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  1. #1
    ou812's Avatar
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    3" vs 4" air intake

    I know it's been talked about but the search engine pulls up every thread with the key words in it.

    I ordered 6 ft of 4" hose & have the 4" adapter on the way. Is this 4" gonna add 100 rpm or so? I'm routing it to the tube under the glove box. Will I need to make a mount bracket of some sort to make it stay in place?

    Here's what I have going on now. I used an extra XPL exhaust exit tip to keep it in place & extend it up higher in the cavity. I used an outerwear over the opening & threaded the bezel over it & it looked good but just choked the hell out of the ski, 7560 rpm! I got 8120+ after I took it off.

    Will covering the whole triangle tube opening with outerwear have the same effect?
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  2. #2
    Site Admin Green Hulk's Avatar
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    You will be shocked at the difference it's going to make.

    Ditch that front vent tube all together and stick the 4" hose close to the opening. Suspend it up some kind of way.

    100+ RPM gain easy!

  3. #3
    Water4fire's Avatar
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    Man I am sorry I forgot about the pics you wanted. So dang busy with the
    kids. Anyway here you go.

    I like 4in.
    My 1st RXP with RR high boost wheel I used 4in to the front.
    Used a 4in pipe and clamp then zip tied it in the front air vent.
    I used outterwear on the front of the seat vent for filter and to keep water out.

    And on my B-kit RXP I used 4in to the rear.
    With a UNI filter I had from a shop I bought out and uder it outter wear.
    I used a torch and a 4in round pipe to form the rear seat vent and then used black duct tape to connect the hose to the vent.

    The 4in REAR is the better one. and cost me $8 bucks in hose and a RXblast adapter $50.
    Last edited by Water4fire; 04-17-2007 at 10:53 AM.

  4. #4
    Fast & Loud meeper's Avatar
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    Quote Originally Posted by Green Hulk View Post
    You will be shocked at the difference it's going to make.

    Ditch that front vent tube all together and stick the 4" hose close to the opening. Suspend it up some kind of way.

    100+ RPM gain easy!
    thats exactly what i did, my filter with prefilter is on the closest gas tank strap to the opening.

  5. #5
    Site Admin Green Hulk's Avatar
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    Yep, thats a perfect setup Michael and very safe for surf riders. I used to run it that way until i discovered the rear air intake gave me another 100 RPM's

  6. #6
    Water4fire's Avatar
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    Well I kept the vent tube and just connected to it and used outterwear filter. It is as if you just get all fresh air.

    AND yep it is a BIG difference.

    .

  7. #7
    Fast & Loud meeper's Avatar
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    Quote Originally Posted by Green Hulk View Post
    Yep, thats a perfect setup Michael and very safe for surf riders. I used to run it that way until i discovered the rear air intake gave me another 100 RPM's
    yeah i ripped out eveything from the ski that i didnt need, i have only the foam left in there, water never drains from my ski when i am done riding anyway so i figured taking that tube out i woudl be safe for water consumption...the filer is a 6x4" airaid with a prefilter, its just like the riva 3" but larger....sounds a little quieter than the riva 3 though. maybe because i have a longer tube?

  8. #8
    xenonx's Avatar
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    James,

    The shorter the hose the better the results as per Jerry.
    You need more surface area for the fabric you are using to keep from choking. I saw an old post where someone used a round cylinder cage at the opening of the intake tube to support the outer wear sock. Try to keep it 4" at the opening as well. Looks like that ring you are using is reducing the size of the opening and causing part of your problem as well.

    You can run a cage with just the outerwear or a 4" stainless filter with outer wear. The filter or cage mounted on top of the hose should keep the hose in place. You may need a small section of 4" aluminum tubing to join the 4" tube and filter and or cage.

    You have a RXP so it would be easier for you to create a rear intake, although you would have to do some cutting at the rear for fresh air.

  9. #9
    Water4fire's Avatar
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    And with the rear intake you need to go thru hull exhaust or
    reroute your stock exhaust tube around your RR IC.


    .

  10. #10
    ou812's Avatar
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    Quote Originally Posted by Green Hulk View Post
    You will be shocked at the difference it's going to make.

    Ditch that front vent tube all together and stick the 4" hose close to the opening. Suspend it up some kind of way.

    100+ RPM gain easy!
    Give it to me baby!! I like this info!

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