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 04-17-2012, 10:41 AM #12256 MisterPX Gnarly Adventurer   Joined: Aug 2011 Location: SE WI Oddometer: 143 Except that if he was going to uni filter it anyways, the K&N kinda makes up for the added uni restriction.
 04-17-2012, 11:05 AM #12257 Flying Dave Gnarly Adventurer   Joined: Feb 2006 Location: Nashville Oddometer: 139 I guess HT has finally released the guards. Good to see. Any fitment issues?
04-17-2012, 11:59 AM   #12258
helotaxi

Joined: Aug 2011
Oddometer: 380
Quote:
 Originally Posted by blacktiger 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.

04-17-2012, 01:03 PM   #12259

Joined: Mar 2008
Location: Rochester, NY
Oddometer: 59
Quote:
 Originally Posted by helotaxi 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?

04-17-2012, 01:17 PM   #12260
blacktiger
Tigers R great.

Joined: Nov 2005
Location: St.Leonards on Sea, England.
Oddometer: 3,898
Quote:
 Originally Posted by Mercury264 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.
Quote:
 Originally Posted by blacktiger 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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3 - 1 black Tigers. 955i+800XC (sold)+800XC=113000 miles of fun.

04-17-2012, 01:36 PM   #12261
fbj913
I ride

Joined: Nov 2007
Location: KC MO
Oddometer: 2,405
Quote:
 Originally Posted by Flying Dave 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!!!

04-17-2012, 03:05 PM   #12262
Mercury264
Once you go Triple...

Joined: Nov 2005
Location: Masshole
Oddometer: 22,334
Quote:
 Originally Posted by blacktiger 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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'12 Tiger 800XC
'07 TE510
'02 Sprint ST
'99 XR650L
'99 Speed Triple

04-17-2012, 04:21 PM   #12263
helotaxi

Joined: Aug 2011
Oddometer: 380
Quote:
 Originally Posted by shadygrady 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.

04-17-2012, 04:57 PM   #12264

Joined: Mar 2008
Location: Rochester, NY
Oddometer: 59
Quote:
 Originally Posted by helotaxi 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

04-17-2012, 06:00 PM   #12265
helotaxi

Joined: Aug 2011
Oddometer: 380
Quote:
 Originally Posted by shadygrady 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.

04-17-2012, 06:13 PM   #12266
Jwaki84

Joined: Aug 2011
Location: Orange County
Oddometer: 25
Quote:
 Originally Posted by blacktiger 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?

04-17-2012, 06:22 PM   #12267
marloweluke
The Flying Dutchman

Joined: Jan 2011
Location: East Kootenay
Oddometer: 149
Quote:
 Originally Posted by blacktiger 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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04-17-2012, 06:24 PM   #12268
marloweluke
The Flying Dutchman

Joined: Jan 2011
Location: East Kootenay
Oddometer: 149
Quote:
 Originally Posted by Jwaki84 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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04-17-2012, 06:26 PM   #12269
Another asshole on a KLR

Joined: Jul 2007
Location: Myrtle Beach, South Carolina
Oddometer: 367
KLIM gear

Quote:
 Originally Posted by Jwaki84 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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"Tire tracks and broken hearts, that's all we're leaving behind.
It doesn't matter what we're losing, it only matters what we're going to find!"

Meat Loaf from "A Kiss Is A Terrible Thing To Waste", Lyrics by Jim Steinman

04-17-2012, 09:05 PM   #12270
Flying Dave

Joined: Feb 2006
Location: Nashville
Oddometer: 139
Quote:
 Originally Posted by fbj913 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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