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Old 04-17-2012, 10:41 AM   #12256
MisterPX
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Except that if he was going to uni filter it anyways, the K&N kinda makes up for the added uni restriction.
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Old 04-17-2012, 11:05 AM   #12257
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I guess HT has finally released the guards. Good to see. Any fitment issues?
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Old 04-17-2012, 11:59 AM   #12258
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Speculation.
According to their respective web sites the DNA flows more air/minute than the K&N which in turn flows more than the stock filter.
My point was that if the engine draws less than either is capable of flowing, then which one CAN flow the most is moot. If the possible CFM of the filter is less than that of the engine, the engine, not the filter, is the limiting factor.

Figure 800cc x 5,000rpm (redline RPM/2 for a 4-stroke) = 4,000,000cc/m Convert that to CFM and you get 141.25cfm. According to K&N (the "more restrictive" of the two) their filter will flow 176cfm. The air filter is not the limiting factor. It is capable of flowing more air than the engine is capable of drawing at redline.

If you judge filtration efficiency by airflow alone, then both are worse than stock and neither should be considered. There's a lot more to it.
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Old 04-17-2012, 01:03 PM   #12259
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My point was that if the engine draws less than either is capable of flowing, then which one CAN flow the most is moot. If the possible CFM of the filter is less than that of the engine, the engine, not the filter, is the limiting factor.

Figure 800cc x 5,000rpm (redline RPM/2 for a 4-stroke) = 4,000,000cc/m Convert that to CFM and you get 141.25cfm. According to K&N (the "more restrictive" of the two) their filter will flow 176cfm. The air filter is not the limiting factor. It is capable of flowing more air than the engine is capable of drawing at redline.
Wouldn't the exhaust efficiency need to be factored in somehow?
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Old 04-17-2012, 01:17 PM   #12260
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To me that seems counter-intuitive - unless I'm mis-undersanding. You put on a K&N and since it's flow more air (and hence, more dirt/dust) you put on a pre-filter -do I have that right ?

If so...that doesn't make a whole lot of sense old bean
Well, firstly you need to read my post properly. I put in a DNA filter.
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Firstly I don't think you mean Keihin. Perhaps K&N??

So, at the moment your choice is, AFAIK, between K&N and DNA. I have the DNA and it's too early to tell how long it's going to last or how it's working but it's in there and nothing has broken yet.
The reasoning is that the air filter is buried under the tank and takes an hour to get at. So I put a low maintenance filter in there and put the pre-filter to take out the worst of the dirt. I never said, wrote or quoted that it was for performance. For me it's purely for ease of maintenance.
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Old 04-17-2012, 01:36 PM   #12261
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I guess HT has finally released the guards. Good to see. Any fitment issues?
Not sure if they have or not. I was able to get a prototype from them. No real fitment issues. They are a little difficult to install. You need two people. But they are very stout!!!
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Old 04-17-2012, 03:05 PM   #12262
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Originally Posted by blacktiger View Post
Well, firstly you need to read my post properly. I put in a DNA filter.


The reasoning is that the air filter is buried under the tank and takes an hour to get at. So I put a low maintenance filter in there and put the pre-filter to take out the worst of the dirt. I never said, wrote or quoted that it was for performance. For me it's purely for ease of maintenance.
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Old 04-17-2012, 04:21 PM   #12263
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Wouldn't the exhaust efficiency need to be factored in somehow?
In a perfect world you could gain a little extra effective flow from head velocity and a little precompression, but that also assumes perfect exhaust scavenge. For the filter to become the limiting factor, you're talking 20% increase in efficiency from exhaust tuning. That would be pretty impressive.
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Old 04-17-2012, 04:57 PM   #12264
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In a perfect world you could gain a little extra effective flow from head velocity and a little precompression, but that also assumes perfect exhaust scavenge. For the filter to become the limiting factor, you're talking 20% increase in efficiency from exhaust tuning. That would be pretty impressive.
Cut out the CAT and put in on the dyno
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Old 04-17-2012, 06:00 PM   #12265
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Cut out the CAT and put in on the dyno
That will increase the exhaust flow but not necessarily increase the volumetric efficiency of the engine beyond what the engine could otherwise pump.
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Old 04-17-2012, 06:13 PM   #12266
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So the next job is to unstitch that BMW roundel from your jacket sleeve and replace it with either "TRIUMPH" or ADV embroidery.
Haha, I have BMW gear for my off road riding, triumph jacket for my street riding, and currently don't own either! I think I'll stick to generic brands from now on. Anyone have experience with Klim?
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Old 04-17-2012, 06:22 PM   #12267
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Originally Posted by blacktiger View Post
Well, firstly you need to read my post properly. I put in a DNA filter.


The reasoning is that the air filter is buried under the tank and takes an hour to get at. So I put a low maintenance filter in there and put the pre-filter to take out the worst of the dirt. I never said, wrote or quoted that it was for performance. For me it's purely for ease of maintenance.
Oh boy, did I start a discussion or what? Anyway, nobody seems to dislike the DNA, although some people seem to hate the K&N. Anybody have any experience with BMC?
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Old 04-17-2012, 06:24 PM   #12268
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Haha, I have BMW gear for my off road riding, triumph jacket for my street riding, and currently don't own either! I think I'll stick to generic brands from now on. Anyone have experience with Klim?
A friend of mine has a Klim jacket and pants. So far he really likes them, but then he should for CAN$2,000. He hasn't had them very long and I don't think he wore them in a rain storm yet.
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Old 04-17-2012, 06:26 PM   #12269
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Haha, I have BMW gear for my off road riding, triumph jacket for my street riding, and currently don't own either! I think I'll stick to generic brands from now on. Anyone have experience with Klim?

I've got a Klim f4 helmet and a Klim Traverse jacket & pants. Love 'em! Great fit, great attention to detail, and they look good, too. My only issue with the Traverse suit is that it doesn't come with armor, you'll need to buy and install it. The jacket and pants have "pockets" for armor built in, but the armor isn't included.
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Old 04-17-2012, 09:05 PM   #12270
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Not sure if they have or not. I was able to get a prototype from them. No real fitment issues. They are a little difficult to install. You need two people. But they are very stout!!!
Interesting. I guess you and AV_Mech are the only two with prototypes out there. I don't have my tiger yet, but that day is getting closer. Trying to decide on options as I learn here.
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