800GS Uni Filter

Discussion in 'Parallel Universe' started by SCVGS, Jul 7, 2010.

  1. SCVGS

    SCVGS Adventurer

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    I got some free dyno time today and found that the little foam plugs that Uni gives you as prefilters cost me 3.2 peak HP! Remove them and its equal to a stock filter. Drill three 1" holes in the airbox lid and gain 2.6 peak HP and the torque rises a bit below 5K RPM. YMMV:D
    #1
  2. johngil

    johngil Reseda, CA

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    Interesting.
    I wasn't crazy about the pre-filters when I put them in. I will most likely leave them in for now.
    Horsepower is the devil, right?:evil
    #2
  3. JRWooden

    JRWooden Long timer

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    So what is it about vehicle engineers that makes them design air intakes that overly restrict air flow ... some people would read your comments and wonder why BMW didn't make the snorkels another 1/2" larger in diameter or something exotic like that and pick up some free HP ... :huh

    I've had the same issue on lots of other vehicles...
    #3
  4. Too Many Toys

    Too Many Toys Adventure Poseur

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    I think OEM intake systems on bikes are a measure of performance vs. intake noise, so there is usually a slight compromise on out-right power to keep the intake noise down. Just my opinion :D
    #4
  5. MoToad

    MoToad Been here awhile

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    Can someone clue me in on this prefilter thing? I wasn't aware of anything but the main air intake filter.
    #5
  6. ebrabaek

    ebrabaek Long timer

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    They are two foam plugs that sort of pre scrub the air coming from the snorkels. Sort of like a two stage system. The air that then enters the main filter has already been filtered a little..... Drawback..... more restriction= less flow.:thumb:thumb

    Erling
    #6
  7. ebrabaek

    ebrabaek Long timer

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    Could you post the graphs please. I would like to see them...:thumb It is sad that you loose flow with the uni..... Neither uni or k&n should rob any flow....I say should.....apparently does`nt mean the y wont..... But is it surprising never the less. :thumb:thumb

    Erling
    #7
  8. 3Rrr

    3Rrr Read Ride Reflect recycle

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    Here is the link to Touratech's product page.

    :type
    #8
  9. The Griz

    The Griz Long timer

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    The Touratech one is for the R1200GS and does not fit well in the F800GS. I told a guy at TT this, and he said he'd look into it. Well it looks as though they haven't. They still list it for the F800GS. I bought it and tried to install it. The filter pods are a good inch or more too tall, making them sit and squish into the bottom of the air box. Also, you can't use those sock-style prefilters that for the R1200GS on the F800GS without cutting the snorkels. I do not advise using the TT/UNI Australia R1200GS filter on the F800GS. It is simply not designed for it. I told TT this, and they didn't listen. IMO it should not be listed for the F800GS.

    So, I sent the TT/Uni Australia filter back to TT for a refund of my $100. Next, I called up and worked directly with UNI USA (the original) in California. They built me a prototype dual pod filter specifically for the F800GS. It has shorter pods so that it fits in the airbox without being squished, and (I have to toot my own horn here) comes with two coarse foam prefilter plugs that I thought of.

    So, if you want a foam filter specifically for the F800GS, then call up UNI USA in Cali. Plus, it's $35. Not the absurd $103.20 that TT asks for the Uni Australia one that isn't even for the F800GS!

    Here is a post from the "F800GS Air Filter" thread that shows the surgery you have to do to the bike to use the pre-filters. It also shows how the TT/UNI Aus one is way too long:

    http://www.advrider.com/forums/showpost.php?p=11967517&postcount=73

    Here is my post showing the UNI USA F800GS filter:
    http://www.advrider.com/forums/showpost.php?p=12137703&postcount=159

    Here is my post installing the UNI USA F800GS filter, showing how well it fits and how you don't have to cut anything to use the pre-filters:
    http://www.advrider.com/forums/showpost.php?p=12139120&postcount=164
    #9
  10. DolphinJohn

    DolphinJohn Caveman

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    They are talking about an aftermarket foam filter brand "Uni Filter" that comes with two prefilters for the intake tubes.
    #10
  11. The Griz

    The Griz Long timer

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    #11
  12. Bartron

    Bartron 'Tenacious B' the Bike Punisher

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    Just so people don't get as confused as I did. The F800GS specific Uni Filter fits very well but the rider's right pod does make contact with a small bulge in the plastic floor of the airbox.

    Good kit at a good price.

    EDIT: By "F800GS specific Uni Filter" I am referring to the "UNI USA" F800GS filter
    #12
  13. The Griz

    The Griz Long timer

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    Actually the $35 UNI USA F800GS specific filter "touches" on the right pod ever so slightly. I mean barely touches. This is ok since it just touches and doesn't squish. Also, Roger at UNI USA in Cali said that it is as short as they could go on a pod filter anyway. That said, this is a far cry from the serious squishing you have to do to the taller $100 UNIfilter Australia R1200GS filter to get it to fit in the F800GS air box.

    The point is this:

    The Unifilter Australia filter (Unifilter Australia model NU-7305 kit) is designed for the R1200GS and HP2, not the F800GS.

    The UNI USA filter (UNI USA model NU-7308) was designed by UNI USA and I specifically for the F800GS.

    PS I just talked to someone at Touratech USA and they're going to remove the $103.20 Unifilter Australia filter that is for the R1200GS from their F800GS page. Again, it is not designed for the F800GS.

    Also, it's important to remember that Unifilter Australia and UNI USA are not the same company. They are two completely separate entities.
    #13
  14. OZZY-DUCK

    OZZY-DUCK Been here awhile

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    I have been using the Unifilter Australia kit for about 3000 klm and are very happy with it. It is actually 8mm longer than it needs to be on my kit. It does not seem to effect the bikes air filtration at all.I have never had any dust get past it nor excessive oil build up in the Airbox.
    I understand it is made for the 1200 but hey it works great on the 800. Having said that if I could get the specific UNi USA kit I would use it for sure.
    I would love to hear what documented issues you guys have had with the Unifilter Australia kit or if it is just a good excuse to complain about something else on this Thread.
    Just get out and ride and enjoy your bikes guys.
    #14
  15. raider

    raider Big red dog

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    Reading the above, there are two complaints they have:

    a) It's three times as expensive (in the USA) as the UNI-USA kit

    b) It doesn't fit as well as the UNI-USA kit

    They sound valid to me.
    #15
  16. The Griz

    The Griz Long timer

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    Not only is the Unifilter Australia R1200GS filter not designed for the F800GS, but it costs us over $100 for us to get in the US!! For a foam air filter that is simply consumer abuse/rape! If you think that we're just "complaining" then you're not paying attention to the facts:

    Unifilter Australia NU-7305 R1200GS KIT:

    1) Designed for the R1200GS, not the F800GS
    2) Too tall for the F800GS airbox. Yes, it won't effect filtration. However, why would people in the USA want to spend over $100 for a filter that you have to force fit/squish into the airbox when you can spend only $35 on a filter that is designed strictly for the F800GS and fits perfect?
    3) The Unifilter Australia R1200GS filter has more left to right play in the F800GS airbox hole than the UNI USA F800GS filter.
    4) You can't use the Unifilter Australia R1200GS kit's snorkel pre filters on the F800GS without cutting plastics on the bike.
    5) Upon inspection and comparison of the filter rubber flanges and filter media, it is my opinion that the UNI USA F800GS filter is a superior product. The UNI USA filter media seems nicer to me as well as the rubber flange on the USA filter seems made to strict F800GS airbox hole tolerances.

    I've tried and used both. This comes from experience.
    #16
  17. OZZY-DUCK

    OZZY-DUCK Been here awhile

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    Re the price, I would have thought all of us suckers that buy various items from Touratech's catalogue should be used to getting shafted for parts.:evil
    As I said in my previous post if I could get one of the UNI USA filters I would use it for sure.(Maybe I should get online and order one and give it a go)
    I was just stating the AUS unit works well and I don't think it hurts having more filter surface area on an Air cleaner!
    Also, when you say that UNI USA have made the pod filter as short as they can go, does that mean there is only just enough filter area to do the job? Just a thought.

    I totally understand the price factor but I think people shouldn't use that as the main reason for not buying something.
    If this was the case I don't think any of us would be riding a BMW thats for sure.
    #17
  18. SCVGS

    SCVGS Adventurer

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    I bought mine a month or so ago online for $42 shipped. Just do a search for the UNI USA part #.
    #18
  19. raider

    raider Big red dog

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    What do they put in the water in SA and where can I get some?

    If you think it makes sense to pay triple for a filter that doesn't fit your bike properly and isn't as well-made, feel free :lol3

    Me, I reckon even $35 is too much and am happy to swap out the OEM paper filter as required. But then, I ride alone, so I don't usually have much dust to suck in.
    #19
  20. The Griz

    The Griz Long timer

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