BMC Race filter
02-25-2009, 09:24 AM
#2
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mikstr;
Shortly after buying my brand new VTR I installed V&H street baffle cans, bought a Dynojet kit and BMC race filter. Tried the BMC with 185f/190r jets and 180f/185r. Ran strong and seemed to pick up revs faster in the top half of the power band but ran like **** in the bottom half.
Bliping the throttle from idle in neutral it was fluffy and eratic. Would stutter and skip a beat when running below 4k rpm.
I'm guessing with larger pilot jets and a race exhaust, it might run OK down low but I didn't try 'cause 1) I noticed when holding up the BMC race filter to the light I could see through it pretty good and 2) read from Erion Racing and others that they couldn't make more power with any of the aftermarket filters.
My semi educated guess is this; If you are building a trackday/race bike with a straight through exhaust and are simply looking for more power in the top third of the power band, the BMC might work.
If you want to have a tractable streetbike not sucking in grit and dust that will last many thousands of miles, I'd skip the BMC race filter.
Shortly after buying my brand new VTR I installed V&H street baffle cans, bought a Dynojet kit and BMC race filter. Tried the BMC with 185f/190r jets and 180f/185r. Ran strong and seemed to pick up revs faster in the top half of the power band but ran like **** in the bottom half.
Bliping the throttle from idle in neutral it was fluffy and eratic. Would stutter and skip a beat when running below 4k rpm.
I'm guessing with larger pilot jets and a race exhaust, it might run OK down low but I didn't try 'cause 1) I noticed when holding up the BMC race filter to the light I could see through it pretty good and 2) read from Erion Racing and others that they couldn't make more power with any of the aftermarket filters.
My semi educated guess is this; If you are building a trackday/race bike with a straight through exhaust and are simply looking for more power in the top third of the power band, the BMC might work.
If you want to have a tractable streetbike not sucking in grit and dust that will last many thousands of miles, I'd skip the BMC race filter.
02-25-2009, 10:03 AM
#3
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thanks 
I was leaning along your line of thought. Although I do hoep to get some track days in in the future, I use my bike primarily as a street ride so I guess I'll stick with my current set-up.
cheers
I was leaning along your line of thought. Although I do hoep to get some track days in in the future, I use my bike primarily as a street ride so I guess I'll stick with my current set-up.cheers
02-25-2009, 03:37 PM
#4
JAMES
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I have one, but haven't installed it yet..
It should go well with my scorpion (race) exhaust, once i get the custom midpipes back.. I think im running stock jetting, so that is likely to be my next and hopfully last mod of this year!
It should go well with my scorpion (race) exhaust, once i get the custom midpipes back.. I think im running stock jetting, so that is likely to be my next and hopfully last mod of this year!
02-25-2009, 04:11 PM
#6
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Depends which BMC you're asking about. I'm guessing the standard BMC is comparable to the K&N though I haven't used either one.
The BMC RACE filter is minimalist, not recommended for ongoing street use. I think it flows a lot of air but does not actually filter that air near as effectively as the "street" filters.
The BMC RACE filter is minimalist, not recommended for ongoing street use. I think it flows a lot of air but does not actually filter that air near as effectively as the "street" filters.
02-25-2009, 04:24 PM
#7
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A couple more thoughts. My engine is bone stock top to bottom and I've got street baffle cans. Put that together with my belief that the race filter probably doesn't filter real good for steady street use, I gave up on it.
Looking at your list of mods and the fact that you've got a Flo Commander, the BMC race might work for you. You could dial up the mixture for track days or special occasions then reinstall the street filter and dial the mixture back down again.
If my bike had your mods I'd probably give it a try.
02-25-2009, 05:28 PM
#8
JAMES
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Oops, i didnt catch the race filter part.. I'm pretty sure mine the normal one..
Can someone tell me more about a Flo Comander please! I think that i'd rather have one of those than doing a jet kit..
Can someone tell me more about a Flo Comander please! I think that i'd rather have one of those than doing a jet kit..
02-28-2009, 06:59 AM
#9
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mikstr;
My semi educated guess is this; If you are building a trackday/race bike with a straight through exhaust and are simply looking for more power in the top third of the power band, the BMC might work.
If you want to have a tractable streetbike not sucking in grit and dust that will last many thousands of miles, I'd skip the BMC race filter.
My semi educated guess is this; If you are building a trackday/race bike with a straight through exhaust and are simply looking for more power in the top third of the power band, the BMC might work.
If you want to have a tractable streetbike not sucking in grit and dust that will last many thousands of miles, I'd skip the BMC race filter.
you may be absolutly correct, but this doesn't seem plausible to me.
thanks, nathan
02-28-2009, 04:06 PM
#10
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are you saying that foam bmc and similar oil treated filters that operate in dirty, dusty, muddy, and many adverse conditions and are being used worldwide in many and varied applications, do not work adequately? I would think that years upon years of street duty is nothing comparable to the off road conditions encountered in just one race where you're sucking everything from the bikes in front of you at maximum throttle.
you may be absolutly correct, but this doesn't seem plausible to me.
thanks, nathan
you may be absolutly correct, but this doesn't seem plausible to me.
thanks, nathan
The BMC RACE FILTER isn't foam. It's a zigzag wire mesh with a very thin layer of fiber. If you hold it up to the light you can see through it pretty good. BMC recommends it for race use only, not for sustained street use.
02-28-2009, 08:59 PM
#11
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BMC makes two different filters for the VTR and many other bikes.
The BMC RACE FILTER isn't foam. It's a zigzag wire mesh with a very thin layer of fiber. If you hold it up to the light you can see through it pretty good. BMC recommends it for race use only, not for sustained street use.
The BMC RACE FILTER isn't foam. It's a zigzag wire mesh with a very thin layer of fiber. If you hold it up to the light you can see through it pretty good. BMC recommends it for race use only, not for sustained street use.
thanks, nathan.
03-01-2009, 10:30 AM
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03-01-2009, 10:59 AM
#14
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i now have a k&n filter in my hawk and a jet kit. it runs great no stummbles down low and runs great up high. but im going to be changing to stock filter because of some recent photos ive seen of the inside of motors,running k&n filters. they are just scary.
03-01-2009, 12:35 PM
#15
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i have half length remus Ti high mounts...the jetting let me dig around for my kit i know that wrote it down and stowed it in there. it pulls hard bottom to top i'm very happy with it.
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