units I observed being tested were both the street and race versions on a 03' 954 and honestly there wasn't enough difference between the two to matter (line width on the dyno graph).
I believe in the article I read only a 2-3 hp difference at most between the street and the race versions. The manuf did recommend that you have the race version filter mapped due to the increased airflow..
Abtech, the BMC's will make power on a 1krr but it is one of the few bike out there. Most bikes actually lose power. The 1k only gains an avg of 4 hp but still, if you are after every last drop of power you can get without going internal, it is a viable option. I know on the numerous 600's i've owned and the 1100xx, none of them made power with aftermarket filters, they actually lost it.
The BMC didn't lose on my 929.. it gained 2 hp.. When bike was dynoed last spring I did a before and after with the stock and race.. I will try to look for the dyno runs and if I find, I will post.
"Plain and simple the more air the less filtering"
Actually no, with more surface are the filter can flow more and still filter even better. But stock filter surface area is very good.
Actually I have been using BMC on my TL1000, also K&N with thunderace. I think it's annoying to clean them, much easier to change the stock one.
And if you gain 1hp, you may loose it at the long run. Some race teams have been running TLR:s without filter and the valve seat area gets dirty and valves start to leak, ->lost power after half race.
BMC may have that same effect, but it takes longer, maybe 50tkm?
I have heard that new suzuki's (GSX-R -2005 models) come with titanium valves. If you change the filter the engine waranty is over. Tin valves are really sensitive for dirt particles.
And bloody expensive to replace. The CRF450's have Ti valves, and they need replacing often. At least the first model out did, and the guys that bought them weren't happy when they found out the price.
On the dyno you gained 2 h.p with the bmc, what type of dyno was it, and how many runs did they do stock and then with the filter?
Only problem with this is the cost. A OEM filter for a '98 900rr is nearly $A150. Thats a shite load to fork out for a new filter every change. Ive got a Unifilter on order for my bike. Will be getting it jetted and dyno-tuned once it gets in.
yeah I know those originals can be expensive to replace. Thats why I like non-ram air bikes like 954, the filter stays cleaner for longer. Also during dusty conditions like during spring I have been using additonal filter fabric across the ram air tubes.
I have been thinking that pipercross filter could be good one. It's not so thin as BMC or K&N, it's more like motocross bike filter, Foam plastic that is oiled. similar structure works well with cross bikes, why not streetbikes.?
:idunno:
People that really concious about bike weight, will be glad to know, that BMC filter and probably pipercross is a lot lighter then stock filter, that metal screen is heavy
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